Fault current detection device and method applied to intelligent switch

Abstract

The present application discloses a fault current detection device and method for intelligent switches. The fault current detection device includes a power supply module, a Hall current detection module and a signal amplification processing module. The power supply module is used to power the Hall current detection module. The Hall current detection module collects the current signal in the target circuit and sends the current signal to the signal amplification processing module. The target circuit is used to power the target device. The signal amplification processing module compares the voltage value represented by the current signal with the set threshold value. When the voltage value represented by the current signal is greater than or equal to the threshold value, the signal amplification processing module amplifies the current signal and outputs it as a fault current signal. By using the Hall current detection module instead of the fuse for fault current detection, the current signal detected by the Hall current detection module can be output as a fault current signal after being compared and processed and amplified by the signal amplification processing module, thereby realizing timely detection of the fault current.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and more specifically, to a fault current detection device and method applied to an intelligent switch. Background Art

[0002] Electronic switch products currently use fuses as fault current detection for the total circuit. Since the safety regulations require that the fuse must have a high breaking capacity of 1500A, the fuse will be very large, and the upper limit of the fuse current for the total circuit is relatively high, so it is easy to fail to limit the fault current in time. Furthermore, when the fault current of a single circuit causes the total fuse to burn out, other current circuits that have not experienced a fault cannot be used normally. Summary of the invention

[0003] In view of the above problems, the present application provides a fault current detection device and method applied to an intelligent switch to improve the above problems.

[0004] This application achieves the above-mentioned purpose through the following technical solutions.

[0005] In a first aspect, an embodiment of the present application provides a fault current detection device for an intelligent switch, comprising: a power supply module, a Hall current detection module and a signal amplification processing module, wherein the power supply module is coupled to the Hall current detection module, and the Hall current detection module is coupled to the signal amplification processing module; the power supply module is used to supply power to the Hall current detection module; the Hall current detection module is used to collect a current signal in a target circuit and send the current signal to the signal amplification processing module, and the target circuit is used to supply power to a target device; the signal amplification processing module is used to compare a voltage value represented by the current signal with a set threshold value, and when the voltage value represented by the current signal is greater than or equal to the threshold value, the signal amplification processing module amplifies the current signal and outputs it as a fault current signal.

[0006] Furthermore, the target device includes a first target device, and the fault current detection device also includes: a microcontroller, a first relay and a first relay control module, the first relay is used to couple to the first power supply branch between the target circuit and the first target device, the signal amplification and processing module is coupled to the microcontroller, and the microcontroller is coupled to the first relay control module; the microcontroller is used to trigger the first relay control module to drive the first relay to disconnect the first power supply branch when receiving the fault current signal output by the signal amplification and processing module.

[0007] Furthermore, the fault current detection device also includes a first fuse, and the first fuse is used to be coupled to the first power supply branch between the first relay and the first target device, and the first fuse is used to protect the first target device.

[0008] Furthermore, the target device includes a second target device, and the fault current detection device also includes: a second relay and a second relay control module, the second relay is used to couple to the second power supply branch between the target circuit and the second target device, the signal amplification and processing module is coupled to the microcontroller, and the microcontroller is coupled to the second relay control module; the microcontroller is used to trigger the second relay control module to drive the second relay to disconnect the second power supply branch when receiving the fault current signal output by the signal amplification and processing module.

[0009] Furthermore, the fault current detection device also includes a second fuse, and the second fuse is used to be coupled to the second power supply branch between the second relay and the second target device, and the second fuse is used to protect the second target device.

[0010] Furthermore, the power supply module includes: a rectifier bridge stack, a first resistor, a second resistor, a voltage regulator diode, a field effect transistor, a first capacitor and a low voltage difference linear regulator; the first output end of the rectifier bridge stack is connected in series to one end of the first resistor, and the second output end of the rectifier bridge stack is configured as a ground end; one end of the second resistor is connected to one end of the first resistor, and the other end of the second resistor is connected to the output end of the voltage regulator diode; the input end of the voltage regulator diode is configured as a ground end; the drain of the field effect transistor is connected to the other end of the first resistor, the source of the field effect transistor is connected to the input end of the low voltage difference linear regulator, and the gate of the field effect transistor is connected to the output end of the voltage regulator diode; one end of the first capacitor is connected to the input end of the low voltage difference linear regulator, and the other end of the first capacitor is configured as a ground end; the output end of the low voltage difference linear regulator is coupled to the Hall current detection module, and the low voltage difference linear regulator is also configured with a ground end.

