Leakage protection device with linkage control

Abstract

A linkage-controllable leakage protection device comprises: a leakage detection unit; a self-test unit; and a switch control unit for controlling the action of a switch module, wherein the switch control unit comprises: a relay module; an auxiliary element, wherein the auxiliary element is coupled to the relay module and the switch module and is configured to be closed or opened simultaneously with the switch module; a drive module, comprising at least one semiconductor element, wherein the at least one semiconductor element is coupled to the relay module, the auxiliary element, the leakage detection unit and / or the self-test unit, wherein the drive module is configured to, upon detecting a leakage fault signal and / or a self-test fault signal, turn on the at least one semiconductor element, thereby de-energizing the relay module, thereby disconnecting the power connection and disconnecting the auxiliary element, and further turning off the at least one semiconductor element; and is further configured to, upon detecting that at least one semiconductor element is short-circuited, de-energize the relay module, thereby disconnecting the switch module and the auxiliary element.

Description

Technical Field

[0001] The invention relates to the electrical field, and in particular to a linkage-controllable leakage protection device. Background Art

[0002] As people's awareness of electricity safety continues to improve, ground fault (leakage) protection devices are used more and more widely. However, the relay-type ground fault (leakage) protection devices currently used still have some defects. For example, when the detection circuit components in the ground fault (leakage) protection device are damaged and lose their protection function, the coil of the relay is still energized, the input and output power connections are normal, and the user is unable to determine that the ground fault (leakage) protection function has failed, posing a safety hazard.

[0003] Therefore, there is an urgent need for an effective leakage protection device for detecting component damage. Summary of the invention

[0004] Based on the above problems, the present invention proposes, on one hand, a linkage-controllable leakage protection device, comprising: a leakage detection unit, used to detect whether there is a leakage fault signal at the output end of the power supply line; a self-test unit, used to periodically generate a self-test pulse signal simulating the leakage fault signal to detect whether the leakage detection unit fails. When the leakage detection unit fails, the self-test unit sends a self-test fault signal; and a switch control unit, used to control the action of a switch module between the input end and the output end of the power supply line, thereby controlling the power connection between the input end and the output end of the power supply line, the switch control unit comprising: a relay module, the relay module is coupled to the switch module; an auxiliary element, the auxiliary element is coupled to the relay module and the switch module, and is Configured to be closed or opened simultaneously with the switch module; a driving module, comprising at least one semiconductor element, wherein the at least one semiconductor element is coupled to the relay module, the auxiliary element, the leakage detection unit and / or the self-test unit, wherein the driving module is configured to, upon detecting the leakage fault signal and / or the self-test fault signal, turn on the at least one semiconductor element, thereby causing the relay module to lose power, thereby causing the switch module to disconnect the power connection and disconnect the auxiliary element, thereby causing the at least one semiconductor element to be cut off; and the driving module is also configured to, upon detecting that the at least one semiconductor element is short-circuited, cause the relay module to lose power, thereby causing the switch module to disconnect the power connection and disconnect the auxiliary element.

[0005] In one embodiment, the leakage protection device also includes an alarm module, which is configured to be turned on and send an alarm signal in response to the detected leakage fault signal and / or the self-test fault signal or the self-test pulse signal when it detects that all semiconductor elements of the at least one semiconductor element are short-circuited.

[0006] In one embodiment, the alarm module includes at least an alarm device and a first semiconductor element, the alarm device is connected in series with the first semiconductor element, and the control electrode of the first semiconductor element is coupled to the leakage detection unit and / or the self-test unit, and the alarm signal is generated by the alarm device.

[0007] In one embodiment, the alarm device includes a light emitting device and / or a sound emitting device, wherein the light emitting device is used to generate a light signal, and the sound emitting device is used to generate a sound signal.

[0008] In one embodiment, the auxiliary element is a switching element.

