Intelligent solid-state relay circuit with fault detection function

Abstract

The invention provides an intelligent solid-state relay circuit with a fault detection function, which comprises an isolation power supply module, a fault detection module, an isolation fault warning module and an output switch device, and is characterized in that the isolation power supply module is used for providing an isolated power supply for the fault detection module; the fault detection module is connected in series with an output switching device so as to be used for fault detection of the output switching device, and when the output switching device breaks down, the fault detection module feeds back a fault signal to the isolation fault warning module; and the isolation fault warning module comprises a fault detection terminal and is used for receiving the fault signal and sending out a fault warning. According to the technical scheme of the invention, on the basis of realizing fault detection of the intelligent solid-state relay, the space occupied by the circuit is reduced, and the circuit cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic power, and particularly to an intelligent solid-state relay circuit with a fault detection function. Background Art

[0002] With the continuous development of industrial automation, as an electronic component, the intelligent solid-state relay has been widely used in the fields of industrial control, household appliances, etc. due to its advantages of high efficiency, reliability, safety, long service life, etc., and its prospect is becoming broader and broader. Correspondingly, the fault diagnosis of the intelligent solid-state relay circuit has become a very important issue.

[0003] At present, various intelligent solid-state relay fault detection circuits have emerged and are frequently used in actual industrial production and household life. The existing intelligent solid-state relay fault detection circuits are generally composed of integrated circuits or other circuits. Such circuits not only have higher production costs and sales prices in practical applications, but also have the problem that the product volume is relatively large and it is difficult to adapt to some household or industrial control, greatly reducing the competitiveness and adaptability of the product.

[0004] Therefore, a technical solution is needed to reduce the space occupied by the circuit and the circuit cost on the basis of realizing the fault detection of the intelligent solid-state relay. Summary of the Invention

[0005] The present invention aims to provide an intelligent solid-state relay circuit with a fault detection function, which can reduce the space occupied by the circuit and the circuit cost on the basis of realizing the fault detection of the intelligent solid-state relay.

[0006] According to an aspect of the present invention, there is provided an intelligent solid-state relay circuit with a fault detection function, including: an isolated power supply module, a fault detection module, an isolated fault warning module, and an output switching device, wherein:

[0007] The isolated power supply module is used to provide an isolated power supply to the fault detection module;

[0008] The fault detection module is connected in series with the output switching device for fault detection of the output switching device. When a fault occurs in the output switching device, the fault detection module feeds back a fault signal to the isolated fault warning module;

[0009] The isolated fault warning module includes a fault detection terminal for receiving the fault signal and giving a fault warning;

[0010] The isolated power supply module is electrically connected to the fault detection module. The fault detection module includes a fault signal generator, and the isolated fault warning module includes a fault signal receiver for receiving the fault signal from the fault signal generator.

[0011] According to some embodiments, the fault detection module includes a current-limiting resistor to prevent overcurrent in the fault detection module.

[0012] According to some embodiments, the fault detection module includes a diode. The positive electrode of the diode is electrically connected to the fault signal generator, and the reverse cut-off characteristic of the diode is applied to protect the circuit of the fault detection module.

[0013] According to some embodiments, when there is a leakage current in the output switch, the fault signal generator sends a fault signal to the isolation fault warning module.

[0014] According to some embodiments, when receiving the fault signal, the fault signal receiver conducts to warn of the fault.

[0015] According to some embodiments, the fault signal generator includes a light-emitting diode, and the fault signal receiver includes a photosensitive element.

[0016] According to some embodiments, the photosensitive element is connected between the fault detection terminal and the power ground. When the photosensitive element conducts upon receiving the fault signal, the fault detection terminal outputs a low level to warn of the fault.

[0017] According to some embodiments, the fault signal generator and the fault signal receiver are matching electrical components that satisfy signal transmission in an isolated manner and / or an isolation control device that transmits signals in an isolated manner and controls the circuit inside the same electrical component.