[0011] Furthermore, the signal amplification processing module includes: a second capacitor, a third resistor, a fourth resistor, a fifth resistor, a first diode and an operational amplifier; one end of the second capacitor is connected to the output end of the low voltage difference linear regulator, and the other end of the second capacitor is configured as a ground end; one end of the third resistor is connected to the output end of the low voltage difference linear regulator, and the other end of the third resistor is connected to the positive input end of the operational amplifier; one end of the fourth resistor is connected to the positive input end of the operational amplifier, and the other end of the fourth resistor is configured as a ground end; the input end of the first diode is connected to the positive input end of the operational amplifier, and the output end of the first diode is connected to the output end of the operational amplifier; one end of the fifth resistor is connected to the output end of the low voltage difference linear regulator, and the other end of the fifth resistor is connected to the output end of the operational amplifier.

[0012] Furthermore, the first relay control module includes: a first transistor, a third diode, a sixth resistor and a seventh resistor, one end of the sixth resistor is connected to the base of the first transistor, and the other end of the sixth resistor is connected to the microcontroller; one end of the seventh resistor is connected to the base of the first transistor, and the other end of the seventh resistor is configured as a ground terminal; the emitter of the first transistor is configured as a ground terminal, and the collector of the first transistor is connected to the input end of the third diode; the input end of the third diode is connected to the first relay, and the output end of the third diode is coupled to the first relay; the collector of the first transistor is coupled to the first relay.

[0013] Furthermore, the Hall current detection module includes: a first current input terminal, a second current input terminal, a first current output terminal, a second current output terminal, a power supply voltage terminal, a signal output terminal, a blank terminal and a ground terminal. The current signal flows through the first current input terminal, the second current input terminal, the first current output terminal and the second current output terminal to form a current path. The power supply voltage terminal, the signal output terminal, the blank terminal and the ground terminal form a Hall sensor circuit. The current path generates a current magnetic field for converting the voltage value represented by the current signal flowing through the Hall sensor circuit into a proportional voltage. The Hall current detection module sends the voltage to the signal amplification processing module.

[0014] In a second aspect, an embodiment of the present application provides a fault current detection method applied to an intelligent switch, which is applied to a fault current detection device, wherein the fault current detection device includes a power supply module, a Hall current detection module and a signal amplification processing module, wherein the power supply module is coupled to the Hall current detection module, and the Hall current detection module is coupled to the signal amplification processing module, and the method includes: the power supply module supplies power to the Hall current detection module; the Hall current detection module collects a current signal in a target circuit and sends the current signal to the signal amplification processing module, wherein the target circuit is used to power a target device; the signal amplification processing module compares a voltage value represented by the current signal with a set threshold value, and when the voltage value represented by the current signal is greater than or equal to the threshold value, the signal amplification processing module amplifies the current signal and outputs it as a fault current signal.

[0015] Compared with the prior art, the fault current detection device and method for intelligent switch provided by the present application, in the case where the fault current detection device includes a power supply module, a Hall current detection module and a signal amplification processing module, collects the current signal in the target circuit used to power the target device through the Hall current detection module, and sends the current signal to the signal amplification processing module, so that the signal amplification processing module compares the voltage value represented by the current signal with the set threshold value, and when the voltage value represented by the current signal is greater than or equal to the threshold value, the signal amplification processing module amplifies the current signal and outputs it as a fault current signal. Thus, by using the Hall current detection module instead of the fuse for fault current detection, the current signal detected by the Hall current detection module can be output as a fault current signal after being compared and processed and amplified by the signal amplification processing module, thereby realizing timely detection of the fault current.

[0016] These and other aspects of the present application will become more apparent from the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a schematic diagram of the fuse setting position in the prior art.

[0019] Figure 2 It is a circuit module diagram of a fault current detection device applied to an intelligent switch provided in an embodiment of the present application.

[0020] Figure 3 Schematic diagram of a circuit structure of a fault current detection device applied to an intelligent switch provided in an embodiment of the present application.

[0021] Figure 4 Schematic diagram of another circuit structure of a fault current detection device applied to an intelligent switch provided in an embodiment of the present application.

[0022] Figure 5 It is a method flow chart of a fault current detection method applied to an intelligent switch provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the embodiments of the present application, the embodiments of the present application will be described more comprehensively with reference to the relevant drawings below. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the examples of this application are only for the purpose of describing specific implementations and are not intended to limit this application.

