Tripping device and tripping system

Abstract

Embodiments of the present disclosure provide a trip device and a trip system comprising the same, the trip device comprising: an interface unit comprising a first input interface adapted to receive a first supply voltage and a second input interface adapted to receive a second supply voltage, the first supply voltage being higher than the second supply voltage; a control circuit coupled to the first input interface to receive the first supply voltage; a trip unit having a first end coupled to the first input interface and a second end coupled to an output of the control circuit, the trip unit being adapted to be turned on and off under control of the control circuit; and a signal generation circuit, an input of the signal generation circuit being coupled to the second input interface to receive the second supply voltage, an output of the signal generation circuit being coupled to the control circuit, the signal generation circuit being adapted to generate an indication signal based on the second supply voltage for indicating presence of an external device connected to the trip device, and to provide the indication signal to the control circuit.

Description

Technical Field

[0001] Embodiments of this disclosure relate to the field of electrical equipment, and more specifically to a tripping device and tripping system. Background Technology

[0002] A molded case circuit breaker is a switching device that houses the contacts, arc-extinguishing chamber, trip unit, and operating mechanism within a single molded case. Molded case circuit breakers protect circuits and power equipment from damage caused by overloads, short circuits, undervoltage, and other faults, and are characterized by their small size, low operating voltage, and short arc distance. Utility Model Content

[0003] In a first aspect of this disclosure, a tripping device is provided, comprising: an interface unit including a first input interface adapted to receive a first supply voltage and a second input interface adapted to receive a second supply voltage, wherein the first supply voltage is higher than the second supply voltage; a control circuit coupled to the first input interface to receive the first supply voltage; a tripping unit having a first end coupled to the first input interface and a second end coupled to the output of the control circuit, the tripping unit being adapted to be turned on and off under the control of the control circuit; and a signal generation circuit having an input end coupled to the second input interface to receive the second supply voltage, an output end coupled to the control circuit, the signal generation circuit being adapted to generate an indication signal based on the second supply voltage for indicating the presence of an external device connected to the tripping device, and to provide the indication signal to the control circuit.

[0004] According to embodiments of the present disclosure, the apparatus can reliably receive a first supply voltage and a second supply voltage for supplying power to the apparatus by providing an on / off interface unit, thereby improving the power supply stability of the apparatus. The control circuit can reliably control the on and off of the trip unit, and the signal generation circuit can generate an indication signal when an external device is connected to the apparatus, thereby improving the reliability of communication between the apparatus and the external device.

[0005] In some embodiments, the control circuit includes: a first voltage conversion circuit, the input of which is coupled to a first input interface to receive a first supply voltage, the first voltage conversion circuit being adapted to convert the first supply voltage into a third supply voltage; a control unit, the control unit being coupled to the output of the first voltage conversion circuit to receive the third supply voltage, the control unit being coupled to the output of a signal generation circuit to receive an indication signal; and a first MOSFET, the gate of which is coupled to the output of the control unit, the first MOSFET being adapted to be turned on and off under the control of the control unit, the drain of which is coupled to a second terminal of a trip unit, and the source of which is coupled to ground.

[0006] In some embodiments, the signal generation circuit includes a second voltage conversion circuit, which includes: a first diode, the anode of which is coupled to a second input interface, the cathode of which is coupled to a first input terminal of the control unit, the first diode being adapted to convert a second supply voltage to a third supply voltage; and a first capacitor, one end of which is coupled to a node between the first diode and the control unit, and the other end of which is coupled to ground.

[0007] In some embodiments, the signal generation circuit further includes an indication signal generation circuit, which includes: a second diode, the anode of which is coupled to ground, and the cathode of which is coupled to a node between the first diode and the second input interface; a first resistor, one end of which is coupled to the node between the first diode and the second diode, and the other end of which is coupled to ground; a second capacitor, one end of which is coupled to the node between the second diode and the first resistor, and the other end of which is coupled to ground; a second resistor, one end of which is coupled to the node between the second capacitor and the first resistor; a third capacitor, one end of which is coupled to the other end of the second resistor, and the other end of which is coupled to ground; and a third resistor, one end of which is coupled to the node between the second resistor and the third capacitor, and the other end of which is coupled to a second input terminal of the control unit.

