Fault detection device for AC load control circuit, control circuit, and electronic device

Abstract

The invention relates to the technical field of AC load control detection, and discloses a fault detection device of an AC load control circuit, the control circuit and electronic equipment. The alternating-current load control circuit comprises a switch controller and an alternating-current load which are connected in series; the fault detection device comprises a signal generation module which is connected with a signal input end of a switch controller and is configured to input a switching signal potential to the switch controller so as to switch a level state of an alternating current load; the detection module is connected with the alternating current load in parallel and is configured to obtain detection potentials of the alternating current load in different level states so as to determine the fault type of the alternating current load control circuit according to the incidence relation between the detection potentials and the switching signal potentials; wherein the fault type comprises an alternating current load fault and / or a switch controller fault. According to the invention, the working state of the AC load control circuit can be monitored, and whether the control circuit fails or not and the specific fault type can be determined.

Description

Technical Field

[0001] The present application relates to the technical field of AC load control detection, for example, to a fault detection device, a control circuit and an electronic device for an AC load control circuit. Background Art

[0002] In the related art, the on-off control of AC loads (such as compressors, electric heaters, solenoid valves, etc.) is mostly performed through switch controllers, such as relays or field effect transistors. For example, a relay is connected to the power line of the AC load, and the on and off of the relay contacts are controlled according to pre-set logic and rules, so that the AC load connected in series to the load end of the relay works or stops.

[0003] However, this type of control circuit lacks fault monitoring capability, that is, when a fault occurs in the control circuit, the system cannot know whether the fault has occurred.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0006] The embodiments of the present disclosure provide a fault detection device, a control circuit and an electronic device for an AC load control circuit, which can monitor the working state of the AC load control circuit and determine whether the control circuit is faulty and the specific fault type.

[0007] In some embodiments, a fault detection device for an AC load control circuit is provided, wherein the AC load control circuit includes a switch controller and an AC load connected in series; the fault detection device includes: a signal generating module, connected to a signal input terminal of the switch controller, configured to input a switching signal potential to the switch controller to switch the level state of the AC load; a detection module, connected in parallel with the AC load, configured to obtain a detection potential of the AC load under different level states, so as to determine a fault type of the AC load control circuit according to a correlation between the detection potential and the switching signal potential; wherein the fault type includes an AC load fault and / or a switch controller fault.

[0008] Optionally, the detection module includes: a voltage collection resistor connected in parallel with the AC load; and a detection submodule connected to the voltage collection resistor and configured to detect the potential of the voltage collection resistor in different level states to obtain a detection potential.

[0009] Optionally, the detection submodule includes: a rectifier circuit, whose current input terminal is connected to the voltage collection resistor and is configured to convert the input AC current into a DC current; a detection circuit, which is connected to the current output terminal of the rectifier circuit and is configured to detect the potential of the voltage collection resistor in different level states under a DC current state to obtain a detection potential.

[0010] Optionally, the detection circuit includes: a voltage-dividing resistor connected to the current output end of the rectifier circuit; and a detection element connected to the voltage-dividing resistor and configured to detect the potential of the voltage-dividing resistor in different level states to obtain a detection potential.

[0011] Optionally, the detection element includes: a voltage collector, connected in parallel with the voltage-dividing resistor, configured to detect the potential of the voltage-dividing resistor under different level states to obtain a detection potential; or, a current collector and a controller, wherein the current collector is connected in series with the voltage-dividing resistor, configured to collect a detection current flowing through the voltage-dividing resistor under different level states; and the controller is communicatively connected to the current collector, and configured to output a detection potential based on the detection current and the resistance value of the voltage collection resistor.

[0012] Optionally, when the triggering mode of the switch controller is high-level triggering, the fault type of the AC load control circuit is determined according to the correlation between the detection potential and the switching signal potential, including one or more of the following methods: when the detection potential is high when the switching signal potential is high, and when the switching signal potential is low, the detection potential is low, determining that the AC load control circuit is normal; when the switching signal potential is high, the detection potential is low, and when the switching signal potential is low, determining that the fault type of the AC load control circuit is a switch controller fault; when the switching signal potential is low, the detection potential is low. When the detection potential is high when the switching signal potential is high, and when the switching signal potential is low, the detection potential is high, the fault type of the AC load control circuit is determined to be a switch controller fault; when the detection potential is high when the switching signal potential is high, and when the switching signal potential is low, the detection potential is medium, the fault type of the AC load control circuit is determined to be an AC load fault; when the detection potential is medium when the switching signal potential is high, and when the switching signal potential is low, the detection potential is medium, the fault type of the AC load control circuit is determined to be a switch controller fault and an AC load fault.

[0013] Optionally, when the triggering mode of the switch controller is low-level triggering, the fault type of the AC load control circuit is determined according to the correlation between the detection potential and the switching signal potential, including one or more of the following methods: when the detection potential is high when the switching signal potential is low, and when the detection potential is low when the switching signal potential is high, it is determined that the AC load control circuit is normal; when the detection potential is low when the switching signal potential is low, and when the detection potential is low when the switching signal potential is high, it is determined that the fault type of the AC load control circuit is a switch controller fault; when the switching signal potential is When the detection potential is high when the switching signal potential is low, and when the detection potential is high when the switching signal potential is high, the fault type of the AC load control circuit is determined to be a switch controller fault; when the detection potential is high when the switching signal potential is low, and when the detection potential is medium when the switching signal potential is high, the fault type of the AC load control circuit is determined to be an AC load fault; when the detection potential is medium when the switching signal potential is low, and when the detection potential is medium when the switching signal potential is high, the fault type of the AC load control circuit is determined to be a switch controller fault and an AC load fault.

[0014] Optionally, the fault detection device further includes: a bypass resistor connected in parallel with the switch controller and configured to limit the current flowing into the AC load when the switch controller is disconnected.

