Abstract:
A power transformation system having a power stealing mode for powering a device indirectly through an electrical load connected to a power source and also has a characterization mode. The transfer of energy from the power source via the load may go undetected. The system may store energy from the load in an ultra or super capacitor. This energy may be used to power Wi-Fi and various thermostat applications, among other things, associated with HVAC and building automation and management systems. Energy from the load may be supplemented or substituted with energy from a battery and/or a buck converter. In the characterization mode, the system may obtain data relative to power usage of a load and determine a profile to identify one or more components and their operating conditions.

Description:
[0001]    This application is a continuation-in-part of U.S. application Ser. No. 14/300,228, filed in Jun. 9, 2014, and entitled “A Power Transformation System”, which claims the claims the benefit of U.S. Provisional Application Ser. No. 61/841,191, filed Jun. 28, 2013, and entitled “A Power Transformation System”. U.S. application Ser. No. 14/300,228, filed in Jun. 9, 2014, is hereby incorporated by reference. U.S. Provisional Application Ser. No. 61/841,191, filed Jun. 28, 2013, is hereby incorporated by reference. 
         [0002]    This application is a continuation-in-part of U.S. application Ser. No. 14/300,232, filed in Jun. 9, 2014, and entitled “A Power Transformation System with Characterization”, which claims the claims the benefit of U.S. Provisional Application Ser. No. 61/841,191, filed Jun. 28, 2013, and entitled “A Power Transformation System”. U.S. application Ser. No. 14/300,232, filed in Jun. 9, 2014, is hereby incorporated by reference. U.S. Provisional Application Ser. No. 61/841,191, filed Jun. 28, 2013, is hereby incorporated by reference. 
         [0003]    This application claims the benefit of U.S. Provisional Application 61/899,427, filed Nov. 4, 2013, and entitled “Methods and Systems for Providing Improved Service for Building Control Systems”. U.S. Provisional Application Ser. No. 61/899,427, filed Nov. 4, 2013, is hereby incorporated by reference. 
       RELATED APPLICATION 
       [0004]    U.S. application Ser. No. 13/227,395, filed Sep. 7, 2011, and entitled “HVAC Controller including User Interaction Log”, is hereby incorporated by reference. 
     
    
     BACKGROUND 
       [0005]    The present disclosure pertains to power supplies for devices and particularly to taking power from the supplies for other devices. The disclosure also pertains to characterization of loads. 
       SUMMARY 
       [0006]    The disclosure reveals a power transformation system having a power stealing mode for powering a device indirectly through an electrical load connected to a power source and also has a characterization mode. The transfer of energy from the power source via the load may go undetected. The system may store energy from the load in an ultra or super capacitor. This energy may be used to power Wi-Fi and various thermostat applications, among other things, associated with HVAC and building automation and management systems. Energy from the load may be supplemented or substituted with energy from a battery and/or a buck converter. In the characterization mode, the system may obtain data relative to power usage of a load and determine a profile to identify one or more components and their operating conditions. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
         [0007]      FIG. 1   a  is a diagram of a power transformation circuit; 
           [0008]      FIG. 1   b  is a diagram of the power transformation circuit having a different buck converter and battery connection; 
           [0009]      FIG. 1   c  is a diagram of another version of the power transformation circuit showing a single channel; 
           [0010]      FIG. 1   d  is a diagram of example loads connected to outputs of the power transformation circuit; 
           [0011]      FIG. 2  is a diagram of a waveform indicating an inductive load; 
           [0012]      FIG. 3  is a diagram of a waveform indicating a resistive load; 
           [0013]      FIGS. 4 and 5  are schematic diagrams of current sources; 
           [0014]      FIGS. 6   a ,  6   b  and  6   c  are diagrams of waveforms of various aspects of the power transformation circuit; and 
           [0015]      FIGS. 7   a ,  7   b ,  7   c ,  7   d ,  7   e ,  7   f  and  7   g  are diagrams of activities of certain portions of the power transformation circuits in  FIGS. 1   a - 1   c ; and 
           [0016]      FIGS. 8   a ,  8   b ,  9   a - 9   c ,  10   a - 10   c ,  11   a - 11   c  and  12   a - 12   b  are schematics of an illustrative example of the present power transformation circuit 
           [0017]      FIG. 13  is a diagram of combinations of capacities and sources; 
           [0018]      FIG. 14  is a diagram of a state overview; 
           [0019]      FIG. 15  is a flow diagram of a characterization; 
           [0020]      FIG. 16  is a flow diagram of an already characterized situation; 
           [0021]      FIG. 17  is a diagram of a graph showing s fixture&#39;s process when it is in an off state, when a thermostat&#39;s call for heat, and when the call for heat is satisfied; 
           [0022]      FIG. 18  is a diagram of a graph where a fixture&#39;s process when it is in an off state, when the thermostat call for heat, and when the flame sense is not turned on; 
           [0023]      FIG. 19  is a diagram of a graph showing an area of purge, an igniter, a gas valve on, and a hold of the gas valve; 
           [0024]      FIG. 20  is a diagram of a graph of a power steal, an activity of a wax motor valve operation; 
           [0025]      FIG. 21  is a diagram of a graph of an AC version of a waveform with certain events indicated along the waveform; and 
           [0026]      FIG. 22  is a diagram of a graph of a magnified portion of an AC version showing a signal&#39;s shape. 
       
    
    
     DESCRIPTION 
       [0027]    The present system and approach may incorporate one or more processors, computers, controllers, user interfaces, wireless and/or wire connections, and/or the like, in an implementation described and/or shown herein. 
         [0028]    This description may provide one or more illustrative and specific examples or ways of implementing the present system and approach. There may be numerous other examples or ways of implementing the system and approach. 
         [0029]    A powering of devices not connected directly to a power source return except through electrical loads may be regarded as a power transformation (PT) system. The present power transformation system may have advantages over systems having ordinary or related-art power techniques. For instance, the system may have a particular use in thermostat applications over relatively large dynamic load currents ranging from 100 uA to 1 A with a low AC voltage applied. Thermostats utilizing power obtained in the present manner may be a part of a heating, ventilation and air conditioning (HVAC) mechanism and/or a building automation system. Power transformation may be utilized in other components of the building automation system. 
         [0030]      FIG. 1   a  is a diagram of a power transformation circuit  11 . Circuit  11  may provide a way to charge an internal energy storage device, for instance, a capacitor  82 , in a continuous, pulsed or pseudo continuous manner. This behavior may occur in functional states of a load ( 17  or  18 ) having an “off” condition or an “on” condition. Energy may be delivered to a pre-storage device in a continuous manner relative to the impressed AC voltage. Related art systems may interrupt the load current to charge, i.e., to redirect the current into storage elements. 
         [0031]    Since the present energy transfer approach, mechanism or block  50  may be continuous, no frequency or time dependency will necessarily exist as to when to divert the load current. Because the energy transfer is continuous, the overall currents may be much smaller than related-art power techniques. For example, a 16 mA pulse current for 1 m sec may essentially be the same as 1 mA taking over one entire line cycle at 60 Hz. The present approach may dramatically lower the probability of falsely tripping loads from an “off” state to an “on” state. 
         [0032]    Power transformation topology of circuit  11  may allow energy to be drawn from two or more loads (e.g., loads  17  and  18 ) in a simultaneous fashion while the loads are in an “off” or “on” state. This may allow for a higher degree of load current to be transformed into a charging current of a harvesting system. 
         [0033]    Power transformation may precisely calculate the load impedance as a function independent of applied power frequency. Therefore, a calculation may allow inductive or capacitive loads to be correctly categorized. Power transformation circuit  11  may be particularly interesting when one understands the capability that the transformation circuit  11  topology offers relative to the amount of energy that the circuit can transform into useable charging current. The topology may engage the load over a wide dynamic range (per application), transfer control of the AC load current to a programmable current source  51  while determining the load current directly. Subsequently, the system may transfer virtually all or portions of that current to a storage device  82  via a secondary charging current source (CCS)  74 . 