[0009] In one embodiment, the switch control unit further includes a relay starting module and a relay holding module, the relay module includes a first coil and a second coil, the relay starting module is connected to the first coil, and is used to energize the first coil to make the switch module attracted and close the auxiliary element, the relay holding module is connected to the second coil, and is used to energize the second coil when the auxiliary element is closed, so that the switch module remains attracted, and when the auxiliary element is disconnected, the second coil is de-energized, so that the switch module is disconnected.

[0010] In one implementation, the semiconductor element and the first semiconductor element are any one of a thyristor, a MOS tube or a triode.

[0011] On the other hand, the present invention proposes an alarm-capable leakage protection device, comprising: a leakage detection unit, used to detect whether there is a leakage fault signal at the output end of the power supply line; a self-test unit, used to periodically generate a self-test pulse signal simulating the leakage fault signal to detect whether the leakage detection unit fails, when the leakage detection unit fails, the self-test unit sends a self-test fault signal; and a switch control unit, used to control the action of a switch module between the input end and the output end of the power supply line, thereby controlling the power connection between the input end and the output end of the power supply line, the switch control unit comprising: a relay module, the relay module is coupled to the switch module; an auxiliary element, the auxiliary element is coupled to the relay module and the switch module, and is configured to be configured to be closed or opened simultaneously with the switch module; a drive module, comprising at least one semiconductor element, coupled to the relay module, the switch auxiliary element, the leakage detection unit and / or the self-test unit, wherein the drive module is configured to detect the leakage fault signal and / or the self-test fault signal When the at least one semiconductor element is short-circuited, the at least one semiconductor element is turned on, so that the relay module is de-energized, so that the switch module disconnects the power connection and disconnects the switch auxiliary element, and then the at least one semiconductor element is cut off; and the driving module is also configured to de-energize the relay module when it is detected that the at least one semiconductor element is short-circuited, so that the switch module disconnects the power connection and disconnects the switch auxiliary element; and an alarm module, the alarm module at least includes: a first resistor; an alarm device; and a first semiconductor element, wherein the first resistor is connected in series with the alarm device and the first electrode of the first semiconductor element, and then connected in parallel with the at least one semiconductor element as a whole, the control electrode of the first semiconductor element is coupled to the leakage detection unit and / or the self-test unit, and wherein the alarm device is configured to be turned on and send an alarm signal in response to the detected self-test pulse signal or the self-test fault signal and / or the leakage fault signal when all semiconductor elements in the at least one semiconductor element are detected to be short-circuited.

[0012] In one embodiment, the alarm device includes a light emitting device and / or a sound emitting device, wherein the light emitting device is used to generate a light signal, and the sound emitting device is used to generate a sound signal.

[0013] In one embodiment, the auxiliary element is a switching element.

[0014] In one embodiment, the switch control unit further includes a relay starting module and a relay holding module, the relay module includes a first coil and a second coil, the relay starting module is connected to the first coil, and is used to energize the first coil to make the switch module attracted and close the auxiliary element, the relay holding module is connected to the second coil, and is used to energize the second coil when the auxiliary element is closed, so that the switch module remains attracted, and when the auxiliary element is disconnected, the second coil is de-energized, so that the switch module is disconnected.

[0015] In one implementation, the semiconductor element and / or the first semiconductor element is any one of a thyristor, a MOS tube or a triode.

[0016] The leakage protection device disclosed in the present invention can ensure that the circuit can be safely turned on and off by adopting an auxiliary element linked to the power switch. At the same time, it can promptly send out an alarm signal to remind the user to replace the product when the control element fails or is damaged, thereby better protecting personal or property safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The embodiments are shown and explained with reference to the accompanying drawings. These drawings are used to explain the basic principles, and only the aspects necessary for understanding the basic principles are shown. These drawings are not drawn to scale. In the accompanying drawings, the same reference numerals represent similar features.