[0015] In some embodiments, an AC load control circuit is provided, comprising: an AC load; a switch controller connected in series with the AC load; and a fault detection device of the AC load control circuit as described in the above embodiments, connected to the switch controller and the AC load.

[0016] In some embodiments, an electronic device is provided, comprising: an electronic device body; a fault detection device for an AC load control circuit as described in the above embodiment, installed in the electronic device body; or an AC load control circuit as described in the above embodiment, installed in the electronic device body.

[0017] The fault detection device, control circuit and electronic device of the AC load control circuit provided by the embodiments of the present disclosure can achieve the following technical effects:

[0018] The fault detection device of the AC load control circuit provided by the embodiment of the present disclosure can dynamically adjust the switching signal potential of the input switch controller through the signal generating module to switch the level state of the AC load. At the same time, a detection module is set in parallel with the AC load to detect the detection potential of the AC load under different level states. Then, based on the correlation between the detection potential and the switching signal potential, it is determined whether the AC load control circuit is faulty, and the specific fault type under the fault state. In summary, the embodiment of the present disclosure realizes the monitoring of the working state of the AC load control circuit, determines whether the control circuit is faulty and the specific fault type, and improves the functionality, practicality and user experience of the control circuit.

[0019] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0021] Figure 1 It is a schematic diagram of a fault detection device of an AC load control circuit provided by an embodiment of the present disclosure being arranged in the AC load control circuit;

[0022] Figure 2 is a schematic diagram of an AC load control circuit provided by an embodiment of the present disclosure;

[0023] Figure 3 is a schematic diagram of an AC load control circuit provided by another embodiment of the present disclosure;

[0024] Figure 4 It is a simulation schematic diagram of an AC load control circuit when the switch controller and the AC load are in a normal state and the switching signal potential is at a high level provided by an embodiment of the present disclosure;

[0025] Figure 5 It is a simulation schematic diagram of an AC load control circuit when the switch controller and the AC load are in a normal state and the switching signal potential is at a low level provided by an embodiment of the present disclosure;

[0026] Figure 6 It is a simulation schematic diagram of an AC load control circuit provided by an embodiment of the present disclosure when the AC load is normal and the switch controller is in a fault state and the switching signal potential is at a high level;

[0027] Figure 7It is a simulation schematic diagram of an AC load control circuit provided by an embodiment of the present disclosure when the AC load is normal and the switch controller is in a fault state and the switching signal potential is at a low level;

[0028] Figure 8 It is a simulation schematic diagram of an AC load control circuit provided by another embodiment of the present disclosure when the AC load is normal and the switch controller is in a fault state and the switching signal potential is at a high level;

[0029] Fig. 9 It is a simulation schematic diagram of an AC load control circuit provided by another embodiment of the present disclosure when the AC load is normal and the switch controller is in a fault state and the switching signal potential is at a low level;

[0030] Fig.10 It is a simulation schematic diagram of an AC load control circuit provided by an embodiment of the present disclosure when an AC load fails and a switch controller is in a normal state and the switching signal potential is at a high level;

[0031] Fig.11 It is a simulation schematic diagram of an AC load control circuit provided by an embodiment of the present disclosure when an AC load fails and a switch controller is in a normal state and the switching signal potential is at a low level;

[0032] Fig.12 It is a simulation schematic diagram of an AC load control circuit when the switching signal potential is at a high level in a switch controller and an AC load fault state provided by an embodiment of the present disclosure;

[0033] Fig.13 It is a simulation schematic diagram of an AC load control circuit when the switching signal potential is at a low level in a switch controller and an AC load fault state provided by an embodiment of the present disclosure;

[0034] Fig.14 is a schematic diagram of an electronic device provided by an embodiment of the present disclosure.

[0035] Reference numerals:

[0036] 1 electronic device; 10 electronic device body;

[0037] 20 AC load control circuit; 202 switch controller; 204 AC load; 206 AC power supply;

[0038] 30 Fault detection device for AC load control circuit; 310 Signal generation module; 320 Detection module; 322 Voltage acquisition resistor; 324 Detection submodule; 326 Rectification circuit; 328 Detection circuit; 330 Voltage divider resistor; 332 Detection element; 334 Voltage collector; 336 Bypass resistor. DETAILED DESCRIPTION

[0039] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0040] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0041] Unless otherwise stated, the term "plurality" means two or more.

[0042] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0043] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A, B, A and B.

[0044] The term "correspondence" may refer to an association relationship or a binding relationship. The correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

[0045] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0046] Combination Figures 1 to 3 As shown, the embodiment of the present disclosure provides a fault detection device 30 for an AC load control circuit, wherein the AC load control circuit 20 includes a switch controller 202 and an AC load 204 connected in series. The fault detection device 30 includes a signal generating module 310 and a detection module 320. The signal generating module 310 is connected to the signal input end of the switch controller 202, and is configured to input a switching signal potential to the switch controller 202 to switch the level state of the AC load 204. The detection module 320 is connected in parallel with the AC load 204, and is configured to obtain a detection potential of the AC load 204 under different level states, so as to determine the fault type of the AC load control circuit 20 according to the correlation between the detection potential and the switching signal potential. Among them, the fault type includes AC load fault and / or switch controller fault.

[0047] The fault detection device 30 of the AC load control circuit provided in the embodiment of the present disclosure can dynamically adjust the switching signal potential of the input switch controller 202 through the signal generating module 310 to switch the level state of the AC load 204. At the same time, a detection module 320 is set in parallel with the AC load 204 to detect the detection potential of the AC load 204 under different level states. Then, based on the correlation between the detection potential and the switching signal potential, it is determined whether the AC load control circuit 20 is faulty, and the specific fault type under the fault state. In summary, the embodiment of the present disclosure realizes monitoring of the working state of the AC load control circuit 20, determines whether the AC load control circuit 20 is faulty and the specific fault type, and improves the functionality, practicality and user experience of the AC load control circuit 20.

