Quick cut-off device for electric leakage fault

Abstract

The utility model relates to a quick cut-off device for electric leakage faults. The quick cut-off device comprises a main switch module, a leakage current detection module, an MCU (Microprogrammed Control Unit) control module and a quick switching module, the main switch module is arranged in a main loop to control the on and off of the main loop; the leakage current detection module is used for detecting leakage current in the main loop and generating a detection signal based on a detection result; the quick switching module controls the disconnection of the main switch module based on the detection signal and maintains the disconnection state; the MCU control module is used for sending a reset signal to control the rapid switching module to reset the main switch module; the quick switching module comprises a latch and a switch unit, and the latch controls the switch unit based on the detection signal or the reset signal so as to control the main switch module to be switched off or switched on. According to the utility model, rapid, timely and accurate electric leakage fault processing can be realized through a hardware circuit.

Description

Technical Field

[0001] The utility model relates to the field of leakage fault handling of energy storage systems, and more specifically, to a leakage fault rapid cut-off device. Background Art

[0002] With the popularization of electric vehicles and the increasing popularity of the green development of the carbon neutrality industry, charging piles and energy storage services have developed better, and their volumes are gradually moving towards miniaturization and household appliance trends. AC charging piles and small portable energy storage systems have gradually become important standby items in daily life. Therefore, the detection of leakage current parameters and whether the main circuit of the power supply system can be promptly disconnected within the time specified by relevant national standards to achieve safe use has become a top priority.

[0003] The leakage fault detection and cut-off in the prior art usually adopt the following scheme. First, a leakage current signal is collected based on the mutual inductance coil provided by the energy storage system manufacturer, a fault signal is obtained through a processing circuit, then the fault signal is detected, identified, and judged by software, and finally, the main power supply circuit is cut off through a control loop switch. However, limited by the MCU resources and the number of tasks that the terminal device needs to process and detect, it is impossible to ensure that the main power supply circuit is disconnected within the time specified by the national standard, thus causing danger. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a leakage fault rapid cut-off device that can quickly, timely, and accurately handle leakage faults through a hardware circuit. It can promptly disconnect the main circuit when a leakage fault occurs, thereby making the terminal device more stable and safe in view of the above-mentioned defects of the prior art.

[0005] The technical solution adopted by the utility model to solve its technical problems is to construct a leakage fault rapid cut-off device, including: a main switch module, a leakage current detection module, an MCU control module, and a fast switching module; the main switch module is arranged in the main circuit to control the conduction and cut-off of the main circuit; the leakage current detection module is used to detect the leakage current in the main circuit and generate a detection signal based on the detection result; the fast switching module controls the disconnection of the main switch module based on the detection signal and maintains the disconnected state; the MCU control module is used to send a reset signal to control the fast switching module to reset the main switch module;

[0006] The fast switching module includes a latch and a switch unit, and the latch controls the switch unit based on the detection signal or the reset signal; when the switch unit is turned on, it controls the main switch module to disconnect, and when the switch unit is turned off, it controls the main switch module to conduct.

[0007] In the leakage fault quick cut-off device of the present utility model, the main switch module includes a normally closed relay; the first end of the coil of the normally closed relay is connected to a first voltage, and the second end of the coil is connected to the quick switching module; the moving contact and the static contact of the normally closed relay are respectively connected to the main circuit to control the conduction and cut-off of the main circuit.

[0008] In the leakage fault quick cut-off device of the present utility model, the main switch module further includes an anti-reverse diode; the cathode of the anti-reverse diode is connected to the first voltage and the first end of the coil of the normally closed relay, and the anode is connected to the second end of the coil of the normally closed relay.

[0009] In the leakage fault quick cut-off device of the present utility model, the switch unit includes a first switch tube, a first resistor, and a second resistor;

[0010] The first end of the latch is connected to the second end of the first switch tube and the second end of the coil of the normally closed relay, the second end is grounded, the third end receives the detection signal, the fourth end is connected to the first end of the first switch tube through the first resistor, the fifth end is connected to the first voltage, and the sixth end receives the reset signal; the third end of the first switch tube is grounded; the second resistor is connected between the first end and the third end of the first switch tube.

