Abstract:
A programmable burner for gas stoves, which is constituted by a gas burner and a safety valve that includes a thermocouple, which is located in coincidence with an external edge of the burner. The safety valve is maintained open when the thermocouple is detecting the presence of a flame on the gas burner and is closed when the burner has been turned off. An electrode is placed near of the external periphery of the burner for igniting. A spark generation module is connected with the electrode for generating the sparks for igniting the burner. A spark interrupter is connected to the spark generation module, the spark interrupter being located over a burner knob that is connected to the safety valve, for activating or deactivating the spark generation of the spark generation module. Finally a programmable device is connected with the thermocouple and the security valve, for programming the ignition time of the burner in accordance with a preestablished operation time by user.

Description:
FIELD OF INVENTION  
         [0001]    The present invention is referred to a programmable gas burner for gas stoves, and more particularly to a burner for gas stoves which is possible to program in accordance with to a pre-established operation time chosen by the user.  
         BACKGROUND OF THE INVENTION  
         [0002]    The typical system to ignite oven burners of stoves that use gas mainly includes to partially turn on a gas valve to leave gas through a pilot burner and to ignite the pilot burner manually with a lighted match or by means or a manual electric igniter. Once the pilot burner is ignited, the gas valve is completely open in order to ignite the burner of the oven.  
           [0003]    However, one of the main problems of the typical system is that, sometimes, the main burner does not ignite, whether the pilot burner is turned off at the moment that the burner is ignited or by air flows, which results in an accumulation of gas in that area, and this could cause the user to immediately close the valve. In this manner, once the user would try again to light the oven, he would have ventilate the area so as to disperse the gas that might have accumulated, thus preventing a possible explosion.  
           [0004]    At the present, there are some ignition systems for the ignition of gas burners that use an electronic ignition system. For example, U.S. Pat. No. 3,914,092 assigned to Johnson Service Controls it is referred to a direct spark ignition system for generating ignition sparks for igniting fuel discharged by a fuel outlet.  
           [0005]    Another system for controlling a pilot burner and main gas valves of gas furnace is shown in U.S. Pat. No. 3,986,813 assigned to the Cam-Stat Incorporated company, including a pilot spark igniter and a pilot flame sensor. This system includes a relay having a first standby mode providing power to a spark igniting circuit so that, when the thermostat switch is closed, a pilot valve solenoid is energized, and in a second operating mode disconnecting power from the power from the spark ignition circuit and providing power to the main valve solenoid when the flame is sensed at the pilot burner. The system is provided with a fast responding circuit for operating the relay utilizing a 24 volts supply, with a 48 volts supply provided only for the flame sensor.  
           [0006]    Other arrangements of gas burners that already use electronic ignition systems to operate are described and claimed in U.S. Pat. Nos. 4,055,164, 4,082,493, 4,111,639 and 4,194,875, all of them related to control systems for the automatic ignition of the burners. However, in all the cases, these are referred for controlling the pilot and the main burner gas valves (U.S. Pat. Nos. 4,082,493 and 4,194,875); for controlling the ignition of an auxiliary fire nozzle and a main fire nozzle in a water heater (U.S. Pat. No. 4,055,164); or to a self-checking fuel ignition system, which effects periodic testing of the operability of the spark-generation circuit.  
           [0007]    Taking into account the previous art, the present invention refers to a programmable burner for gas stoves, which can be programmed in keeping with operation times established by the user. Under this scheme, there already are some systems that were developed and are related to systems used to control gas burners, for example, the U.S. Pat. No. 4,318,687 assigned to the Inoue-Japax Research Incorporated company is claiming a burner system of the type in which a thermocouple or like EMF-generating sensor detects the presence of a pilot flame and controls a main fuel valve to hold the latter open as long as the pilot flame remains lit. According to the invention, the main valve is held open by a solenoid and a resistor is provided in circuit between the sensor and the solenoid to reduce the response time of the latter which results from the inductance contributed by the magnetic coil forming the solenoid.  