[0048] In this embodiment, the signal generating module 310 is connected to the signal input terminal of the switch controller 202, and is configured to input a switching signal potential to the switch controller 202. The switching signal is a digital signal, that is, the switching signal potential includes a high level (High Level) and a low level (Low Level). The high level refers to a high voltage state relative to the low level, and is often used to represent a logic "1" in a logic circuit. The low level refers to a low voltage state relative to the high level, and is often used to represent a logic "0" in a logic circuit. The voltage range of the high level and the low level depends on the specific scenario, circuit system, and component parameters used.

[0049] In the AC load control circuit 20, the triggering modes of the switch controller 202 include high-level triggering and low-level triggering. Specifically, high-level triggering: when the switching signal potential is high, the switch controller 202 is closed (such as the relay contact is closed or the field effect tube is turned on); when the switching signal potential is low, the switch controller 202 is disconnected (such as the relay contact is disconnected or the field effect tube is turned off). Low-level triggering: when the switching signal potential is low, the switch controller 202 is closed; when the switching signal potential is high, the switch controller 202 is disconnected. It should be noted that the specific triggering mode of the switch controller 202 needs to be determined according to the specific type and model of the switch controller 202.

[0050] In the process of the switch controller 202 realizing switching in response to the switching signal potential, the digital signal (switching signal) is converted into an analog signal (i.e., voltage or current) of the AC load 204. When the signal generating module 310 inputs the switching signal potential to the switch controller 202, and the switch controller 202 realizes switching in response to the switching signal potential, the voltage or current flowing through the AC load 204 changes, i.e., its level state changes. Therefore, by detecting the detection potential of the AC load 204 in different level states, according to the correlation between the detection potential and the switching signal potential, it can be determined whether the AC load control circuit 20 is faulty, and the specific fault type in the faulty state.

[0051] Optionally, combined Figure 2 and Figure 3 As shown, the AC load control circuit 20 further includes an AC power source 206. The AC power source 206 is connected in series with the switch controller 202, and is used to provide input AC current to the AC load 204 when the switch controller 202 is connected in series, so that the AC load 204 can work.

[0052] In order to facilitate the introduction of this application, Figure 1 and Figure 2 As shown, the resistor R1 and the switch S1 are used to simulate the AC load 204 in actual applications, the switch S2 and the power supply VCC (Volt Current Condenser, VCC) are used to simulate the signal generating module 310 (such as a microcontroller) in actual applications, and the relay K1 and the switch S3 are used to simulate the switch controller 202 in actual applications.

[0053] The on / off state of the switch S1 is switched to simulate the connection or disconnection of the AC load 204 in actual application. When the switch S1 is closed, the AC load 204 is connected and the AC load 204 is normal; when the switch S1 is opened, the AC load 204 is disconnected and the AC load 204 is faulty.

[0054] By switching the connection object of the switch S2, the high level or low level output of the simulated signal generating module 310 in actual application is realized. When the switch S2 is connected to the power supply VCC, the output is high level; when the switch S2 is grounded, the output is low level.

[0055] By switching and controlling the connection state of the switch S3, the fault state of the switch controller 202 in actual application is simulated. In actual application, when the switch controller 202 is closed, it can be considered that the switch controller 202 is short-circuited; when the switch controller 202 is disconnected, it can be considered that the switch controller 202 is open-circuited. In the simulation process, when the fault state of the switch controller 202 is unable to close, no matter how the switching signal potential changes, the switch S3 is always disconnected; when the fault state of the switch controller 202 is unable to disconnect, no matter how the switching signal potential changes, the switch S3 is always closed and directly connected to the AC load 204.

[0056] It should be understood that Figure 2 The AC load 204, the signal generating module 310, and the switch controller 202 are only for illustration.

[0057] In some embodiments, when the triggering mode of the switch controller 202 is high level triggering, the fault type of the AC load control circuit is determined according to the correlation between the detection potential and the switching signal potential as shown in Table 1.

[0058] Table 1

[0059]

[0060] In analog signals, the level refers to the relative size of the voltage or current in the circuit. Analog signals are continuously changing signals, and their voltage or current can take any value within a certain range. Therefore, the lower limit of the range can be defined as a low level, the middle value in the range (that is, the middle value between the highest and lowest voltages or currents) is defined as a medium level, and the upper limit of the range is defined as a high level.

[0061] Specifically, when the detection potential is at a high level when the switching signal potential is at a high level, and when the detection potential is at a low level when the switching signal potential is at a low level, it is determined that the AC load control circuit is normal.

[0062] In this embodiment, the switch controller 202 can correctly respond to the switching signal, and the AC load 204 can work as expected, so the AC load control circuit 20 is in a normal state.

[0063] Specifically, when the detection potential is low when the switching signal potential is high, and when the detection potential is low when the switching signal potential is low, it is determined that the fault type of the AC load control circuit is a switch controller fault, and the fault cause is that the switch controller cannot be turned on.

[0064] In this embodiment, when the switching signal potential is at a high level, the detection potential is at a low level, indicating that the AC load 204 fails to respond to the switching signal and works normally, and the AC load 204 does not obtain input current or the input current is too small to support the operation of the AC load 204, and the switch controller 202 may not respond to the switching signal potential and turn on. When the switching signal potential is switched to a low level, the detection potential is still at a low level, indicating that the working state of the AC load 204 does not change with the change of the switching signal potential, and it is determined that the switch controller fails, and the cause of the failure is that the switch controller 202 cannot be turned on and cannot provide a sufficient current to the AC load 204.