         [0034]    A secondary charging element may be chosen for a level arbitrarily or specifically. Charging currents are not necessarily inherently bound with the present topology. For instance, a value of 200 mA may allow for a satisfactory user experience. 
         [0035]    The approach to balance the two programmable current sources  51  and  74  may also have a desired effect in that the current through the load is not necessarily altered other than having a minor loss of current due to an insertion of an applied voltage drop of power transformation circuit  11 . 
         [0036]    The present system may be in a particular class of power devices since charging currents at different levels up to 200 mA can be realized. Charging rates may be controlled by the system. A design of a secondary charging element may be artificially bound to a maximal level to protect the storage element. 
         [0037]    As power transformation circuit  11  passes the entire load current from an internal activation switch to a saturated current source  51 , power transformation device or charge transfer block  50  may need only to measure the current through current source  51 , and calculate the effective impedance of the load via Ohm&#39;s law. A direct measurement may allow the device to set an “off” load condition that will not necessarily cause false load tripping. A direct determination may eliminate “trial” test current approaches or fixed approaches as known with related art systems. Current through source  51  may be determined by measuring the voltage drop across a 2.1 ohm resistor  53 . Resistor  53  may be of another value. Resistor  53  may have a different value or an amplifier on line  52  for a gain change. 
         [0038]    Inductive relay loads may be known to exhibit a high degree of inrush current when they are activated. The inrush may occur during times when a physical armature in a load  17  or  18  is moving or is about to move. Over a life and application usage, the inrush component may increase. The effect may be dramatic when debris has become lodged in the device. It is not necessarily wise to limit such current in any manner since the device will not necessarily reach a satisfactory “on” state, or the device may chatter and ultimately lead to having contact failure or equipment stress. For this reason, the power transformation topology may use a parallel switch structure (i.e., switches  27  and  31  for load  17  and switches  28  and  32  for load  18 ) which is firstly engaged to power the loads. 
         [0039]    The power transformation topology may determine whether the system is connected to an inductive load (e.g., with a moveable armature) with several approaches. A determination may be important for setting the optimal value for an “off” state energy transformation. Independent of the inrush, the steady state AC current of a contactor relay load may be different when activated or not activated. The power transformation topology may have several mechanisms to deal with the discrepancy in order to increase the fidelity of charge rates. A measure of inductive impedance may be used to provide a steady state compensation value against for an off cycle approach. 
         [0040]    One mechanism is that a direct impedance calculation may be made when the relay is in an “on” state. When a device sets the “off” mode power transformation level, the device may test the desired voltage drop which actually occurred across the load. If the resultant drop is more than expected, then this means that an inductive load with an armature may certainly be present provided that the VAC is monitored and compensated for. The present power transformation system may easily compensate for the impedance difference. 
         [0041]    Another mechanism may be able to derive that the armature has moved, by detection of a sudden impedance change through plausibility testing or “direct observation” via characterization. Either of these techniques may be invoked after determining if the split current source (SCS) has enough dynamic range to overcome the inrush of the contactor; otherwise, reliability of the system may be compromised. 
         [0042]    As to a first option, it may be possible to increment the first current source while observing the resultant current value. When one of the increments results in a slope inflection outside of what was previous predicted by past incremental changes, there may be an implication that an armature has been moved by a sudden impedance change. Otherwise, there may be a linear response depending on step size. 
         [0043]    As to a second option, it may also be possible to apply the first current source at a maximal current level (saturated) and perform a fast A2D process on that resultant current wave form, allowing the capture of step changes that may have occurred in its response, as caused by an armature moving, which may be a form of load characterization.  FIGS. 2 and 3  are waveform diagrams that may illustrate the current waveform at an SCS_a2d (i.e., a connection between SCS  51  and resistor  53 ). The waveform diagram  121  of  FIG. 2  may illustrate a case for an inductive load with armature movement shown. The waveform diagram  122  of  FIG. 3  may demonstrate a case of a resistive load. 
         [0044]    The waveforms of  FIGS. 2 and 3  may illustrate that increasing the amount of charging current that a relay load can manage prior to pull in may be optimally achieved with the load in an “off” state, since a primary technique of a direct impedance calculation at running load may result in an impedance lower than what exists in the “off” state of the load. The measurement obtained with the direct impedance calculation may be safe from the perspective on being conservative so as not to cause false activation of loads. 
         [0045]    An internal parasitic nature capacitance loading may cause losses in what can be transformed to energy storage. A loss may occur when a rectified voltage is impressed across a capacitor (for instance, capacitor  57 ). ( FIG. 1   c .) An example value of capacitor  57  may be 47 microfarads. The charging ripple current may be wasted back to a load as it cannot necessarily be converted to a charging current. One the other hand, the capacitance may help to balance the current though the secondary current source which aids an “on” cycle mode. Power transformation circuit  11  may utilize a FET  58  with a gate  59  control to introduce bulk capacitance when it is beneficial and eliminate the bulk capacitance when it is detrimental. 
         [0046]    An approach may be utilized to determine load impedance. Impedance information may be used in a following manner. One may select a continuous (or pulsed) off cycle power level per terminal. That level should not exceed levels of a typical electronic interface logic circuit consistent with TTL, CMOS, or other logic. 
         [0047]    Split dynamic power transformation may allow energy to be harvested off a power line  16  when a load  17  or  18  is energized by the power line. A load of interest may be firstly selected by activating switch  31  or  32  (S1 or S2). Power transformation circuit  11  may then capture an A2D value on a Split_A2D at a connection point  56  of series connected resistors  54  and  55  forming a voltage divider between a rectifier output voltage line  41  and output reference line  30 . The readings may have important information relative to the power transformation device. 
         [0048]    One may determine if a load is connected to terminal  56  for Split_A2D, and provide directional information about the magnitude of the applied voltage, VAC, as indicated by voltage divider point  56  between resistors  54  and  55  and a load  17  and/or  18 , except for some diode voltage drop in full-wave rectifier  25  (D1). The internal voltage divider impedance may be chosen to be at least two orders of magnitude higher than useful load values. The internal impedance values may be, for instance, 205K ohms and 14.7K ohms, as compared to loads in which useful energy can be derived may be from 10 to 2K ohms at 60 Hertz. One may see from an inspection that the load impedance does not necessarily significantly alter a present view point of VAC based on an authority of an external network. The diode network influence of rectifier  25  may provide or need some compensation as the current through the network is bound and dominated by an internal resistor network. System  11  may indicate a power transformation error if the value returned indicates that the load is too high or the VAC is too low. 
         [0049]    A load of interest may be completely energized by a parallel load control device  27  and/or  28  (K1 and/or K2). SCS  51  may be configured to a saturated condition with respect to its drop introduced against load  17  and/or  18 . It can be noted that switch  27  and/or  28  (K(n)) may then be deselected and the load current may be transferred to internal SCS  51  in its entirety. All load current may come in and control of it is taken. The value of the current may be determined by a direct reading of SCS_a2d at the connection point of SCS  51  and resistor  53 . With this reading (and VAC bound from the reading determined above), for mechanism  131  ( FIG. 1   c ), the impedance of load  17  and/or  18  may be closely estimated using Ohm&#39;s law. That may be indicated by the voltage of line  41  as determined by divider combination of resistors  54  and  55  divided or bound above by mechanism  131 , by the current indicated by the voltage across resistor  53 . That value may be used for an “off” cycle power transformation and the VAC may be recorded and tracked on a periodic basis. 
