CN214097643U - Fault self-diagnosis circuit and refrigerator - Google Patents
Fault self-diagnosis circuit and refrigerator Download PDFInfo
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- CN214097643U CN214097643U CN202022839789.3U CN202022839789U CN214097643U CN 214097643 U CN214097643 U CN 214097643U CN 202022839789 U CN202022839789 U CN 202022839789U CN 214097643 U CN214097643 U CN 214097643U
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Abstract
The utility model provides a trouble self-diagnosis circuit and refrigerator, including current detection circuit, voltage processing circuit and control circuit. The current detection circuit is used for detecting a current signal in a power supply circuit where at least one load is located, the voltage processing circuit determines a first voltage signal corresponding to the current signal according to the current signal detected by the current detection circuit, amplifies the first voltage signal, transmits a second voltage signal after amplification to the control circuit, and determines whether the at least one load has a fault according to the second voltage signal when the control circuit receives the second voltage signal transmitted by the voltage processing circuit. The utility model discloses can utilize refrigerator self system to accomplish the trouble self diagnosis process to load in the refrigerator.
Description
Technical Field
The utility model relates to a refrigerator technical field, in particular to trouble self-diagnosis circuit and refrigerator.
Background
As people's living standard is continuously improved, various refrigerators are moved into homes, but their main function is to keep food or other goods in a constant low temperature and cold state to prevent the food or other goods from being spoiled. Meanwhile, loads such as an air door and an illuminating lamp in the refrigerator enrich the refrigeration function of the refrigerator.
However, loads such as an air door and an illuminating lamp in the refrigerator cannot influence the operation of the refrigerator in a short time when the refrigerator breaks down, but normal temperature control of the refrigerator is influenced, so that power consumption is increased, the temperature of the refrigerator cannot be reduced, and energy-saving control and food preservation of the refrigerator are not facilitated. The patent with publication number CN106705565A discloses a fault diagnosis control method based on a refrigerator, which utilizes a fault diagnosis module to transmit fault information to a controller, utilizes the controller to process the fault information, a display module displays the fault diagnosis method, utilizes the controller to transmit the fault information and the fault diagnosis method to a client, utilizes the client to check the state of the refrigerator and transmit a warning signal to the controller, utilizes the controller to process the warning signal, and drives an alarm module to perform fault warning, so as to realize the advantages of simple structure, real-time fault information understanding and easy realization.
But the patent cannot complete the fault self-diagnosis process for the load in the refrigerator using the system of the refrigerator itself.
SUMMERY OF THE UTILITY MODEL
The utility model provides a trouble self-diagnosis circuit and refrigerator can utilize refrigerator self system to accomplish the trouble self-diagnosis process to load in the refrigerator.
In a first aspect, an embodiment of the present invention provides a fault self-diagnosis circuit, including: the device comprises a current detection circuit, a voltage processing circuit and a control circuit;
the current detection circuit is connected with the input end of the voltage processing circuit, and the output end of the voltage processing circuit is connected with the control circuit;
the current detection circuit is used for detecting a current signal in a power supply circuit where at least one load is located;
the voltage processing circuit is used for amplifying the first voltage signal output by the current detection circuit and transmitting the second voltage signal after amplification to the control circuit;
the control circuit is used for receiving the second voltage signal transmitted by the voltage processing circuit and determining whether the at least one load has a fault according to the second voltage signal.
Optionally, the current detection circuit comprises: sampling a resistor;
the load is connected in parallel, one end of the sampling resistor is connected with the power supply circuit where the load is located in series, the other end of the sampling resistor is connected with the standard power supply, and the first public end of the sampling resistor, which is connected with the power supply circuit, and the second public end of the sampling resistor, which is connected with the standard power supply, are respectively connected with the voltage processing circuit.
Optionally, the voltage processing circuit comprises: the circuit comprises a first resistor, a second resistor, a third resistor and an operational amplifier;
the first resistor is connected with the negative input end of the operational amplifier, the second resistor is connected with the positive input end of the operational amplifier, and the third resistor is connected between the negative input end of the operational amplifier and a third common end of the first resistor and the output end of the operational amplifier;
the first common end is connected with the first resistor, and the second common end is connected with the second resistor.