           [0008]    Another development that is related to gas stoves is described in U.S. Pat. No. 4,830,602, assigned to Cramer GmbH, which is related to a gas range with at least one burner covered by a glass ceramic plate, wherein the burner has a gas cock and a timed-ignition and monitoring device, such that the output of the burners is adjustable. A gas cock is used with plugs rotatable between a high and a low position with the aid of a knob and a knob shaft, with a spindle connected to the knob shaft, with a valve plate under the gas inlet opening in the plug housing, with a microswitch for the ignition device and with the use of an electromagnet under the valve plate, in the area of the gas supply connection of the further housing. The knob with the knob handle and the spindle is pressable against the action of a return spring in the high position of the plug. This way, the microswitch for the timed ignition device becomes actuatable and the valve plate becomes pressable on the electromagnet against the action of a return spring, thereby opening the combustion gas inlet opening. The monitoring device has thermoelement reaching deeply into the flame of the burner, which generates a thermal current after maximum 10 sec., feeding the electromagnet and holding the valve plate. The design of the thermoelement and of the electromagnet are such that the electromagnet releases the valve plate and interrupts the gas supply when the flame of the burner is interrupted for up to 60 seconds or for more than 60 seconds.  
           [0009]    Finally, U.S. Pat. No. 5,094,259, assigned to Chung-Hsiung Hsu, refers to an automatic shut-off device for a gas stove, and more particularly, a safety valve control device that can be retrofitted between the gas inlet pipe and the catch base of the stove. The device includes a coupling such that operation of the knob of the gas stove at the time operates the circuit of a gas safety valve control device. This operation causes the forward movement of a function shaft of the gas safety valve device and opens the gas intake valve to supply the gas to the stove burner. The function shaft is also subject to the control by an electromagnetic control rod to maintain the open state of the gas intake valve. In case the fire goes out accidently, the circuit device energizes an electromagnetic coil to attract upwardly an electromagnetic control rod, thereby disconnecting the function shaft, which is spring loaded, and which in turn operates the gas intake valve. This action thus disconnects the gas supply to the stove. Also, if the cooking time is too long, and the fire does not go out (e.g., one forgets to turn off the gas) or the gas at the stove burner can not be ignited within the given time, the device will also shut off automatically the gas intake valve.  
         SUMMARY OF THE INVENTION  
         [0010]    As can been seen from the above, the previously described devices are related with safety devices that automatically close the valve of a gas stove and maintain the valve open through the use of an electric magnet that maintains the seal of an opening/closure retracted by means of a current that is provided by a the stated electromagnet&#39;s thermocouple.  
           [0011]    However, none of the devices is related with a programmable burner wherein the user could establish a predetermined operation time. The programmable burner of the present invention includes an arrangement formed by a safety valve, a thermocouple located in conjunction with the external edge of the burner. Said safety valve is maintained open by the detection of the presence of a flame on the gas burner. An electrode is placed close to and in conjunction with the burner for igniting. A spark generation module is connected to the electrode that generates the sparks that are necessary for igniting the burner. A spark interrupter is connected to the spark generation module, with the spark interrupter placed over the burner knob that is connected to the safety valve, which, at the moment of igniting the stove&#39;s burner, activates the spark generation module, generating the sparks that are necessary for igniting the burner. A clock that includes a time-measuring function in a regressive countdown, is connected to the thermocouple and to the safety valve in order to program the igniting time of the burner with a pre-programmed time; and an interrupter connected to the clock, the safety valve and the thermocouple in order to permit the burner to function for a programmed time or continuously as a normal burner, without having to program an operation time.  
         OBJECTIVES OF THE INVENTION  
         [0012]    Therefore, a first objective of the present invention is to provide a programmable burner for gas stoves through which the user can establish the burner&#39;s operation time under a pre-determined period of time.  
           [0013]    An additional objective of the present invention is to provide a programmable burner for gas stoves that uses a clock that includes a time-measuring function in a regressive time countdown (chronometer) and a safety valve that is maintained open through a thermocouple.  
           [0014]    An additional objective of the present invention is to provide a programmable burner for gas stoves that permits the function of a burner for a programmed time or continuously as a normal burner, without having to program its operation time.  
           [0015]    These and other objectives and additional advantages of the present invention will become evident to those who are experts in the field in the following detailed description of the invention, which will be made with reference to a specific embodiment in an illustrative but not limiting manner for said invention.  