[0008] In some embodiments, the tripping device further includes: a second MOSFET, the drain of which is coupled to a first input interface and the source of which is coupled to ground; and a voltage detection unit, the input of which is coupled to a first terminal of a fourth capacitor to detect the voltage of the fourth capacitor and the output of which is coupled to the gate of the second MOSFET. The voltage detection unit is adapted to generate an on signal when the voltage of the fourth capacitor exceeds a predetermined threshold to control the second MOSFET to turn on.

[0009] In some embodiments, the interface unit further includes: a third input interface adapted to receive a reference voltage with a predetermined voltage amplitude from an external device; a fourth input interface adapted to receive a first communication signal from an external device; and a signal output interface adapted to send a second communication signal to an external device.

[0010] In a second aspect of this disclosure, a tripping system is provided, comprising: a tripping device of the first aspect of this disclosure; a communication component coupled to the tripping device via a plurality of external lines; and a terminal device coupled to a first input terminal of the communication component via a cable, the terminal device being adapted to supply power voltage to the communication component via the cable.

[0011] In some embodiments, the plurality of external lines include: a first line, one end of which is coupled to a first output terminal of a communication component and the other end of which is coupled to a first input interface, the first line being adapted to deliver a first supply voltage; a second line, one end of which is coupled to a second output terminal of a communication component and the other end of which is coupled to a second input interface, the second line being adapted to deliver a second supply voltage; a third line, one end of which is coupled to a third output terminal of a communication component and the other end of which is coupled to a third input interface of an interface unit, the third line being adapted to deliver a reference voltage having a predetermined voltage amplitude; a fourth line, one end of which is coupled to a fourth output terminal of a communication component and the other end of which is coupled to a fourth input interface of an interface unit, the fourth line being adapted to deliver a first communication signal; and a fifth line, one end of which is coupled to a signal output interface of an interface unit and the other end of which is coupled to a second input terminal of a communication component, the fifth line being adapted to deliver a second communication signal.

[0012] In some embodiments, the communication component includes: a voltage converter, the input of which is coupled to a cable, the voltage converter being adapted to convert a power supply voltage into a second supply voltage; and a fourth resistor, one end of which is coupled to the output of the voltage converter and the other end of which is coupled to a second line.

[0013] It should be understood that the content described in this section is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0014] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:

[0015] Figure 1 A circuit diagram of a tripping system according to an embodiment of the present disclosure is shown.

[0016] Explanation of reference numerals in the attached figures:

[0017] 100 Tripping device 110 Interface unit

[0018] 120 Control circuit 130 Tripping unit

[0019] 140 Signal generation unit 121 First voltage conversion circuit

[0020] 122 Control Unit 123 First MOSFET

[0021] 141 Second voltage conversion circuit 142 Indicator signal generation circuit

[0022] 1411 First diode; 1412 First capacitor

[0023] 1421 Second diode 1422 First resistor

[0024] 1423 Second capacitor 1424 Second resistor

[0025] 1425 Third capacitor 1426 Third resistor

[0026] 111 First input interface 112 Second input interface

[0027] 150 Fourth capacitor 160 Second MOSFET

[0028] 170 Voltage detection unit 113 Third input interface

[0029] 114 Fourth Input Interface; 115 Signal Output Interface

[0030] 200 communication components and over 300 external lines

[0031] 400 terminal equipment 500 cable

[0032] 301 First Line; 302 Second Line

[0033] 303, Line 3; 304, Line 4

[0034] 305 Fifth Line 201 Voltage Converter

[0035] 202 Fourth Resistor Detailed Implementation

[0036] Preferred embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0037] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects.

[0038] As described above, molded case circuit breakers protect lines and power equipment from damage caused by faults such as overload, short circuit, and undervoltage. During operation, the internal control unit drives the tripping mechanism to connect and disconnect the circuit. Furthermore, the control unit can communicate with external devices via the Universal Serial Bus (USB) interface on the molded case circuit breaker to perform functions such as firmware upgrades and tripping tests.

[0039] However, if tripping occurs during a firmware upgrade, the internal capacitors of the molded case circuit breaker provide a lower supply voltage, which can easily cause instability in the power supply to the control unit. This will affect communication between the control unit and external devices. Furthermore, when external devices supply power to the molded case circuit breaker via USB cable, the voltage signal waveform input through the USB interface is a square wave instead of a constant voltage due to voltage modulation within the circuit breaker. This signal type makes it difficult for the control unit to determine whether an external device is connected, thus affecting communication between the control unit and the external device.