[0025] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] like Figure 1 As shown, in the prior art, a fuse is usually set on the main circuit (such as Figure 1 The FS (FUSE) shown in the figure can limit the fault current when the circuit fails, thereby protecting the equipment. However, the fuse on the total circuit has a high melting point and a relatively large volume. For the traditional 86 bottom shell, for electronic products with limited volume, it is impossible to add a separate fuse to each current circuit for fault current limitation, which results in a lack of a separate fuse for fault current detection in the separate current circuit, and it is easy to fail to limit the fault current in time; and the current fault caused by a branch circuit cannot be detected in time, which will also affect the normal use of other branches.

[0027] Based on the above problems, the inventors conducted a series of studies on the existing fault current detection circuits and methods, discovered the difficulties in the current use of fault current detection, and comprehensively considered the needs of users in practical applications, and proposed a fault current detection device and method for smart switches in the embodiments of the present application.

[0028] The fault current detection device and method for an intelligent switch provided in the embodiments of the present application will be described in detail below through specific embodiments.

[0029] See also Figure 2 , Figure 2 The circuit module diagram of the fault current detection device 10 applied to the intelligent switch provided in the embodiment of the present application. The fault current detection device 10 includes a power supply module 11, a Hall current detection module 12 and a signal amplification processing module 13, wherein the power supply module 11 is coupled to the Hall current detection module 12, and the Hall current detection module 12 is coupled to the signal amplification processing module 13.

[0030] The power supply module 11 is used to supply power to the Hall current detection module 12. The Hall current detection module 12 is used to collect the current signal in the target circuit and send the current signal to the signal amplification processing module 13. The target circuit is used to supply power to the target device. Figure 2 As shown in , the target circuit may be a current loop formed by power supply lines AC_N and AC_L. In some embodiments, the target circuit may be a power transmission line, etc., and different target circuits may have one or more input and output interfaces of the same or different forms to connect different terminal device target devices or power supply interfaces of the power supply module 11. Optionally, the target device may be any load device connected to the total loop, and the load device includes but is not limited to intelligent switches, sockets, strips, etc., which are not listed one by one here and are not intended to be limiting.

[0031] Furthermore, the signal amplification processing module 13 is used to compare the voltage value represented by the current signal with a set threshold value. When the voltage value represented by the current signal is greater than or equal to the threshold value, the signal amplification processing module 13 amplifies the current signal and outputs it as a fault current signal.

[0032] The set threshold value can be adjusted through the circuit. Optionally, the set rule can be: adjust the circuit design so that when the total current of the switch loop is greater than the maximum load current of the product, the circuit can output a fault signal in time, and the fault signal can be provided to the MCU (Micro controller Unit, also called microcontroller, such as Figure 3 The microcontroller 14 shown performs fault current processing.

[0033] For details, please refer to Figure 3 , is a circuit diagram of a fault current detection device for an intelligent switch provided in an embodiment of the present application. In order to ensure that the electrical characteristics of the product can be in an isolated state, the present application designs a power supply module 11 to supply power to a Hall current detection module 12 (which can also be understood as a Hall device). Figure 3 As shown, illustratively, the power supply module 11 may include: a rectifier bridge BD1, a first resistor R1, a second resistor R2, a voltage regulator diode D2, a field effect transistor Q2, a first capacitor C1 and a low voltage drop linear regulator U3.

[0034] Optionally, the first output terminal of the rectifier bridge stack BD1 (such as Figure 3 The pin 4 of BD1 shown in FIG. 1 is connected in series with one end of the first resistor R1, and the second output end of the rectifier bridge stack BD1 (such as Figure 3 Pin 3 of BD1 shown in FIG. 1 is configured as a ground terminal. One end of the second resistor R2 is electrically connected to one end of the first resistor R1, and the other end of the second resistor R2 is electrically connected to the output end of the voltage zener diode D2. The input end of the voltage zener diode D2 is configured as a ground terminal. The drain of the field effect transistor Q2 (as shown in FIG. Figure 3 The D electrode shown in FIG. 1 is electrically connected to the other end of the first resistor R1, and the source electrode of the field effect transistor Q2 (as shown in FIG. 1 ) is electrically connected to the other end of the first resistor R1. Figure 3 The S pole shown in FIG. 1 is electrically connected to the input terminal of the low voltage drop linear regulator U3, and the gate of the field effect transistor Q2 (as shown in FIG. Figure 3 The G pole shown in the figure is electrically connected to the output end of the voltage zener diode D2. One end of the first capacitor C1 is electrically connected to the input end of the low voltage drop linear regulator U3, and the other end of the first capacitor C1 is configured as a ground terminal. The output end of the low voltage drop linear regulator U3 is coupled to the Hall current detection module 12, and the low voltage drop linear regulator U3 is also configured with a ground terminal.