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0016]    [0016]FIG. 1 shows a schematic drawing of the programmable burner arrangement for gas stoves, in accordance with the present invention;  
         [0017]    [0017]FIG. 2 shows a second embodiment of the programmable burner for gas stoves;  
         [0018]    [0018]FIG. 3 shows a block diagram of the electronic clock for programming the programmable burner of the present invention;  
         [0019]    [0019]FIG. 4 is an electric diagram that shows a first embodiment of the circuit used to program the burner of the present invention;  
         [0020]    [0020]FIG. 5 shows an electric diagram showing a second embodiment of the circuit for programming the burner of the present invention; and,  
         [0021]    [0021]FIG. 6 is an electric diagram showing a third embodiment of the circuit for programming the burner of the present invention. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0022]    Now making particular reference to FIG. 1, a description of the gas stove programmable burner that includes the following parts: a burner  10 , that has a gas-feeding pipe  12 , that is connected by its lower part, to supply the gas that is necessary for igniting it. A first end of the feeding pipe  12 , is connected to a safety valve  14 , to permit or prevent the flow of gas towards the burner  10 , its second end of said feeding pipe  12 , is connected to the burner  10 . The valve  14 , includes, additionally a gas entry  16 , which itself is connected to a distribution pipe of a gas stove (not shown). A thermocouple  18 , is placed in coincidence with the external edge of burner  10 , which remains inside the flame of the burner  10 , when the latter is ignited. The thermocouple  18 , is connected by a first line  20 , of the safety valve  14 , and by a second line  22 , that is connected to a clock  24 , that is used for programming the ignition time of the burner  10 , with a pre-established time determined by the user. The circuit is closed when the clock  24  is connected with a safety valve  14  by means a third line  26 . An electrode  28 , is placed nearby and in coincidence with the burner  10 , for its ignition, which itself is connected by means of a fourth line  30 , to a spark generation module  32 , and thus generates the sparks that are necessary for igniting the burner. A spark interrupter  34 , is coupled to a shaft  36 , of the safety valve  14 , that is used to activate the spark generation module  32 , during the ignition of the burner  10 , of the stove (not shown), thus generating the sparks that are necessary for igniting said burner  10 . The sparks interrupter  34 , is connected by means of a fifth line  38 , to the spark generation module  32 .  
         [0023]    An interrupter  40 , is connected in parallel through a sixth line  42 , and a seventh line  44 , to lines  22  and  26  of the clock  24 , to permit during its open position, that the burner  10 , may function under a programmed time or so that, in its closed position, the burner  10 , may function in a continuous manner as a normal burner.  
         [0024]    Even though the valve  14 , is included within the total context of the present invention, this valve  14 , is of a commercial type, and it will be described only to obtain a greater comprehension of the programmable burner of the present invention. The valve  14 , includes a safety system at its exit, which prevents the flow of gas from the gas feed pipe  12 , to the burner  10 , by means of a seal  46 , that makes contact with the shaft  48 , of the valve  14 , on the one side of the seal  46 , and on the other side of it, installed in a counter position, is found a spring  50 , that keeps it obstructing the gas flow.  
         [0025]    In order to igniting the burner  10 , the shaft  48 , is pushed towards the valve  14 , turning it to the left in order to adjust the height of the flame that is desired. At the same time, the shaft  48 , pushes the seal  46 , which will keep the orifice closed, permitting the flow of the gas feeding pipe  12 , to the burner  10 . At the moment that the shaft  48 , of the valve  14 , is turned on, the spark interrupter  34 , closes and the spark generation module  32 , is energized to generate sparks which are delivered by means of a spark plug  28 , towards the burner  10 , thus igniting the burner  10 , so as to normalize the flame.  