[0040] This disclosure provides a tripping device in which a switching interface unit reliably receives a first supply voltage and a second supply voltage for powering the device, thereby improving the power supply stability of the device. A control circuit reliably controls the tripping unit to turn on and off, and a signal generation circuit generates an indication signal when an external device is connected to the device, thus improving the reliability of communication between the device and the external device. In the following, [further details will be provided]. Figure 1 The principles of this disclosure are described.

[0041] Figure 1 A circuit diagram of a tripping system according to an embodiment of the present disclosure is shown. Figure 1 As shown, the system described herein generally includes a tripping device 100, a communication component 200, and a terminal device 400. The communication component 200 is coupled to the tripping device 100 via multiple external lines 300 to supply power voltage and communication signals to the tripping device 100. The terminal device 400 is coupled to the communication component 200 via a cable 500. The terminal device 400 can supply power to the communication component 200 via the cable 500 and can receive communication data through the communication component 200 to monitor the operating status of the tripping device 100.

[0042] In one embodiment, the terminal device 400 may be a computer device on a personal computer (PC). The terminal device 400 can be used to perform functions such as firmware upgrades or tripping tests on the tripping device 100. It should be understood that, based on the teachings of this disclosure, those skilled in the art can conceive of any type of terminal device to implement the above functions, and all such implementations fall within the scope of this disclosure.

[0043] In one embodiment, cable 500 may be a USB cable, and communication component 200 may be a USB debugging component. Communication component 200 can receive power voltage and communication signals from terminal device 400 via cable 500, and can communicate with tripping device 100 via multiple external lines 300.

[0044] Continue to refer to Figure 1 In one embodiment, the plurality of external lines 300 may include a first line 301 adapted to transmit a first supply voltage and a second line 302 adapted to transmit a second supply voltage. For example, the first supply voltage may be the total power supply voltage that powers all the devices within the tripping device 100 as a whole, and its voltage amplitude may be, for example, 16.5V. The second supply voltage may be an additional power supply voltage that independently powers the communication devices within the tripping device 100, and its voltage amplitude may be, for example, 3.6V. This arrangement ensures stable communication after the tripping device 100 trips.

[0045] In one embodiment, the plurality of external lines 300 may further include a third line 303 adapted to transmit a reference voltage, a fourth line 304 adapted to transmit a first communication signal, and a fifth line 305 adapted to transmit a second communication signal. For example, the third line 303 may be connected to ground, i.e., the voltage amplitude of the reference voltage may be 0V. The first communication signal may be a command signal sent by the communication component 200 to the tripping device 100. The command signal may include, for example, instructions and data for the tripping device 100 to perform firmware upgrades and tripping tests. The second communication signal may be a feedback signal sent by the tripping device 100 to the communication component 200. The feedback signal may include, for example, data indicating the operating status and task execution of the tripping device 100. It should be understood that the numbers or values ​​involved in the embodiments of this disclosure are merely exemplary and do not constitute a limitation on the scope of this disclosure.

[0046] In one embodiment, such as Figure 1 As shown, the communication component 200 may include a voltage converter 201 adapted to convert a power supply voltage into a second supply voltage and a fourth resistor 202. The input of the voltage converter 201 is coupled to a cable 500. One end of the fourth resistor 202 is coupled to the output of the voltage converter 201, and the other end is coupled to a second line 302. In one embodiment, the voltage amplitude of the power supply voltage may be 5V. The voltage converter 201 may be a low-dropout linear regulator (LDO). It should be understood that, based on the teachings given in this disclosure, those skilled in the art can conceive of any type of voltage converter to achieve the above functions, and such implementations fall within the scope of this disclosure.

[0047] The following text will continue to refer to Figure 1 A detailed description of the example circuit structure of the tripping device 100 is provided.

[0048] In one embodiment, such as Figure 1 As shown, the tripping device 100 may include an interface unit 110, a control circuit 120, a tripping unit 130, and a signal generation circuit 140. The interface unit 130 may include a first input interface 111 adapted to receive a first supply voltage and a second input interface 112 adapted to receive a second supply voltage. The first input interface 111 is coupled to a first line 301. The second input interface 112 is coupled to a second line 302. The control circuit 120 is coupled to the first input interface 111 to receive the first supply voltage. A first end of the tripping unit 130 is coupled to the first input interface 111, and a second end is coupled to the output of the control circuit 120. The tripping unit 130 is adapted to be turned on and off under the control of the control circuit 120. The input of the signal generation circuit 140 is coupled to the second input interface 112 to receive the second supply voltage. The output of the signal generation circuit 140 is coupled to the control circuit 120. The signal generation circuit 140 is adapted to generate an indication signal based on the second supply voltage to indicate the presence of an external device connected to the tripping device 100, and to provide the indication signal to the control circuit 120.