[0035] As an implementation method, an alternating current (AC) voltage passes through a rectifier bridge stack BD1 and is rectified into a DC voltage by the rectifier bridge stack BD1. When the DC voltage is lower than the breakdown voltage of the voltage stabilizing diode D2 (for example, the breakdown voltage here can be 12V, and the specific value is not limited), the MOS (i.e. Figure 3 The field effect transistor Q2 shown in the figure is in the on state and charges the capacitor C1 to 10V. In this case, the low voltage drop linear regulator U3 can step down the 10V voltage to 5V and provide it to the Hall current detection module 12. When the DC voltage is higher than the breakdown voltage of the Zener diode D2, the MOS is in the off state and the capacitor C1 is discharged.

[0036] Optionally, the model of the rectifier bridge stack BD1 in this embodiment may be MB10F-1000V, 1.2A, the model of the Zener diode D2 may be MM1Z18B, the model of the field effect transistor Q2 may be NCE3407A, and the model of the low voltage drop linear regulator U3 may be CJA1117B-5.

[0037] Further, such as Figure 3 As shown, the Hall current detection module 12 may include: a first current input terminal (pin IP+), a second current input terminal (pin IP+), a first current output terminal (pin IP-), a second current output terminal (pin IP-), a power supply voltage terminal (VCC), a signal output terminal (OUTP), a null terminal (OUTN) and a ground terminal (GND). The power supply voltage terminal (VCC) provides a 5V power supply for the Hall current detection module 12.

[0038] Specifically, the current signal flows through the first current input terminal (pin IP+), the second current input terminal (pin IP+), the first current output terminal (pin IP-) and the second current output terminal (pin IP-) to form a current path. The power supply voltage terminal (VCC), the signal output terminal (OUTP), the null terminal (OUTN) and the ground terminal (GND) form a Hall sensor circuit. The current path generates a current magnetic field, which is used to convert the voltage value represented by the current signal flowing through the Hall sensor circuit into a proportional voltage. The Hall current detection module 12 sends the voltage to the signal amplification processing module 13 for operational amplification processing, so that the fault current signal can reach the threshold value that triggers MCU14. At the same time, the amplification process can avoid the disadvantage that the weak signal is easily interfered, so that the fault signal can be discovered in time.

[0039] Optionally, in this embodiment, the model of the Hall device U4 in the Hall current detection module 12 may be ACS712.

[0040] For further information, please refer to Figure 3, the signal amplification processing module 13 may include: a second capacitor C2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first diode D1 and an operational amplifier U1-A. Among them, one end of the second capacitor C2 is electrically connected to the output end of the low voltage difference linear regulator U3, and the other end of the second capacitor C2 is configured as a ground terminal. One end of the third resistor R3 is electrically connected to the output end of the low voltage difference linear regulator U3, and the other end of the third resistor R3 is electrically connected to the positive input end of the operational amplifier U1-A. One end of the fourth resistor R4 is electrically connected to the positive input end of the operational amplifier U1-A, and the other end of the fourth resistor R4 is configured as a ground terminal. The input end of the first diode D1 is electrically connected to the positive input end of the operational amplifier U1-A, and the output end of the first diode D1 is electrically connected to the output end of the operational amplifier U1-A. One end of the fifth resistor R5 is electrically connected to the output end of the low voltage difference linear regulator U3, and the other end of the fifth resistor R5 is electrically connected to the output end of the operational amplifier U1-A.

[0041] Optionally, in this embodiment, the model of the operational amplifier U1 -A may be LMV7325, and the model of the first diode D1 may be 1N914.

[0042] As an implementation method, when the voltage represented by the current flowing through the Hall current detection module 12 reaches the threshold voltage of the operational amplifier U1-A, in order to enable the fault current signal to reach the threshold for triggering MCU14, the operational amplifier U1-A will amplify the voltage and then send it to MCU14.