Alternatively,
the ratio of the third resistor to the first resistor is the amplification factor of the operational amplifier;
the first resistor and the second resistor are used for collecting first voltage signals at two ends of the sampling resistor.
Optionally, the control circuit comprises: the device comprises a processing unit, a judging unit and a display unit;
the processing unit is used for determining the working current values at two ends of the sampling resistor according to the second voltage signal, the sampling resistor and the amplification factor;
the judging unit is used for judging whether the working current value determined by the processing unit is within a preset working current range, if so, determining that the at least one load is normal, and if not, determining that the at least one load has a fault;
the display unit is used for displaying a fault display code of the at least one load with faults when the judging unit judges that the at least one load has faults.
Optionally, the control circuit further comprises: at least one control unit;
the control units are used for controlling the states corresponding to the loads, wherein each control unit corresponds to one load, and the states of the loads comprise load operation, load closing and load faults.
Optionally, when the at least one load comprises a load to be tested;
the control circuit is further configured to, when a fault exists in the at least one load, control the load to be tested to operate and control the at least one load except for the load to be tested to be turned off for each load to be tested, determine a current value to be tested at two ends of the sampling resistor according to the second voltage signal and the sampling resistor, determine whether the current value to be tested is within a preset working current range of the load to be tested, and if not, determine that the fault exists in the load to be tested.
In a second aspect, the embodiment of the present invention further provides a refrigerator, including: the self-fault diagnosis circuit, the code analysis circuit and the alarm circuit provided by the first aspect or any possible implementation manner of the first aspect;
the code analysis circuit is connected with the control circuit in the fault self-diagnosis circuit;
the alarm circuit is connected with the code analysis circuit;
the code analysis circuit is used for determining a load corresponding to the fault display code and a fault type corresponding to the load according to the fault display code displayed by the display unit in the control circuit;
and the alarm circuit is used for sending out an alarm signal when the code analysis circuit determines the load with the fault and the fault type corresponding to the load.
According to the above technical scheme, the embodiment of the utility model provides a trouble self-diagnosis circuit and refrigerator, including current detection circuit, voltage processing circuit and control circuit. The current detection circuit is used for detecting a current signal in a power supply circuit where at least one load is located, the voltage processing circuit determines a first voltage signal corresponding to the current signal according to the current signal detected by the current detection circuit, amplifies the first voltage signal, transmits a second voltage signal after amplification to the control circuit, and determines whether the at least one load has a fault according to the second voltage signal when the control circuit receives the second voltage signal transmitted by the voltage processing circuit. Therefore, the utility model discloses can utilize refrigerator self system to accomplish the trouble self diagnosis process to load in the refrigerator.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a self-fault diagnosis circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a self-fault diagnosis circuit including a sampling resistor according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a self-fault diagnosis circuit including a first resistor according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a self-diagnostic circuit including a processing unit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a self-diagnostic circuit including at least one control unit according to an embodiment of the present invention;
fig. 6 is a schematic view of a refrigerator according to an embodiment of the present invention.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments, based on the embodiments in the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a fault self-diagnosis circuit, including: a current detection circuit 10, a voltage processing circuit 20, and a control circuit 30;
the current detection circuit 10 is connected with the input end of the voltage processing circuit 20, and the output end of the voltage processing circuit 20 is connected with the control circuit 30;
the current detection circuit 10 is used for detecting a current signal in a power supply circuit where at least one load is located;
a voltage processing circuit 20, configured to amplify the first voltage signal output by the current detection circuit 10, and transmit a second voltage signal after amplification to the control circuit 30;
and a control circuit 30 for receiving the second voltage signal transmitted by the voltage processing circuit 20 and determining whether at least one load has a fault according to the second voltage signal.
The embodiment of the utility model provides a trouble self-diagnosis circuit, including current detection circuit, voltage processing circuit and control circuit. The current detection circuit is used for detecting a current signal in a power supply circuit where at least one load is located, the voltage processing circuit determines a first voltage signal corresponding to the current signal according to the current signal detected by the current detection circuit, amplifies the first voltage signal, transmits a second voltage signal after amplification to the control circuit, and determines whether the at least one load has a fault according to the second voltage signal when the control circuit receives the second voltage signal transmitted by the voltage processing circuit. Therefore, the embodiment of the utility model provides a can utilize refrigerator self system to accomplish the trouble self diagnosis process to load in the refrigerator.