[0049] In one embodiment, the interface unit 130 may further include a third input interface 113 adapted to receive a reference voltage from the communication component 200, a fourth input interface 114 adapted to receive a first communication signal from the communication component 200, and a signal output interface 115 adapted to send a second communication signal to the communication component 200. The third input interface 113 is coupled to a third line 303. The fourth input interface 114 is coupled to a fourth line 304. The signal output interface 115 is coupled to a fifth line 305. It should be understood that the interface unit 130 may also include other suitable types of interfaces to implement other functions, and this disclosure is not limiting in this regard.

[0050] In one embodiment, the control circuit 120 may include a first voltage conversion circuit 121, a control unit 122, and a first MOSFET 123. The input terminal of the first voltage conversion circuit 121 is coupled to a first input interface 111 to receive a first supply voltage. The first voltage conversion circuit 121 is adapted to convert the first supply voltage to a third supply voltage. The control unit 122 is coupled to the output terminal of the first voltage conversion circuit 121 to receive the third supply voltage. The control unit 122 is coupled to the output terminal of a signal generation circuit 140 to receive an indication signal. The gate of the first MOSFET 123 is coupled to the output terminal of the control unit 130. The first MOSFET 123 is adapted to be turned on and off under the control of the control unit 122. The drain of the first MOSFET 123 is coupled to a second terminal of a trip unit 130. The source of the first MOSFET 123 is coupled to ground.

[0051] In one embodiment, the first voltage conversion circuit 121 may be a buck converter, such as a Buck circuit. The voltage amplitude of the third supply voltage may be 3.3V, which is the rated power supply voltage of the control unit 122.

[0052] In one embodiment, the control unit 122 may be a microcontroller unit (MCU). The control unit 122 can output a drive voltage upon detecting a short circuit or overload in the circuit to drive the first MOSFET 123 to turn on, thereby causing the trip unit 130 to perform a tripping action. In one embodiment, the trip unit 130 may be an electronic trip unit. When the first MOSFET 123 is turned on, the coil within the trip unit 130 is energized to generate a magnetic field, which in turn drives the mechanical contacts to complete the tripping action. In other embodiments, the trip unit 130 may also be a thermomagnetic trip unit, etc. It should be understood that, based on the teachings given in this disclosure, those skilled in the art can conceive of any type of trip unit to implement the above functions, and all such implementations fall within the scope of this disclosure.

[0053] Continue to refer to Figure 1 In one embodiment, the signal generation circuit 140 may include a second voltage conversion circuit 141. The second voltage conversion circuit 141 includes a first diode 1411 and a first capacitor 1412. The anode of the first diode 1411 is coupled to a second input interface 112. The cathode of the first diode 1411 is coupled to a first input terminal of the control unit 122. The first diode 1411 is adapted to convert a second supply voltage to a third supply voltage. One end of the first capacitor 1412 is coupled to a node between the first diode 1411 and the control unit 122. The other end of the first capacitor 1412 is coupled to ground. In one embodiment, the first diode 1411 may be a low-dropout diode. For example, the first diode 1411 may receive a second supply voltage of 3.6V and output a third supply voltage of 3.3V when turned on. Furthermore, the first diode 1411 may also reverse-intercept the voltage output by the first voltage conversion circuit 121 to prevent the power supply of the first voltage conversion circuit 121 to the control unit 122 from affecting the normal operation of the second voltage conversion circuit 141.

[0054] In one embodiment, the first capacitor 1412 can filter the voltage signal output by the first diode 1411 to provide a stable power supply to the control unit 122.

[0055] In one embodiment, the signal generation circuit 140 may further include an indication signal generation circuit 142. The indication signal generation circuit 142 includes a second diode 1421, a first resistor 1422, a second capacitor 1423, a second resistor 1424, a third capacitor 1425, and a third resistor 1426. One end of the first resistor 1422 is coupled to a node between the first diode 1422 and the second diode 1422. The other end of the first resistor 1422 is coupled to ground. One end of the second capacitor 1423 is coupled to a node between the second diode 1421 and the first resistor 1422. The other end of the second capacitor 1423 is coupled to ground. One end of the second resistor 1424 is coupled to a node between the second capacitor 1423 and the first resistor 1422. One end of the third capacitor 1425 is coupled to the other end of the second resistor 1424. The other end of the third capacitor 1425 is coupled to ground. One end of the third resistor 1426 is coupled to a node between the second resistor 1424 and the third capacitor 1425. The other end of the third resistor 1426 is coupled to the second input terminal of the control unit 122.

