CN210923818U - Fault current detection device applied to intelligent switch - Google Patents

Abstract

The application discloses a fault current detection device applied to an intelligent switch, which comprises a power supply module, a Hall current detection module and a signal amplification processing module, wherein the power supply module is used for supplying power to the Hall current detection module; the method comprises the steps that a current signal in a target circuit is collected through a Hall current detection module and sent to a signal amplification processing module, and the target circuit is used for supplying power to target equipment; the signal amplification processing module compares the 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 the amplified current signal as a fault current signal. The Hall current detection module is adopted to replace a fuse to detect fault current, so that current signals detected by the Hall current detection module can be output as fault current signals after being compared and processed and amplified by the signal amplification processing module, and timely fault current detection is realized.

Description

Fault current detection device applied to intelligent switch

Technical Field

The present application relates to the field of electronic technology, and more particularly, to a fault current detection device applied to an intelligent switch.

Background

The electronic switch product uses the fuse as the fault current detection of the main loop at present, because the fuse is required to have high breaking capacity of 1500A in safety regulation, the volume of the fuse is very large, and the upper limit of the fuse current of the main loop is higher, so the situation that the fault current cannot be limited in time is easy to occur. In addition, after the total fuse is blown down due to the fault current of the single loop, other current loops which are not in fault cannot be normally used.

SUMMERY OF THE UTILITY MODEL

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

The present application achieves the above object by the following technical solutions.

In a first aspect, an embodiment of the present application provides a fault current detection device applied to an intelligent switch, including: the Hall current detection device comprises a power supply module, a Hall current detection module and a signal amplification processing module, wherein the power supply module is coupled with the Hall current detection module, and the Hall current detection module is coupled with the signal amplification processing module; the power supply module is used for supplying power to the Hall current detection module; the Hall current detection module is used for collecting a current signal in a target circuit and sending the current signal to the signal amplification processing module, and the target circuit is used for supplying power to target equipment; the signal amplification processing module is used for comparing the 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 the amplified current signal as a fault current signal.

Further, the target device includes a first target device, and the fault current detection apparatus further includes: the first relay is used for being coupled in a first power supply branch circuit between the target circuit and the first target device, the signal amplification processing module is coupled with the microcontroller, and the microcontroller is coupled with the first relay control module; and the microcontroller is used for triggering the first relay control module to drive the first relay to disconnect the first power supply branch circuit when receiving the fault current signal output by the signal amplification processing module.

Further, the fault current detection apparatus further includes a first fuse, which is configured to be coupled in the first power supply branch between the first relay and the first target device, and configured to protect the first target device.

Further, the target device includes a second target device, and the fault current detection apparatus further includes: the second relay is used for being coupled in a second power supply branch circuit 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; and the microcontroller is used for triggering the second relay control module to drive the second relay to disconnect the second power supply branch circuit when receiving the fault current signal output by the signal amplification processing module.

Further, the fault current detection apparatus further includes a second fuse, the second fuse being configured to be coupled in the second power supply branch between the second relay and the second target device, and the second fuse being configured to protect the second target device.

Further, the power supply module includes: the rectifier bridge stack, the first resistor, the second resistor, the voltage stabilizing diode, the field effect transistor, the first capacitor and the low dropout regulator; a first output end of the rectifier bridge stack is connected in series with one end of the first resistor, and a second output end of the rectifier bridge stack is configured as a ground end; one end of the second resistor is connected with one end of the first resistor, and the other end of the second resistor is connected with the output end of the voltage stabilizing diode; the input end of the voltage stabilizing diode is configured as a grounding end; the drain electrode of the field effect transistor is connected with the other end of the first resistor, the source electrode of the field effect transistor is connected with the input end of the low dropout linear regulator, and the grid electrode of the field effect transistor is connected with the output end of the voltage stabilizing diode; one end of the first capacitor is connected with the input end of the low dropout regulator, and the other end of the first capacitor is configured as a ground end; the output end of the low dropout linear regulator is coupled with the Hall current detection module, and the low dropout linear regulator is also provided with a grounding end.