[0065] Specifically, when the detection potential is high when the switching signal potential is high, and when the detection potential is high when the switching signal potential is low, it is determined that the fault type of the AC load control circuit is a switch controller fault, and the fault cause is that the switch controller cannot be disconnected.

[0066] In this embodiment, when the switching signal potential is at a high level, the detection potential is at a high level, indicating that the switch controller 202 is in the on state at this time, and the AC load 204 can respond to the switching signal and work normally. When the switching signal potential is switched to a low level, the detection potential is still at a high level, indicating that with the change of the switching signal potential, the working state of the AC load 204 has not changed, then the switch controller fails, and the cause of the failure is that the switch controller 202 cannot be disconnected, causing the AC load 204 to continue to work.

[0067] Specifically, when the detection potential is high when the switching signal potential is high, and when the detection potential is medium when the switching signal potential is low, it is determined that the fault type of the AC load control circuit is AC load fault, and the fault cause is AC load circuit breakage.

[0068] In this embodiment, when the switching signal potential is at a high level, the detection potential is at a high level, indicating that the switch controller 202 is in the on state at this time, and the AC load 204 can respond to the switching signal and work normally. When the switching signal potential is switched to a low level, the detection potential is at a medium level. As the switching signal potential changes, the detection potential of the AC load 204 changes, indicating that there is a switching action in the switch controller 202. If the switch controller 202 works normally, the AC load fails, and the cause of the failure is that the AC load 204 is disconnected. Specifically, if the AC load 204 is disconnected, the detection potential will not be detected, or the detection potential is 0. When the switching signal potential is switched to a low level, the switch controller 202 is disconnected, the switch controller 202 is disconnected, and the AC load 204 is disconnected. In this case, the voltage across the AC load 204 is equal to half of the power supply voltage, that is, it is at a medium level.

[0069] Specifically, when the switching signal potential is at a high level and the detection potential is at a medium level, and when the switching signal potential is at a low level and the detection potential is at a medium level, the fault type of the AC load control circuit is determined to be a switch controller failure and an AC load failure, and the cause of the fault is that the switch control cannot be turned on and the AC load is open.

[0070] In this embodiment, when the switching signal potential is at a high level, the detection potential is at a medium level, and when the switching signal potential is at a low level, the detection potential is still at a medium level, indicating that with the change of the switching signal potential, the working state of the AC load 204 has not changed, and the switch controller is faulty. Since the detection potential of the AC load 204 is at a medium level when the switching signal potential is at a high level or a low level, it indicates that the AC load 204 is open-circuited and the switch controller 202 is open-circuited. Therefore, the fault types of the AC load control circuit 20 are switch controller fault and AC load fault, and the fault causes are that the switch controller 202 cannot be turned on and the AC load 204 is open-circuited.

[0071] In some embodiments, when the triggering mode of the switch controller 202 is low level triggering, the fault type of the AC load control circuit is determined according to the correlation relationship between the detection potential and the switching signal potential as shown in Table 2.

[0072] Table 2

[0073]

[0074] Specifically, when the switching signal potential is at a low level and the detection potential is at a high level, and when the switching signal potential is at a high level and the detection potential is at a low level, it is determined that the AC load control circuit is normal.

[0075] In this embodiment, the switch controller 202 can correctly respond to the switching signal, and the AC load 204 can work as expected, so the AC load control circuit 20 is in a normal state.

[0076] Specifically, when the detection potential is low when the switching signal potential is low, and when the detection potential is low when the switching signal potential is high, it is determined that the fault type of the AC load control circuit is a switch controller fault, and the fault cause is that the switch controller cannot be turned on.

[0077] In this embodiment, when the switching signal potential is at a low level, the detection potential is at a low level, indicating that the AC load 204 fails to respond to the switching signal and works normally, and the AC load 204 does not obtain input current or the input current is too small to support the operation of the AC load 204, and the switch controller 202 may not respond to the switching signal potential and turn on. When the switching signal potential is switched to a high level, the detection potential is still at a low level, indicating that the working state of the AC load 204 does not change with the change of the switching signal potential, and it is determined that the switch controller fails, and the cause of the failure is that the switch controller 202 cannot be turned on and cannot provide a sufficient current to the AC load 204.

[0078] Specifically, when the detection potential is high when the switching signal potential is low, and when the detection potential is high when the switching signal potential is high, it is determined that the fault type of the AC load control circuit is a switch controller fault, and the fault cause is that the switch controller cannot be disconnected.

[0079] In this embodiment, when the switching signal potential is at a low level, the detection potential is at a high level, indicating that the switch controller 202 is in the on state at this time, and the AC load 204 can respond to the switching signal and work normally. When the switching signal potential is switched to a high level, the detection potential is still at a high level, indicating that with the change of the switching signal potential, the working state of the AC load 204 has not changed, and the switch controller is faulty, and the fault reason is that the switch controller 202 cannot be disconnected, causing the AC load 204 to continue to work.

[0080] Specifically, when the switching signal potential is low and the detection potential is high, and when the switching signal potential is high and the detection potential is medium, the fault type of the AC load control circuit is determined to be an AC load fault, and the fault cause is an AC load circuit breaker.

[0081] In this embodiment, when the switching signal potential is at a low level, the detection potential is at a high level, indicating that the switch controller 202 is in the on state at this time, and the AC load 204 can respond to the switching signal and work normally. When the switching signal potential is switched to a high level, the detection potential is at a medium level. As the switching signal potential changes, the detection potential of the AC load 204 changes, indicating that the switch controller 202 has a switching action. If the switch controller 202 works normally, the AC load fails, and the cause of the failure is that the AC load 204 is disconnected.

[0082] Specifically, when the switching signal potential is at a low level and the detection potential is at a medium level, and when the switching signal potential is at a high level and the detection potential is at a medium level, the fault type of the AC load control circuit is determined to be a switch controller failure and an AC load failure, and the cause of the fault is that the switch controller cannot be turned on and the AC load is open.