Alternatively, on the basis of the self-fault diagnosis circuit shown in fig. 1, as shown in fig. 2, the current detection circuit 10 includes: a sampling resistor 101;
the load is connected in parallel, one end of the sampling resistor is connected with the power supply circuit where the load is located in series, the other end of the sampling resistor is connected with the standard power supply, and the first public end of the sampling resistor, which is connected with the power supply circuit, and the second public end of the sampling resistor, which is connected with the standard power supply, are respectively connected with the voltage processing circuit.
In an embodiment of the present invention, each load mainly includes an electric switching valve, a fan motor, a lighting lamp, and a damper motor with low power. The loads in the refrigerator are mutually connected in parallel, so that the polling self-diagnosis of each load can be ensured when the load is determined to have a fault, and the target load with the fault is determined according to the self-diagnosis result of the fault self-diagnosis circuit. The sampling resistor is connected between the power supply circuit where the at least one load is located and the standard power supply 12V, so that the sampling resistor is connected with the at least one load in series, and the current value of the two ends of the sampling resistor is equal to the current value of the at least one load. Meanwhile, the two ends of the sampling resistor are connected with the input end of the voltage processing circuit, so that the voltage value output by the current circuit can be detected through the voltage processing circuit, and whether at least one load of the refrigerator breaks down or not is judged according to the change of the voltage value, so that a user can be reminded of maintaining the refrigerator in time, and the faults of the load in the refrigerator are eliminated.
Alternatively, on the basis of the self-fault diagnosis circuit shown in fig. 2, as shown in fig. 3, the voltage processing circuit 20 includes: a first resistor 201, a second resistor 202, a third resistor 203 and an operational amplifier 204;
the first resistor 201 is connected to the negative input terminal of the operational amplifier 204, the second resistor 202 is connected to the positive input terminal of the operational amplifier 204, and the third resistor 203 is connected between the negative input terminal of the operational amplifier 204 and the third common terminal of the first resistor 201 and the output terminal of the operational amplifier 204;
the first common terminal is connected to the first resistor 201, and the second common terminal is connected to the second resistor 202.
In an embodiment of the present invention, the voltage processing circuit includes a first resistor, a second resistor, a third resistor, and an operational amplifier. The first resistor is connected with the negative input end of the operational amplifier, and the third resistor is connected between the negative input end of the operational amplifier and the common end of the first resistor and the output end of the operational amplifier, namely the negative input end of the operational amplifier is connected with the output end of the operational amplifier, so that a negative feedback configuration of the operational amplifier can be formed, the voltage gain of the operational amplifier is large, and the stable operation of the circuit can be ensured by using the negative feedback configuration. When the first common end is connected with the first resistor and the second common end is connected with the second resistor, the first resistor and the second resistor can be ensured to collect voltages at two ends of the first common end and the second common end.
Alternatively, a self-fault diagnosis circuit including a first resistor as shown in FIG. 3,
the ratio of the third resistor to the first resistor is the amplification factor of the operational amplifier;
the first resistor and the second resistor are used for collecting first voltage signals at two ends of the sampling resistor.
The embodiment of the present invention provides an embodiment, the amplification factor of the operational amplifier in the voltage processing circuit is the ratio of the third resistor to the first resistor, so that the amplification factor of the operational amplifier can be controlled by adjusting the resistance of the third resistor and the first resistor. The current signals at the two ends of the sampling resistor can be obtained, so that the voltage signals at the two ends of the sampling resistor can be determined according to the current signals and the resistance value of the sampling resistor. The first resistor and the second resistor are connected with two ends of the sampling resistor, so that voltage signals at two ends of the sampling resistor can be directly obtained.
Alternatively, on the basis of the self-fault diagnosis circuit shown in fig. 3, as shown in fig. 4, the control circuit 30 includes: a processing unit 301, a determination unit 302, and a display unit 303;
the processing unit 301 is configured to determine a working current value at two ends of the sampling resistor according to the second voltage signal, the sampling resistor, and the amplification factor;
the determining unit 302 is configured to determine whether the working current value determined by the processing unit 301 is within a preset working current range, determine that the at least one load is normal if the working current value is within the preset working current range, and determine that a fault exists in the at least one load if the working current value is not within the preset working current range;
the display unit 303 is configured to display a fault display code indicating that the at least one load has a fault when the determining unit 302 determines that the at least one load has a fault.