         [0026]    So, when the seal  46  of the valve  14  is pushed by the shaft  48  of the valve  14 , the seal  46 , pushes a metallic disc  42 , through a pivot. The disc  42 , is found on the other end of the pivot, and it is thus taken up to an electric magnet  54 , which includes a solenoid  56 , that is energized by the thermocouple  18 , that generates electric current when it is immersed in the flame of the burner  10 . In this manner the electro magnet  54 , generates a magnetic field, which holds a metallic disc  52 , thus maintaining the pressure seal  46 , in the retracted position, thus permitting the flow of gas towards the burner  10 . For the seal  46 , to be maintained in its open position, it is necessary that the thermocouple&#39;s signal  18 , be completely established so as to energize the solenoid  56 , with sufficient current in order to hold the metallic disc  52  in place. In order to do this, it is necessary to wait from 3 to 5 seconds, pushing the shaft  48  of the valve  14 , until the seal  46 , is completely held in its retracted position.  
         [0027]    The thermocouple  18 , that is connected to the connector  58 , of the solenoid  56 , of the valve  14 , by means of the conductors  20 , but interrupting the conductor  22 , by means of a relay  60 , which interrupts the signal of the thermocouple  18 , when the programmed time of the clock  24 , ends. In this manner, the operation time of the burner  10  is controlled, since that the signal of the thermocouple  18  is interrupted and the safety valve  14  is closed by means of spring  50 , over the seal  46 .  
         [0028]    The relay  60 , is normally found open, so that upon programming the time of operation the relay  60 , closes, thus permitting the ignition of burner  10 . When the programmed time ends, the relay  60 , opens, preventing the transfer of current to the thermocouple  18 , to the solenoid  56 , of the valve  14 , thus closing the gas flow. After the supply of gas to the gas burner  10 , has been disconnected, the shaft  48  of the valve  14 , will have to return to its closed position in order to leave it ready for another operation.  
         [0029]    The interrupter  40 , will permit the burner  10 , to be utilized with programmed time or as a burner that functions continuously as any other non-programmable burner that can be ignited at any moment when opening the valve  14 . Thus, when interrupter  40 , is closed, the burner  10 , functions as a burner without any time of operation (it operates at any time without the need to program its operation time) and, when the interrupter  40 , is open, the burner  10 , functions as a programmable burner during its time of operation.  
         [0030]    Now making a particular reference to FIG. 2, a second embodiment of the present invention is presented, wherein the interrupter  40 , is eliminated, and a relay K 1 , is maintained, and this relay is normally closed and includes an electronic circuit  62 , that is connected to said relay K 1 .  
         [0031]    The use of a normally closed relay K 1 , permits the operation of the burner  10 , with or without programmed time i.e., the burner  10 , can be operated in a continuous form without any limitation of time, or it can be operated with a programmed time of operation so that it disconnects the circuit of the thermocouple signal  18 , at the end of the period of the programmed function.  
         [0032]    In this manner the electronic circuit  62 , once the programmed time has ended, generates a pulse which opens the relay K 1 , thus preventing the passing of the current to the thermocouple  18 , to the solenoid  56 , of the valve  14 , this manner the seal  46 , is freed and consequently closes the gas flow to the burner  10 . The disconnecting of the current to the thermocouple  18 , by means of the relay K 1 , is for a short time, long enough to liberate the seal  46 , and leave the relay K 1  closed again, which permits again the re-operation of the burner  10 .  
         [0033]    [0033]FIG. 3 shows to the clock  24  represented in a block diagram, which includes a controller  64 , a numbers display  66 , a keyboard for programming the micro display  68 , a buzzer  70 , for indicating the termination of the programmed time and an electronic circuit  62 , for operating the burner  10 , at any moment (without programming it for time), or programming the time to provide an operation period of the burner  10 . An important function of the electronic circuit  62 , is when the voltage supply of the clock  24 , is disconnected, the electronic circuit  62  generates the signal that is necessary for opening the relay K 1 , and in this manner turns off the burner  10 , and prevents an erroneous time programming due to a voltage supply failure.  
         [0034]    [0034]FIGS. 4, 5, and  6  show diverse embodiments of the electronic circuit  62 , in order to implement it with the programmable burner of the present invention.  
         [0035]    In a general manner, the electronic circuit  62 , includes the following: a circuit for voltage backup CRV, connected to the feeding voltage VCC, of the clock  24 , in order to store sufficient energy when there is a power failure and to be able to activate a relay operating circuit (CMR); the relay operating circuit (CMR) being utilized to open or close the thermocouple  18 ; a control signal conditioning circuit (CASC) receives the controlled signal that arrives to the micro controller  64 , in order to control the relay operating circuit (CMR) in a logical manner.  