[0083] In this embodiment, when the switching signal potential is at a low level, the detection potential is at a medium level, and when the switching signal potential is at a high level, the detection potential is still at a medium level, indicating that with the change of the switching signal potential, the working state of the AC load 204 does not change, and the switch controller is faulty. Since the detection potential of the AC load 204 is at a medium level when the switching signal potential is at a high level or a low level, it indicates that the AC load 204 is disconnected and the switch controller 202 is disconnected. Therefore, the fault types of the AC load control circuit 20 are switch controller fault and AC load fault, and the fault causes are that the switch controller 202 cannot be turned on and the AC load 204 is disconnected.

[0084] Optionally, combined Figure 2 and Figure 3 As shown, the detection module 320 includes a voltage collection resistor 322 and a detection submodule 324. The voltage collection resistor 322 is connected in parallel with the AC load 204. The detection submodule 324 is connected to the voltage collection resistor 322 and is configured to detect the potential of the voltage collection resistor 322 in different level states to obtain a detection potential.

[0085] In this embodiment, since the voltage acquisition resistor 322 is connected in parallel with the AC load 204, the voltage acquisition resistor 322 can sense the voltage change at both ends of the AC load 204 in real time. Since the resistor is a linear element, the voltage drop at both ends is proportional to the current flowing through it, so the voltage acquisition resistor 322 can accurately reflect the voltage of the AC load 204 at different levels. Then, the potential of the voltage acquisition resistor 322 at different levels is detected by the detection submodule 324, so as to accurately detect the detection potential of the AC load 204, improve the detection accuracy of the detection potential, and then improve the accuracy of the working state, fault type and fault cause judgment of the fault detection device.

[0086] In addition, the detection module 320 is formed by the voltage collection resistor 322 and the detection submodule 324, so that the detection module 320 can be integrated into other AC load control circuits to ensure the wide applicability and reliability of the fault detection device.

[0087] Optionally, combined Figure 2 As shown, the detection submodule 324 includes a rectifier circuit 326 and a detection circuit 328. The current input terminal of the rectifier circuit 326 is connected to the voltage collection resistor 322, and is configured to convert the input AC current into a DC current; the detection circuit 328 is connected to the current output terminal of the rectifier circuit 326, and is configured to detect the potential of the voltage collection resistor 322 in different level states in the DC current state to obtain the detection potential.

[0088] In this embodiment, the AC current is first converted into a DC current through the rectifier circuit 326, thereby eliminating the influence of the direction change of the AC current on the detection circuit 328, and suppressing the high-frequency noise and interference in the AC current, so that the detection circuit 328 can more stably measure the potential change of the voltage collection resistor 322 under different level states, further improving the detection accuracy of the detection potential, and improving the accuracy of the working state, fault type and fault cause judgment of the fault detection device.

[0089] In addition, in practical applications, the microcontroller in the electronic device collects DC signals, converts AC current into DC current through the rectifier circuit 326, and then obtains the detection potential of the AC load 204 under the DC current state, so as to further improve the wide applicability and reliability of the fault detection device.

[0090] Optionally, combined Figure 2 As shown, the detection circuit 328 includes a voltage-dividing resistor 330 and a detection element 332. The voltage-dividing resistor 330 is connected to the current output terminal of the rectifier circuit 326. The detection element 332 is connected to the voltage-dividing resistor 330 and is configured to detect the potential of the voltage-dividing resistor 330 in different level states to obtain a detection potential.

[0091] In this embodiment, the voltage-dividing resistor 330 is connected to the current output terminal of the rectifier circuit 326, and is used to divide the DC voltage output by the rectifier circuit 326 to match the input range of the detection element 332, thereby ensuring the safe and stable operation of the detection element 332. In addition, by adjusting the resistance value of the voltage-dividing resistor 330, the DC voltage output by the rectifier circuit 326 is reduced to within the optimal measurement range of the detection element 332, which can reduce the measurement error of the detection element 332 and improve the stability of the output signal of the detection element 332, thereby further improving the detection accuracy of the detection potential and improving the accuracy of the working state, fault type and fault cause judgment of the fault detection device.

[0092] Optionally, combined Figure 2 As shown, the detection element 332 includes a voltage collector 334. The voltage collector 334 is connected in parallel with the voltage-dividing resistor 330 and is configured to detect the potential of the voltage-dividing resistor 330 in different level states to obtain a detection potential.

[0093] In this embodiment, a voltage collector 334 is used as the detection element 332, and the voltage collector 334 is connected in parallel with the voltage divider resistor 330, so that the voltage collector 334 can directly obtain the potential value across the voltage divider resistor 330, thereby reducing the loss and interference in the signal transmission process, improving the detection rate of the potential, and improving the measurement accuracy of the detected potential.

[0094] Optionally, combined Figure 2As shown, there are multiple voltage-dividing resistors 330 , and the multiple voltage-dividing resistors 330 are connected in series in sequence, and the voltage collector 334 is connected in parallel with one of the voltage-dividing resistors 330 .

[0095] In this embodiment, there are multiple voltage-dividing resistors 330, and the multiple voltage-dividing resistors 330 are connected in series in sequence to divide the DC voltage output by the rectifier circuit 326 to different voltage-dividing resistors 330, reduce the voltage on each voltage-dividing resistor 330, and ensure the safe and stable operation of the detection element 332. In this embodiment, the resistance values ​​of the multiple voltage-dividing resistors 330 can be the same or different, and this application does not limit it.

[0096] Optionally, the detection element 332 includes a current collector and a controller. The current collector is connected in series with the voltage divider resistor 330 and is configured to collect the detection current flowing through the voltage divider resistor 330 at different levels. The controller is connected in communication with the current collector and is configured to output the detection potential according to the detection current and the resistance value of the voltage collection resistor 322.