[0011] In the leakage fault quick cut-off device of the present utility model, the model of the latch is SN74LVC1G373DBVR; when the first end of the latch receives a high level, the output level of the fourth end follows the input level state of the third end; when the first end of the latch receives a low level, the fourth end maintains the output level state of the previous time; when the sixth end of the latch receives a low level, the fourth end outputs a high level or a low level; when the sixth end of the latch receives a high level, the fourth end has no output.

[0012] In the leakage fault quick cut-off device of the present utility model, the switch unit includes a first switch tube, a first resistor, a second resistor, a second switch tube, a third resistor, and a fourth resistor;

[0013] The first end of the first switch tube is connected to the fourth end of the latch through the first resistor and grounded through the second resistor, the third end of the first switch tube is grounded, and the second end is connected to the first end of the second switch tube through the third resistor; the first end of the second switch tube is also connected to the third end of the second switch tube through the fourth resistor; the second end of the second switch tube is connected to the first voltage;

[0014] The first end of the latch is connected to the third end of the second switching transistor, the second end is grounded, the third end receives the detection signal, the fourth end is connected to the first end of the first switching transistor via the first resistor, the fifth end is connected to the first voltage, and the sixth end receives the reset signal.

[0015] In the leakage fault rapid cut-off device of the present utility model, the model of the latch is SN74LVC1G373DBVR; when the first end of the latch receives a high level, the output level of the fourth end follows the input level state of the third end; when the first end of the latch receives a low level, the fourth end maintains the output level state of the previous time; when the sixth end of the latch receives a low level, the fourth end outputs a high level or a low level; when the sixth end of the latch receives a high level, the fourth end has no output.

[0016] In the leakage fault rapid cut-off device of the present utility model, the first switching transistor and the second switching transistor are triodes; the first end of the switching transistor is the base of the triode, the second end is the collector of the triode, and the third end is the emitter of the triode.

[0017] In the leakage fault rapid cut-off device of the present utility model, the leakage current detection module includes a current transformer.

[0018] Implementing the leakage fault rapid cut-off device of the present utility model, by using a latch to control the switching of the switch unit, and then controlling the main switch module, it can realize rapid, timely and accurate leakage fault processing through a hardware circuit. When a leakage fault occurs, the main circuit is disconnected in time, so that the terminal device is more stable and safe. Description of the Drawings

[0019] The following will further illustrate the present utility model in conjunction with the drawings. In the drawings:

[0020] Figure 1 is the principle block diagram of the leakage fault rapid cut-off device of the present utility model;

[0021] Figure 2 is the circuit diagram of the first preferred embodiment of the main switch module and the rapid switching module of the leakage fault rapid cut-off device of the present utility model;

[0022] Figure 3 is the circuit diagram of the second preferred embodiment of the main switch module and the rapid switching module of the leakage fault rapid cut-off device of the present utility model;

[0023] Figure 4 is the output truth table of the latch of the rapid switching module of the leakage fault rapid cut-off device of the present utility model. Detailed Embodiments

[0024] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0025] The present utility model relates to a rapid leakage fault cut-off device, which includes a main switch module, a leakage current detection module, an MCU control module and a rapid switching module; the main switch module is arranged in the main circuit to control the conduction and cut-off of the main circuit; the leakage current detection module is used to detect the leakage current in the main circuit and generate a detection signal based on the detection result; the rapid switching module controls the disconnection of the main switch module based on the detection signal and maintains the disconnected state; the MCU control module is used to send a reset signal to control the rapid switching module to reset the main switch module; the rapid switching module includes a latch and a switch unit, and the latch controls the switch unit based on the detection signal or the reset signal; when the switch unit is turned on, it controls the main switch module to be turned off, and when the switch unit is turned off, it controls the main switch module to be turned on.

[0026] By using a latch to control the switching of the switch unit, and then controlling the main switch module, rapid, timely and accurate leakage fault handling can be achieved through a hardware circuit. Therefore, the problem that the power supply circuit cannot be cut off in time due to software control when a leakage current occurs is solved. By using the MCU control module to send a reset signal to control the rapid switching module to reset the main switch module, the problem that the MCU control module responds erratically when the leakage disappears after the device disconnects the main circuit during a leakage is solved. Therefore, when a leakage fault occurs, the present invention mainly relies on the hardware circuit to timely disconnect the main circuit, achieving the purpose of being timely, accurate and effective, improving the problem that software control is not timely and the power supply circuit cannot be effectively disconnected, and especially solving the technical problem of timeout design for software to handle leakage current faults due to limited MCU resources or overloaded tasks to be processed by the terminal device.