The embodiment of the utility model provides an in, control circuit includes the processing unit, judge unit and display element, wherein, the second voltage signal that processing unit sent according to voltage processing circuit, the sampling resistor among the current detection circuit and the voltage processing circuit in operational amplifier's the magnification confirm the current value at sampling resistor both ends, specifically, confirm the second voltage value according to second voltage signal, confirm the operating voltage value at sampling resistor both ends with the ratio of second voltage value and magnification, confirm the operating current value at sampling resistor both ends with the ratio of this voltage value and sampling resistor's resistance. The judging unit judges whether the working current value is within a preset working current range, if so, the at least one load is determined to be normal, if not, the at least one load is determined to have a fault, and when the at least one load is determined to have the fault, the display unit is utilized to display a fault display code of the at least one load with the fault, so that a user can find the fault in time, a maintenance engineer can quickly lock the fault load according to fault information, the fault is timely eliminated, and the refrigerator energy saving and food fresh keeping are facilitated. Specifically, if the preset working current range (0.8-1.0A) of at least one load in normal working is detected, when the working current value of two ends of the sampling resistor is 0.9A, the at least one load is determined to be normal, and when the working current value of two ends of the sampling resistor is 0.7A, at least one load fault is determined.
Alternatively, on the basis of the self-fault diagnosis circuit shown in fig. 4, as shown in fig. 5, the control circuit 30 further includes: at least one control unit 304;
the control units are used for controlling the states corresponding to the loads, wherein each control unit corresponds to one load, and the states of the loads comprise load operation, load closing and load faults.
The embodiment of the present invention provides a control circuit, which further includes at least one control unit, wherein each control unit corresponds to a load, the control unit is used for controlling the state of the corresponding load, and the state of the load includes load operation, load closing and load failure. If at least one load has a fault, it is still not possible to determine which load in particular has a fault, and therefore a control unit corresponding to each load is arranged in the control circuit for determining which load in particular has a fault.
Alternatively, the self-fault diagnosis circuit shown in fig. 1, when the at least one load includes one load to be tested;
the control circuit is further configured to, when a fault exists in the at least one load, control the load to be tested to operate and control the at least one load except for the load to be tested to be turned off for each load to be tested, determine a current value to be tested at two ends of the sampling resistor according to the second voltage signal and the sampling resistor, determine whether the current value to be tested is within a preset working current range of the load to be tested, and if not, determine that the fault exists in the load to be tested.
In the embodiment of the present invention, when the control circuit determines that at least one load has a fault, the state of each load is determined by polling. And for each load to be tested, controlling the load to be tested to work and controlling other loads except the load to be tested to be closed. And detecting the load to be detected by adopting a method for detecting at least one load by using a fault self-diagnosis circuit, and determining that the load to be detected has a fault if the current value to be detected of the load to be detected is not within a preset working current range of the load to be detected. The present invention is described in a preferred embodiment, in which at least one control unit is present in the control circuit, and each control unit corresponds to a load for controlling the state of the load. Specifically, the refrigerator comprises four loads, namely an electric switching valve, a fan motor, an illuminating lamp and a damper motor, the control circuit comprises an electric switching valve control unit, a fan motor control unit, an illuminating lamp control unit and a damper motor control unit, if the fault self-diagnosis circuit determines that the four loads have faults but does not determine which load has the fault, the electric switching valve control unit controls the electric switching valve to work, the fan motor control unit, the illuminating lamp control unit and the damper motor control unit respectively control the fan motor, the illuminating lamp and the damper motor to be closed, a current detection circuit is used for detecting current signals at two ends of a sampling resistor, namely at two ends of the electric switching valve, a voltage processing circuit is used for obtaining voltage signals at two ends of the sampling resistor, the voltage signals are amplified to obtain amplified voltage signals, and the power supply voltage are amplified according to the amplified voltage signals, And determining the working current value at the two ends of the electric switching valve by the amplification factor of the operational amplifier and the current signal at the two ends of the electric switching valve, judging whether the working current value is within a preset working current range of the electric switching valve, and if not, determining that the electric switching valve has a fault.