         [0036]    The electronic circuit  62  includes, additionally, a monitoring circuit of relay (CMMR) that monitors the relay operating circuit (CMR) for the operation of thermocouple  18 .  
         [0037]    First Emobodiment of the Electronic Circuit ( 62 )  
         [0038]    Now, making particular reference to FIG. 4, a first embodiment of the electronic circuit  62 , is shown; it operates two control signals that originate from the micro controller  64 .  
         [0039]    When the user selects the time operation programming of the burner  10 , the signal SLEEP IN is activated by the microprocessor  64 . This signal directly polarizes the transistor Q 102  through the diode DY and a resistor RY, that are connected in a series that permits the flow of current from the transistor Q 102  to a ground  74 . An exit line  74 , of the transistor Q 102  is connected to a ground  76  and the other exit line  78 , of the transistor Q 102  is connected to one of the exit lines of the transistor Q 101 .  
         [0040]    The signal SLEEP is activated by the micro controller  64 , at the time the regressive countdown of the operation time of the burner  10 , starts, and this permits the transistor Q 101 , to be activated through the diode DX, and the resistor RX, that are connected in a series.  
         [0041]    When both two signals SLEEP IN and SLEEP are activated in this circuit, to select the programming time and to start the regressive countdown, the circuit is prepared to generate a pulse that activates the coil of the relay K 1 . Because of this, both of these signals act under an function “AND”, generated by the transistors Q 101  and Q 102 .  
         [0042]    The exit line  80 , of the transistor Q 101  is connected in a series with another resistor R 101 , which itself is connected to the current feeding line  82 , that comes from the clock  24 , through the voltage VCC.  
         [0043]    A line  84 , is connected between the transistor Q 101  and the resistor R 101 , which is divided into line  86 , and line  88 . A resistor R 102 , is connected in a series with line  88 , which itself is connected to the transistor Q 103 . Line  86  is connected, in a series, to a resistor R 100 , which itself is connected to the transistor Q 104 .  
         [0044]    With respect to the transistor Q 103 , an exit line  90 , is connected to the current feeding line  82 , and the other exit line  92 , is connected, in a series, with a resistor, R 103 , and a capacitor C 111 , both of which are connected to a ground  94 . Between the resistor R 103 , and the capacitor C 111 , the line  96  is connected in a series with resistor R 104 , which itself is connected to an exit line  98 , of transistor Q 104 . The other exit line  100  is connected to the base  102  of the transistor Q 105 . Again, a first exit line  104 , of transistor Q 105 , is connected to ground line  106 , while the other exit line  108 , is connected to relay K 1 . A diode DR, is connected in parallel to the coil of the relay K 1  through lines  110  and  112 . The line  112  itself is connected to the current feeding line  82 . The diode DR is utilized to discharge the coil of the relay K 1 , when its energy is removed through the transistor Q 105 . Circuit  62  shows a first connector VALVE 1 , which is connected to line  26  of valve  14 , and a second connector VALVE 2 , that is connected to line  22  of the thermocouple  18 . The dotted line LP, represents the contacts that activate or disconnect the relay K 1 .  
         [0045]    In this manner, when transistors Q 101  and Q 102  are activated, resistors R 101 , R 102  and R 100  are grounded. Resistor  101  provides polarization current to transistors Ql 01  and Q 102  for their operation upon being grounded. When R 102  is grounded, transistor Q 103  is directly polarized, charging capacitor C 111 , through resistor R 103 .  
         [0046]    At the same time, when resistor R 100  is grounded, transistor Q 104  is maintained open (in cut) thus preventing the discharge of capacitor C 111  of the resistor R 104  towards the transistor Q 105 , and consequently this transistor Q 105 , is maintained open, preventing the activation of the relay K 1 , which is maintained in its normally closed position, permitting the passage of the current from thermocouple  18 , towards solenoid  56 .  