[0097] In this embodiment, the current collector and the controller are used as the detection element 332, and the current collector is connected in series with the voltage divider resistor 330, so that the current collector can directly obtain the detection current flowing through the voltage divider resistor 330. The controller is connected to the current collector in communication, and can receive the detection current data sent by the current collector, and query the resistance value of the voltage divider resistor 330 at the same time, and use Ohm's law (U=IR, U represents voltage, I represents current, and R represents resistance value) to calculate the voltage across the voltage divider resistor 330, that is, the detection potential. In this embodiment, by simultaneously collecting current and (indirectly) voltage information, a comprehensive detection of the state of the detection circuit 328 is achieved, and the reliability of the fault detection device is improved.

[0098] Optionally, combined Figure 3 As shown, the detection submodule 324 includes a voltage collector 334. The voltage collector 334 is connected in parallel with the voltage collection resistor 322 and is configured to detect the potential of the voltage collection resistor 322 in different level states to obtain a detection potential.

[0099] In this embodiment, a voltage collector 334 is used as the detection submodule 324, and the voltage collector 334 is connected in parallel with the voltage collection resistor 322, so that the voltage collector 334 can directly obtain the potential value across the voltage collection resistor 322, thereby reducing the loss and interference in the signal transmission process and improving the detection rate of the potential.

[0100] Optionally, the detection submodule 324 includes a current collector and a controller. The current collector is connected in series with the voltage collection resistor 322 and is configured to collect the detection current flowing through the voltage collection resistor 322 at different levels. The controller is connected in communication with the current collector and is configured to output the detection potential according to the detection current and the resistance value of the voltage collection resistor 322.

[0101] In this embodiment, the current collector and the controller are used as the detection submodule 324, and the current collector is connected in series with the voltage collection resistor 322, so that the current collector can directly obtain the detection current flowing through the voltage collection resistor 322 in series. The controller is connected in communication with the current collector, and can receive the detection current data sent by the current collector, and at the same time query the resistance value of the voltage collection resistor 322, and use Ohm's law to calculate the voltage across the voltage collection resistor 322, that is, the detection potential. In this embodiment, by simultaneously collecting current and (indirectly) voltage information, a comprehensive detection of the detection module 320 is achieved, and the reliability of the fault detection device is improved.

[0102] Optionally, combined Figure 2 As shown, the rectifier circuit 326 includes a rectifier bridge. The current input end of the rectifier bridge is connected to the voltage collection resistor 322, and the current output end of the rectifier bridge is connected to the detection circuit 328.

[0103] A rectifier bridge is a circuit element that converts alternating current (AC) into direct current (DC). The rectifier bridge is composed of four diodes or similar semiconductor devices arranged in a bridge connection. In this embodiment, the current input end of the rectifier bridge receives the current from the voltage collection resistor 322, and the current output end outputs the rectified direct current, thereby realizing the conversion between the DC signal and the AC signal in the detection module 320.

[0104] Optionally, combined Figure 2 and Figure 3 As shown, the fault detection device further includes a bypass resistor 336. The bypass resistor 336 is connected in parallel with the switch controller 202 and is configured to limit the current flowing into the AC load 204 when the switch controller 202 is disconnected.

[0105] In this embodiment, the bypass resistor 336 is used to limit the current flowing into the AC load 204 when the switch controller 202 is disconnected, so as to prevent the AC load 204 from being directly exposed to high voltage, causing damage to the AC load 204, risk of electric shock or other safety issues.

[0106] In addition, when the detection module 320 includes the voltage collection resistor 322, the bypass resistor 336 can also divide the voltage with the voltage collection resistor 322 when both the switch controller 202 and the AC load 204 fail, so as to simulate the open circuit of the switch controller 202 and the AC load 204 in actual applications. In this embodiment, the bypass resistor 336 has the same resistance value as the voltage collection resistor 322.

[0107] It should be noted that the specific resistance values ​​of the voltage collection resistor 322, the voltage divider resistor 330 and the bypass resistor 336, as well as the specific number of the voltage divider resistor 330 in this application, need to be set by technicians according to the actual AC load control circuit, and this application does not limit them.

[0108] For example, Figure 2 Take the AC load control circuit 20 shown as an example. Among them, the number of the voltage divider resistors 300 is 3, namely, the voltage divider resistor R3, the voltage divider resistor R4 and the voltage divider resistor R5, R3 = 10kΩ, R4 = 200kΩ, R5 = 200kΩ, and the voltage divider resistors R3, R4 and R5 are connected in series in sequence. The voltage collector 334 is used as the detection element 332, and the voltage collector 334 is connected in parallel with the voltage divider resistor R3. The current input end of the voltage divider resistor R5 is connected to the current output end of the rectifier bridge D. The current input end of the rectifier bridge D is connected to the voltage collection resistor 332, and the voltage collection resistor R2 = 100kΩ. The voltage collection resistor 332 is connected in parallel with the AC load 204. The resistor R1 and the switch S1 simulate the AC load 204, and the resistor R1 = 6Ω. The AC power supply 206, the switch controller 202 and the AC load 204 are connected in series in sequence to form the AC load control circuit 20. The switch controller 202 is simulated by the relay K1 and the switch S3. The switch controller 202 is triggered by a high level. The signal input terminal of the switch controller 202 is connected to the signal generating module 310. The signal generating module 310 is simulated by the switch S2 and the power supply VCC. The bypass resistor 336 is connected in parallel with the switch controller 202, and the bypass resistor R6=100kΩ.

[0109] In this example, the voltage range that the voltage collector 334 can detect is 0 to 3V. When the detection potential is at 0V, the detection potential is a low level; when the detection potential is at 2V, the detection potential is a medium level; when the detection potential is at 3V, the detection potential is a high level. In the simulation process, if the obtained detection potential includes a decimal, the specific value of the detection potential can be simplified by rounding to facilitate level state judgment.