As shown in fig. 6, the embodiment of the present invention further provides a refrigerator, including: the self-diagnosis circuit 601, the code analysis circuit 602 and the alarm circuit 603 provided by any of the above embodiments;
the code analysis circuit 602 is connected to the control circuit 30 in the fault self-diagnosis circuit 601;
the alarm circuit 603 is connected to the code analysis circuit 602;
the code analysis circuit 602 is configured to determine, according to the fault display code displayed by the display unit in the control circuit 30, a load corresponding to the fault display code and a fault type corresponding to the load;
the alarm circuit 603 is configured to send out an alarm signal when the code analysis circuit 602 determines a faulty load and a fault type corresponding to the load.
The embodiment of the utility model provides a refrigerator, this refrigerator is including trouble self-diagnosis circuit, code analysis circuit and warning circuit, wherein trouble self-diagnosis circuit is including current detection circuit, voltage processing circuit and control circuit. The current detection circuit is used for detecting a current signal in a power supply circuit where at least one load is located, the voltage processing circuit determines a first voltage signal corresponding to the current signal according to the current signal detected by the current detection circuit, amplifies the first voltage signal, transmits a second voltage signal after amplification to the control circuit, and determines whether the at least one load has a fault according to the second voltage signal when the control circuit receives the second voltage signal transmitted by the voltage processing circuit. The code analysis circuit is connected with the control circuit, displays a fault display code corresponding to the load when the control circuit determines that the load has a fault, and analyzes the fault display code to determine the load corresponding to the fault display code and the fault type corresponding to the load. Specifically, when the control circuit determines that the air door motor has a fault, the fault display code is tmofe 01, the code analysis circuit analyzes the fault display code to obtain the fault, the air door motor in the refrigerator has a fault, and the specific fault type is the power failure of the leakage protector. When the code analysis circuit determines that the air door motor has a fault and the fault type is the power failure of the leakage protector, an alarm signal is sent out so as to inform a user of timely maintaining the fault.
To sum up, the utility model provides a each trouble self-diagnosis circuit and lampblack absorber have following beneficial effect at least:
1. the embodiment of the utility model provides an in, fault self-diagnosis circuit is including current detection circuit, voltage processing circuit and control circuit. The current detection circuit is used for detecting a current signal in a power supply circuit where at least one load is located, the voltage processing circuit determines a first voltage signal corresponding to the current signal according to the current signal detected by the current detection circuit, amplifies the first voltage signal, transmits a second voltage signal after amplification to the control circuit, and determines whether the at least one load has a fault according to the second voltage signal when the control circuit receives the second voltage signal transmitted by the voltage processing circuit. Therefore, the embodiment of the utility model provides a can utilize refrigerator self system to accomplish the trouble self diagnosis process to load in the refrigerator.
2. In an embodiment of the present invention, each load mainly includes an electric switching valve, a fan motor, a lighting lamp, and a damper motor with low power. The loads in the refrigerator are mutually connected in parallel, so that the polling self-diagnosis of each load can be ensured when the load is determined to have a fault, and the target load with the fault is determined according to the self-diagnosis result of the fault self-diagnosis circuit. The sampling resistor is connected between the power supply circuit where the at least one load is located and the standard power supply, so that the sampling resistor is connected with the at least one load in series, and the current value at two ends of the sampling resistor is equal to the current value of the at least one load. Meanwhile, the two ends of the sampling resistor are connected with the input end of the voltage processing circuit, so that the voltage value output by the current circuit can be detected through the voltage processing circuit, and whether at least one load of the refrigerator breaks down or not is judged according to the change of the voltage value, so that a user can be reminded of maintaining the refrigerator in time, and the faults of the load in the refrigerator are eliminated.