Further, the signal amplification processing module includes: the circuit comprises 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 with the output end of the low dropout regulator, and the other end of the second capacitor is configured as a grounding end; one end of the third resistor is connected with the output end of the low dropout linear regulator, and the other end of the third resistor is connected with the positive input end of the operational amplifier; one end of the fourth resistor is connected with 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 with the positive input end of the operational amplifier, and the output end of the first diode is connected with the output end of the operational amplifier; one end of the fifth resistor is connected with the output end of the low dropout linear regulator, and the other end of the fifth resistor is connected with the output end of the operational amplifier.

Further, the first relay control module includes: the circuit comprises a first triode, a third diode, a sixth resistor and a seventh resistor, wherein one end of the sixth resistor is connected with the base electrode of the first triode, and the other end of the sixth resistor is connected with the microcontroller; one end of the seventh resistor is connected with the base electrode of the first triode, and the other end of the seventh resistor is configured as a ground end; an emitter of the first triode is configured to be a ground terminal, and a collector of the first triode is connected with an input end of the third diode; the input end of the third diode is connected with the first relay, and the output end of the third diode is coupled with the first relay; the collector of the first triode is coupled with the first relay.

Further, the hall current detection module includes: first current input end, second current input end, first current output end, second current output end, mains voltage end, signal output end, put dead end and earthing terminal, current signal flows through first current input end, second current input end first current output end and second current output end forms the current route, mains voltage end signal output end put dead end and earthing terminal form hall sensor circuit, the current route produces the electric current magnetic field, is used for flowing through hall sensor circuit the voltage value that current signal characterized changes into the voltage of proportion, hall current detection module will the voltage sends for signal amplification processing module.

Further, the hall current detection module is of an ACS 712.

Compared with the prior art, the fault current detection device applied to the intelligent switch provided by the application comprises a power supply module, a Hall current detection module and a signal amplification processing module, the Hall current detection module collects current signals in a target circuit for supplying power to target equipment, and sends the current signals to the signal amplification processing module, so that the signal amplification processing module compares the voltage value represented by the current signals with the set threshold value, and when the voltage value represented by the current signals is larger than or equal to the threshold value, the signal amplification processing module outputs the amplified current signals as fault current signals. Therefore, the Hall current detection module is adopted to replace a fuse to detect the fault current, 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 the signal amplification processing module, the fault current can be detected timely, and the problem that the fault cannot be detected timely due to the fact that the branch current is too small can be solved.

These and other aspects of the present application will be more readily apparent from the following description of the embodiments.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic diagram of a fuse setting position in the prior art.

Fig. 2 is a circuit block diagram of a fault current detection device applied to an intelligent switch according to an embodiment of the present application.

Fig. 3 is a schematic circuit diagram of a fault current detection device applied to an intelligent switch according to an embodiment of the present application.

Fig. 4 is a schematic circuit diagram of another circuit structure of the fault current detection device applied to the intelligent switch according to the embodiment of the present application.

Detailed Description

To facilitate an understanding of the embodiments of the present application, the embodiments of the present application will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the examples of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

As shown in fig. 1, in the prior art, a FUSE (FS (FUSE, FUSE) shown in fig. 1) is usually disposed on a main loop to limit a fault current when a circuit fails, so as to protect equipment. However, the fuse on the main loop has a high melting point and a relatively large volume, and for the conventional 86 bottom case, for the electronic product with limited volume, an individual fuse cannot be added in each current loop for fault current limitation, so that the individual current loop lacks an individual fuse for fault current detection, and the situation that the fault current cannot be limited in time is easy to occur; and the condition that a certain branch circuit causes current fault cannot be detected in time, and the normal use of other branch circuits can be influenced.

Based on the above problems, the inventor has conducted a series of studies on the existing fault current detection circuit and method, finds the difficulty in the use of the existing fault current detection, and comprehensively considers the requirements of users in practical application, and proposes the fault current detection device applied to the intelligent switch in the embodiment of the present application.

The fault current detection device applied to the intelligent switch provided by the embodiment of the present application will be described in detail through specific embodiments.

Referring to fig. 2, fig. 2 is a circuit block diagram of a fault current detection device 10 applied to an intelligent switch according to an embodiment of the present disclosure. 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, where 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.