[0027] Figure 1 is the principle block diagram of the rapid leakage fault cut-off device of the present utility model. As Figure 1As shown, the rapid cut-off device for leakage faults of the present utility model includes a main switch module 100, a leakage current detection module 200, an MCU control module 300, and a rapid switching module 400. The main switch module 100 is arranged in the main circuit 10 of the energy storage system to control the conduction and cut-off of the main circuit 10. The leakage current detection module 200 is used to detect the leakage current in the main circuit 10 and generate a detection signal based on the detection result. For example, the leakage current detection module 200 can adopt any leakage current detection module, unit, or device known in the art, such as a current transformer, to detect the leakage current. For example, in a preferred embodiment of the present utility model, when the leakage current detection module 200 detects a leakage current, it generates a detection signal with a high level, and when no leakage current is detected, it generates a detection signal with a low level. For example, in a preferred embodiment of the present utility model, when the leakage current detection module 200 detects a leakage current, it generates a detection signal with a high level, and when no leakage current is detected, it does not generate a detection signal. Again, for example, in still another preferred embodiment of the present utility model, when the leakage current detection module 200 detects a leakage current, it generates a detection signal with a low level, and when no leakage current is detected, it generates a detection signal with a high level. Again, for example, in still another preferred embodiment of the present utility model, when the leakage current detection module 200 detects a leakage current, it generates a detection signal with a low level, and when no leakage current is detected, it does not generate a detection signal. These ways of generating detection signals all fall within the protection scope of the present utility model.

[0028] The rapid switching module 400 controls the disconnection of the main switch module 100 based on the detection signal and maintains the disconnected state. The MCU control module 300 is used to send a reset signal to control the rapid switching module 400 to reset the main switch module 100.

[0029] In a preferred embodiment of the present utility model, the rapid switching module 400 includes a latch 410 and a switch unit 420. The latch 410 controls the switch unit 420 based on the detection signal or the reset signal; when the switch unit 420 is turned on, it controls the disconnection of the main switch module 100, and when the switch unit 420 is turned off, it controls the conduction of the main switch module 100. For example, in a preferred embodiment of the present utility model, the main switch module 100 includes a normally closed relay; the first end of the coil of the normally closed relay is connected to a first voltage, and the second end of the coil is connected to the rapid switching module 400; the moving contact and the static contact of the normally closed relay are respectively connected to the main circuit 10 to control the conduction and cut-off of the main circuit 10. The latch 410 controls the disconnection of the normally closed relay based on the detection signal, thereby realizing the disconnection of the main circuit 10. The latch 410 can also control the closure of the normally closed relay based on the reset signal, thereby realizing the closure of the main circuit 10.

[0030] The MCU control module 300 can adopt any known MCU controller, which can process the leakage fault through any known method, such as alarming through an external alarm system, etc. After the leakage fault is processed, the MCU control module 300 can be used to send a reset signal to control the fast switching module 400 to reset the main switch module 100. For example, after the staff completes the repair, the MCU control module 300 can be notified that the fault has been processed by triggering a button. At this time, the MCU control module 300 is used to send a reset signal to control the fast switching module 400 to reset the main switch module 100. Of course, the MCU control module 300 can also run a built-in known program to process the leakage fault. Here, any fault processing processes and methods known in the art are applicable to the present invention. In order not to obscure the invention points of the present invention, they will not be elaborated here.

[0031] The present invention controls the switching of the switch unit through a latch, and then controls the main switch module, and can realize fast, timely and accurate leakage fault processing through a hardware circuit. Therefore, when a leakage current occurs, the problem that the power supply circuit cannot be cut off in time due to software control is solved. By using the MCU control module to send a reset signal to control the fast switching module to reset the main switch module, the problem that the MCU control module responds disorderly when the leakage disappears due to the disconnection of the main circuit of the device during the occurrence of leakage is solved. Therefore, when a leakage fault occurs, the present invention mainly relies on the hardware circuit to timely disconnect the main circuit, achieving the purpose of timely, accurate and effective, improving the problem that software control is not timely and the power supply circuit cannot be effectively disconnected, and especially solving the technical problem of timeout design of software for processing leakage current faults due to limited MCU resources or excessive tasks to be processed by the terminal device.

