Abstract:
A diagnostic method and apparatus for self-diagnosis a load side of an electric device to detect the occurrence of the abnormal electricity usage at the load using a simple apparatus based on a current sensor includes checking rated power consumption of a load, measuring power consumption of the load in operation, calculating a change in the power consumption by comparing the rated power consumption of the load with the power consumption of the load in operation, and determining that an abnormal power consumption occurs at the load when the change in the power consumption is outside a predetermined range.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims the benefit of Korean Patent Application No. 2012-0000844, filed on Jan. 4, 2012 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. 
       BACKGROUND 
       [0002]    1. Field 
         [0003]    One or more embodiments relate to a self-diagnostic apparatus and a method for an electric device configured to diagnose whether abnormal power consumption has occurred in the electric device. 
         [0004]    2. Description of the Related Art 
         [0005]    A self-diagnostic apparatus and a method for an electric device are configured to diagnose and determine by the electric device itself whether the electric device is operating normally. For example, through the detection of an abnormal output at one or more sensors, the detection of a feedback voltage at a direct current (DC) load, and the detection of a zero cross at an alternating current (AC) load, the determination is made whether the electric device, that is, the load, is normal. 
         [0006]    As for a heater, which is one of the loads that are commonly used in an electric device, a defect of the heater is difficult to diagnose immediately, and an early completion of a timed operation or a time-out of an operation is detected as an error of the heater. Because of the above, in a case when a defect of the heater is to be corrected, the defect is confirmed by disconnecting the electric device and re-measuring the load of the heater. In such a case, diagnosis takes additional time, and when the characteristics of the heater are changed it is difficult to locate the defect. 
       SUMMARY 
       [0007]    Therefore, it is an aspect of one or more embodiments to enable a self-diagnosis to be easily performed at a load side to detect the occurrence of the abnormal electricity usage at the load by using a simple apparatus comprising a current sensor. 
         [0008]    Additional aspects and/or advantages of one or more embodiments will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of one or more embodiments of disclosure. One or more embodiments are inclusive of such additional aspects. 
         [0009]    In accordance with one or more embodiments, a method of diagnosing an electric device is as follows. Rated power consumption of a load may be checked. Power consumption of the load in operation may be measured. A change in the power consumption may be calculated by comparing the rated power consumption of the load with the power consumption of the load in operation. An abnormal power consumption occurring at the load may be determined when the change in the power consumption is outside a predetermined range. 
         [0010]    In the measuring of the power consumption of the load in operation, a current value of electric power that is supplied to the load may be measured using a current detector, and the power consumption of the load may be calculated based on the measured current value. 
         [0011]    In a case when a plurality of loads are provided, while operating one of the plurality of the loads, the change in the power consumption may be calculated by comparing the rated power consumption of the load with the power consumption of the load in operation, and when the change in the power consumption is outside the predetermined range, the determination may be made that an abnormal power consumption has occurred at the load that is in operation. 
         [0012]    The diagnosing may be performed in sequence on each of the plurality of loads. 
         [0013]    The power consumption of the load in operation may be provided from a current sensor, which may be provided on a power cable that supplies power to the load and may be configured to measure the current of an electric power that is being supplied to the load through the electrical cable. 
         [0014]    The current sensor may be a sensor used in at least one of a temperature current (TC) sensor scheme, a dummy resistor scheme that uses a voltage drop by a current, and a hall sensor scheme. 
         [0015]    In accordance with one or more embodiments, an apparatus for diagnosing an electric device may include a current measurer and a controller. The current measurer may be configured to measure an amount of current that is being supplied to a load while the load is in operation. The controller may be configured to measure a power consumption of the load in operation based on the amount of the current that is measured through the current measurer, to calculate a change in the power consumption by comparing the power consumption of the load in operation with a rated power consumption of the load, and to determine that an abnormal power consumption has occurred at the load when the change in the power consumption is outside a predetermined range. 
         [0016]    The current measurer may be a current sensor, which may be provided at a power cable that supplies power to the load and may be configured to measure the amount of the current of the power that is being supplied to the load through the power cable. 
         [0017]    The current sensor may be a sensor used in at least one of a temperature current (TC) sensor scheme, a dummy resistor scheme that uses a voltage drop by a current, and a hall sensor scheme. 