[0018] Figure 1 is a schematic diagram of the circuit structure of an embodiment of a linkage-controllable leakage protection device according to the present disclosure;

[0019] Figure 2 It is a circuit structure diagram of another embodiment of a linkage-controllable leakage protection device according to the contents of the present disclosure. DETAILED DESCRIPTION

[0020] In the following specific description of the preferred embodiments, reference will be made to the attached drawings which constitute a part of the present invention. The attached drawings show by way of example specific embodiments that can implement the present invention. The illustrative embodiments are not intended to be exhaustive of all embodiments according to the present invention. It will be appreciated that other embodiments may be utilized, and structural or logical modifications may also be made without departing from the scope of the present invention. Therefore, the following specific description is not restrictive, and the scope of the present invention is limited by the appended claims.

[0021] The technologies, methods and devices known to those skilled in the art may not be discussed in detail, but where appropriate, the technologies, methods and devices shall be considered as part of the specification. The connection lines between the units in the drawings are only for the convenience of explanation, which means that at least the units at both ends of the connection lines are in communication with each other, and are not intended to limit the inability of unconnected units to communicate with each other.

[0022] The present disclosure provides a linkage controllable leakage protection device, which includes a switch module, a switch control unit, a leakage detection unit, and a self-test unit. The switch module is coupled to the power supply line to control the power connection between the input terminal LINE and the output terminal LOAD of the power supply line, the leakage detection unit is coupled to the power supply line to detect whether there is a leakage fault signal at the output terminal LOAD of the power supply line, the self-test unit is coupled to the power supply line and the leakage detection unit to periodically generate a self-test pulse signal simulating a leakage fault signal to detect whether the leakage detection unit fails, and when the leakage detection unit fails, a self-test fault signal is issued, the switch control unit includes a relay module, an auxiliary element, and a drive module, the relay module is coupled to the switch module, the auxiliary element is coupled to the relay module and the switch module, and the auxiliary element is The drive module is configured to be closed or turned off simultaneously with the switch module, and the drive module includes at least one semiconductor element, which is coupled to the relay module, the auxiliary element, the leakage detection unit and / or the self-test unit, wherein the drive module is configured to turn on the at least one semiconductor element when a leakage fault signal and / or a self-test fault signal is detected, thereby causing the relay module to lose power, thereby causing the switch module to disconnect the power connection and the auxiliary element to disconnect, and then causing the at least one semiconductor element to be cut off; and the drive module is also configured to cause the relay module to lose power when it is detected that the at least one semiconductor element is short-circuited, thereby causing the switch module to disconnect the power connection and the auxiliary element to disconnect.

[0023] Figure 1 1 is a schematic diagram of a circuit structure of an embodiment of a linkage controllable leakage protection device according to the present disclosure. Specifically, Figure 1As shown, the switch module includes a power switch SW, the switch control unit 1 includes a trip circuit 11 (including a relay module and a relay holding module), a start circuit 12 (i.e., a relay start module), a drive circuit 13 (i.e., a drive module), and an alarm circuit (module) 14. The relay module includes a relay coil RELAY1 (i.e., a first coil) and a relay coil RELAY1 (i.e., a second coil). The power switch SW is connected to the input end LINE of the power supply line, and the electrical coil RELAY1 is coupled to SW. The power supply line L is connected to the control electrode of the semiconductor element Q1 via diodes D1, D2, resistors R6, R8, and capacitor C8 on the one hand, and is connected to the first electrode of Q1 via relay1 on the other hand, and the second electrode of the semiconductor element Q1 is grounded. In addition, the diode D1 is connected to the power supply line N via resistor R4, a switch element (auxiliary element) S1, a resistor R22, and RELAY2 (the relay holding module includes D1, R4, switch elements S1, and R22). The start circuit 12 includes Q1, a resistor R17, capacitors C8, C10, and a resistor R8, and is used to energize the relay coil RELAY1 when the power is turned on, so that the switch SW is attracted. The drive circuit 13 includes a semiconductor element Q3, a resistor R12, and a capacitor C13. The first electrode of Q3 is connected to the end of the resistor S1 close to the resistor R22, the second electrode of Q3 is connected to the second electrode of Q1, R21 is connected in parallel with C13, and the first end after parallel connection is connected to the control electrode of Q3, and the second end after parallel connection is connected to the second electrode of Q3. The alarm circuit 14 includes a resistor R15, a light emitting diode LED, and a semiconductor element Q5. The first end of the resistor R15 is connected to the first electrode of Q3 on the one hand, and is coupled to the end of the input terminal resistor S1 close to the resistor R22 on the other hand. The second end of the resistor R15 is connected in series via the light emitting diode LED and the first electrode of Q5. The second electrode of Q5 is connected to the second electrode of Q3, and the control electrode of Q5 is connected to the first end of R21 and the first end of C13. In addition, the switch control unit 1 also includes a normally open switch component RESET, the two ends of which are respectively connected to an end of R8 close to C8 and the third pole of Q3. The circuit can be reset after a leakage fault or a self-detection fault occurs by closing the component RESET.