[0018] According to some embodiments, the output switching device includes: a bipolar junction transistor, a metal-oxide-semiconductor field-effect transistor, a silicon-controlled rectifier, a thyristor, an insulated gate bipolar transistor.

[0019] According to some embodiments, the intelligent solid-state relay circuit further includes a control drive isolation module for providing a control signal to the intelligent solid-state relay.

[0020] According to an embodiment of the present invention, the isolation power supply module provides an isolated power supply for the fault detection module, improving the safety and reliability of the fault detection circuit. The intelligent solid-state relay is monitored in real time by the fault detection module. When a fault occurs, a fault signal is sent to the isolation fault warning module, and the isolation fault warning module issues a fault warning.

[0021] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments.

[0023] Figure 1 The schematic diagram of the device for the intelligent solid-state relay fault detection circuit according to an exemplary embodiment is shown.

[0024] Figure 2 The schematic diagram of the fault detection module for the intelligent solid-state relay fault detection circuit according to an exemplary embodiment is shown.

[0025] Figure 3 The circuit schematic diagram for the intelligent solid-state relay fault detection circuit according to an exemplary embodiment is shown.

[0026] Figure 4 The actual circuit diagram for the intelligent solid-state relay fault detection circuit according to an exemplary embodiment is shown. Detailed implementation manners

[0027] Now, the exemplary embodiments will be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. Identical reference numerals in the figures denote identical or similar parts, and thus their repetitive description will be omitted.

[0028] In addition, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present invention. However, those skilled in the art will realize that the technical solutions of the present invention can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the present invention.

[0029] The block diagrams shown in the drawings are only functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0030] The flowcharts shown in the drawings are only illustrative and do not necessarily include all the contents and operations / steps, nor do they necessarily need to be executed in the described order. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined. Therefore, the actual execution order may change according to the actual situation.

[0031] It should be understood that although terms such as first, second, and third may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another. Thus, the first component discussed below may be referred to as the second component without departing from the teachings of the inventive concept. As used herein, the term "and / or" includes any one of the associated listed items and all combinations of one or more of them.

[0032] The user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present invention are all information and data that have been authorized by the user or fully authorized by all parties, and the collection, use, and processing of the relevant data need to comply with the relevant laws, regulations, and standards of the relevant countries and regions, and corresponding operation entrances are provided for the user to select authorization or rejection.

[0033] Those skilled in the art can understand that the drawings are only schematic diagrams of exemplary embodiments, and the modules or processes in the drawings are not necessarily essential for implementing the present invention, so they cannot be used to limit the protection scope of the present invention.

[0034] At present, intelligent solid-state relays, as a kind of electronic components, are widely used in the fields of industrial control, household appliances, etc., and their prospects are becoming more and more broad. Correspondingly, the fault diagnosis of intelligent solid-state relay circuits has become a very important issue.

[0035] Various intelligent solid-state relay fault detection circuits have emerged and are frequently used in actual industrial production and household life. The existing intelligent solid-state relay fault detection circuits are generally composed of integrated circuits or other circuits, etc. Such circuits not only have a relatively high production cost and sales price in practical applications, but also have the problem that the product volume is relatively large and it is difficult to adapt to some household or industrial control, which greatly reduces the competitiveness and adaptability of the product.

[0036] Therefore, a technical solution is needed to reduce the space occupied by the circuit and the circuit cost on the basis of realizing the fault detection of intelligent solid-state relays, so that the intelligent solid-state relay fault detection circuit can be more widely applied to various production and life scenarios.

[0037] Before describing the embodiments of the present invention, some terms or concepts related to the embodiments of the present invention are explained.

[0038] The MOS field-effect transistor, also known as MOSFET or Metal-Oxide-Semiconductor Field-Effect Transistor, is a commonly used semiconductor component and is often used in amplification and switching circuits.

[0039] IGBT (Insulated Gate Bipolar Transistor) is a power semiconductor device that can be used to drive high-current loads, such as electric motors or heating elements. The IGBT combines the advantages of MOSFET and bipolar transistors and can operate in high-voltage, high-speed, and high-current environments.