         [0018]    As described above, by enabling self-diagnosis to be easily performed at the load side to detect abnormal electrical current at the load by using a simple apparatus having the basis of a current sensor, monitoring may be performed while the load is in operation without having to disassemble the electric device, and thus, the application of the above may be easily made at a mass production line of the electrical device, as well as at the time of servicing the electrical device, and because the monitoring is performed on the basis of the overall power consumption, no additional costs are incurred by each load. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0019]    These and/or other aspects of the disclosure will become apparent and more readily appreciated from the following description of embodiments, taken in conjunction with the accompanying drawings of which: 
           [0020]      FIG. 1  illustrates a diagnostic apparatus of an electrical device according to one or more embodiments. 
           [0021]      FIG. 2  illustrates a diagnostic method of an electrical device according to one or more embodiments. 
           [0022]      FIG. 3  illustrates a diagnostic method of an electrical device according to one or more embodiments. 
           [0023]      FIG. 4  illustrates a diagnostic apparatus of an electrical device according to one or more embodiments. 
       
    
    
     DETAILED DESCRIPTION 
       [0024]    Reference will now be made in detail to one or more embodiments, illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. In this regard, embodiments of the present invention may be embodied in many different forms and should not be construed as being limited to embodiments set forth herein, as various changes, modifications, and equivalents of the systems, apparatuses and/or methods described herein will be understood to be included in the invention by those of ordinary skill in the art after embodiments discussed herein are understood. Accordingly, embodiments are merely described below, by referring to the figures, to explain aspects of the present invention. 
         [0025]      FIG. 1  is a drawing showing a diagnostic apparatus of an electrical device according to one or more embodiments. As shown on  FIG. 1 , a load  102  is supplied with power from a power supply  104 . Here, the load  102 , for example, may be a motor  102   a , a heater  102   b , a valve  102   c , a LED  102   d , and a display  102   e  that compose, for example, a refrigerator, and the load  102  may vary depending on the type of an electrical device. 
         [0026]    A diagnostic apparatus  106  may be provided with a plurality of relays  108  including a first relay  108   a , a second relay  108   b , a third relay  108   c , a fourth relay  108   d  and a fifth relay  108   e , and through each of the plurality of relays  108 , power may be supplied to each of the loads  102 . That is, for example, when the first relay  108   a  is turned ON, power may be provided to the motor  102   a , and when the second relay  108   b  is turned ON, power may be provided to the heater  102   b . Likewise, for example, when the third relay  108   c  is turned ON, power may be provided to the valve  102   c , when the fourth relay  108   d  is turned ON, power may be supplied to the LED  102   d , and when the fifth relay  108   e  is turned ON, power may be provided to the display  102   e.    
         [0027]    The ON/OFF for each relay of the plurality of relays  108  may be controlled by a controller  110 . The controller  110  may be capable of controlling the power to be supplied only to a desired one of the plurality of loads  102   a ,  102   b ,  102   c ,  102   d , and  102   e , by selectively controlling the ON/OFF of each relay of the plurality of relays  108 , and if needed, the controller  110  may control the power to be supplied to more than two loads of the plurality of loads  102   a ,  102   b ,  102   c ,  102   d , and  102   e . Through the control as such, the power may be controlled to be sequentially supplied to each relay of the plurality of relays  108 . For example, among the plurality of loads  102 , the controller  110  may supply power to the motor  102   a , and then, after stopping the supply of the power to the motor  102   a , the controller  110  may supply power to the heater  102   b  only. Likewise, power may be supplied to each of the valve  102   c , the LED  102   d , and the display  102   e  alone by the controller  110 . 
         [0028]    A current detector  112  may be provided on a power cable positioned between the power supply  104  and the relay  108 , and may be configured to measure the current level supplied through the power cable to the load  102 . The current detector  112  may measure the current level supplied toward the load  102 , and may provide a value that corresponds to the measured amount of the current, that is, a current value, to the controller  110 . The controller  110  may receive the current value that is provided from the current detector  112 , and on the basis of the current value, may measure (calculate) the amount of the power consumption at the load  102 . The current detector  112  may be, for example, one of a Temperature Current (TC) sensor method sensor, a dummy resistance method sensor that uses a voltage drop by a current, and a hall sensor method sensor. 
         [0029]    The controller  110 , by using the relay  108  and the current detector  112 , may measure the amount of the power consumption at each of the loads of the plurality of loads  102 . That is, by turning ON the first replay  108   a  among the plurality of relays  108 , power may be supplied only to the motor  102   a  among the plurality of loads  102  (at this time, the motor  102   a  is in operation), and at this time, the controller  110  may receive the current value provided from the current detector  112 , and on the basis of the current value above, the amount of the power supplied through the present power cable may be calculated, so that the amount of the power consumption, while the motor  102   a  is in operation, may be measured. Through the method, the amount of the power consumption at the each load of the plurality of loads  102 , while each load is in operation, may be measured. 