[0056] In one embodiment, the second diode 1421 can clamp the second supply voltage to prevent excessive input voltage from causing the indication signal to fail to generate properly. The first resistor 1422, coupled to ground, allows the control unit 122 to detect a stable low-level signal when no external device is connected, thus preventing it from floating.

[0057] In one embodiment, the second capacitor 1423, the second resistor 1424, the third capacitor 1425, and the third resistor 1426 can filter the input voltage signal to generate an indication signal, i.e., a stable high-level signal, when an external device is connected, thereby enabling the control unit 122 to accurately identify the connection of an external device and improving the stability of device communication.

[0058] Continue to refer to Figure 1 In one embodiment, the tripping device 100 may further include a fourth capacitor 150, a second MOSFET 160, and a voltage detection unit 170. One end of the fourth capacitor 150 is coupled to the first input interface 111 and the other end is coupled to ground. The drain of the second MOSFET 160 is coupled to the first input interface 111. The source of the second MOSFET 160 is coupled to ground. The input terminal of the voltage detection unit 170 is coupled to the first terminal of the fourth capacitor 150 to detect the voltage of the fourth capacitor 150. The output terminal of the voltage detection unit 170 is coupled to the gate of the second MOSFET 160.

[0059] The fourth capacitor 150 can begin charging upon receiving the first supply voltage. If the voltage of the fourth capacitor 150 exceeds a predetermined threshold (e.g., 13V), the voltage detection unit 170 can generate an on-signal to control the second MOSFET 160 to turn on, thereby stopping the fourth capacitor 150 from charging. If the trip unit 130 trips, the fourth capacitor 150 can release electrical energy to supply power to the first voltage conversion circuit 121.

[0060] In one embodiment, the voltage detection unit 170 may employ a comparator circuit to output a low-level signal when the voltage of the fourth capacitor 150 is below a predetermined threshold, and to output a high-level signal when the voltage of the fourth capacitor 150 exceeds the predetermined threshold. It should be understood that, based on the teachings of this disclosure, those skilled in the art can conceive of any type of voltage detection circuit to implement the above functions, and such implementations all fall within the scope of this disclosure.

[0061] In one embodiment, the tripping device 100 may further include a fifth capacitor 180. One end of the fifth capacitor 180 is connected to the node between the first voltage conversion circuit 121 and the first input interface 111, and the other end is connected to ground, so that the tripping device 100 and the communication component 200 are connected to a common ground, thereby ensuring that the tripping device 100 and the communication component 200 have a common reference voltage.

[0062] The tripping device and tripping system provided according to the embodiments of this disclosure can ensure that the power supply to the control unit remains continuous in the event of a trip, improve the communication quality between the control unit and external devices, and avoid the situation where firmware upgrades fail.

[0063] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A tripping device (100), characterized in that, include: The interface unit (110) includes a first input interface (111) adapted to receive a first power supply voltage and a second input interface (112) adapted to receive a second power supply voltage, wherein the first power supply voltage is higher than the second power supply voltage; A control circuit (120) is coupled to the first input interface (111) to receive the first supply voltage; A trip unit (130), having a first end coupled to the first input interface (111) and a second end coupled to the output of the control circuit (120), the trip unit (130) being adapted to be switched on and off under the control of the control circuit (120); and A signal generation circuit (140) is provided, with its input terminal coupled to the second input interface (112) to receive the second power supply voltage, and its output terminal coupled to the control circuit (120). The signal generation circuit (140) is adapted to generate an indication signal based on the second power supply voltage to indicate the presence of an external device connected to the tripping device (100), and to provide the indication signal to the control circuit (120).

2. The tripping device (100) according to claim 1, characterized in that, The control circuit (120) includes: A first voltage conversion circuit (121) is coupled to the first input interface (111) to receive the first supply voltage. The first voltage conversion circuit (121) is adapted to convert the first supply voltage into a third supply voltage. A control unit (122), coupled to the output of the first voltage conversion circuit (121) to receive the third supply voltage, and coupled to the output of the signal generation circuit (140) to receive the indication signal; and The first MOS transistor (123) has its gate coupled to the output terminal of the control unit (122), and is adapted to be turned on and off under the control of the control unit (122). The drain of the first MOS transistor (123) is coupled to the second terminal of the trip unit (130), and the source of the first MOS transistor (123) is coupled to ground.