[0110] When the working state of the AC load control circuit 20 is normal, that is, the switch controller 202 and the AC load 204 are both normal (the switch S3 is connected to the relay K1, and the switch S1 is closed), Figure 4As shown, when the switching signal potential is high (switch S2 is connected to the power supply), the switch controller 202 can respond to the switching signal potential and turn on (relay K1 is closed), and the AC load 204 can work normally. The detection potential obtained by simulation is 3.07V, and the detection potential is high. Figure 5 As shown, when the switching signal potential is at a low level (switch S2 is grounded), the switch controller 202 can respond to the switching signal potential disconnection (relay K1 is disconnected), the AC load 204 stops working, and the simulated detection potential is 9.243uV, which is a low level.

[0111] When the AC load 204 works normally (the switch S1 is closed), the switch controller 202 fails, and the cause of the failure is that the switch controller 202 cannot be turned on (the switch S3 is disconnected from the relay K1). Figure 6 As shown, when the switching signal potential is high, the switch controller 202 cannot respond to the switching signal potential to achieve conduction (relay K1 is closed, and switch S3 is disconnected from relay K1), and the AC load 204 stops working. The detection potential obtained by simulation is 9.256uV, and the detection potential is low. Figure 7 As shown, when the switching signal potential is at a low level, the switch controller 202 is continuously in an off state (the relay K1 is disconnected, and the switch S3 is disconnected from the relay K1), the AC load 204 stops working, and the detection potential obtained by simulation is 9.242uV, which is a low level.

[0112] When the AC load 204 works normally (the switch S1 is closed), the switch controller 202 fails, and the cause of the failure is that the switch controller 202 cannot be disconnected (the switch S3 is directly connected to the closed AC load 204). Figure 8 As shown, when the switching signal potential is high, the switch controller 202 is in the on state (the relay K1 is closed, and the switch S3 is directly connected to the AC load 204), the AC load 204 works normally, and the detection potential obtained by simulation is 3.05V, which is a high level. Fig. 9 As shown, when the switching signal potential is at a low level, the switch controller 202 is continuously in the on state (the relay K1 is disconnected, and the switch S3 is directly connected to the closed AC load 204), the AC load 204 works normally, and the detection potential obtained by simulation is 3.052V, and the detection potential is at a high level.

[0113] When the AC load 204 fails and the cause of the failure is that the AC load 204 is disconnected (the switch S1 is disconnected), and the switch controller 202 works normally (the switch S3 is closed and connected to the relay K1), as shown in FIG. Fig.10As shown, when the switching signal potential is at a high level, the switch controller 202 can respond to the switching signal potential to be turned on, the AC load 204 is disconnected, and the detection potential obtained by simulation is 3.05V, which is a high level. Fig.11 As shown, when the switching signal potential is at a low level, the switch controller 202 responds to the switching signal potential being disconnected, the AC load 204 is disconnected, and the detection potential obtained by simulation is 2.005V, which is a medium level.

[0114] When both the AC load 204 and the switch controller 202 fail, and the cause of the failure is that the switch controller 202 cannot be turned on (the switch S3 is disconnected from the relay K1) and the AC load 204 is disconnected (the switch S1 is disconnected), as Fig.12 As shown, when the switching signal potential is at a high level, the switch controller 202 is in an off state, the AC load 204 is disconnected, and the detection potential obtained by simulation is 2.005V, which is a medium level. Fig.13 As shown, when the switching signal potential is at a low level, the switch controller 202 is continuously in an off state, the AC load 204 is disconnected, and the detection potential obtained by simulation is 2.004V, which is a medium level.

[0115] In some embodiments, an AC load control circuit 20 is provided. Figure 2 and Figure 3 As shown, the AC load control circuit 20 includes an AC load 204, a switch controller 202, and a fault detection device 30 for the AC load control circuit as described in the above embodiment. The switch controller 202 is connected in series with the AC load 204. The fault detection device 30 for the AC load control circuit is connected to the switch controller 202 and the AC load 204.

[0116] The AC load control circuit 20 provided in the embodiment of the present disclosure includes the fault detection device 30 of the AC load control circuit as described in the above embodiment. Therefore, the technical effects possessed by the fault detection device 30 of the AC load control circuit described in the above embodiment are also possessed by the embodiment of the present disclosure and will not be repeated here.

[0117] In practical applications, the switch controller 202 includes a relay or a field effect transistor. The AC load 204 includes a compressor, an electric heater or a solenoid valve.

[0118] In some embodiments, an electronic device 1 is provided. Fig.14 As shown, the electronic device 1 comprises an electronic device body 10 and a fault detection device 30 for an AC load control circuit as described in the above embodiment. The fault detection device 30 for an AC load control circuit is installed in the electronic device body 10.

[0119] The installation relationship described here is not limited to placement inside the electronic device body 10, but also includes installation connections with other components of the electronic device 1, including but not limited to physical connection, electrical connection or signal transmission connection, etc. It can be understood by those skilled in the art that the fault detection device 30 of the AC load control circuit can be adapted to a feasible electronic device 1, thereby realizing other feasible embodiments.

[0120] The electronic device 1 provided in the embodiment of the present disclosure includes the fault detection device 30 of the AC load control circuit as described in the above embodiment. Therefore, the technical effects possessed by the fault detection device 30 of the AC load control circuit described in the above embodiment are also possessed by the embodiment of the present disclosure and will not be repeated here.

[0121] In some embodiments, an electronic device 1 is provided. Fig.14 As shown, the electronic device 1 comprises an electronic device body 10 and an AC load control circuit 20 as described in the above embodiment. The AC load control circuit 20 is installed in the electronic device body 10.