         [0030]    The controller  110 , by measuring the amount of the power consumption with respect to each load of the plurality of loads  102  in operation, may check whether abnormal power consumption has occurred at the each load of the plurality of loads  102 . Here, the abnormal power consumption may indicate that the change in the power consumption at the each load of the plurality of loads  102  is outside a normal range. It may be assumed that the change in the power consumption of the load  102  in operation represents the difference between the amount of the rated power consumption at the each load and the amount of the power consumption at the each load. If the range of the change in the power consumption is below or exceeds a predetermined range, it may be determined that there is an abnormality in the load  102 . 
         [0031]    Data about the rated power consumption of the each load of the plurality of loads  102  and data about the predetermined range may be provided in advance in the form of a look-up table at the controller  110 . The data about the rated power consumption of the each load of the plurality of loads  102  may be provided from the manufacturer of the corresponding load  102 , or may be obtained through an experiment, for example. The data about the predetermined range may also be obtained through experiment. 
         [0032]      FIG. 2  illustrates a diagnostic method of an electrical device according to one or more embodiments. The diagnostic method of an electrical device shown in  FIG. 2  is an example where a diagnosis is performed on a load, which is currently in operation. First, the controller  110  may check the rated power consumption of the load  102  in operation ( 202 ). In addition, the controller  110  may measure the power consumption of the load  102 , which is in operation ( 204 ). The power consumption of the load  102  while in operation may be measured on the basis of the amount of the current that is detected through the current detector  112 . The controller  110 , through the comparison of the rated power consumption of the load  102  with the power consumption in operation, may calculate the change in the power consumption, and by comparing the change in the power consumption of the load  102  with the predetermined range provided in advance, the controller  110  may check whether the change in the power consumption of the load  102  is outside the predetermined range ( 206 ). If the change in the power consumption of the load  102  is outside the predetermined range (‘YES’ at operation  206 ), the controller  110  may determine that abnormal power consumption has occurred at the corresponding load  102 , and may determine that an error occurs at the load  102 , the controller  110  may display an error through the display  102   e . At this time, by displaying an inherent code of the corresponding load  102 , an administrator or a user may be informed which one of the plurality of loads  102  has an error. On the contrary, if the change in the power consumption of the load  102  is not outside the predetermined range (‘NO’ at operation  206 ), the controller  110  may determine that the corresponding load  102  is operating normally, and may complete the diagnosis. 
         [0033]      FIG. 3  illustrates a diagnostic method of an electrical device according to one or more embodiments. The diagnostic method of an electrical device shown in  FIG. 3  is an example of sequentially diagnosing a plurality of loads in a non-operation by sequentially operating the plurality of loads. 
         [0034]    First, the controller  110  may stop operating all of the plurality of loads  102  ( 302 ) so as to measure the power consumption of only one load  102  in operation by operating only one load  102  at a time. Next, the controller  110  may check the rated power consumption of each load of the plurality of loads  102  ( 304 ). The controller  110  may control the plurality of loads such that that one of the plurality of load  102  is operated (power ON), and may measure the power consumption of the corresponding load  102  while the corresponding load  102  is in operation ( 306 ). The power consumption of the load  102  in operation may be measured on the basis of the amount of current that is detected through the current detector  112 . The controller  110  may calculate the change in the power consumption through a comparison of the rated power consumption of the load  102  in operation with the power consumption of the load  102  in operation, and by comparing the change in the power consumption of the load  102  with a predetermined range provided in advance, the controller  110  may check whether the change in the power consumption of the load  102  is outside the predetermined range ( 308 ). If the change in the power consumption of the corresponding load  102  is outside the predetermined range (‘YES’ from  308 ), the controller  110  may determine that abnormal power consumption has occurred at the corresponding load  102 , and may determine that the error occurs at the load  102 , the controller  110  may display an error through the display  102   e  ( 310 ). At this time, by displaying an inherent code of the corresponding load  102 , an administrator or a user may be informed which one of the plurality of load  102  has an error. 