         [0050]    Power transformation may incorporate a special network to speed up the process to transition from the fully saturated condition to a level where the split current source (SCS)  51  comes out of saturation. The behavior of a new circuit, InD, may allow SCS  51  to find the point at which perturbation in a load  17  and/or  18  connected line can occur because of a present configuration relative to a rectified and non-filtered voltage being applied to a current source working with a dc biased op-amp. Op-amp overshoot during the valleys associated with the applied VAC may cause current injection which in-turn can cause line perturbation which directly indicates that the SCS  51  is coming out of saturation. Once this point is determined, the pulse width modulation (PWM) signal to an input  61  of SCS  51  may be increased slightly to stop the firing of the InD and a bulk capacitor may be activated to smooth out the applied voltage presented to SCS  51 . SCS  51  may be further eased out of saturation as part of the next step. 
         [0051]    The InD circuit may eliminate a need to perform an a2d conversation with stabilization times involved after each incremental value. 
         [0052]    A CCS  74  may reside in parallel with the SCS  51 . An initial value may be programmed in CCS  74 . The SCS  51  circuit may be connected across CCS  74  by activating FET  62  (S4) in a high bias (voltage) mode. 
         [0053]    The PWM value to line  61  of SCS  51  may be lowered until SCS  51  comes out of saturation and a value of about a 3.0 VDC drop is achieved across SCS  51  and in turn CCS  74 . Therefore, the current through the split current source  51  may be transferred to charging current via CCS  74 . Depending on the load, SCS  51  may go to zero or remain active such that the current through load  17  and/or  18  is not necessarily affected other than by an introduction of a drop across the internal network of block  50 . The drop may incorporate rectifier (D1)  25 . Rectifier  25  may utilize Schottky diodes which result in fewer effects than ordinary non-Schottky diodes. The drop of switch (S4)  62  may be calibrated out. This is via feedback on aVal  78 . 
         [0054]      FIG. 1   c  is a diagram of circuit  125  that may be similar to circuit  11  of  FIG. 1   a . The single S1 switch  31  ( FIG. 1   a ) may be substituted with a two S1′ switches  126  and  127  connected by lines  128  and  129 , respectively, to an S1′ enable. One may note  FIG. 12   a  for an implementation of the other version having one rectifier with many switches, that is, one switch per channel. 
         [0055]    At the voltage divider of resistors  54  and  55  with a line  56  at the junction of resistors  54  and  55 , a comparator  131  may have a non-inverting input connected to line  56 , and an inverting input connected to a voltage reference. An output  132  of comparator  131  may indicate with a binary signal PT EN (start) whether the voltage at line  56  is below, meets or exceeds the voltage reference. Resistors  54  and  55  may have high resistance with the comparator  131  and thus be quite a low current drain on line  41  of the charge transfer block  50 . 
         [0056]    Another voltage divider having resistor  133  connected to line  5  and resistor  134  connected to ground  30 , with a line  135  connected to a junction of resistors  133  and  134 . Line  135  may be connected to a comparator like the arrangement of comparator  131 . 
         [0057]    Battery  91  may be a single battery or a multitude of them. The battery may be a non-rechargeable or a rechargeable one with appropriate charging circuitry. 
         [0058]    Diodes  92 ,  93  and  94  in circuit  11  may be replaced with FET switches  137 ,  138  and  139 , respectively, in circuit  125 . The drain of FET  137  may be connected to line  83 , the source may be connected to line  95  of the Vdd output. A control signal may go to an input via a 634 ohm resistor  141  to the gate of FET  137 . The gate may be connected to ground  30  via a one meg-ohm resistor  142 . The gate may also be connected to a line  69  of an output of buck converter  47 , via a 150 kilo-ohm resistor  143 , lines  155  and  145  and a zener diode  144 . The anode of diode  144  may be connected to line  69 . 
         [0059]    Values of noted components noted herein are examples but could be other values. 
         [0060]    A control signal may go to an input  146  via a 634 ohm resistor to the gate of FET  138 . The gate may be connected to line  145  via a 150 kilo-ohm resistor  148 . The gate of FET  138  may be connected to a ground  30  via a one-meg-ohm resistor  147 . The source may be connected to line  95 . The drain may be connected to line  87 . 
         [0061]    A control signal may go to an input  149  via a resistor  151  to FET  139 . The gate may be connected to ground  30  via a resistor  152 . The drain may be connected to line  69  and the source may be connected to line  95 . 
         [0062]    The power transformation approach may incorporate a FET logic control to improve the various modes needed by the application in order to power at least two power rails; VDD and VDD2. 
         [0063]    BSV1, BSV0, BO_Ctrl may be configured to be connected to pins of micro controller that are Hi Z at power up 
         [0064]    B2_en may have an integral pull up such as high (active) any time a battery is installed. 
         [0065]    Function split_A2D may be run with a discrete go no-go circuit; in this case, the micro controller pin may read it as a general IO instead of an A2d process. 
         [0066]      FIG. 1   b  is a diagram of a circuit  153  which may be similar to circuit  125  of  FIG. 1   c . Line  155  may be disconnected from line  145  and connected to a cathode of a zener diode  154 . An anode of zener diode  154  may be connected to line  69 . Many of the unnumbered components of circuit  153  may have the same numerical designations as those components of circuit  125  in  FIG. 1   c . Activation of these signals may be as inputs and/or output and these allow the power modes that are possible. 
         [0067]      FIG. 1   d  is a diagram of loads  161  that may be connected to output lines  83  and  95  of circuits  11 ,  153  and  125  in  FIGS. 1   a ,  1   b  and  1   c , respectively. Loads  161  may incorporate some processor control relative to the power transformation circuits  11 ,  153  and  125 . 
         [0068]      FIGS. 4 and 5  are example schematic diagrams  101  and  102  of current sources  51  and  74 , respectively. 
         [0069]      FIGS. 6   a ,  6   b  and  6   c  are diagrams of simulated waveforms. A graphical simulation may illustrate the charging current  104  on line  75  of  FIGS. 1   a - 1   c  and  5  as shown in the waveform of  FIG. 6   a . Waveform  106  is the voltage on line  75  for charging current. A current transformation of current  104  is shown in a diagram of  FIG. 6   b . SCS  51  may have control of the load current as measured voltage drops  108  across resistor  53  at a first part of the waveform. Line  112  may represent the current to CCS  74 . Waveforms  108  and  112  may represent a range current. The  112  waveform of currents may be measured at line  75  of  FIGS. 1   a - 1   c  and  5 . 
         [0070]    Virtually all of the available current may be transferred to CCS  74  at line cycles  113  after a few line cycles  107 . A diagram of  FIG. 6   c  shows waveform  114  of voltage across load  17  which may indicate load  17  current for a range of charging current. A summed load current does not necessarily change in any manner during a transition  116  from line cycles  107  to line cycles  113 . Thus, with load activation by switch  27  or  28  (K1 or K2), the current through load  17  or  18 , respectively, at point  56  may be proportional to the applied VAC. 
         [0071]    At this stage, VAC changes may be monitored at point  56  and values of SCS  51  and CCS  74  altered. Typically, there may be more interest in a loss of AC or brown out conditions where system operation could be terminated. The charging process may be modulated by tuning the increasing of the value of SCS  51  and/or reducing the value of a CCS  74 , or typically doing both. The charging process may be completely terminated by reselecting switch  27  or  28  (K(n)), respectively, to return the load  17  or  18  to an un-fettered state. 
         [0072]    Charge transfer block  50  may have other features. Load currents may be high as compared to what could exist on line  83  when Wi-Fi and high powered engines involving voice or displays are present. Related-art systems may typically make the user wait while charging the internal storage device to the point where it can support local processes. The present power transformation system  11  may incorporate an approach to “fast” charge the system from a replaceable energy storage device  91  such as an alkaline or lithium battery. An “n” farad ultra capacitor  82  (C2), or super-capacitor, may gain enough charge to support the Wi-Fi access point and let one run a display system, in a matter of, for instance, one to ten seconds rather than, for instance, 20 to 40 minutes. “n” may indicate a number of farads for capacitor  82 . However, increasing storage capacity may generally allow longer display intervals as do lower power displays. 