         [0047]    When the regressive countdown comes to zero, the signal SLEEP is disconnected, and therefore this transistor Q 101  opens. This results in the ground line disconnection of resistor R 100  directly polarizing transistor Q 104 , through resistors R 101  and R 100 , that closes, discharging the capacitor C 111  through resistor R 104  towards transistor Q 105 , which is directly polarized, closing and permitting the activation of the relay K 1 .  
         [0048]    When the relay K 1  is activated, the passage of current of the thermocouple  18 , towards the solenoid  56 , of valve  14  is impeded, closing the passage of current and therefore the passage of gas.  
         [0049]    The disconnection of the current that goes to the thermocouple  18 , is only momentary, since the capacitor C 111  has a discharge time, which arrives at a zero voltage, thus not polarizing the transistor Q 105 . Therefore, transistor Q 105  is opened and the relay K 1  is disconnected, leaving, again, the thermocouple  18 , in the conduction position.  
         [0050]    In the same way, when the programming time of the clock  24  is cancelled, the signal SLEEP IN is deactivated, provoking the same effect produced by the signal SLEEP when it is deactivated, thus energizing the relay K 1  for an instant and opening the passage of current from the thermocouple  18 , to the solenoid  56  of valve  14 .  
         [0051]    The electronic circuit,  62 , in accordance with this first embodiment is coupled to the feeding voltage VCC of clock  24 , by means of resistor R 112  and a diode DP, which charge capacitor C 110 . The resistor R 112 , limits the current in order not to charge the capacitor C 110 , in a rapid manner and in order not to damage the voltage supply VCC.  
         [0052]    When the feeding power for the clock  24 , that generates the voltage VCC is interrupted, the voltage VCC drops to 0 volts. However, the voltage VCC 1  provided by the capacitor C 110  does not drop because it is prevented by the diode DP. This capacitor C 110 , is connected to a ground line  114 , through line  116 .  
         [0053]    When the voltage VCC that goes to the clock  24 , drops to 0 volts, the signals SLEEP and SLEEP IN are also deactivated provoking the same effect produced by the signals SLEEP or SLEEP IN when they are deactivated in a normal manner, energizing the relay K 1 , for an instant and opening the current of the thermocouple  18 , to the solenoid  56  of valve  14 .  
         [0054]    This permits that when there is an involuntary power failure in clock  24 , —which is already programmed—and the programming time is lost, there is not enough current for the activation of the relay K 1  even if the clock  24 , is not energized, since the capacitor, C 110 , would provide it, thus preventing an erroneous programming time.  
         [0055]    When the feeding of power to the clock  24 , that generates the current VCC is disconnected, the voltage VCC drops or goes down to 0 volts; however, the VCC 1  voltage that is provided by the capacitor C 110  does not, since the latter is being prevented by the diode DP.  
         [0056]    Second Embodiment of the Electronic Circuit ( 62 )  
         [0057]    The circuit  62  of the second embodiment as is illustrated in FIG. 5, also handles two control signals, which are originated from the micro controller  64  of the clock  24 .  
         [0058]    In this case, the signal SLEEP IN is activated by the micro controller  64 , when the user selects the operation time programming of the burner  10 .  
         [0059]    For this embodiment, the circuit  62  is constituted by a line  118 , which receives the signal SLEEP, and it is connected to an inverter U 2 D. A resistor R 14  is connected between the entry signal SLEEP and the inverter U 2 D through line  119 , which itself is connected to ground  121 . From the inverter U 2 , line  120  comes out, and is connected to the exit of the diode D 19  in order to polarize it inversely. The entry connection of the diode D 19  is connected to line  122 , which divides into two lines  124  and  126 . A resistor R 13 , is connected in a series to line  124 , which itself is connected through line  128  to the power feeding line  130 . On the other hand, line  126 , is connected in a series with the capacitor C 10 , which is connected, at a point PA, that coincides with line  132  of the signal SLEEP IN. The point PA is connected in a series with a diode D 16 , which itself is connected to ground  134 .  
         [0060]    Line  126  is connected in a series with a diode D 16 , which itself is connected to a ground  134 .  