The power supply module 11 is configured to supply power to the hall current detection module 12. And the hall current detection module 12 is configured to collect a current signal in a target circuit, and send the current signal to the signal amplification processing module 13, where the target circuit is configured to supply power to a target device. Alternatively, as shown in fig. 2, the target circuit may be a current loop constituted by the power supply lines AC _ N and AC _ L. In some embodiments, the target circuit may be a power 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 interfaces of the power supply module 11. Alternatively, the target device may be any load device connected to the main loop, where the load device includes, but is not limited to, a smart switch, a socket, a patch cord, and the like, which are not limited to the above.

Further, the signal amplification processing module 13 is configured to compare a voltage value represented by the current signal with a set threshold, and when the voltage value represented by the current signal is greater than or equal to the threshold, the signal amplification processing module 13 amplifies the current signal and outputs the amplified current signal as a fault current signal.

The set threshold may be adjusted by a circuit, and optionally, the set rule may be: the design of the circuit is adjusted 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 an MCU (Micro controller Unit, a Micro control Unit, also called a microcontroller, such as the microcontroller 14 shown in fig. 3) for fault current processing.

Specifically, please refer to fig. 3, which is a schematic circuit structure diagram of the fault current detection apparatus applied to the intelligent switch according to the embodiment of the present disclosure. In order to ensure that the electrical characteristics of the product can be in an isolated state, the power supply module 11 is designed to supply power to the hall current detection module 12 (which can also be understood as a hall device). As shown in fig. 3, for example, the power supply module 11 may include: the low dropout regulator comprises a rectifier bridge stack 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 dropout regulator U3.

Optionally, a first output terminal (pin 4 of BD1 shown in fig. 3) of the rectifier bridge stack BD1 is connected in series to one end of the first resistor R1, and a second output terminal (pin 3 of BD1 shown in fig. 3) of the rectifier bridge stack BD1 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 zener diode D2. The input terminal of the zener diode D2 is configured as a ground terminal. The drain (D pole shown in fig. 3) of the field effect transistor Q2 is electrically connected to the other end of the first resistor R1, the source (S pole shown in fig. 3) of the field effect transistor Q2 is electrically connected to the input terminal of the low dropout regulator U3, and the gate (G pole shown in fig. 3) of the field effect transistor Q2 is electrically connected to the output terminal of the zener diode D2. One end of the first capacitor C1 is electrically connected to the input terminal of the low dropout regulator U3, and the other end of the first capacitor C1 is configured as a ground terminal. The output end of the low dropout regulator U3 is coupled to the hall current detection module 12, and the low dropout regulator U3 is further configured with a ground end.

In one embodiment, an Alternating Current (AC) voltage passes through the bridge rectifier BD1 and is rectified into a dc voltage by the bridge rectifier BD1, and when the dc voltage is lower than the breakdown voltage of the zener diode D2 (for example, the breakdown voltage may be 12V, and the specific value is not limited), the MOS (i.e., the field effect transistor Q2 shown in fig. 3) is in a conducting state and charges the capacitor C1 to 10V, in which case the low dropout linear regulator U3 may step down the voltage of 10V to 5V and provide the voltage 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 discharges.

Optionally, the model of the bridge rectifier 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 dropout regulator U3 may be CJA 1117B-5.

Further, as shown in fig. 3, 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 voltage terminal (VCC), a signal output terminal (OUTP), a dead end terminal (OUTN), and a ground terminal (GND). Wherein, the power voltage terminal (VCC) provides a 5V power supply for the hall current detection module 12.

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 idle terminal (OUTN), and the ground terminal (GND) form a hall sensor circuit. The current path generates a current magnetic field for converting a voltage value represented by a 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 operation amplification processing, so that a fault current signal can reach a threshold value for triggering the MCU14, and the amplification processing can avoid the disadvantage that a weak signal is easily interfered, so that the fault signal can be found in time.

Optionally, in this embodiment, the model of the hall device U4 in the hall current detection module 12 may be the ACS 712.