[0043] Optionally, the target device may include a first target device, for example, the first target device may be an electronic switch product such as a lamp or a switch. Figure 2 As shown, the fault current detection device 10 may further include: a microcontroller (i.e. Figure 3 The first relay 16 is used to couple the first power supply branch (such as U2) between the target circuit and the first target device. Figure 2 The signal amplification processing module 13 is coupled to the microcontroller 14, and the microcontroller 14 is coupled to the first relay control module 15. The microcontroller 14 can be used to trigger the first relay control module 15 to drive the first relay 16 to disconnect the first power supply branch when receiving the fault current signal output by the signal amplification processing module 13, so as to protect the first target device connected to the first power supply branch. It is worth noting that in the case of multiple power supply branches, the corresponding relay control module can be triggered to drive the corresponding relay to disconnect the connected power supply branch.

[0044] Optionally, in this embodiment, U2 (i.e., MCU) can be integrated into a wireless communication module such as WIFI, Zigbee or BlE. In this way, in addition to controlling the wireless communication module to realize its own wireless communication function, U2 can also control the relay driving module to drive the relay to disconnect the power supply to the target device based on the fault signal output by the signal amplification processing module.

[0045] Further, such as Figure 2 As shown, the fault current detection device 10 may further include a first fuse 17. As a mode, the first fuse 17 may be used to couple the first power supply branch between the first relay 16 and the first target device, and the first fuse 17 is used to protect the first target device (which can be understood as Figure 2 The load 18 shown in the figure can be the first target device when there is only one power supply branch, and can be the first target device, the second target device, the third target device or more other target devices, etc. when there are multiple power supply branches).

[0046] Specifically, Figure 3 As shown, the first relay control module 15 may include: a first transistor Q1, a third diode D3, a sixth resistor R6 and a seventh resistor R7. Among them, one end of the sixth resistor R6 is electrically connected to the base of the first transistor Q1, and the other end of the sixth resistor R6 is electrically connected to the microcontroller (i.e., MCU) 14. One end of the seventh resistor R7 is electrically connected to the base of the first transistor Q1, and the other end of the seventh resistor R7 is configured as a ground terminal. The emitter of the first transistor Q1 is configured as a ground terminal, and the collector of the first transistor Q1 is electrically connected to the input end of the third diode D3. The input end of the third diode D3 is connected to the first relay ( Figure 3 The output end of the third diode D3 is coupled to the first relay 16. The collector of the first transistor Q1 is coupled to the first relay 16.

[0047] Optionally, in this embodiment, the model of the first transistor Q1 may be S8050, the model of the first relay K1 may be HRS3FTH Hongfa relay, and the model of the third diode D3 may be 1N4148.

[0048] As a method, in order to better detect the fault current of a separate current loop, and at the same time to avoid the fault current of a separate loop causing the main fuse to burn out, other current loops that have not failed cannot be used normally, the embodiments of the present application are as follows: Figure 3The first power supply branch AC_L1 is provided with a separate first fuse FS1 (it should be noted that since the fuse is provided in the first power supply branch AC_L1, it is named as the first fuse, and the specific naming rule is not limited). Optionally, the fuse FS1 is a slow-blow fuse, and its model may be an OC-932 series. When a fault current is generated, the first relay control module 15 controls the first relay 16 to cut off the first fuse 17 to protect the first target device.

[0049] It should be noted that the actual implementation may include multiple power supply branches. Figure 4 , is another circuit structure diagram of the fault current detection device applied to the intelligent switch provided in the embodiment of the present application. Figure 4 As shown, the second power supply branch 19 (ie Figure 4 AC_LX in, X=2, 3, 4, 5, 6...). Then it can be understood that if X=2, in one implementation, the target device in the embodiment of the present application may include a second target device. In this case, Figure 4 As shown, the fault current detection device 10 may further include: a second relay 192 (i.e. Figure 4 KX in, where X=2) and the second relay control module 191.

[0050] The second relay 192 is used to couple to the second power supply branch between the target circuit and the second target device. Similarly, in the circuit structure including the second power supply branch, the signal amplification processing module 13 is coupled to the microcontroller 14, and the microcontroller 14 is coupled to the second relay control module 191. The microcontroller 14 is used to trigger the second relay control module 191 to drive the second relay 192 to disconnect the second power supply branch when receiving the fault current signal output by the signal amplification processing module 13, so as to protect the second target device.