         [0035]    If an error of the corresponding load  102  is determined, the controller  110  may perform a safety countermeasure ( 312 ). That is, the controller  110  may check whether a block having the load  102  with the error may critically affect the overall operation of the electrical device, and if found that the critical effect is anticipated, the safety measure including the shutting down of the electrical device may be performed. Alternatively, the controller  110  may also check whether the corresponding error is a temporary or a continuous error through an inspection while the operation of the corresponding load  102  is stopped for a predetermined period of time, and if the error is found to be the continuous error, may take the proper safety action, may convert the status of the electrical device, and may guide a user to perform a safety action, such as an error notification or a guide on actions needed to be taken place. In addition, even in a case when the corresponding error is temporary, if the frequency of the occurrence of the error is high, the controller  110  may convert the status of the electrical device and guide a user to perform a safety action, such as an error notification or a guide on actions needed to be taken place. On the contrary, if the change in the power consumption of the corresponding load  102  is not outside the predetermined range (‘NO’ at operation  308 ), the controller  110  may determine that the corresponding load  102  is operating normally, and may stop the operation of the corresponding load  102  ( 312 ). The diagnosis may be performed with respect to all of the loads  102  ( 314 ), and if there are any of the loads  102  remaining to be diagnosed (‘NO’ at operation  314 ), the controller  110  may control another one of the loads  102  to operate (power-ON) and may measure the power consumption of the corresponding load  102  in operation ( 316 ). Subsequently, by returning to operation  308  of comparing the change in the power consumption of the load  102  with the predetermined range, the process above may be repeated. 
         [0036]      FIG. 4  illustrates a diagnostic apparatus of an electrical device according to one or more embodiments. The diagnostic apparatus of an electrical device shown on  FIG. 4  illustrates one or more embodiments in which a measuring apparatus  402  is connected to the controller  110  to display the error and the code of the load  102  through the measuring apparatus  402  in a case when a display is not provided at the electrical device. The other components except for the communication connection between the controller  110  and the measuring apparatus  402  are otherwise identical to that of those as described in  FIG. 1  and therefore, a detailed description will be omitted. 
         [0037]    In one or more embodiments, any apparatus, system, element, or interpretable unit descriptions herein include one or more hardware devices or hardware processing elements. For example, in one or more embodiments, any described apparatus, system, element, retriever, pre or post-processing elements, tracker, detector, encoder, decoder, etc., may further include one or more memories and/or processing elements, and any hardware input/output transmission devices, or represent operating portions/aspects of one or more respective processing elements or devices. Further, the term apparatus should be considered synonymous with elements of a physical system, not limited to a single device or enclosure or all described elements embodied in single respective enclosures in all embodiments, but rather, depending on embodiment, is open to being embodied together or separately in differing enclosures and/or locations through differing hardware elements. 
         [0038]    In addition to the above described embodiments, embodiments can also be implemented through computer readable code/instructions in/on a non-transitory medium, e.g., a computer readable medium, to control at least one processing device, such as a processor or computer, to implement any above described embodiment. The medium can correspond to any defined, measurable, and tangible structure permitting the storing and/or transmission of the computer readable code. 
         [0039]    The media may also include, e.g., in combination with the computer readable code, data files, data structures, and the like. One or more embodiments of computer-readable media include: magnetic media such as hard disks, floppy disks, and magnetic tape; optical media such as CD ROM disks and DVDs; magneto-optical media such as optical disks; and hardware devices that are specially configured to store and perform program instructions, such as read-only memory (ROM), random access memory (RAM), flash memory, and the like. Computer readable code may include both machine code, such as produced by a compiler, and files containing higher level code that may be executed by the computer using an interpreter, for example. The media may also be any defined, measurable, and tangible distributed network, so that the computer readable code is stored and executed in a distributed fashion. Still further, as only an example, the processing element could include a processor or a computer processor, and processing elements may be distributed and/or included in a single device. 
         [0040]    The computer-readable media may also be embodied in at least one application specific integrated circuit (ASIC) or Field Programmable Gate Array (FPGA), as only examples, which execute (e.g., processes like a processor) program instructions. 
         [0041]    While aspects of the present invention has been particularly shown and described with reference to differing embodiments thereof, it should be understood that these embodiments should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each embodiment should typically be considered as available for other similar features or aspects in the remaining embodiments. Suitable results may equally be achieved if the described techniques are performed in a different order and/or if components in a described system, architecture, device, or circuit are combined in a different manner and/or replaced or supplemented by other components or their equivalents. 
         [0042]    Thus, although a few embodiments have been shown and described, with additional embodiments being equally available, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.