3. The tripping device (100) according to claim 2, characterized in that, The signal generation circuit (140) includes a second voltage conversion circuit (141), which includes: A first diode (1411), the anode of which is coupled to the second input interface (112), and the cathode of which is coupled to the first input terminal of the control unit (122), wherein the first diode (1411) is adapted to convert the second supply voltage to the third supply voltage; and A first capacitor (1412) has one end coupled to a node between the first diode (1411) and the control unit (122), and the other end coupled to ground.

4. The tripping device (100) according to claim 3, characterized in that, The signal generation circuit (140) further includes an indication signal generation circuit (142), which includes: The second diode (1421) has its anode coupled to ground and its cathode coupled to the node between the first diode (1411) and the second input interface (112). A first resistor (1422) has one end coupled to the node between the first diode (1422) and the second diode (1422), and the other end coupled to ground; The second capacitor (1423) has one end coupled to the node between the second diode (1421) and the first resistor (1422), and the other end coupled to ground; A second resistor (1424) is connected at one end to a node between the second capacitor (1423) and the first resistor (1422); A third capacitor (1425), one end of which is coupled to the other end of the second resistor (1424), and the other end of which is coupled to ground; and A third resistor (1426) is connected at one end to a node between the second resistor (1424) and the third capacitor (1425), and at the other end to a second input terminal of the control unit (122).

5. The tripping device (100) according to claim 1, characterized in that, The tripping device (100) further includes a fourth capacitor (150), one end of which is coupled to the first input interface (111) and the other end is coupled to ground.

6. The tripping device (100) according to claim 5, characterized in that, The tripping device (100) further includes: A second MOSFET (160) has its drain coupled to the first input interface (111) and its source coupled to ground; and A voltage detection unit (170) is provided, wherein the input terminal of the voltage detection unit (170) is coupled to the first terminal of the fourth capacitor (150) to detect the voltage of the fourth capacitor (150), and the output terminal of the voltage detection unit (170) is coupled to the gate of the second MOS transistor (160). The voltage detection unit (170) is adapted to generate a turn-on signal when the voltage of the fourth capacitor (150) exceeds a predetermined threshold, so as to control the second MOS transistor (160) to turn on.

7. The tripping device (100) according to claim 1, characterized in that, The interface unit (110) further includes: A third input interface (113) is adapted to receive a reference voltage with a predetermined voltage amplitude from the external device; A fourth input interface (114), the fourth input interface (114) being adapted to receive a first communication signal from the external device; and A signal output interface (115) is adapted to send a second communication signal to the external device.

8. A tripping system, characterized in that, include: The tripping device (100) according to any one of claims 1 to 7; A communication component (200) is coupled to the tripping device (100) via a plurality of external lines (300); as well as A terminal device (400) is coupled to a first input terminal of the communication component (200) via a cable (500), and the terminal device (400) is adapted to supply power voltage to the communication component (200) via the cable (500).

9. The tripping system according to claim 8, characterized in that, The plurality of external lines (300) include: A first line (301) has one end coupled to a first output terminal of the communication component (200) and the other end coupled to the first input interface (111), and the first line (301) is adapted to transmit the first power supply voltage; The second line (302) has one end coupled to the second output terminal of the communication component (200) and the other end coupled to the second input interface (112), and the second line (302) is adapted to transmit the second power supply voltage; A third line (303) is coupled at one end to the third output terminal of the communication component (200) and at the other end to the third input interface (113) of the interface unit (110). The third line (303) is adapted to transmit a reference voltage with a predetermined voltage amplitude. A fourth line (304), one end of which is coupled to the fourth output terminal of the communication component (200) and the other end of which is coupled to the fourth input interface (114) of the interface unit (110), the fourth line (304) being adapted to transmit a first communication signal; and The fifth line (305) is coupled at one end to the signal output interface (115) of the interface unit (110) and at the other end to the second input terminal of the communication component (200), and the fifth line (305) is adapted to transmit a second communication signal.

10. The tripping system according to claim 9, characterized in that, The communication component (200) includes: A voltage converter (201), the input of which is coupled to the cable (500), the voltage converter (201) being adapted to convert the power supply voltage into the second supply voltage; and The fourth resistor (202) is coupled at one end to the output of the voltage converter (201) and at the other end to the second line (302).

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