Further, referring to fig. 3 again, 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. One end of the second capacitor C2 is electrically connected to the output terminal of the low dropout 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 terminal of the low dropout regulator U3, and the other end of the third resistor R3 is electrically connected to the positive input terminal of the operational amplifier U1-a. One end of the fourth resistor R4 is electrically connected to the positive input terminal of the operational amplifier U1-a, and the other end of the fourth resistor R4 is configured as a ground terminal. The input terminal of the first diode D1 is electrically connected to the positive input terminal of the operational amplifier U1-A, and the output terminal of the first diode D1 is electrically connected to the output terminal of the operational amplifier U1-A. One end of the fifth resistor R5 is electrically connected to the output terminal of the low dropout regulator U3, and the other end of the fifth resistor R5 is electrically connected to the output terminal of the operational amplifier U1-a.

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 1N 914.

In one embodiment, 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, the operational amplifier U1-a amplifies the voltage and sends it to the MCU14 in order to enable the fault current signal to reach the threshold value of the triggering MCU 14.

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. As one mode, as shown in fig. 2, the fault current detection device 10 may further include: a microcontroller (i.e., U2 shown in fig. 3) 14, a first relay 16, and a first relay control module 15. Wherein the first relay 16 is configured to be coupled in a first power supply branch (such as the power supply branch AC _ L1 shown in fig. 2) between the target circuit and the first target device. 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 may be configured 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 noted that, in the case of multiple power supply branches, the corresponding relay control module may be triggered to drive the corresponding relay to disconnect the connected power supply branch.

Optionally, in this embodiment, the U2 (i.e., the MCU) may be integrated into a wireless communication module such as WIFI, Zigbee or BIE. In this way, in addition to controlling the wireless communication module to realize the wireless communication function of itself, U2 may also control the relay driving module to drive the relay to cut off the power supply to the target device based on the fault signal output by the signal amplification processing module.

Further, as shown in fig. 2, the fault current detection device 10 may further include a first fuse 17. As one approach, a first fuse 17 may be used in a first power supply branch coupled between the first relay 16 and a first target device, the first fuse 17 being used to protect the first target device (it may be understood that the load 18 as shown in fig. 2, in the case of only one power supply branch, the load 18 may be the first target device, and in the case of multiple power supply branches, the load 18 may be the first target device, a second target device, a third target device, or more other target devices, etc.).

Specifically, as shown in fig. 3, the first relay control module 15 may include: the circuit comprises a first triode Q1, a third diode D3, a sixth resistor R6 and a seventh resistor R7. 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., the 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 terminal of the third diode D3. An input end of the third diode D3 is electrically connected to the first relay (K1 in fig. 3) 16, and an 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.

Optionally, in this embodiment, the model of the first triode Q1 may be S8050, the model of the first relay K1 may be an HRS3FTH macro relay, and the model of the third diode D3 may be 1N 4148.

As a manner, in order to better perform fault current detection on the individual current loop, and meanwhile, in order to avoid that after the total fuse is blown down due to the fault current of the individual loop, other current loops which do not have faults cannot be normally used, in the embodiment of the present application, a single first fuse FS1 is provided on the first power supply branch AC _ L1 as shown in fig. 3 (it should be noted that, since the fuse is provided on the first power supply branch AC _ L1, the fuse is named as a first fuse, and specific naming rules are not limited), optionally, the fuse FS1 is a slow-break fuse, and the model of the fuse FS1 may be an OC-932 series. When a fault current is generated, the first target device can be protected by controlling the first relay 16 to cut off the first fuse 17 through the first relay control module 15.

It should be noted that, in practical implementation, a plurality of power supply branches may be included. Fig. 4 is a schematic circuit diagram of a fault current detection device applied to an intelligent switch according to an embodiment of the present disclosure. As shown in fig. 4, a second power supply branch 19 is shown (i.e., AC _ LX, X ═ 2, 3,4,5,6, in fig. 4). It is to be understood that if X is 2, in one embodiment, the target device in the embodiment of the present application may include a second target device. In this case, as shown in fig. 4, the fault current detection apparatus 10 may further include: a second relay 192 (i.e., KX in fig. 4, where X equals 2), and a second relay control module 191.

Wherein the second relay 192 is configured to be coupled to a second power supply branch between the target circuit and a second target device. Similarly, in the circuit configuration 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. And the microcontroller 14 is configured 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.

Further, the fault current detection apparatus 10 may further include a second fuse 193 (i.e., FSX as in fig. 4, where X is 2), the second fuse 193 being configured to be coupled in a second power supply branch between the second relay 192 and a second target device, and the second fuse 193 being configured to protect the second target device.