[0024] Also like Figure 1As shown, the leakage detection unit 1 includes a leakage detection loop CT1 passing through the phase line (L) and the neutral line (N), a neutral line detection loop CT2, a processor U1 and other components. The self-test unit 3 includes semiconductor components Q2, Q4, a processor U2, resistors R16, R18, a capacitor C14, a diode D7 and other components. CT1 is connected to the semiconductor element Q2 of the self-test unit 3 via the diode D3 and the resistor R7 of the self-test unit 3. The pin 7 of the processor U1 is connected to the resistor R21 of the switch control unit 1 and the first end of the capacitor C13 via the diodes D5 and R14 and is connected to the control electrode of Q3 and the control electrode of the semiconductor element Q5. On the other hand, it is connected to the control electrode of Q4 via the resistor R11. The pin 4 of the processor U2 is connected to the resistor R21 of the switch control unit 1 and the first end of the capacitor C13 via the resistor R18 and the diode D7 and is connected to the control electrode of Q3 and the control electrode of the semiconductor element Q5. On the other hand, it is connected to the first end of the capacitor C14 via the resistor R18. The second end of the capacitor C14 is grounded. The first end of Q4 is connected to the pin 1 of U2 on the one hand and to the first end of the resistor R12 and the first end of the capacitor C11 on the other hand. The second end of the capacitor C11 is grounded. The second end of the resistor R12 is coupled to the power supply line. The second end of Q4 is connected to the pin 2 of the processor U2 on the one hand and is grounded on the other hand. When there is a leakage fault signal, the leakage detection ring CT1 will generate a corresponding voltage signal. The processor U1 detects the corresponding voltage change generated by the leakage detection ring CT1 to make pin 7 output a trigger signal, and charges the capacitor C13 through R14. After a period of time, Q3 is turned on, and then the relay coil RELAY2 is de-energized, so that the switch SW of the switch module is disconnected and the switch element S1 is disconnected.

[0025] Under normal circumstances, the processor U2 periodically generates a self-test pulse simulating a leakage fault signal. When the leakage detection unit 2 works normally, pin 7 generates a trigger signal, which is fed back to Q4 via R11. When Q4 is turned on, the processor U2 is turned off, and then pin 4 stops the leakage detection unit 2 from outputting a self-test pulse signal. When a self-test fault such as a short circuit of the capacitor C1 or the leakage detection loop CT1 occurs, Q4 cannot detect the feedback trigger signal, and pin 4 of U2 continues to output a high potential (i.e., a self-test fault signal is issued). It should be understood that the high potential here refers to a potential exceeding a predetermined threshold. Both the trigger signal and the self-test fault signal will cause Q3 to turn on, thereby de-energizing the relay coil RELAY2, and then the switch SW disconnects the power connection while the switch element S1 is disconnected, and further Q3 is in the cut-off state. When Q3 is short-circuited, the relay coil RELAY2 can be de-energized, and the power switch SW is disconnected. When Q3 is disconnected, the semiconductor element Q5 of the alarm circuit 14 is turned on based on the trigger signal sent by pin 7 of U1 and / or the self-test pulse signal and self-test fault signal sent by pin 4 of U1, so that the alarm circuit 14 works and sends an alarm signal.