[0122] The installation relationship described here is not limited to placement inside the electronic device body 10, but also includes installation connections with other components of the electronic device 1, including but not limited to physical connection, electrical connection or signal transmission connection, etc. It can be understood by those skilled in the art that the AC load control circuit 20 can be adapted to a feasible electronic device 1, thereby realizing other feasible embodiments.

[0123] The electronic device 1 provided in the embodiment of the present disclosure includes the AC load control circuit 20 as described in the above embodiment. Therefore, the technical effects possessed by the AC load control circuit 20 described in the above embodiment are also possessed by the embodiment of the present disclosure and will not be repeated here.

[0124] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes.

[0125] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of listings containing one or more associated ones. In addition, when used in the present application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method or device comprising the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0126] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods for each specific application to implement the described functions, but such implementations should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0127] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units can be only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiment of the present disclosure may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0128] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A fault detection device for an AC load control circuit, characterized in that: The AC load control circuit includes a switch controller and an AC load connected in series; the fault detection device includes: A signal generating module is connected to the signal input terminal of the switch controller and is configured to input a switching signal potential to the switch controller to switch the level state of the AC load; The detection module is connected in parallel with the AC load and is configured to obtain the detection potential of the AC load under different level states, so as to determine the fault type of the AC load control circuit according to the correlation between the detection potential and the switching signal potential; wherein the fault type includes AC load fault and / or switch controller fault.

2. The fault detection device according to claim 1, characterized in that: The detection module includes: The voltage collection resistor is connected in parallel with the AC load; The detection submodule is connected to the voltage collection resistor and is configured to detect the potential of the voltage collection resistor in different level states to obtain the detection potential.

3. The fault detection device according to claim 2, characterized in that: The detection submodules include: A rectifier circuit, the current input end of which is connected to the voltage collection resistor, is configured to convert the input AC current into a DC current; The detection circuit is connected to the current output terminal of the rectifier circuit and is configured to detect the potential of the voltage acquisition resistor in different level states under the direct current state to obtain the detection potential.

4. The fault detection device according to claim 3, characterized in that: The detection circuit includes: A voltage dividing resistor is connected to the current output terminal of the rectifier circuit; The detection element is connected to the voltage-dividing resistor and is configured to detect the potential of the voltage-dividing resistor in different level states to obtain a detection potential.

5. The fault detection device according to claim 4, characterized in that: The detection elements include: A voltage collector is connected in parallel with the voltage divider resistor and is configured to detect the potential of the voltage divider resistor at different levels to obtain a detection potential; or, A current collector and a controller, wherein the current collector is connected in series with a voltage-dividing resistor and is configured to collect detection currents flowing through the voltage-dividing resistor under different voltage levels; the controller is communicatively connected with the current collector and is configured to output a detection potential according to the detection current and the resistance value of the voltage-collecting resistor.

6. The fault detection device according to any one of claims 1 to 5, characterized in that: When the trigger mode of the switch controller is high level trigger, the fault type of the AC load control circuit is determined according to the correlation between the detection potential and the switching signal potential, including one or more of the following methods: When the detection potential is at a high level when the switching signal potential is at a high level, and when the detection potential is at a low level when the switching signal potential is at a low level, it is determined that the AC load control circuit is normal; When the detection potential is at a low level when the switching signal potential is at a high level, and when the detection potential is at a low level when the switching signal potential is at a low level, determining that the fault type of the AC load control circuit is a switch controller fault; When the detection potential is high when the switching signal potential is high, and when the detection potential is high when the switching signal potential is low, determining that the fault type of the AC load control circuit is a switch controller fault; When the detection potential is at a high level when the switching signal potential is at a high level, and when the detection potential is at a medium level when the switching signal potential is at a low level, determining that the fault type of the AC load control circuit is an AC load fault; When the detection potential is at a medium level when the switching signal potential is at a high level, and when the detection potential is at a medium level when the switching signal potential is at a low level, it is determined that the fault type of the AC load control circuit is a switch controller fault and an AC load fault.

7. The fault detection device according to any one of claims 1 to 5, characterized in that: When the trigger mode of the switch controller is low level trigger, the fault type of the AC load control circuit is determined according to the correlation between the detection potential and the switching signal potential, including one or more of the following methods: When the detection potential is high when the switching signal potential is low, and when the detection potential is low when the switching signal potential is high, it is determined that the AC load control circuit is normal; When the detection potential is low when the switching signal potential is low, and when the detection potential is low when the switching signal potential is high, the fault type of the AC load control circuit is determined to be a switch controller fault; When the detection potential is high when the switching signal potential is low, and when the detection potential is high when the switching signal potential is high, determining that the fault type of the AC load control circuit is a switch controller fault; When the switching signal potential is at a low level and the detection potential is at a high level, and when the switching signal potential is at a high level and the detection potential is at a medium level, determining that the fault type of the AC load control circuit is an AC load fault; When the detection potential is at a medium level when the switching signal potential is at a low level, and when the detection potential is at a medium level when the switching signal potential is at a high level, it is determined that the fault type of the AC load control circuit is a switch controller fault and an AC load fault.

8. The fault detection device according to any one of claims 1 to 5, characterized in that: Also includes: The shunt resistor, connected in parallel with the switch controller, is configured to limit the current flowing into the AC load when the switch controller is turned off.

9. An AC load control circuit, characterized in that: include: AC load; A switch controller is connected in series with the AC load; The fault detection device for an AC load control circuit according to any one of claims 1 to 8, connected to a switch controller and an AC load.

10. An electronic device, characterized in that: include: Electronic device body; The fault detection device for an AC load control circuit according to any one of claims 1 to 8, mounted on a body of an electronic device; Alternatively, the AC load control circuit as claimed in claim 9 is installed in an electronic device body.

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