         [0061]    Line  132  of the signal SLEEP IN is connected in a series with a first diode D 13 , polarizing the diode D 13  inversely, thus permitting the point PA to float. A second diode D 15  is connected in a series with the diode D 13 , through line  136 . The exit of diode D 15  is connected through line  138  to the base of the transistor Q 3 , in order to directly polarize said transistor Q 3 . Between diode D 15 , and the transistor Q 3 , line  140  is connected in parallel, and this line is connected to a resistor R 16 , which, through a signal RET directly polarizes the transistor Q 3 . An exit  142 , of the transistor Q 3  is connected to a ground  144 , and the other exit  146 , is connected through line  148 , to the relay K 1  and interrupts the current of thermocouple  18 .  
         [0062]    As in the first embodiment, a diode D 14 , is connected in parallel to the coil of the relay K 1  through lines  150  and  152 . Line  152  is itself, connected to power feeding line  130 . Diode D 14  is utilized for discharging the coil of the relay K 1  that is de-energized through the transistor Q 3 . Circuit  62  shows a first connector VALVE 1  which is connected to line  26  of the valve  14 , and a second connector VALVE 2  which is connected with line  22  of the thermocouple  18 . The dotted line LP represents the contacts that activate or deactivate the relay K 1 .  
         [0063]    Circuit  62  is connected to the feeding voltage VCC through line  130  to the resistor R 12  and to diode D 11  which charges a capacitor C 7 , which stores sufficient energy to activate the relay K 1  for a moment and to disconnect the current that comes from the thermocouple  18 , turning off the burner  10 , when the energy that feeds clock  24  is disconnected. A line  154 , that is connected in parallel with line  130 , and said line  154  includes, in a series, the diode D 12 , the resistor R 15 , to be finally connected to the transistor Q 4 . A capacitor C 9 , is connected in parallel with the resistor  15 .  
         [0064]    The first exit  156  of transistor Q 4  is connected with line  130 . Through the other exit  158 , of the transistor Q 4 , the signal RET is generated and it directly polarizes the transistor Q 3 . A capacitor C 8  that is connected by means of line  160 , generates the signal RET so that the transistor Q 3  is polarized through the resistor R 16 . The capacitor C 8  is connected to a ground  162 , through line  164 .  
         [0065]    In this manner, when the programming time of the clock  14 , has not been selected, the signal SLEEP IN activates the diode D 13 , thus causing the point PA of the circuit to be found virtually connected to ground. This causes the transistor Q 3  not to be polarized because its base it is connected to ground.  
         [0066]    On the other hand, when the programming of time in the clock  14 , has been selected, the signal SLEEP IN carries the voltage VCC to diode  13 , polarizing it inversely, allowing the point PA to float.  
         [0067]    When the point PA floats, the capacitor C 10  may be charged through the resistor  13 , and by means of the diode D 15  in order to directly polarize the transistor Q 3  to energize the relay K 1  and interrupt the current of thermocouple  18 , that feeds the solenoid  56  of valve  14 , turning off burner  10 .  
         [0068]    At the moment that the programming time for the burner  10  is selected, at clock  24 , the signal SLEEP IN is activated permitting the point PA to float, as was previously was described. At the same time, the signal SLEEP is activated causing the inverter U 2 D (that can also be a transistor or electronic interrupter) to have an exit to ground and thus polarize the diode D 19  directly, preventing the charge to the capacitor C 10 , since it is short circuited through diode D 19 , the inverter U 2 D, the diode D 16  and ground, preventing the direct polarization of transistor Q 3 , which does not energize the relay K 1 .  
         [0069]    When regressive count down reaches zero, the signal SLEEP is deactivated, causing the inverter U 2 D to exit to a voltage level VCC 1 , which inversely polarizes the diode D 19 .  
         [0070]    This permits the capacitor C 10 , to be charged through resistor R 13 , diode D 15  and transistor Q 3 , with the transistor Q 3  directly polarized in order to energize the relay K 1  and interrupt the current to thermocouple  5 , turning off the burner  10 .  
         [0071]    The relay K 1  will be activated only during the charge time of capacitor C 10 , the relay K 1  being deactivated after this time, leaving burner  10  capable of be ignited again.  