3. In an embodiment of the present invention, the voltage processing circuit includes a first resistor, a second resistor, a third resistor, and an operational amplifier. The first resistor is connected with the negative input end of the operational amplifier, and the third resistor is connected between the negative input end of the operational amplifier and the common end of the first resistor and the output end of the operational amplifier, namely the negative input end of the operational amplifier is connected with the output end of the operational amplifier, so that a negative feedback configuration of the operational amplifier can be formed, the voltage gain of the operational amplifier is large, and the stable operation of the circuit can be ensured by using the negative feedback configuration. When the first common end is connected with the first resistor and the second common end is connected with the second resistor, the first resistor and the second resistor can be ensured to collect voltages at two ends of the first common end and the second common end.
4. The embodiment of the present invention provides an embodiment, the amplification factor of the operational amplifier in the voltage processing circuit is the ratio of the third resistor to the first resistor, so that the amplification factor of the operational amplifier can be controlled by adjusting the resistance of the third resistor and the first resistor. The current signals at the two ends of the sampling resistor can be obtained, so that the voltage signals at the two ends of the sampling resistor can be determined according to the current signals and the resistance value of the sampling resistor. The first resistor and the second resistor are connected with two ends of the sampling resistor, so that voltage signals at two ends of the sampling resistor can be directly obtained.
5. The embodiment of the utility model provides an in, control circuit includes the processing unit, judge unit and display element, wherein, the second voltage signal that processing unit sent according to voltage processing circuit, the sampling resistor among the current detection circuit and the voltage processing circuit in operational amplifier's the magnification confirm the current value at sampling resistor both ends, specifically, confirm the second voltage value according to second voltage signal, confirm the operating voltage value at sampling resistor both ends with the ratio of second voltage value and magnification, confirm the operating current value at sampling resistor both ends with the ratio of this voltage value and sampling resistor's resistance. The judging unit judges whether the working current value is within a preset working current range, if so, the at least one load is determined to be normal, if not, the at least one load is determined to have a fault, and when the at least one load is determined to have the fault, the display unit is utilized to display a fault display code of the at least one load with the fault, so that a user can find the fault in time, a maintenance engineer can quickly lock the fault load according to fault information, the fault is timely eliminated, and the refrigerator energy saving and food fresh keeping are facilitated.
6. The embodiment of the present invention provides a control circuit, which further includes at least one control unit, wherein each control unit corresponds to a load, the control unit is used for controlling the state of the corresponding load, and the state of the load includes load operation, load closing and load failure. If at least one load has a fault, it is still not possible to determine which load in particular has a fault, and therefore a control unit corresponding to each load is arranged in the control circuit for determining which load in particular has a fault.
7. In the embodiment of the present invention, when the control circuit determines that at least one load has a fault, the state of each load is determined by polling. And for each load to be tested, controlling the load to be tested to work and controlling other loads except the load to be tested to be closed. And detecting the load to be detected by adopting a method for detecting at least one load by using a fault self-diagnosis circuit, and determining that the load to be detected has a fault if the current value to be detected of the load to be detected is not within a preset working current range of the load to be detected. The present invention is described in a preferred embodiment, in which at least one control unit is present in the control circuit, and each control unit corresponds to a load for controlling the state of the load. Specifically, the refrigerator comprises four loads, namely an electric switching valve, a fan motor, an illuminating lamp and a damper motor, the control circuit comprises an electric switching valve control unit, a fan motor control unit, an illuminating lamp control unit and a damper motor control unit, if the fault self-diagnosis circuit determines that the four loads have faults but does not determine which load has the fault, the electric switching valve control unit controls the electric switching valve to work, the fan motor control unit, the illuminating lamp control unit and the damper motor control unit respectively control the fan motor, the illuminating lamp and the damper motor to be closed, a current detection circuit is used for detecting current signals at two ends of a sampling resistor, namely at two ends of the electric switching valve, a voltage processing circuit is used for obtaining voltage signals at two ends of the sampling resistor, the voltage signals are amplified to obtain amplified voltage signals, and the power supply voltage are amplified according to the amplified voltage signals, And determining the working current value at the two ends of the electric switching valve by the amplification factor of the operational amplifier and the current signal at the two ends of the electric switching valve, judging whether the working current value is within a preset working current range of the electric switching valve, and if not, determining that the electric switching valve has a fault.