[0040] The exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0041] Figure 1 The schematic diagram of the device for the intelligent solid-state relay fault detection circuit according to the exemplary embodiment is shown.

[0042] See Figure 1 , in the figure, an intelligent solid-state relay circuit with a fault detection function is shown, including: an isolated power supply module 101, a fault detection module 103, an isolated fault warning module 105, and an output switching device U3.

[0043] The isolated power supply module 101 is used to provide an isolated power supply to the fault detection module 103.

[0044] According to some embodiments, the isolated power supply module 101 is used to provide an isolated power supply to the fault detection module 103. The isolated power supply module 101 can be an optically isolated photovoltaic conversion module or use an isolation transformer to convert the power supply, and output an isolated power supply to provide electrical energy to the fault detection module 103.

[0045] The fault detection module 103 is connected in series with the output switching device U3 for fault detection. When a fault occurs in the output switching device U3, a fault signal is fed back to the isolated fault warning module 105.

[0046] According to some embodiments, the isolated fault warning module 103 receives the fault signal generated by the fault detection module 103, conducts after receiving the fault signal, and issues a fault warning.

[0047] According to some embodiments, the fault warning may include lighting a fault indicator, emitting a buzzer alarm, or configuring a voice broadcast function according to actual environmental requirements, and performing voice broadcasts on the occurred fault and possible fault impacts and other warning behaviors.

[0048] The isolated power supply module 101 is electrically connected to the fault detection module 103, and the fault detection module 103 includes a fault signal generator (for example, a light-emitting diode).

[0049] According to some embodiments, the isolated power supply module 101 is electrically connected to the fault detection module 103. The fault detection module 103 uses the isolated power supply provided by the isolated power supply module 101 to detect faults of the intelligent solid-state relay, improving the safety of device use.

[0050] According to some embodiments, the first terminal 10301 and the second terminal 10303 are electrically connected to both ends of the output switching device U3 in the detected intelligent solid-state relay to monitor the leakage current of the output switching device in real time.

[0051] According to some embodiments, the fault detection module 103 has a fault signal generator (for example, a photosensitive device). When it is detected that there is a leakage current at both ends of the output switching device and the leakage current reaches a certain threshold, the fault detection module 103 uses the fault signal generator to send a fault signal to the isolated fault warning module 105.

[0052] The isolated fault warning module 105 includes a fault signal receiver that receives the fault signal from the fault signal generator.

[0053] According to some embodiments, the isolated fault warning module 105 includes a fault signal receiver that receives the fault signal from the fault signal generator through the fault signal receiver. When the fault signal receiver receives the fault signal, the fault signal receiver conducts to generate a fault warning.

[0054] Figure 1 In the shown fault detection circuit, the isolated power supply module includes an isolated power conversion device that provides an isolated power supply for the fault detection module.

[0055] According to some embodiments, the isolated power supply module 101 includes an isolated power conversion device that provides an isolated power supply for the fault detection module 103. The isolated power conversion device can be selected according to different application scenarios. Usually, an optically isolated photovoltaic conversion module can be selected, or an isolated transformer can be used to achieve power conversion, and an isolated voltage source is output to provide electrical energy for the subsequent detection circuit.

[0056] Figure 2 Schematic diagram of a fault detection module for an intelligent solid-state relay fault detection circuit according to an exemplary embodiment is shown.

[0057] See Figure 2 , the fault detection module 103 includes a current-limiting resistor R1 to prevent overcurrent of the fault detection module.

[0058] According to some embodiments, the fault detection module 103 includes a current-limiting resistor R1, and the resistance value of the current-limiting circuit R1 is selected according to the parameters of the detected intelligent solid-state relay. Generally, a current-limiting resistor is often connected in series in a circuit to limit the magnitude of the current in the branch where it is located. By using a current-limiting resistor with a certain resistance value, the current at the load end is reduced to prevent the components connected in series from being burned out due to excessive current.