[0032] Figure 2 It is the circuit diagram of the first preferred embodiment of the main switch module and the fast switching module of the leakage fault fast cutting device of the present invention. As Figure 2 shown, the main switch module 100 includes a normally closed relay K1 and an anti-reverse diode D1. The first end of the coil of the normally closed relay K1 is connected to the voltage VCC, and the second end of the coil is connected to the fast switching module 400; the moving contact and the static contact of the normally closed relay K1 are respectively connected to the main circuit 10 to control the conduction and cut-off of the main circuit 10. The cathode of the anti-reverse diode D1 is connected to the voltage VCC and the first end of the coil of the normally closed relay K1, and the anode is connected to the second end of the coil of the normally closed relay K1. In a simplified embodiment of the present invention, the anti-reverse diode D1 can also be omitted.

[0033] The switch unit 420 includes a first switching transistor Q1, a resistor R1, and a resistor R2. The first terminal of the latch 410 is connected to the second terminal of the first switching transistor Q1 and the second terminal of the coil of the normally-closed relay K1, the second terminal is grounded, the third terminal receives the detection signal, the fourth terminal is connected to the first terminal of the first switching transistor Q1 via the resistor R1, the fifth terminal is connected to the voltage VCC, and the sixth terminal receives the reset signal; the third terminal of the first switching transistor Q1 is grounded; the resistor R2 is connected between the first terminal and the third terminal of the first switching transistor Q1. Here, the first switching transistor Q1 may be an NPN triode, and in this case, the first terminal of the first switching transistor Q1 is the base of the triode, the second terminal is the collector of the triode, and the third terminal is the emitter of the triode. Of course, in other preferred embodiments of the present invention, switching transistors such as MOS transistors and IGBT transistors may also be used.

[0034] The model of the latch 410 is SN74LVC1G373DBVR; when the first terminal of the latch 410 receives a high level, the output level of the fourth terminal follows the input level state of the third terminal; when the first terminal of the latch 410 receives a low level, the fourth terminal maintains the output level state of the previous time; when the sixth terminal of the latch 410 receives a low level, the fourth terminal outputs a high level or a low level; when the sixth terminal of the latch 410 receives a high level, the fourth terminal has no output.

[0035] As Figure 2 and 4 shown, the first terminal of the latch 410 is the input LE terminal, the third terminal is the input D terminal, the fourth terminal is the output Q terminal, and the sixth terminal is the input OE terminal. Figure 4 is the output truth table of the latch of the fast switching module of the leakage fault fast cut-off device of the present invention. When the input LE terminal receives a high level, the output Q terminal follows the level state of the input D terminal; when the input LE terminal receives a low level, the output Q terminal maintains the output level state of the previous time. When the input OE terminal receives a low level, the output terminal Q outputs a high / low level state; when the input OE terminal receives a high level, the output Q terminal presents a high impedance state, that is, no output.

[0036] Next, we combine Figure 2 and 4The principle of the present utility model is described as follows. The third terminal (i.e., input D terminal) of the latch 410 receives the detection signal. In this preferred embodiment, when the leakage current detection module 200 detects a leakage current, a high-level detection signal is generated, and when no leakage current is detected, a low-level detection signal is generated. That is, when no leakage current is detected, the input D terminal of the latch 410 receives a low level. At this time, the first terminal (i.e., input LE terminal) of the latch 410 is at a high level. Therefore, the fourth terminal (i.e., output Q terminal) of the latch 410 outputs a low level. The base of the first switching transistor Q1 receives a low-level signal, and the first switching transistor Q1 cannot conduct. Therefore, the normally closed relay K1 remains closed, and the main circuit remains conducting.