         [0073]    An ultra capacitor may be regarded as, for example, a super capacitor, electrochemical capacitor, or an electric double layer capacitor. The ultra capacitor may be made from, for instance, carbon aerogel, carbon nanotubes, or highly porous electrode materials, or other materials that can result in extremely high capacitance within a small package. Such capacitance may range from one-half farad to 200 farads or more. Depending on the power output requirements of system  11  from capacitive storage, the capacitance of the capacitor  82  might be less than one-half farad in certain designs. 
         [0074]    Capacitor  82  may be a single capacitor or a multitude of capacitors connected in a parallel and/or a series configuration. Generally, the number of farads of capacitor  82  may be one or greater than one. In the present instance, the number of farads of capacitor  82  may be five. 
         [0075]    Replaceable battery  91  may be tapped at other times when power transformation techniques are not necessarily deriving enough energy dependent on intermittent usage, such as may occur with voice or code down load periods. 
         [0076]    A last element of charge transfer block  50  may be an approach to allow a common connected device to utilize the charging system or at least inform the power transformation that its features may be needed. 
         [0077]    The topology of  FIG. 1   a  may allow a buck converter  47  to have less dynamic range as it merely would need to support fast charge rates and not necessarily need to be rated up to 300 mA (or more) as what might be needed for voice, display and Wi-Fi systems. 
         [0078]    Other ancillary functions may be incorporated. It may be advantageous to incorporate a CCS  74  rate monitor sub-circuit to eliminate calibration issues associated with the current source over its input voltage compliance range. This may be particularly useful when the CCS  74  is used in the high voltage mode associated with an “Off” load power transformation. 
         [0079]    System  11  may have a sub-circuit to monitor changes in applied VAC. The sub-circuit may improve the fidelity of the system and eliminate extensive tolerance analysis. For instance, CCS may be a pseudo current source for calibration, detection in applied VAC. 
         [0080]      FIG. 1   a  is a diagram of a power transformation system  11 . A furnace system  12  showing a step-down 120/24 VAC transformer  14  may have a common line  15  and a 24 VAC hot line  16 . Common line  15  may be regarded as a ground or reference voltage for furnace system  12 . Also, common line  15  may be connected to one side of loads  17 ,  18  and  19 . Loads  17 ,  18  and  19  may have another side connected to lines  21 ,  22  and  23 , respectively. Loads  17 ,  18  and  19  may relate to heating, air conditioning, and ventilation, respectively. The loads may instead relate to other kinds of components. Terminals connecting lines  16 ,  21 ,  22 ,  23  and  15  between furnace  12  and power transformation system  11  may be labeled “R”, “W”, “Y”, “G” and “C”, respectively. 
         [0081]    Line  16  may be connected to a first terminal of a full wave rectifier  25 , a first terminal of a full-wave rectifier  26 , a first terminal of a relay  27 , a first terminal of a relay  28  and a first terminal of a relay  29 . 
         [0082]    Line  21  may be connected to a second terminal of relay  27  and a first terminal of a relay  31 . Line  22  may be connected to a second terminal of relay  28  and a first terminal of a relay  32 . Line  23  may be connected to a second terminal of relay  29 . Line  15  may be connected to a second terminal of full-wave rectifier  26  and to a cathode of a diode  33 . A second terminal of full-wave rectifier  25  may be connected to a second terminal of relay  31  and a second terminal of relay  32  via a line  34 . 
         [0083]    Relay  27  may be controlled by a signal from a controller  40  via a line  35 . Relay  31  may be controlled by a signal from controller  40  via a line  36 . Relay  32  may be controlled by a signal from controller  40  via a line  37 . Relay  28  may be controlled by a signal from controller  40  via a line  38 . Relay  29  may be controlled by a signal from controller  40  via a line  39 . 
         [0084]    Rectifier or rectifiers  25  may be configured with various layouts to allow multiple sources of power. There may be additional S1, S2, Sn functions with a single rectifier  25  ( FIG. 12   a ) or multiple rectifiers  25  with S1&#39;s ( FIG. 12   b ). An example circuit for the rectifiers may incorporate also third and fourth terminals. A first diode and a second diode may have cathodes connected to the third terminal. The first diode may have an anode connected to the first terminal and the second diode may have an anode connected to the second terminal. A third diode and a fourth diode may have cathodes connected to the fourth terminal. The third diode may have an anode connected to the first terminal. The fourth diode may have an anode connected to the second terminal. 
         [0085]    The third terminals of rectifiers  25  and  26  may be connected to a common ground or reference voltage terminal  30  of power transformation system  11 . The fourth terminal of rectifier  25  may be connected to a line  41  to a charge transfer block  50 . The fourth terminal of rectifier  26  may be connected to an emitter of a PNP transistor  42 . 
         [0086]    A resistor  43  may have a first end connected to the emitter of transistor  42  and a second end connected to a base of transistor  42 . A resistor  44  may have a first end connected to the base of transistor  42  and a second end connected an anode of diode  33 . A capacitor  45  may have a first terminal connected to the anode of diode  33  and a second terminal connected to ground  30 . A collector of transistor  42  may be connected to a line  46  to an input of a buck converter  47 . A capacitor  48  may have a first terminal connected to the collector of transistor  42  and a second terminal connected to ground  30 . This may be a C wire selector/monitor reading Vx, and BC_Vdc ( FIG. 11   a —hardware based). 
         [0087]    Charge transfer block  50  may incorporate a split current source  51  having a first terminal connected to line  41  and a second terminal connected to a line  52 . Line  52  may be connected to first end of a low ohm (2.5Ω) resistor  53 . A second end of resistor  53  may be connected to ground  30 . An input for a value to current source  51  may be provided on line  61  to source  51 . 
         [0088]    Block  50  may incorporate a voltage divider having a resistor  54  and a resistor  55 . Resistor  54  may have a first end connected to line  41  and a second end connected to a line  56  and to a first end of resistor  55 . Resistor  55  may have a second end connected to ground  30 . 
         [0089]    Block  50  may incorporate a capacitor  57  having a first terminal connected to line  41 . Capacitor  57  may have a second terminal connected to a first terminal of a FET or switch  58 . A second terminal of switch  58  may be connected to ground  30 . Switch  58  may be controlled by a signal from controller  40  via a line  59  to its gate or control terminal of FET or switch  58 . 
         [0090]    A FET or switch  62  may have a first terminal connected to line  41  and a second terminal connected to a line  65 . FET or switch  62  may have a gate or third terminal connected to a line  66  for receiving a signal to control FET or switch  62 . A FET or switch  63  may have a first terminal connected to a line  69  which is connected to an output of buck converter  47 . Switch  63  may have a second terminal connected to line  65 . A gate of third terminal of FET or switch  63  may be connected to a line  67  for receiving a signal to control switch  63 . A FET or switch  64  may have a first terminal connected to line  65  and have a second terminal connected to a line  71 . Line  71  may be connected to a first terminal of a boost circuit  72 . A gate or third terminal of FET or switch  64  may be connected to a line  68  for receiving a signal to control switch  64 . 
         [0091]    A programmable current source  74  may have a first terminal connected to line  65 . Source  74  may have a second terminal connected to a line  75 . A third terminal and a fourth terminal may be connected to a line  76  and a line  77 , respectively for inputs to source  74  for setting a range. A fifth terminal may be connected to a line  78  for providing an output indication from source  74 . 
         [0092]    A capacitor  82  may have a first terminal connected to line  75  and a second terminal connected to ground  30 . A boost circuit  81  may have a first terminal connected to line  75 . A second terminal of boost circuit  81  may be connected to an output line  83 . A third terminal of boost circuit  81  may be connected to a line  84  which can provide a signal for controlling circuit  81 . 