         [0072]    In the same manner of embodiment 1, the circuit of embodiment 2 is connected to the feed voltage VCC through the resistor R 12  and a diode D 11  that charges a capacitor C 7 , which stores sufficient energy to activate the relay K 1  for a moment and disconnect the current at the thermocouple  18 , turning off the burner  10  when the current that energizes clock  24  is disconnected.  
         [0073]    When this happens, the transistor Q 4  is directly polarized through the resistor R 15 , the capacitor C 9  and the diode D 12 , which is directly polarized due to the fact that the feed voltage VCC of clock  14  is less than the voltage VCC 1 .  
         [0074]    In this condition the transistor Q 4 , which is in the status of conduction, provides power to the capacitor C 8 , which on its own, generates the signal RET so that the transistor Q 3  is directly polarized through the resistor R 16 , directly conducting it and permitting the activation of the relay K 1 , turning off the burner  10 . At the same time, the signal RET is connected to the clock circuit (not shown) to indicate that a power failure has taken place.  
         [0075]    Third Embodiment of the Electronic Circuit ( 62 )  
         [0076]    In the third embodiment of the circuit  62  (FIG. 6), a control signal that comes from the micro controller  64  of clock  24  is activated, and it generates another signal towards the micro controller  64 .  
         [0077]    In this case, the circuit  62  generates a signal PRGN which is sent through line  166 , and a resistor RN, which is connected in a series. The base of the transistor QN is connected in a series with the resistor RN. An exit line  168 , of the transistor QN is connected to a ground  170 . The other exit line  172 , is connected to the relay K 1 . From line  172 , line  174  is derived to take it through the point PN to ground. Line  174  also includes the resistor RN 2  to obtain a signal MON through line  176 , which is taken to the micro controller  64  to indicate that the transistor QN functions correctly. A diode DN 2  is connected in parallel to the relay K 1  through lines  178  and  180 . Line  180  is itself connected with the power feeding line  182 . The diode DN 2  is utilized for discharging the coil of the relay K 1  when it is de-energized through the transistor QN. Circuit  62  shows a first connector VALVE 1 , which is connected to line  26  of valve  14 , and, a second connector VALVE 2  that is connected to line  22  of the thermocouple  18 . The dotted line LP, represents the contacts, which activate or deactivate the relay K 1 . A resistor RN 1  is connected in parallel between the feeding line  182  and line  166 , which serves as a support for polarizing the transistor QN.  
         [0078]    Through this embodiment the signal PRGN is activated by the micro controller  64  when the programmed time of operation of burner  10  has arrived at zero, which directly polarizes the transistor QN through the resistors RN and RN 1 , which energizes the relay K 1  interrupting the current to thermocouple  18  and closing the burner  10  during a time defined in the programming of the micro controller  64 .  
         [0079]    The signal MON is obtained from the transistor QN and from the resistor RN 2  and it is taken to the micro controller  64  to indicate that the transistor QN functions correctly. That is to say, when the micro controller  64  generates the disconnecting pulse of the thermocouple  18 , the transistor QN goes into the conduction status taking the point PN to ground. When the signal MON is connected to the point PN, the micro controller  64  will detect that the transistor QN was correctly polarized and connected the point PN to ground. If this does not take place, the micro controller  64  will generate an error signal to indicate that this transistor QN does not function correctly.  
         [0080]    In this third embodiment, circuit  62  is connected to the feed voltage VCC of clock  24  through the resistor R 1 N and the diode DN, charging the capacitor CN, which stores sufficient charge for feeding the relay K 1  if the feeding power VCC of the clock  24 , disconnects.  
         [0081]    If a power failure takes place, the micro controller  64  will detect the lack of line cycles, thus generating the signal PRGN to energize the relay K 1  and close burner  10  with the power of the CN.  
         [0082]    When the feeding energy of clock  24  that generates the voltage VCC is disconnected, the voltage VCC drops to 0 volts; however, the voltage VCCN provided by the capacitor CN is not prevented since this is prevented by the diode DN.  
         [0083]    Even though several specific embodiments of a programmed burner have been described in the present invention, it should be understood that the experts in the field may make changes of design as well as changes in the placements of its parts, in keeping with the displays of the present invention, which, however, will be understood to be included in the true spirit and scope of the invention which is asserted in the following claims.