[0037] When a leakage current is detected, the leakage current detection module 200 generates a high-level detection signal. The input D terminal of the latch 410 receives a high level. At this time, the first terminal (i.e., input LE terminal) of the latch 410 is at a high level. Therefore, the fourth terminal (i.e., output Q terminal) of the latch 410 outputs a high level. The base of the first switching transistor Q1 receives a high-level signal, and the first switching transistor Q1 conducts. Therefore, the normally closed relay K1 is controlled to disconnect, and the main circuit 10 is disconnected. Since the first switching transistor Q1 conducts, at this time, the first terminal (i.e., input LE terminal) of the latch 410 becomes a low level. Therefore, the fourth terminal (i.e., output Q terminal) of the latch 410 outputs and maintains the state of the previous output, that is, maintains at a high level. Therefore, the main circuit 10 can remain disconnected.

[0038] When the MCU control module 300 detects that the fourth terminal (i.e., output Q terminal) of the latch 410 outputs a high level, it can process relevant leakage faults. For example, it runs a built-in known program to handle leakage faults and notifies the staff to handle them through an alarm device, etc. After the leakage fault is processed, the MCU control module 300 outputs a high level to the sixth terminal (i.e., input OE terminal) of the latch 410. At this time, the fourth terminal (i.e., output Q terminal) of the latch 410 becomes a high-impedance state and cannot output a high level. At this time, the first terminal (i.e., input LE terminal) of the latch 410 returns to a high-level state, and the fourth terminal (i.e., output Q terminal) of the latch 410 follows the level change of the third terminal (i.e., input D terminal) of the latch 410 again.

[0039] Of course, those skilled in the art know that when the high and low levels of the detection signal are set differently, the high and low level states of the latch 410 can be correspondingly set to control the switching. Based on the teachings of the present utility model, those skilled in the art can implement various detection signals and the corresponding high and low level latch states of the latch. These all fall within the protection scope of the present utility model.

[0040] The leakage fault rapid cut-off device of the present utility model can achieve the hardware control to cut off the main circuit under the leakage fault without the participation of software control. For emergencies, it can achieve instant and rapid fault handling. Therefore, when a leakage fault occurs, it can timely disconnect the main circuit, making the terminal device more stable and safe. The leakage fault rapid cut-off device of the present utility model improves the processing speed of the leakage current fault and shortens the system fault response time. It is implemented by a complete hardware circuit, meeting the fault processing speed when the MCU resources are limited or the terminal device has a heavy task. It can also solve the problem that when the device disconnects the main circuit during the occurrence of leakage, the leakage disappears and the MCU control module response is disordered.

[0041] Figure 3 It is the circuit diagram of the second preferred embodiment of the main switch module and the fast switching module of the leakage fault rapid cut-off device of the present utility model. This preferred embodiment is applicable to the situation where the relay coil voltage of the normally closed relay K1 is higher than the voltage VCC, such as 5V. This is because if the voltage is too high, it will affect the operation of the latch 410. When the relay coil voltage of the normally closed relay K1 is equal to the voltage VCC, such as 5V, the circuit shown in Figure 2 can be adopted.

[0042] As Figure 3 shown, the switch unit 420 includes a first switch tube Q1, a resistor R1, a resistor R2, a second switch tube Q2, a resistor R3, and a resistor R4. The first end of the first switch tube Q1 is connected to the fourth end of the latch 410 through the resistor R1 and grounded through the resistor R2. The third end of the first switch tube Q1 is grounded, and the second end is connected to the first end of the second switch tube Q2 through the resistor R3. The first end of the second switch tube Q2 is simultaneously connected to the third end of the second switch tube Q2 through the resistor R4. The second end of the second switch tube Q2 is connected to the voltage VCC. The first end of the latch 410 is connected to the third end of the second switch tube Q2, the second end is grounded, the third end receives the detection signal, the fourth end is connected to the first end of the first switch tube Q1 through the resistor R1, the fifth end is connected to the voltage VCC, and the sixth end receives the reset signal. Here, the first switch tube Q1 and the second switch tube Q2 can be NPN triodes. At this time, the first ends of the first switch tube Q1 and the second switch tube Q2 are the bases of the triodes, the second ends are the collectors of the triodes, and the third ends are the emitters of the triodes. Of course, in other preferred embodiments of the present utility model, MOS tubes, IGBT tubes, and other switch tubes can also be adopted.