It should be noted that only two power supply branches are shown in fig. 4, and in practical implementation, more or fewer power supply branches may be used, for example, different power supply branches may be obtained by taking different values for X, which is not illustrated and not limited herein.

It will be appreciated that features from the above described embodiments may be combined with each other and form new embodiments.

The fault current detection device applied to the intelligent switch provided by the embodiment carries out fault current detection by adopting the Hall current detection module to replace a fuse, so that a 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 fault current and also avoiding the problem that the fault cannot be detected timely due to the fact that the branch current is too small.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A fault current detection device applied to an intelligent switch is characterized by comprising: the Hall current detection device comprises a power supply module, a Hall current detection module and a signal amplification processing module, wherein the power supply module is coupled with the Hall current detection module, and the Hall current detection module is coupled with the signal amplification processing module;

the power supply module is used for supplying power to the Hall current detection module;

the Hall current detection module is used for collecting a current signal in a target circuit and sending the current signal to the signal amplification processing module, and the target circuit is used for supplying power to target equipment;

the signal amplification processing module is used for comparing the 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 the amplified current signal as a fault current signal.

2. The fault current detection device according to claim 1, wherein the target apparatus includes a first target apparatus, the fault current detection device further comprising: the first relay is used for being coupled in a first power supply branch circuit between the target circuit and the first target device, the signal amplification processing module is coupled with the microcontroller, and the microcontroller is coupled with the first relay control module;

and the microcontroller is used for triggering the first relay control module to drive the first relay to disconnect the first power supply branch circuit when receiving the fault current signal output by the signal amplification processing module.

3. The fault current detection device according to claim 2, further comprising a first fuse for coupling in the first power supply branch between the first relay and the first target device, the first fuse for protecting the first target device.

4. The fault current detection device according to claim 2, wherein the target apparatus includes a second target apparatus, the fault current detection device further comprising: the second relay is used for being coupled in a second power supply branch circuit 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;

and the microcontroller is used for triggering the second relay control module to drive the second relay to disconnect the second power supply branch circuit when receiving the fault current signal output by the signal amplification processing module.

5. The fault current detection device according to claim 4, further comprising a second fuse for coupling in the second power supply branch between the second relay and the second target apparatus, the second fuse for protecting the second target apparatus.

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

7. The fault current detection device according to claim 6, wherein the signal amplification processing module includes: the circuit comprises 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 with the output end of the low dropout regulator, and the other end of the second capacitor is configured as a grounding end; one end of the third resistor is connected with the output end of the low dropout linear regulator, and the other end of the third resistor is connected with the positive input end of the operational amplifier; one end of the fourth resistor is connected with 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 with the positive input end of the operational amplifier, and the output end of the first diode is connected with the output end of the operational amplifier; one end of the fifth resistor is connected with the output end of the low dropout linear regulator, and the other end of the fifth resistor is connected with the output end of the operational amplifier.

8. The fault current detection device of claim 2, wherein the first relay control module comprises: the circuit comprises a first triode, a third diode, a sixth resistor and a seventh resistor, wherein one end of the sixth resistor is connected with the base electrode of the first triode, and the other end of the sixth resistor is connected with the microcontroller; one end of the seventh resistor is connected with the base electrode of the first triode, and the other end of the seventh resistor is configured as a ground end; an emitter of the first triode is configured to be a ground terminal, and a collector of the first triode is connected with an input end of the third diode; the input end of the third diode is connected with the first relay, and the output end of the third diode is coupled with the first relay; the collector of the first triode is coupled with the first relay.

9. The fault current detection device according to claim 1, wherein the hall current detection module comprises: first current input end, second current input end, first current output end, second current output end, mains voltage end, signal output end, put dead end and earthing terminal, current signal flows through first current input end, second current input end first current output end and second current output end forms the current route, mains voltage end signal output end put dead end and earthing terminal form hall sensor circuit, the current route produces the electric current magnetic field, is used for flowing through hall sensor circuit the voltage value that current signal characterized changes into the voltage of proportion, hall current detection module will the voltage sends for signal amplification processing module.

10. The device according to any one of claims 1 to 9, wherein the hall current detection module is of the type ACS 712.

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