[0026] The working principle of this embodiment is described below.

[0027] When the input LINE of the ground fault (leakage) protection device is powered on, L-D1-D2-R6-R8 charges C8, causing Q1 to conduct, and then L-RELAY1-Q1-N forms a current loop. Since the loop generates a large current, it drives RELAY1 to generate a large magnetic field, prompting the power switch SW to close. At the same time, the switch element S1 is linked to the power switch SW to close, so that D1-R4-S1-R22-RELAY2-N forms a current loop, and the relay coil RELAY2 is energized to keep the power switch SW closed, realizing a reliable power connection between the input LINE and the output LOAD.

[0028] At the same time, D2 is turned on to provide working power to the ground fault (leakage) detection circuit 2. D4 is turned on to provide working power to the self-test circuit 3.

[0029] When a ground fault (leakage) signal appears, the leakage detection loop CT1 transmits the detected leakage fault signal to the processor U1, and the pin 7 of the processor U1 outputs a trigger signal, which triggers the semiconductor element Q3 to turn on through D5 and R14, lowering the potential of point A, causing the relay coil RELAY2 to lose power, disconnecting the power switch SW, and at the same time, the switch element S1 is disconnected from the power switch SW, and the relay coil RELAY2 can no longer be attracted, thereby protecting personal or property safety.

[0030] Operate RESET to discharge the electricity stored in C8, and then power on and the power switch SW is closed again, thus achieving a normal working cycle.

[0031] When the ground fault (leakage) detection leakage function of the ground fault (leakage) protection device is lost, for example, the detection coil CT1 is short-circuited or the processor U1 is damaged, and the self-detection circuit periodically sends a self-detection signal that cannot be fed back to the self-detection circuit, the resistor R18 will charge the capacitor C14, the diode D7 will be turned on, triggering the semiconductor element Q3 to turn on, lowering the potential of point A, causing the relay RELAY2 to lose power, disconnecting the power switch SW, and at the same time, the switch element S1 is disconnected from the power switch SW, and the relay coil RELAY2 can no longer be attracted, thereby protecting the safety of people or property.

[0032] Similarly, when the semiconductor element Q3 in the drive circuit 13 is short-circuited, the potential of point A is lowered, causing the relay coil RELAY2 to lose power and disconnect the power switch SW. At the same time, the switch element S1 is disconnected from the power switch SW, and the relay coil RELAY2 can no longer be attracted, thereby protecting the safety of people or property.

[0033] When the semiconductor element Q3 in the driving circuit 13 is open circuit (damaged), the self-test pulse signal or self-test fault signal and / or ground fault (leakage fault) signal will trigger the semiconductor element Q5 of the alarm circuit 14 to turn on, and L-D1-R4-S1-R15-LED-Q5-N forms a current loop, indicating that the circuit is working normally and the LED lights up to remind the user that the product needs to be replaced.

[0034] It should be understood that although Figure 1 In the illustrated embodiment, the alarm circuit includes a resistor R12, a light emitting diode LED, and a semiconductor element Q5; however, in other embodiments, the light emitting diode LED may also be replaced by a sound-emitting alarm device (e.g., a buzzer) so that a sound signal may be emitted when the semiconductor element is short-circuited; or a light emitting alarm device such as a light emitting diode LED and a sound emitting alarm device may be combined and applied to the alarm circuit so that both a light emitting signal and a sound signal may be emitted when the semiconductor element is short-circuited.