[0043] The model of the latch 410 is SN74LVC1G373DBVR; when the first end of the latch 410 receives a high level, the output level of the fourth end follows the input level state of the third end; when the first end of the latch 410 receives a low level, the fourth end maintains the output level state of the previous time; when the sixth end of the latch 410 receives a low level, the fourth end outputs a high level or a low level; when the sixth end of the latch 410 receives a high level, the fourth end has no output.

[0044] As Figure 3 and 4 shown, the first end of the latch 410 is the input LE end, the third end is the input D end, the fourth end is the output Q end, and the sixth end is the input OE end. Figure 4 is the output truth table of the latch 410 of the fast switching module of the leakage fault fast cut-off device of the present invention. When the input LE end receives a high level, the output Q end follows the level state of the input D end; when the input LE end receives a low level, the output Q end maintains the output level state of the previous time. When the input OE end receives a low level, the output end Q outputs a high / low level state; when the input OE end receives a high level, the output Q end presents a high impedance state, that is, there is no output.

[0045] Next, we will combine Figure 3 and 4 to illustrate the principle of the present invention as follows. The third end (i.e., the input D end) of the latch 410 receives the detection signal. The first end (i.e., the input LE end) of the latch 410 is connected to the third end of the second switching transistor Q2. The fourth end (i.e., the output Q end) of the latch 410 is connected to the base of the first switching transistor Q1.

[0046] In this preferred embodiment, when the leakage current detection module 200 detects a leakage current, it generates a high-level detection signal, and when no leakage current is detected, it generates a low-level detection signal. That is, when no leakage current is detected, the input D end of the latch 410 receives a low level. At this time, the first end (i.e., the input LE end) of the latch 410 is at a high level. Therefore, the fourth end (i.e., the output Q end) of the latch 410 outputs a low level. The base of the first switching transistor Q1 receives a low-level signal, and the first switching transistor Q1 cannot conduct. Therefore, the normally closed relay K1 remains closed, and the main circuit remains conducting.

[0047] When a leakage current is detected, the leakage current detection module 200 generates a detection signal at a high level. The input D terminal of the latch 410 receives a high level. At this time, the first terminal (i.e., the input LE terminal) of the latch 410 is at a high level. Therefore, the fourth terminal (i.e., the output Q terminal) of the latch 410 outputs a high level. The base of the first switching transistor Q1 receives a high-level signal, and the first switching transistor Q1 conducts. Therefore, the normally closed relay K1 is controlled to disconnect, and the main circuit 10 is disconnected. Since the first switching transistor Q1 conducts, at this time, the first terminal (i.e., the input LE terminal) of the latch 410 becomes a low level. Therefore, the fourth terminal (i.e., the output Q terminal) of the latch 410 outputs and maintains the state of the previous output, that is, maintains at a high level. Therefore, the main circuit 10 can remain disconnected.

[0048] When the MCU control module 300 detects that the fourth terminal (i.e., the output Q terminal) of the latch 410 outputs a high level, it can process relevant leakage faults. For example, it runs a built-in known program to handle the leakage fault and notifies the staff to handle it through an alarm device, etc. After the leakage fault is processed, the MCU control module 300 outputs a high level to the sixth terminal (i.e., the input OE terminal) of the latch 410. At this time, the fourth terminal (i.e., the output Q terminal) of the latch 410 becomes a high-impedance state and cannot output a high level. At this time, the first terminal (i.e., the input LE terminal) of the latch 410 returns to a high-level state, and the fourth terminal (i.e., the output Q terminal) of the latch 410 follows the level change of the third terminal (i.e., the input D terminal) of the latch 410 again.

[0049] The leakage fault rapid cut-off device of the present invention can achieve hardware control to cut off the main circuit under leakage faults without software participation in control. For emergencies, it can achieve immediate and rapid fault handling. Therefore, it can meet the requirement of timely disconnecting the main circuit when a leakage fault occurs, making the terminal device more stable and safe. The leakage fault rapid cut-off device of the present invention improves the processing speed of leakage current faults and shortens the system fault response time. It is implemented by a complete hardware circuit, which meets the fault processing speed when the MCU resources are limited or the terminal device tasks are heavy. It can also solve the problem that when the device disconnects the main circuit due to leakage and the leakage disappears, the MCU control module responds disorderly.