         [0093]    A capacitor  85  may have a first terminal connected to line  83  and a second terminal connected to ground  30 . 
         [0094]    Boost circuit  72  may have a second terminal connected to a line  88 . A third terminal of boost circuit  72  may be connected to an output line  87 . A fourth terminal of boost circuit  72  may be connected to a line  89  which can provide a signal for controlling circuit  72 . A battery assembly  91  may have a positive terminal connected to line  88  and a negative terminal connected to ground  30 . 
         [0095]    Output line  83  may be connected to an anode of a diode  92 . Output line  87  may be connected to an anode of a diode  93 . Line  69  from an output of converter  47  may be connected to an anode of a diode  94 . Cathodes of diodes  92 ,  93  and  94  may connected to an output line  95 . A capacitor  96  may have a first terminal connected to line  95  and a second terminal connected to ground  30 . A capacitor  97  may have a first terminal connected to line  69  and a second terminal connected to ground  30 . 
         [0096]      FIGS. 7   a ,  7   b ,  7   c ,  7   d ,  7   e ,  7   f  and  7   g  are diagrams of activities of certain portions of the power transformation circuits in  FIGS. 1   a - 1   c . Referral to letter, alphanumeric or numeric designations in  FIGS. 1   a - 1   d  may be made in  FIGS. 7   a - 7   g .  FIG. 7   a  is a diagram revealing an approach  171  for a power up initialization.  FIG. 7   b  is a diagram for an approach  172  to maintain and an approach  173  for an impedance determination.  FIG. 7   c  is a diagram for an approach  174  for a charge from R terminal while an HVAC is active.  FIG. 7   d  is a diagram for an approach  175  for a charge from R terminal while the HVAC is inactive.  FIG. 7   e  is a diagram for another approach  176  for a charge from R terminal while the HVAC is inactive.  FIG. 7   f  is a diagram of an approach  177  for a C2 charge from a battery and an approach  178  for a C2 charge from a buck converter. 
         [0097]      FIGS. 8   a ,  8   b ,  9   a - 9   c ,  10   a - 10   c , and  11   a - 11   c  are schematics of an illustrative example of the present power transformation circuit. The schematics may be useful for constructing an example of the circuit. 
         [0098]    A right end of the circuit in a diagram of  FIG. 9   a  may have a DC block. 
         [0099]    Some power stealing systems may appear to have had issues working with furnace topologies which incorporate simple control systems. A particular class of equipment may have utilized the power controlled by the W terminal in series configuration with flame safety interlocks. Power stealing with this series connected load may have historically made the conventional power stealing problem difficult as the gas valves used in the furnace may be particularly sensitive to any voltage perturbation which will occur with energy is being diverted within the thermostat to run the thermostat in the most basic two wire system. 
         [0100]    “W” may represent a heat relay or switch terminal, or the like. “C” may represent a 24 V common terminal or the like. 
         [0101]    The present power transformation system may have introduced a new capability that allows the thermostat to learn what type of equipment it has connected. When the PT encounters a series gas valve system, the PT may deal with the valve system in a special way and provide additional insight to the operation of the furnace from a flame quality perspective. Having this feature in a communicating thermostat may allow the customer to receive advanced warnings that the flame sensing mechanism is becoming faulty before the mechanism completely fails to light. 
         [0102]    This feature may be particularly useful for services such as Honeywell&#39;s contractor portal. 
         [0103]    No known thermostat appears to have been known to provide an early warning that a light off problem is occurring and call for service. 
         [0104]    The power transformation system may do this and “record” the real time current domain information which the furnace is using and “characterize” exactly when a main flame establishing period is occurring and also monitor whether it was successful or not. 
         [0105]    Waveforms ( FIGS. 17 and 18 ) may represent a normal light off and a sequence of three trials for main flame proving with subsequent failure. One may see from inspection of the three main flame establishing periods noted (at the 0.65 amp level) this is the time (after purging) where the igniter and valve are turned on and the light-off fails or succeeds and the sensing of it fails. 
         [0106]    A file listed as stepped gas valve may illustrate a different burner system and specifically the current waveform through the W terminal. One may immediately note the five distinct levels occurring . . . from left to right: 0 mA=output off; 180 mA=purging; 260 mA=hot surface ignition (HIS) warm up period; 665 mA=main valve+HSI; and final and finally the main valve alone. 
         [0107]    The characterization mode of this disclosure may record and process up to nine levels which are more than sufficient to handle the numerous burner types. 
         [0108]    Another type of interesting challenging load is also included. This is a hot water zone valve operator that has caused many two wire energy harvesting systems problems for many years. This valve (i.e., wax motor operation) may have unique characteristics in that it has a resistive heater load that melts wax which allows a spring to open the valve. One valve mechanism may be completely open and cause a limit switch to trip which allows the wax to cool and the valve mechanism may start to close (by the spring pressure) until the switch is made and the heater is again energized. Existing energy harvesting systems cannot handle the loss of power the valve presents to the W terminal. 
         [0109]    The characterization process within may easily handle the present system. A background of a mode objective may be noted. 
         [0110]    An HB thermostat may run a special test on just a W terminal. The purpose may be two-fold. The first may be to determine whether a significant probability exists to indicate that a gas valve is being driven off the power supplied through this terminal. The second may be to determine whether a significant probability exist which indicates that a “power interrupting” wax powered hydropic valve present. 
         [0111]    Entry of mode exclusions or deferrals may incorporate the following. 1) Characterization will not necessarily run if a C-wire is present. These requirements may be all dependent just when a phantom mode is selected. 2) Certain ISU (installer setup utility) settings that preclude characterization testing from running may be as follows. a) ISU has been configured to “Radiant with Hot water” heating type. Power may interrupt wax motor valve detection. b) System configuration indicates Heat Pump. c) There may be an electric heat operation. 
         [0112]    3) There may be a wall plate configuration. Selecting DT (Dual Transformer) may preclude PS on W and hence characterization is not necessarily needed. 
         [0113]    4) There may be temporary low latency ping rates. One may expect to use a battery and run for 120 seconds after a Wi-Fi reset specifically at the end of DIY mode. Any system call for load control may result in control deferral (W load will not necessarily engage) until low latency period expires. 
         [0114]    5) All resets of the EM may cause a random start delay of equipment. The initiation of characterization mode should be deferred for 120 seconds. This period may allow stabilization of the Wi-Fi energy consumption prior to entering characterization mode on the W terminal. 
         [0115]    6) Reaching the critical BBT may terminate characterization mode testing. K1 may be re-engaged to continue heat call. After the BB period is reached and provided the 80 second main flame establishing period has expired, the default of using soft start power stealing levels should be deployed for the balance of that call. 
         [0116]    7) If the phantom is already charging from battery, one may delay the heat call until a battery charge is no longer needed. 
         [0117]    If the test is proven affirmative, the device may run characterized load behavior thereafter for “on” cycle power stealing, until Y is known and which time the load is preferred of on and off cycle stealing. 
         [0118]    For Heat only applications “Off” cycle power stealing should always only use the first interval level for power setting biased on impedance. For Heat/Cool mode operation the Effective Impedance for off cycle, stealing should be the parallel combination with Y load (when present) or known. 
         [0119]    Re-setting a characterization mode may be noted. The test may require augmentation from the battery, therefore a non-volatile memory element should be written or reset under certain conditions to preclude excessive use of the battery. The results of the test may leave a non-volatile memory element which can only be reset by the following methods of Factory reset, Subsequent ISU configuration change affecting load control, and power method change (phantom to C wire). 