8. The embodiment of the utility model provides an in, the refrigerator is including trouble self-diagnosis circuit, code analysis circuit and warning circuit, wherein trouble self-diagnosis circuit is including current detection circuit, voltage processing circuit and control circuit. The current detection circuit is used for detecting a current signal in a power supply circuit where at least one load is located, the voltage processing circuit determines a first voltage signal corresponding to the current signal according to the current signal detected by the current detection circuit, amplifies the first voltage signal, transmits a second voltage signal after amplification to the control circuit, and determines whether the at least one load has a fault according to the second voltage signal when the control circuit receives the second voltage signal transmitted by the voltage processing circuit. The code analysis circuit is connected with the control circuit, displays a fault display code corresponding to the load when the control circuit determines that the load has a fault, and analyzes the fault display code to determine the load corresponding to the fault display code and the fault type corresponding to the load. When the code analysis circuit determines that the load has a fault and the fault type, an alarm signal is sent out so as to inform a user of timely maintaining the fault.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising" does not exclude the presence of other similar elements in a process, method, article, or apparatus that comprises the element.
Finally, it is to be noted that: the above is only the preferred embodiment of the present invention, which is only used to illustrate the technical solution of the present invention, but not to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention is included in the protection scope of the present invention.
Claims (6)
1. A self-diagnostic circuit, comprising: the device comprises a current detection circuit, a voltage processing circuit and a control circuit;
the current detection circuit is connected with the input end of the voltage processing circuit, and the output end of the voltage processing circuit is connected with the control circuit;
the current detection circuit is used for detecting a current signal in a power supply circuit where at least one load is located;
the voltage processing circuit is used for amplifying the first voltage signal output by the current detection circuit and transmitting the second voltage signal after amplification to the control circuit;
the control circuit is used for receiving the second voltage signal transmitted by the voltage processing circuit and determining whether the at least one load has a fault according to the second voltage signal.
2. The self-fault diagnosis circuit according to claim 1, wherein the current detection circuit comprises: sampling a resistor;
the load is connected in parallel, one end of the sampling resistor is connected with the power supply circuit where the load is located in series, the other end of the sampling resistor is connected with the standard power supply, and the first public end of the sampling resistor, which is connected with the power supply circuit, and the second public end of the sampling resistor, which is connected with the standard power supply, are respectively connected with the voltage processing circuit.
3. The self-fault diagnosis circuit according to claim 2, wherein the voltage processing circuit comprises: the circuit comprises a first resistor, a second resistor, a third resistor and an operational amplifier;
the first resistor is connected with the negative input end of the operational amplifier, the second resistor is connected with the positive input end of the operational amplifier, and the third resistor is connected between the negative input end of the operational amplifier and a third common end of the first resistor and the output end of the operational amplifier;
the first common end is connected with the first resistor, and the second common end is connected with the second resistor.
4. The self-fault diagnosis circuit according to claim 3,
the ratio of the third resistor to the first resistor is the amplification factor of the operational amplifier;
the first resistor and the second resistor are used for collecting first voltage signals at two ends of the sampling resistor.
5. The self-fault diagnosis circuit according to claim 4, wherein the control circuit further comprises: at least one control unit;
the control units are used for controlling the states corresponding to the loads, wherein each control unit corresponds to one load, and the states of the loads comprise load operation, load closing and load faults.
6. A refrigerator, characterized by comprising: the self-diagnostic circuit, code analysis circuit and alarm circuit of any of claims 1 to 5;
the code analysis circuit is connected with the control circuit in the fault self-diagnosis circuit;
the alarm circuit is connected with the code analysis circuit;
the code analysis circuit is used for determining a load corresponding to a fault display code and a fault type corresponding to the load according to the fault display code displayed by the display unit in the control circuit;
and the alarm circuit is used for sending out an alarm signal when the code analysis circuit determines the load with the fault and the fault type corresponding to the load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022839789.3U CN214097643U (en) | 2020-12-01 | 2020-12-01 | Fault self-diagnosis circuit and refrigerator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114253383A (en) * | 2021-11-17 | 2022-03-29 | 中国北方车辆研究所 | Redundant power supply circuit with fault detection and positioning functions and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114253383A (en) * | 2021-11-17 | 2022-03-29 | 中国北方车辆研究所 | Redundant power supply circuit with fault detection and positioning functions and method |
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