[0050] Although the present invention is described through specific embodiments, those skilled in the art should understand that without departing from the scope of the present invention, various transformations and equivalent substitutions can be made to the present invention. In addition, for specific situations or materials, various modifications can be made to the present invention without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed, but should include all implementation manners falling within the scope of the claims of the present invention.

[0051] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A leakage fault rapid disconnection device, characterized in that: include: A main switch module, a leakage current detection module, an MCU control module and a fast switching module; the main switch module is arranged in the main circuit to control the on and off of the main circuit; The leakage current detection module is used to detect the leakage current in the main circuit and generate a detection signal based on the detection result; the fast switching module controls the disconnection of the main switch module based on the detection signal and maintains the disconnection state; The MCU control module is used to send a reset signal to control the fast switching module to reset the main switch module; The fast switching module includes a latch and a switch unit, wherein the latch controls the switch unit based on the detection signal or the reset signal; when the switch unit is turned on, the main switch module is controlled to be turned off, and when the switch unit is turned off, the main switch module is controlled to be turned on.

2. The leakage fault rapid disconnection device according to claim 1, characterized in that: The main switch module includes a normally closed relay; the first end of the coil of the normally closed relay is connected to the first voltage, and the second end of the coil is connected to the fast switching module; the moving contact and the static contact of the normally closed relay are respectively connected to the main circuit to control the conduction and shutdown of the main circuit.

3. The leakage fault rapid disconnection device according to claim 2, characterized in that: The main switch module further includes an anti-reverse diode; the cathode of the anti-reverse diode is connected to the first voltage and the first end of the coil of the normally closed relay, and the anode of the anti-reverse diode is connected to the second end of the coil of the normally closed relay.

4. The leakage fault rapid disconnection device according to claim 2 or 3, characterized in that: The switch unit includes a first switch tube, a first resistor and a second resistor; The first end of the latch is connected to the second end of the first switch tube and the second end of the coil of the normally closed relay, the second end is grounded, the third end receives the detection signal, the fourth end is connected to the first end of the first switch tube via the first resistor, the fifth end is connected to the first voltage, and the sixth end receives the reset signal; the third end of the first switch tube is grounded; the second resistor is connected between the first end and the third end of the first switch tube.

5. The leakage fault rapid disconnection device according to claim 4, characterized in that: The model of the latch is SN74LVC1G373DBVR; when the first end of the latch receives a high level, the output level of the fourth end follows the input level state of the third end; when the first end of the latch receives a low level, the fourth end maintains the previous output level state; When the sixth end of the latch receives a low level, the fourth end outputs a high level or a low level; when the sixth end of the latch receives a high level, the fourth end has no output.

6. The leakage fault rapid disconnection device according to claim 2 or 3, characterized in that: The switch unit includes a first switch tube, a first resistor, a second resistor, a second switch tube, a third resistor and a fourth resistor; The first end of the first switch tube is connected to the fourth end of the latch through the first resistor and is grounded through the second resistor; the third end of the first switch tube is grounded and the second end is connected to the first end of the second switch tube through the third resistor; the first end of the second switch tube is connected to the third end of the second switch tube through the fourth resistor at the same time; the second end of the second switch tube is connected to the first voltage; The first end of the latch is connected to the third end of the second switch tube, the second end is grounded, the third end receives the detection signal, the fourth end is connected to the first end of the first switch tube via the first resistor, the fifth end is connected to the first voltage, and the sixth end receives the reset signal.

7. The leakage fault rapid disconnection device according to claim 6, characterized in that: The model of the latch is SN74LVC1G373DBVR; when the first end of the latch receives a high level, the output level of the fourth end follows the input level state of the third end; when the first end of the latch receives a low level, the fourth end maintains the previous output level state; When the sixth end of the latch receives a low level, the fourth end outputs a high level or a low level; when the sixth end of the latch receives a high level, the fourth end has no output.

8. The leakage fault rapid disconnection device according to claim 7, characterized in that: The first switch tube and the second switch tube are triodes; the first end of the switch tube is the base of the triode, the second end is the collector of the triode, and the third end is the emitter of the triode.

9. The leakage fault rapid disconnection device according to claim 2, characterized in that: The leakage current detection module includes a current transformer.

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