[0035] It should be understood that in Figure 1In the embodiment shown, the driving module 13 of the switch control unit 1 only includes the semiconductor element Q3. In another embodiment, the driving module 13 may include two or more semiconductor elements, which are connected in parallel with the semiconductor element Q3 and are connected with other elements in the circuit in the same way as the semiconductor element Q3 is connected with other elements in the circuit. When all semiconductor elements among the two or more semiconductor elements are disconnected, the operation mode of the remaining elements except the two or more semiconductor elements is the same as the operation mode when Q3 is disconnected when only Q3 is included. When one semiconductor element among the two or more semiconductor elements is short-circuited, the operation mode of the remaining elements except the two or more semiconductor elements is the same as the operation mode when Q3 is short-circuited when only Q3 is included. In addition, although Figure 1 In the embodiment shown, the semiconductor element Q2 is a triode and the semiconductor elements Q1, Q4, and Q5 are thyristors, and the semiconductor element Q3 is a MOS tube. However, it should be understood that the semiconductor elements involved in the present invention can be any one of thyristors, MOS tubes, or triodes. When the semiconductor element is a triode, the first electrode of the semiconductor element is the collector and the second electrode is the emitter; when the semiconductor element is a thyristor, the first electrode of the semiconductor element is the anode and the second electrode is the cathode; when the semiconductor element is a MOS tube, the first electrode of the semiconductor element is the drain and the second electrode is the source. In addition, in other embodiments, an element having the same function as the switch element S1 can be used as an auxiliary element of the auxiliary control circuit.

[0036] Figure 2 It is a circuit structure diagram of another embodiment of a linkage-controllable leakage protection device according to the contents of the present disclosure. Figure 2 The embodiment shown is Figure 1 The embodiments shown are substantially the same except that Figure 2 The light-emitting diode LED is removed, and Figure 2 R15 and Q5 in Figure 1 R15 and Q5 divide more current. When Q5 is turned on, the switch module will be disconnected, but no alarm signal will be generated.

[0037] The leakage protection device disclosed in the present invention can ensure that the circuit can be safely turned on and off by adopting an auxiliary element linked to the power switch. At the same time, it can promptly send out an alarm signal to remind the user to replace the product when the control element fails or is damaged, thereby better protecting personal or property safety.

[0038] Therefore, although the present invention is described with reference to specific examples, wherein these specific examples are intended to be illustrative only and not limiting of the present invention, it is obvious to those skilled in the art that the disclosed embodiments may be changed, added or deleted without departing from the spirit and scope of the present invention.

Claims

1. A linkage controllable leakage protection device, characterized in that: include: A leakage detection unit, used to detect whether there is a leakage fault signal at the output end of the power supply line; A self-checking unit, used for periodically generating a self-checking pulse signal simulating the leakage fault signal to detect whether the leakage detection unit fails. When the leakage detection unit fails, the self-checking unit sends a self-checking fault signal; and A switch control unit, used to control the action of the switch module between the input end and the output end of the power supply line, thereby controlling the power connection between the input end and the output end of the power supply line, the switch control unit comprising: a relay module, the relay module being coupled to the switch module; an auxiliary element, the auxiliary element being coupled to the relay module and the switch module and being configured to be closed or opened simultaneously with the switch module; a driving module, comprising at least one semiconductor element, wherein the at least one semiconductor element is coupled to the relay module, the auxiliary element, and the leakage detection unit and / or the self-test unit, Wherein, the driving module is configured to turn on the at least one semiconductor element when detecting the leakage fault signal and / or the self-test fault signal, thereby causing the relay module to lose power, thereby causing the switch module to disconnect the power connection and disconnect the auxiliary element, and further causing the at least one semiconductor element to be cut off; and the driving module is also configured to cause the relay module to lose power when detecting that the at least one semiconductor element is short-circuited, thereby causing the switch module to disconnect the power connection and disconnect the auxiliary element.

2. The leakage protection device according to claim 1, characterized in that: The leakage protection device also includes an alarm module, which is configured to be turned on and send an alarm signal in response to the detected leakage fault signal and / or the self-test fault signal or the self-test pulse signal when it is detected that all semiconductor elements of the at least one semiconductor element are broken.

3. The leakage protection device according to claim 2, characterized in that: The alarm module at least includes an alarm device and a first semiconductor element, the alarm device is connected in series with the first semiconductor element, and the control electrode of the first semiconductor element is coupled to the leakage detection unit and / or the self-test unit, and the alarm signal is generated by the alarm device.