         [0120]    A characterization mode algorithm test (CMAT) may be noted. Any call for W activation may be delayed until an ultra-capacitor is charged to &gt;2.3V. The battery may be used to accelerate the charging. During the characterization period, a power broker should revert to a special substantial savings mode with Wi-Fi left running while disabling sound and the glow ring behavior. The device display should indicate a special screen indicating “Learning Heating Load” if display is on. 
         [0121]    CMAT should run for about 80 seconds. A timer may be started when K1 engages for the first second (thereby removing any inrush component). An OPA Split may be brought on, Split PWM is set to 100%, and yet S4 Low and High may be held false. 
         [0122]    CMAT should measure the load current every second while recording intervals where a step behavior (&gt;50 mA) is noted. Subsequent operations of the W terminal may inherently blank out periods to avoid on cycle power stealing when a transition is likely to occur. 
         [0123]    At the conclusion of the characterization interval, the phantom circuit may engage in either normal on-cycle mode (150 mA), or engage a special lower voltage drop mode known as soft start (75 mA). Characterization criteria may be noted below. 
         [0124]    Loss of AC should be monitored by the CMAT readings in that any Vscs equivalent that is less than 50% of the first interval shall initiate entering into a survival mode for AC loss. 
         [0125]    Characterization criteria and subsequent on cycle power action may be noted relative to types 1, 2 and 3 of loads. As to a type 1 load, the W load is not necessarily stepped. It may still involve a gas valve. If the load is &gt;200 mA, one may declare the load as characterized and use a soft-start mechanism. Soft start power stealing may be used as needed with no time of activation restriction. An on-cycle BBT may be used consistent with a 400 ohm load. 
         [0126]    As to a type 2 load, the W load may have at least one step greater than 50 mA detected during the characterization period. On cycle power stealing should not necessarily be engaged during the blank out periods and soft start power steal shall be used exclusively. BBT may be used consistent with a 400 ohm load. 
         [0127]    A type 2 load relative to a loss of flame recovery may be noted. CMAT should declare a time period when the expected main valve is likely to be engaged. Phantom engagement should happen past that point in about +5 seconds minimum. If a measurement returns a lower level consistent with purge or HSI or Sparking, the CMA may terminate power stealing and characterization mode should be continued for up to two additional main flame establishing periods plus post purge times, or until a re-light is successful, at which point the soft start stealing method shall be re-engaged. 
         [0128]    The power broker should be notified to institute a substantial savings mode until a characterization has concluded. If the system does not hold in the main valve (by evidence of level), the system should soft power steal at what-ever level is available: If the system cannot move the heating load within 15 minutes, the HB should report possible heating issue because of AC voltage or likely flame problem. 
         [0129]    If the main valve is suddenly lost (after the first conformational measurement and first engagement has concluded) (per the above paragraph pertaining to a measurement returning a lower level consistent with a purge or HSI or sparking), it may appear to the phantom circuit as a sudden loss in mA charge rate has occurred consistent with a major change in applied AC. Prior to indicating that conclusion the phantom circuit should immediately re-enter characterization mode. 
         [0130]    If the measured load is consistent with a previously known level, then an AC loss is not necessarily affirmative but a loss of flame may have occurred. If AC loss was detected, the device should enter survival mode for loss of AC. 
         [0131]    Otherwise, the characterization mode should be continued for up to two additional main flame establishing periods plus post purge timing or until a re-light is successful, at which point the soft start stealing method should be re-engaged. The power broker should be notified to institute a substantial savings mode until when the characterization mode is complete. 
         [0132]    If the system does not get into the main valve (by evidence of level), the system should soft power steal at what-ever level is available after three intervals of attempting main valve levels. If the system sensed temperature cannot move the heating load within 15 minutes, then the HB shall report a possible heating issue because of low AC voltage or a likely flame establishing an issue. This information may be particularly valuable to services such as contractor portal to generate a service call. 
         [0133]    A system that has worked well for many cycles, yet suddenly starts to exhibit main flame establishing errata should be reported as a potential loss of service issue. This issue may be due to a poor flame proving as would occur with fouled flame rod. A message should be propagated for service suggestion. 
         [0134]    If the situation happens at an initial install, a compatibility issue may be apparent and should be reported. A compatibility issue may be further apparent if the main valve is held in during the 80 second learning period but loses flame consistent with an engagement of a soft start power steal approach. 
         [0135]    Possible causes may be an aged gas valve, low system voltage due to in-sufficient VA of transformer or low system voltage due to loading of other equipment such as humidifier. A work around recommendation for this situation may be to add a faux loading 1K ohm resistor from the cool terminal to the systems transformer common connection to retain H/C configuration option. 
         [0136]    A power interrupting wax motor valve detection may be noted. A wax motor valve may have unique characteristics in that it has a resistive heater load that melts wax which allows a spring to open the valve. One, the valve mechanism is completely open, a limit switch may be tripped which allows the wax to cool and the mechanism starts to close (by the spring pressure) until the switch closure is made and the heater is again energized. 
         [0137]    If the measured current of the valve is &gt;750 mA, the characterized load testing should be run in testing for this behavior. Otherwise, do not necessarily characterize the load, but one may use a soft start. Normal on-cycle power stealing should be allowed. After 1 minute to 4 minutes of a sensed ma-charge, current may exhibit a significant change in value due to operation of the heater and power interrupting contact. If phantom logic detects an abrupt ma-charge change (within this interval), the system may switch to a characterized measurement process to determine if the special valve is present or if an actual power disturbance exists. 
         [0138]    A characterized approach may be noted. The wax valve should be characterized by observing that an interrupted or significant current level change occurs, is greater than 500 mA and does not last longer than 60 seconds. If the duty cycle behavior is observed, the NV ram values should be set to characterize as a type 3. The characterize module may pass an average timing of the off (lower) interval as well. Values for the high interval and low interval should also be written. 
         [0139]    The normal power stealing module may ignore the duty cycling behavior unless the time of the low interval duration increases by 50 percent. The normal module may return the load to the characterization module for a loss of AC determination. Otherwise, if no load changes are detected, the load may be treated as non-characterizable for the future. 
         [0140]    The following ISUs, for an instance of a thermostat, may cause a load to be re-characterized when they are changed. 
         [0141]    INDEX_ISU_INSTALLATION_TYPE 
         [0142]    INDEX_ISU_HEAT_SYSTEM_TYPE — 1 
         [0143]    INDEX_ISU_HEAT_EQUIP_TYPE — 1 
         [0144]    INDEX_ISU_COOL_STAGES 
         [0145]    INDEX_ISU_HEAT_STAGES 
         [0146]    INDEX_ISU_FAN_OPERATION_IN_HEAT 
         [0147]    INDEX_ISU_AUX_BACKUP_HEAT_TYPE 
         [0148]    INDEX_ISU_EXTERNAL_FOSSIL_FUEL_KIT 
         [0149]    INDEX_ISU_AUX_BACKUP_HEAT_FAN_OPERATION 
         [0150]    INDEX_ISU_CPH_HEATS1 
         [0151]    INDEX_ISU_CPH_HEATS2 
         [0152]    INDEX_ISU_CPH_BACKUP1 
         [0153]    INDEX_ISU_HUMIDIFIER_TYPE 
         [0154]    INDEX_ISU_VENT_TYPE 
         [0155]    The following ISUs may not necessarily cause a re-characterization when changed. 