[0059] The fault detection module 103 includes a diode D2, and the positive electrode of the diode is electrically connected to the fault signal generator. The reverse cut-off characteristic of the diode is used to protect the circuit of the fault detection module.

[0060] According to some embodiments, the fault detection module 103 includes a diode D2, and the positive electrode of the diode D2 is electrically connected to the fault signal generator D1. When the diode D2 is added to the fault detection module 103 and connected in series to the circuit, it allows current to flow in one direction and blocks its reverse flow, thus effectively protecting the circuit from damage. When the above problems occur, the diode resistance becomes very high, blocking the reverse flow of current and preventing circuit damage, thereby protecting the circuit of the fault detection module 103.

[0061] According to some embodiments, the fault detection module 103 further includes a fault signal generator D1. When a leakage current is detected at both ends of the output switching device and the leakage current reaches a certain threshold, the fault detection module 103 uses the fault signal generator D1 to send out a fault signal. Referring to the example in the figure, the fault signal generator D1 can be a light-emitting diode. Correspondingly, the fault signal is an optical signal, and the fault signal receiver can be implemented by a photoresistor or a phototransistor.

[0062] Figure 3 Shows a circuit schematic diagram for the fault detection circuit of an intelligent solid-state relay according to an exemplary embodiment.

[0063] Figure 3 The circuit schematic diagram of the fault detection circuit is shown in Figure 3 , and the isolation fault warning module 105 includes a fault signal receiver U2.

[0064] According to some embodiments, the fault signal receiver U2 is turned on or off according to the received fault signal. Referring to the example in Figure 3 , the fault signal receiver U2 is implemented by a phototransistor. The phototransistor U2 receives the optical signal, that is, the fault signal, emitted from the diode D1. When the fault signal is received, the phototransistor U2 conducts, and the isolation fault warning module 105 issues a fault warning.

[0065] When there is a leakage current in the output switch device U3 of the intelligent solid-state relay, the fault signal generator D1 sends a fault signal to the isolation fault warning module 105.

[0066] According to some embodiments, if there is a leakage current and the leakage current reaches a certain threshold, the fault signal generator D1, i.e., the light-emitting diode D1, conducts and sends an optical signal to the isolation fault warning module 105 as a fault signal.

[0067] When receiving the fault signal, the fault signal receiver U2 conducts to give a warning about the fault.

[0068] According to some embodiments, the internal warning circuit of the isolation fault warning module 105 can be adaptively adjusted according to the actual scenario requirements. The specific warning operations can include a fault warning light, a fault voice prompt, a buzzer alarm, etc.

[0069] The fault signal generator includes a light-emitting diode, and the fault signal receiver includes a photosensitive element.

[0070] According to some embodiments, the fault signal generator D1 and the fault signal receiver U2 are matching electrical components that satisfy signal transmission in an isolated manner, such as Figure 3 in the example of, the fault signal generator D1 is implemented by using the light-emitting diode D1, and the fault signal receiver U2 is implemented by using the photosensitive triode U2.

[0071] The photosensitive element U2 is connected between the fault detection terminal AM and the power ground. When the photosensitive element U2 receives the fault signal and conducts, the fault detection terminal AM outputs a low level for fault warning.

[0072] According to some embodiments, the photosensitive element U2 is connected between the fault detection terminal AM and the power ground. When a fault occurs, the light-emitting diode D1 in the fault detection module lights up, and the photosensitive element U2 receives the optical signal and conducts. At this time, the fault detection terminal AM outputs a low level for fault warning.

[0073] The fault signal generator and the fault signal receiver are matching electrical components that satisfy signal transmission in an isolated manner and / or isolation control devices that transmit signals in an isolated manner and control the circuit inside the same electrical component.