[0051] Furthermore, the fault current detection device 10 may also include a second fuse 193 (i.e., FSX in 4, where X=2), the second fuse 193 being used to couple in a second power supply branch between the second relay 192 and the second target device, and the second fuse 193 being used to protect the second target device.

[0052] It should be noted that Figure 4 Only two power supply branches are shown in the figure. In actual implementation, there may be more or fewer power supply branches. For example, different power supply branches can be obtained by taking different values ​​for X. These are not listed one by one here and are not intended to be limiting.

[0053] See also Figure 5 , Figure 5A method flow chart of a fault current detection method applied to an intelligent switch provided in an embodiment of the present application. The fault current detection method applied to an intelligent switch provided in an embodiment of the present application can be applied to the above-mentioned fault current detection device 10. The method includes:

[0054] Step S110 : the power supply module 11 supplies power to the Hall current detection module 12 .

[0055] Step S120: the Hall current detection module 12 collects the current signal in the target circuit and sends the current signal to the signal amplification processing module 13. The target circuit is used to power the target device.

[0056] Step S130: The signal amplification processing module 13 compares the voltage value represented by the current signal with the set threshold. When the voltage value represented by the current signal is greater than or equal to the set threshold, the signal amplification processing module 13 amplifies the current signal and outputs it as a fault current signal to protect the target device.

[0057] It can be understood that the features in the above-mentioned embodiments can be combined with each other to form new embodiments.

[0058] The fault current detection device and method for an intelligent switch provided in this embodiment adopts a Hall current detection module instead of a fuse to perform fault current detection, so that the current signal detected by the Hall current detection module can be output as a fault current signal after being compared and processed and amplified by a signal amplification processing module, thereby realizing timely detection of the fault current.

[0059] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A fault current detection device applied to an intelligent switch, characterized in that: include: A power supply module, a Hall current detection module and a signal amplification processing module, wherein the power supply module is coupled to the Hall current detection module, and the Hall current detection module is coupled to the signal amplification processing module, and the power supply module includes a voltage-stabilizing diode, a field effect transistor, and a first capacitor, wherein the input end of the voltage-stabilizing diode is configured as a ground end, the gate of the field effect transistor is electrically connected to the output end of the voltage-stabilizing diode, one end of the first capacitor is configured as a ground end, and the other end of the first capacitor is electrically connected to the source of the field effect transistor; The power supply module is used to supply power to the Hall current detection module. When the DC voltage is lower than the breakdown voltage of the Zener diode, the field effect transistor is in an on state and charges the first capacitor; when the DC voltage is higher than the breakdown voltage of the Zener diode, the field effect transistor is in an off state and the first capacitor is discharged; The Hall current detection module is used to collect the current signal in the target circuit and send the current signal to the signal amplification processing module. The target circuit is used to power the target device; The signal amplification processing module is used to compare the voltage value represented by the current signal with a set threshold value. When the voltage value represented by the current signal is greater than or equal to the threshold value, the signal amplification processing module amplifies the current signal and outputs it as a fault current signal.

2. The fault current detection device according to claim 1, characterized in that: The target device includes a first target device, and the fault current detection device further includes: a microcontroller, a first relay and a first relay control module, the first relay is used to couple to a first power supply branch between the target circuit and the first target device, the signal amplification processing module is coupled to the microcontroller, and the microcontroller is coupled to the first relay control module; The microcontroller is used to trigger the first relay control module to drive the first relay to disconnect the first power supply branch when receiving the fault current signal output by the signal amplification and processing module.

3. The fault current detection device according to claim 2, characterized in that: The fault current detection device further includes a first fuse, wherein the first fuse is used to be coupled to the first power supply branch between the first relay and the first target device, and the first fuse is used to protect the first target device.

4. The fault current detection device according to claim 2, characterized in that: The target device includes a second target device, and the fault current detection device further includes: a second relay and a second relay control module, the second relay is used to couple in a second power supply branch between the target circuit and the second target device, the signal amplification processing module is coupled with the microcontroller, and the microcontroller is coupled with the second relay control module; The microcontroller is used to trigger the second relay control module to drive the second relay to disconnect the second power supply branch when receiving the fault current signal output by the signal amplification and processing module.

5. The fault current detection device according to claim 4, characterized in that: The fault current detection device further includes a second fuse, wherein the second fuse is used to be coupled to the second power supply branch between the second relay and the second target device, and the second fuse is used to protect the second target device.