4. The leakage protection device according to claim 3, characterized in that: The alarm device includes a light emitting device and / or a sound emitting device, wherein the light emitting device is used to generate a light signal, and the sound emitting device is used to generate a sound signal.

5. The leakage protection device according to claim 3, characterized in that: The first semiconductor element is any one of a thyristor, a MOS tube or a triode.

6. The leakage protection device according to claim 1, characterized in that: The auxiliary element is a switching element.

7. The leakage protection device according to claim 1, characterized in that: The switch control unit also includes a relay starting module and a relay holding module. The relay module includes a first coil and a second coil. The relay starting module is connected to the first coil and is used to energize the first coil to enable the switch module to be attracted and close the auxiliary element. The relay holding module is connected to the second coil and is used to energize the second coil when the auxiliary element is closed, so that the switch module remains attracted. When the auxiliary element is disconnected, the second coil is de-energized to disconnect the switch module.

8. The leakage protection device according to claim 1, characterized in that: The semiconductor element is any one of a thyristor, a MOS tube or a triode.

9. A leakage protection device capable of alarming, characterized in that: include: A leakage detection unit, used to detect whether there is a leakage fault signal at the output end of the power supply line; A self-checking unit, used for periodically generating a self-checking pulse signal simulating the leakage fault signal to detect whether the leakage detection unit fails. When the leakage detection unit fails, the self-checking unit sends a self-checking fault signal; and A switch control unit, used to control the action of the switch module between the input end and the output end of the power supply line, thereby controlling the power connection between the input end and the output end of the power supply line, the switch control unit comprising: a relay module, the relay module being coupled to the switch module; an auxiliary element, the auxiliary element being coupled to the relay module and the switch module and being configured to be closed or opened simultaneously with the switch module; a driving module, comprising at least one semiconductor element, coupled to the relay module, the auxiliary element, and the leakage detection unit and / or the self-test unit, Wherein, the driving module is configured to, when detecting the leakage fault signal and / or the self-test fault signal, turn on the at least one semiconductor element, thereby de-energizing the relay module, thereby causing the switch module to disconnect the power connection and disconnect the auxiliary element, and further turning off the at least one semiconductor element; and the driving module is further configured to, when detecting that the at least one semiconductor element is short-circuited, de-energize the relay module, thereby causing the switch module to disconnect the power connection and disconnect the auxiliary element; and An alarm module, the alarm module at least comprising: a first resistor; Alarm devices; and a first semiconductor element, The first resistor is connected in series with the alarm device and the first electrode of the first semiconductor element, and then connected in parallel with the at least one semiconductor element as a whole, and the control electrode of the first semiconductor element is coupled to the leakage detection unit and / or the self-test unit, and wherein, The alarm device is configured to be turned on and send out an alarm signal in response to the detected self-test pulse signal or the self-test fault signal and / or the leakage fault signal when it is detected that all semiconductor elements in the at least one semiconductor element are broken.

10. The leakage protection device according to claim 9, characterized in that: The alarm device includes a light emitting device and / or a sound emitting device, wherein the light emitting device is used to generate a light signal, and the sound emitting device is used to generate a sound signal.

11. The leakage protection device according to claim 9, characterized in that: The auxiliary element is a switching element.

12. The leakage protection device according to claim 9, characterized in that: The switch control unit also includes a relay starting module and a relay holding module. The relay module includes a first coil and a second coil. The relay starting module is connected to the first coil and is used to energize the first coil to enable the switch module to be attracted and close the auxiliary element. The relay holding module is connected to the second coil and is used to energize the second coil when the auxiliary element is closed, so that the switch module remains attracted. When the auxiliary element is disconnected, the second coil is de-energized to disconnect the switch module.

13. The leakage protection device according to claim 9, characterized in that: The at least one semiconductor element and / or the first semiconductor element is any one of a thyristor, a MOS tube or a triode.

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