         [0156]    INDEX_ISU_TSTAT_CONFIGURED 
         [0157]    INDEX_ISU_LANGUAGE 
         [0158]    INDEX_ISU_ZONE_NUMBER 
         [0159]    INDEX_ISU_DEVICE_NAME 
         [0160]    INDEX_ISU_SCHED_OPTIONS 
         [0161]    INDEX_ISU_TEMP_FORMAT 
         [0162]    INDEX_ISU_OUTDOOR_TEMP_SENSOR 
         [0163]    INDEX_ISU_REV_VALVE_POLARITY 
         [0164]    INDEX_ISU_L_TERMINAL 
         [0165]    INDEX_ISU_AUTO_CHANGEOVER 
         [0166]    INDEX_ISU_DEADBAND 
         [0167]    INDEX_ISU_DROOP_LOCK_AUX_BACKUP_HEAT_STAGE — 1 
         [0168]    INDEX_ISU_BACKUP_HEAT_UPSTAGE_TIMER 
         [0169]    INDEX_ISU_HP_CMPR_LOCKOUT 
         [0170]    INDEX_ISU_HP_AUX_LOCKOUT 
         [0171]    INDEX_ISU_CPH_COOLS1 
         [0172]    INDEX_ISU_CPH_COOLS2 
         [0173]    INDEX_ISU_MIN_CMPR_OFF 
         [0174]    INDEX_ISU_AIR_ENABLE 
         [0175]    INDEX_ISU_MIN_COOL_SP 
         [0176]    INDEX_ISU_MAX_HEAT_SP 
         [0177]    INDEX_ISU_KEYPAD_LOCKOUT 
         [0178]    INDEX_ISU_TEMP_SENSOR_SELECTION 
         [0179]    INDEX_ISU_INDOOR_HUM_SENSOR 
         [0180]    INDEX_ISU_HUMIDIFIER1_WIRING_ASSIGNMENT 
         [0181]    INDEX_ISU_HUM_FROST_PROTECTION 
         [0182]    INDEX_ISU_HUM_SYSTEM_MODE 
         [0183]    INDEX_ISU_DEHUM_EQUIP 
         [0184]    INDEX_ISU_INDOOR_DEHUM_SENSOR 
         [0185]    INDEX_ISU_DEHUMIDIFIER_WIRING_ASSIGNMENT 
         [0186]    INDEX_ISU_DEHUM_RELAY 
         [0187]    INDEX_ISU_DEHUM_ALGORITHM 
         [0188]    INDEX_ISU_DEHUM_MAX_DROOP 
         [0189]    INDEX_ISU_DEHUM_SYSTEM_MODE 
         [0190]    INDEX_ISU_DEHUM_FAN_MODE 
         [0191]    INDEX_ISU_SOUTHERN_DEHUM_FAN 
         [0192]    INDEX_ISU_SOUTHERN_DEHUM_LOW_LIMIT 
         [0193]    INDEX_ISU_SOUTHERN_DEHUM_TEMP_SETPOINT 
         [0194]    INDEX_ISU_SOUTHERN_DEHUM_RH_SETPOINT 
         [0195]    INDEX_ISU_VENT_WIRING_ASSIGNMENT 
         [0196]    INDEX_ISU_VENT_ALGORITHM 
         [0197]    INDEX_ISU_VENT_CTRL_FAN_MODE 
         [0198]    INDEX_ISU_VENT_PERCENT_ON_TIME 
         [0199]    INDEX_ISU_VENT_LOCKOUT_TEMP_LOW 
         [0200]    INDEX_ISU_VENT_LOCKOUT_TEMP_HIGH 
         [0201]    INDEX_ISU_VENT_LOCKOUT_DEWPOINT_HIGH_VALUE 
         [0202]    INDEX_ISU_VENT_CTRL 
         [0203]    INDEX_ISU_DEHUM_VIA_VENT 
         [0204]    INDEX_ISU_SMART_HEAT_TEMP_LIMIT 
         [0205]    INDEX_ISU_SMART_COOL_TEMP_LIMIT 
         [0206]    INDEX_ISU_HOME_HEAT_SETPOINT 
         [0207]    INDEX_ISU_HOME_COOL_SETPOINT 
         [0208]    INDEX_ISU_AWAY_HEAT_SETPOINT 
         [0209]    INDEX_ISU_AWAY_COOL_SETPOINT 
         [0210]    INDEX_ISU_AWAY_MODE_SETPOINT_CHOICE 
         [0211]    INDEX_ISU_FEELS_LIKE 
         [0212]    INDEX_ISU_IDEAL_RELATIVE_HUM 
         [0213]    INDEX_ISU_FEELS_LIKE_CORRECTION 
         [0214]    INDEX_ISU_R_VALUE_HOUSE 
         [0215]    INDEX_ISU_HUM_RESET_COOL 
         [0216]    INDEX_ISU_HUM_RESET_HEAT 
         [0217]      FIG. 14  is a diagram of a state overview. “Characterizing” may occur at symbol  211  on a line  213  with an arrow to “waiting W off” at symbol  212 . Line  213  may indicate that power drops too low or “W turns off”. A line  214  from symbol  212  to symbol  211  may indicate “W turns on (not characterized)”. 
         [0218]    “Characterization complete” may be indicated on line  215  from symbol  11  to “Free to Steal” at symbol  216 . A line  217  from symbol  16  to symbol  212  may indicate “W turns off”. From symbol  212  to a symbol  218  representing “Following Characterization”, may be a line  219  indicating that “W turns on (characterized)”. “Following Characterization” at symbol  218 , “W urns off” may be indicated by a line  221  that goes from symbol  218  to symbol  212 . A line  222  indicating “Made it to final stage” may go from symbol  218  to symbol  216 . 
         [0219]    “Power too low” may be indicated by a line  223  going from symbol  218  to a symbol  224  that represents “battery charging”. When a battery is charged at symbol  224 , a line  225  indicating “Battery level high again” may go from symbol  224  to symbol  218 . A line  226  indicating a “found period to steal during [it]” may go from symbol  218  to a symbol  227  representing “On Cycle Stealing”. A line  228  indicating “Period is almost over” may go from symbol  227  to symbol  218 . Also from symbol  227  may be a line  229  indicating “W turns off” that goes from symbol  227  to symbol  212 . 
         [0220]      FIG. 15  is a flow diagram of a characterization. From a start at symbol  231 , a step to read voltage may occur at symbol  232 . A question of whether the step is up may be asked at symbol  233 . If an answer is yes, then a new step may be recorded at symbol  234 . Following waiting about one second at a symbol  235 , one may return to symbol  232  to read a voltage. 
         [0221]    If the answer to the question at step  233  is no, then a question of whether the voltage is stable may be asked at a symbol  236 . If an answer is no then, one may wait about one second after which a return to read voltage at symbol  232  may occur. If the answer is yes, then finish recording may occur at a symbol  237 . 
         [0222]      FIG. 16  is a flow diagram of an already characterized situation. From a start at symbol  241 , a step of read voltage may occur at a symbol  242 . A question of whether the voltage is too low may be asked at symbol  243 . If an answer is no, then a question whether a next period if found may be asked at a symbol  244 . If an answer is no, then a wait counter may be incremented at a symbol  245 . A question may then be asked at symbol  246  whether the wait counter is too high. If the answer is no, then an about one second wait may occur at symbol  247 . After symbol  247 , a return may be made to read a voltage at symbol  242 . 
         [0223]    If the answer to symbol  246  is yes, then a question of whether one is in a final period at symbol  248  may be asked. If an answer is no, then a failure may be declared at symbol  249 . If the answer to the question at symbol  248  is yes, then completion may be declared at symbol  250 . 
         [0224]    If the answer at symbol  244  is yes as to whether the next period is found, then if there is enough time to power steal may be noted at symbol  251  and the power steal can occur until before the next period at symbol  252 . After symbol  252 , a return to read voltage at symbol  242  may be done. 
         [0225]    If an answer to the question at symbol  243  of whether the voltage is too low is yes, then a low counter may be incremented at a symbol  253 . A question at symbol  254  of whether the low counter is too high may be asked. If an answer is yes, then an AC loss may be declared at symbol  255 . If the answer is no, then an about one second wait may occur at symbol  256 . After the wait, a return to symbol  242  to read a voltage may occur. 