6. The fault current detection device according to claim 1, characterized in that: The power supply module includes: a rectifier bridge stack, a first resistor, a second resistor, a voltage regulator diode, a field effect transistor, a first capacitor and a low voltage difference linear regulator; the first output end of the rectifier bridge stack is connected in series with one end of the first resistor, and the second output end of the rectifier bridge stack is configured as a ground end; one end of the second resistor is connected to one end of the first resistor, and the other end of the second resistor is connected to the output end of the voltage regulator diode; the input end of the voltage regulator diode is configured as a ground end; the drain of the field effect transistor is connected to the other end of the first resistor, the source of the field effect transistor is connected to the input end of the low voltage difference linear regulator, and the gate of the field effect transistor is connected to the output end of the voltage regulator diode; one end of the first capacitor is connected to the input end of the low voltage difference linear regulator, and the other end of the first capacitor is configured as a ground end; the output end of the low voltage difference linear regulator is coupled to the Hall current detection module, and the low voltage difference linear regulator is also configured with a ground end.

7. The fault current detection device according to claim 6, characterized in that: The signal amplification processing module includes: a second capacitor, a third resistor, a fourth resistor, a fifth resistor, a first diode and an operational amplifier; one end of the second capacitor is connected to the output end of the low voltage difference linear regulator, and the other end of the second capacitor is configured as a ground end; one end of the third resistor is connected to the output end of the low voltage difference linear regulator, and the other end of the third resistor is connected to the positive input end of the operational amplifier; one end of the fourth resistor is connected to the positive input end of the operational amplifier, and the other end of the fourth resistor is configured as a ground end; the input end of the first diode is connected to the positive input end of the operational amplifier, and the output end of the first diode is connected to the output end of the operational amplifier; one end of the fifth resistor is connected to the output end of the low voltage difference linear regulator, and the other end of the fifth resistor is connected to the output end of the operational amplifier.

8. The fault current detection device according to claim 2, characterized in that: The first relay control module includes: a first transistor, a third diode, a sixth resistor and a seventh resistor, one end of the sixth resistor is connected to the base of the first transistor, and the other end of the sixth resistor is connected to the microcontroller; one end of the seventh resistor is connected to the base of the first transistor, and the other end of the seventh resistor is configured as a ground terminal; the emitter of the first transistor is configured as a ground terminal, and the collector of the first transistor is connected to the input end of the third diode; the input end of the third diode is connected to the first relay, and the output end of the third diode is coupled to the first relay; the collector of the first transistor is coupled to the first relay.

9. The fault current detection device according to claim 1, characterized in that: The Hall current detection module includes: a first current input terminal, a second current input terminal, a first current output terminal, a second current output terminal, a power supply voltage terminal, a signal output terminal, a blank terminal and a ground terminal. The current signal flows through the first current input terminal, the second current input terminal, the first current output terminal and the second current output terminal to form a current path. The power supply voltage terminal, the signal output terminal, the blank terminal and the ground terminal form a Hall sensor circuit. The current path generates a current magnetic field for converting the voltage value represented by the current signal flowing through the Hall sensor circuit into a proportional voltage. The Hall current detection module sends the voltage to the signal amplification processing module.

10. A fault current detection method applied to an intelligent switch, applied to a fault current detection device, the fault current detection device comprising a power supply module, a Hall current detection module and a signal amplification processing module, the power supply module is coupled with the Hall current detection module, the Hall current detection module is coupled with the signal amplification processing module, the power supply module comprises a voltage regulator diode, a field effect transistor, and a first capacitor, wherein: The input end of the voltage-stabilizing diode is configured as a ground end, the gate of the field-effect transistor is electrically connected to the output end of the voltage-stabilizing diode, one end of the first capacitor is configured as a ground end, and the other end of the first capacitor is electrically connected to the source of the field-effect transistor, wherein the method comprises: The power supply module supplies power to the Hall current detection module, when the DC voltage is lower than the breakdown voltage of the Zener diode, the field effect transistor is in an on state and charges the first capacitor; when the DC voltage is higher than the breakdown voltage of the Zener diode, the field effect transistor is in an off state and the first capacitor is discharged; The Hall current detection module collects a current signal in a target circuit and sends the current signal to the signal amplification processing module, wherein the target circuit is used to power a target device; The signal amplification processing module compares the voltage value represented by the current signal with a set threshold value. When the voltage value represented by the current signal is greater than or equal to the threshold value, the signal amplification processing module amplifies the current signal and outputs it as a fault current signal.

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