[0074] According to some embodiments, the fault signal generator D1 and the fault signal receiver U2 are matching electrical components that satisfy signal transmission in an isolated manner, such as Figure 3In the example, the fault signal generator D1 is implemented by using a light-emitting diode D1, and the fault signal receiver U2 is implemented by using a photosensitive triode U2. In addition, it can be implemented by using an isolation control device that transmits signals in isolation and controls the circuit inside the same electrical component. For example, an optocoupler can be used to implement the functions of the fault signal generator D1 and the fault signal receiver U2.

[0075] Figure 4 Fig. shows the actual circuit diagram of the fault detection circuit for the intelligent solid-state relay according to the example embodiment.

[0076] See Figure 4 , Figure 4 Fig. shows the simple connection method of the fault detection circuit in the intelligent solid-state relay. In addition to the devices described above in the text, the output switching device U3 may include a crystal triode, a MOS field-effect transistor, a thyristor, a silicon-controlled rectifier, or an IGBT.

[0077] According to some embodiments, the output switching device in the detected intelligent solid-state relay is a thyristor device with switching characteristics in the intelligent solid-state relay. Generally, after the internal integrated circuit in the intelligent solid-state relay judges overcurrent or overvoltage, an output control signal is sent to the thyristor device with switching characteristics, and the thyristor device with switching characteristics performs turning on or off.

[0078] According to some embodiments, the output switching device with switching characteristics in the intelligent solid-state relay may be a crystal triode, a MOS field-effect transistor, a thyristor, a silicon-controlled rectifier, an IGBT, etc.

[0079] According to some embodiments, the isolated power supply module applied in the fault detection circuit designed by the present invention provides an isolated power supply for the detection circuit, improving the safety and reliability of the circuit.

[0080] The intelligent solid-state relay circuit further includes a control drive isolation module 107 for providing a control signal to the intelligent solid-state relay.

[0081] According to some embodiments, the intelligent solid-state relay circuit sends a control signal to the output switching device of the intelligent solid-state relay through the control drive isolation module 107 to control the conduction or cutoff of the intelligent solid-state relay circuit.

[0082] See Figure 4 , the photosensitive triode U2 can also be a Darlington photosensitive triode. When the light-emitting diode D1 emits light, the photosensitive triode U2 conducts, indicating that the switching device U3 has a fault. When the light-emitting diode D1 does not emit light, the photosensitive triode U2 is cut off, indicating that the switching device U3 has no fault.

[0083] Such asFigure 4 As shown, when performing fault detection, switches S2 and S3 are disconnected, and switch S1 is closed. At this time, the isolated power supply module U1 generates an isolated output voltage and supplies power to the subsequent detection circuit. The isolated power supply module U1, resistor R1, light-emitting diode D1, switching diode D2, and switching device U3 form a loop. Resistor R1 is a current-limiting resistor to prevent the detection current from exceeding the detection range. The function of switching diode D2 is to protect the detection circuit through the reverse cut-off voltage of the switching diode to prevent the output voltage from damaging the detection circuit. If there is no abnormal leakage current in switching device U3, it is equivalent to an open state, there is no current in the loop, so light-emitting diode D1 will not emit a light signal, and photosensitive triode U2 will not receive an effective light signal. Therefore, photosensitive triode U2 will not conduct, and the fault detection terminal AM is at a high level, indicating that the solid-state relay output switching device U3 is normal. If the leakage current of switching device U3 is abnormal and exceeds the threshold, the loop is in a conducting state, and light-emitting diode D1 will emit a light signal. Therefore, photosensitive triode U2 receives the light signal and conducts, and the fault detection terminal AM becomes a low level, and the solid-state relay output switching device U3 is abnormal. In this way, the fault warning module can judge whether there is abnormal leakage current in the output switching device U3 of the intelligent solid-state relay, that is, whether the intelligent solid-state relay fails, through the high and low levels of the fault detection terminal AM. When the intelligent solid-state relay is in normal use, switch S1 is disconnected, and at this time the fault detection circuit stops working. When switches S2 and S3 are closed, the solid-state relay output switching device U2 conducts, and there is current flowing through the load resistor RL. Due to the reverse polarity effect of switching diode D2, the load voltage will not affect the fault detection circuit, and the fault detection circuit will not function.