         [0226]      FIG. 17  is a diagram of a graph showing s fixture&#39;s process when it is in an off state, when a thermostat&#39;s call for heat, and when the call for heat is satisfied.  FIG. 18  is a diagram of a graph where a fixture&#39;s process when it is in an off state, when the thermostat call for heat, and when the flame sense is not turned on.  FIG. 19  is a diagram of a graph showing an area of purge, an igniter, a gas valve on, and a hold of the gas valve.  FIG. 20  is a diagram of a graph of a power steal, an activity of a wax motor valve operation.  FIG. 21  is a diagram of a graph of an AC version of a waveform with certain events indicated along the waveform.  FIG. 22  is a diagram of a graph of a magnified portion of an AC version showing a signal&#39;s shape. 
         [0227]    To recap, an approach for power transformation may incorporate providing a rectifier having a first input terminal for connection to a first terminal of a power source, second input terminal for connection to a first terminal of a first load, and having first and second output terminals, connecting an input of a first current source to the first output terminal of the rectifier, connecting an output of the first current source to the second output terminal of the rectifier, connecting an input of a second current source to the first output terminal of the rectifier, connecting an output of the second current source to a first terminal of an ultra capacitor, and connecting a second terminal of the ultra capacitor to the second output terminal of the rectifier. 
         [0228]    The first load may have a second terminal for connection to a second terminal of the power source. The first current source may have a control terminal. An amount of current through the first current source may be adjustable from zero to 100 percent of current available to the first current source from the rectifier, according to a signal to the control terminal. An amount of current available for the second current source may be the current available to the first current source minus the amount of current to the first current source. Current from the second current source, if any or all, may go to the ultra capacitor and/or a mechanism connected in parallel with the ultra capacitor. 
         [0229]    The approach may further incorporate providing a mechanism for determining a magnitude of voltage between the first and second output terminals of the rectifier to determine a magnitude of voltage appropriate for entering a state of harvesting energy. 
         [0230]    The approach may further incorporate providing a mechanism for determining magnitude of voltage between an input of the second current source and the second output of the rectifier to determine if the first current source is out of saturation, and if out saturation an extent of being out of saturation. 
         [0231]    The ultra capacitor may have a capacitance ranging from 0.2 to 200 farads. 
         [0232]    The approach may further incorporate adjusting a current from the second current source to the ultra capacitor according to a range selection by a signal to a control terminal of the second current source. The signal to the control terminal of the first current source may be provided by a controller. The signal to a control terminal of the second current source may be provided by the controller. 
         [0233]    The approach may further incorporate adding current from a battery to the ultra capacitor and/or the mechanism. 
         [0234]    The approach may further incorporate adding current from one or more electrical sources to the mechanism. 
         [0235]    The approach may further incorporate adding current from a from first and second output terminals of a buck converter to the mechanism. The buck converter may have first and second input terminals connected to first and second output terminals, respectively, of a second rectifier. The second rectifier may have first and second terminals for connection to the first and second terminals, respectively, of the power source. 
         [0236]    The approach may further incorporate disconnecting and connecting the first load directly and indirectly across the power source with a switch arrangement. The switch arrangement comprises a first switch connected between the first terminal of the first load and the first terminal of the power source, and a second switch connected between the first terminal of the first load and the second input terminal of the rectifier. 
         [0237]    The approach may further incorporate connecting a first terminal of one or more additional loads to the second input terminal of the rectifier and a second terminal to a second terminal of the power source, and disconnecting and connecting the one or more additional loads directly and indirectly across the first and second terminals of the power source with a second switch arrangement. The second switch arrangement may incorporate a third switch connected between the first terminal of the second load to the first terminal of the power source and a fourth switch connected between the first terminal of the one or more additional loads and the second input of the rectifier. The fourth switch may be closed and the third switch may be opened. The second switch may be closed and the first switch may be opened. Current may be available to the rectifier via the first load and the one or more additional loads. 
         [0238]    The approach may further incorporate connecting a current measuring device at the output of the first current source, connecting a voltage measuring device across the first and second output terminals of the rectifier, calculating an impedance of the first load from measurements from the current and voltage measuring devices, and adding or removing a capacitance across the first and second output terminals of the rectifier and/or adjusting current flow through the first current source according to the impedance. 
         [0239]    A power transformation circuit may incorporate a rectifier having a first input for connection to a first terminal of a power supply, a second input for connection to a first terminal of a first load, a first output, and a second output connected to a reference terminal, a first current source having an input connected to the first output of the rectifier and having an output connected to the reference terminal, a second current source having an input connected to the first output of the rectifier, and an ultra capacitor having a first terminal connected to an output of the second current source and a second terminal connected to the reference terminal. 
         [0240]    The first load may have a second terminal for connection to a second terminal of the power supply. The first and second terminals of the ultra capacitor may be for providing current to a device. 
         [0241]    The first current source may have a control terminal for a signal to adjust an amount of current flowing from the input to the output of the first current source. The first current source may conduct virtually all of the current available from the rectifier. Current from the second current source may be adjustable at the second current source for charging the ultra capacitor. 
         [0242]    The current flow of the first current source may be adjustable from virtually zero percent to 100 percent of the current available to the first current source, according to a signal to the control terminal of the first current source. 
         [0243]    The amount of current available to the second current source is an amount of the current available to the first current source minus an amount of current flowing through the first current source. At least a portion of the current provided to the second current source may be stored as a charge at the capacitor. An amount of current provided to the second current source may be provided to the device having a first terminal for connection to the first terminal of the capacitor and a second terminal for connection to the second terminal of the capacitor. 
         [0244]    The circuit may further incorporate a first switch for connection or disconnection of a connection between the first terminal of the first load and the second input of the rectifier, and a second switch for connection or disconnection of a connection between the first terminal of the load and the first terminal of the power supply. 
         [0245]    If the second switch is on, then the first switch should be on before the second switch is turned off. If the first switch is on, then the second switch should be on before the first switch is turned off. 
         [0246]    A power transformation system may incorporate a rectifier having a first input connected to a first terminal of a power source, a second input connected to a first terminal of a load, a first output, and a second output connected to a reference terminal; a first current source having a first terminal connected to the first output of the rectifier, and a second terminal connected to the reference terminal; a second current source having a first terminal connected to the first output of the rectifier, and a second terminal; and an ultra capacitor having a first terminal connected to the second terminal of the second current source, and a second terminal connected to the reference terminal. 
         [0247]    A second terminal of the load may be connected to a second terminal of the power source. The first current source may incorporate a first state of conduction, and a second state of conduction. The first state of conduction of the first current source may be when the first current source conducts virtually all of the current available to the first current source. The second state of conduction may be when the first current source conducts a first portion of virtually all of the current available to the first current source. A second portion of virtually all of the current available to the first current source may be conducted by the second current source to the ultra capacitor and/or a device. 
         [0248]    The system may further incorporate a switch connected between the first output of the rectifier and the first terminal of the second current source. The second current source provides current to the ultra capacitor. When the ultra capacitor is charged to a predetermined value, a controller receives a value indication from the first terminal of the ultra capacitor, and provides a signal to the switch to disconnect the first terminal of the second current source from the first output of the rectifier, or to reduce an amount of current to the ultra capacitor. 
         [0249]    The system may further incorporate a first switch connecting the first terminal of the load to the first terminal of the power source. When the first switch is turned on to establish a connection between the first terminal of the load and the first terminal of the power source, current may be routed away from the rectifier and consequently reduces an amount of current available to the first current source. 
         [0250]    In the present specification, some of the matter may be of a hypothetical or prophetic nature although stated in another manner or tense. 
         [0251]    Although the present system and/or approach has been described with respect to at least one illustrative example, many variations and modifications will become apparent to those skilled in the art upon reading the specification. It is therefore the intention that the appended claims be interpreted as broadly as possible in view of the related art to include all such variations and modifications.