[0084] According to some embodiments, the fault detection circuit designed by the present invention uses simple and few electrical components to realize the fault detection of the intelligent solid-state relay, which is simpler than the existing fault detection circuits, has a relatively lower cost, and occupies less space in the actual circuit.

[0085] According to some embodiments, the fault detection circuit designed by the present invention occupies less space than the existing fault detection circuits, enabling it to be more widely and flexibly applied to industrial production and life scenarios.

[0086] The "unit" and "module" in this specification refer to software and / or hardware that can independently complete or cooperate with other components to complete specific functions, where the hardware can be, for example, a field programmable gate array, an integrated circuit, etc.

[0087] ​It should be noted that, for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0088] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0089] In several embodiments provided by the present invention, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of units is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some service interfaces. The indirect coupling or communication connection of the device or unit can be in an electrical or other form.

[0090] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0091] In addition, in each embodiment of the present invention, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0092] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in each embodiment of the present invention.

[0093] In the above embodiments, the descriptions of the respective embodiments have their own focuses. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0094] The exemplary embodiments of the present invention have been specifically shown and described above. It should be understood that the present invention is not limited to the detailed structures, arrangements or implementation methods described herein; on the contrary, the present invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. An intelligent solid-state relay circuit with a fault detection function, characterized in that, it includes: an isolation power supply module, a fault detection module, an isolation fault warning module, and an output switching device, where: the isolation power supply module is used to provide an isolated power supply to the fault detection module; the fault detection module is connected in series with the output switching device for fault detection of the output switching device. When a fault occurs in the output switching device, the fault detection module feeds back a fault signal to the isolation fault warning module; the isolation fault warning module includes a fault detection terminal for receiving the fault signal and giving a fault warning; the isolation power supply module is electrically connected to the fault detection module. The fault detection module includes a fault signal generator, and the isolation fault warning module includes a fault signal receiver for receiving the fault signal from the fault signal generator.

2. The intelligent solid-state relay circuit according to claim 1, characterized in that, the fault detection module includes a current-limiting resistor to prevent overcurrent in the fault detection module.

3. The intelligent solid-state relay circuit according to claim 1, characterized in that, the fault detection module includes a diode. The positive electrode of the diode is electrically connected to the fault signal generator, and the reverse cut-off characteristic of the diode is used to protect the circuit of the fault detection module.

4. The intelligent solid-state relay circuit according to claim 1, characterized in that, when there is a leakage current in the output switching device, the fault signal generator sends a fault signal to the isolation fault warning module.

5. The intelligent solid-state relay circuit according to claim 1, characterized in that, when receiving the fault signal, the fault signal receiver conducts to give a warning about the fault.

6. The intelligent solid-state relay circuit according to claim 1, characterized in that, the fault signal generator includes a light-emitting diode, and the fault signal receiver includes a photosensitive element.

7. The intelligent solid-state relay circuit according to claim 1, characterized in that, the photosensitive element is connected between the fault detection terminal and the power ground. When the photosensitive element conducts upon receiving the fault signal, the fault detection terminal outputs a low level for fault warning.

8. The intelligent solid-state relay circuit according to claim 1, characterized in that, the fault signal generator and the fault signal receiver are matching electrical components that meet the requirement of transmitting signals in an isolated manner and / or an isolation control device that transmits signals in an isolated manner and controls the circuit inside the same electrical component.

9. The intelligent solid-state relay circuit according to claim 1, characterized in that, the output switching device includes: a crystal triode, a metal-oxide semiconductor field-effect transistor, a thyristor, a silicon-controlled rectifier, an insulated gate bipolar transistor.

10. The intelligent solid-state relay circuit according to claim 1, characterized in that, the intelligent solid-state relay circuit further includes a control drive isolation module for providing a control signal to the intelligent solid-state relay.

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