AC power supply link rapid cut-off circuit

Abstract

The utility model relates to an AC power supply link rapid cut-off circuit, which is arranged between an AC source and a load Zo and comprises a first switch module circuit M1, a second switch module circuit M2 and an AC source phase L. The first switch module circuit M1, the load Zo and an AC source phase N are sequentially connected in series to form a main loop. One end of the second switch module circuit M2 is connected with a common node of the first switch module circuit M1 and the load Zo, and the other end of the second switch module circuit M2 is connected with an N phase of the alternating current source to form a protection circuit; the first switch module circuit M1 is used for switching the on-off state of a main loop according to a first control signal; and the second switch module circuit M2 is used for switching the on-off state of the second switch module circuit M2 according to the second control signal and the voltage at the two ends of the load Zo. According to the utility model, the switching efficiency and safety of the AC power supply link are improved.

Description

Technical Field

[0001] This utility model relates to the field of power supply and distribution technology, specifically to a fast disconnection circuit for AC power supply links. Background Technology

[0002] A power supply and distribution system is a power network system composed of various power distribution equipment (or components) and facilities that transforms voltage and directly distributes electrical energy to end users. In existing AC power supply systems, when a rapid power outage is needed to protect electrical equipment or for maintenance, a fast-response disconnection mechanism is often lacking, which may lead to equipment damage or inefficient maintenance. At the moment of rapid power failure, the induced voltage in some loads is high, which may also break down or damage components in the circuit.

[0003] Therefore, it is necessary to develop a solution that can quickly and safely disconnect the power supply link. Utility Model Content

[0004] Based on the above description, this utility model provides a fast disconnection circuit for AC power supply links to improve the switching efficiency and safety of AC power supply links.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A fast disconnection circuit for AC power supply link is set between AC source and load Zo, including a first switch module circuit M1 and a second switch module circuit M2. The L phase of AC source, the first switch module circuit M1, the load Zo and the N phase of AC source are connected in series to form a main circuit. One end of the second switch module circuit M2 is connected to the common node of the first switch module circuit M1 and the load Zo, and the other end of the second switch module circuit M2 is connected to the N phase of AC source to form a protection circuit.

[0006] The first switch module circuit M1 is used to switch the on / off state of the main circuit according to the first control signal;

[0007] The second switching module circuit M2 is used to switch the on / off state of the second switching module circuit M2 according to the second control signal and the voltage across the load Zo.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, when the first switch module circuit M1 is on, the second switch module circuit M2 is off;

[0010] When the first switch module circuit M1 is open, if the voltage across the load Zo exceeds the voltage threshold, the second switch module circuit M2 is turned on.

[0011] Furthermore, it also includes a current monitoring module and a control module. The current monitoring module is used to monitor the main circuit current. The control module is used to output an overcurrent protection signal to control the first switch module circuit M1 to disconnect when the main circuit current is greater than the current threshold.

[0012] Furthermore, when the main circuit current value is greater than the current threshold, the control module is used to output an overcurrent protection signal to control the first switch module circuit M1 to disconnect for a preset time and then reconnect.

[0013] If the main circuit current value is still greater than the current threshold, the control module outputs an overcurrent protection signal again to control the first switch module circuit M1 to disconnect for a preset time and then reconnect.

[0014] This process repeats until the number of consecutive disconnections of the first switch module circuit M1 reaches a preset number. Then, the control module outputs a short-circuit protection signal to disconnect the first switch module circuit M1 and initiates a short-circuit warning signal.

[0015] Furthermore, the first switching module circuit M1 includes rectifier diodes D1~D4, a controllable switch Q1, and a spike absorption capacitor C1. The anode of rectifier diode D1 and the cathode of rectifier diode D2 are connected to the AC source L phase. The anode of rectifier diode D3 and the cathode of rectifier diode D4 are connected to one end of the load Zo. The cathodes of rectifier diode D1 and D3 are connected to the DC input terminal of the controllable switch Q1. The anodes of rectifier diode D2 and D4 are connected to the DC output terminal of the controllable switch Q1. The control terminal of the controllable switch Q1 is connected to the control module. The spike absorption capacitor C1 is connected in parallel with the controllable switch Q1.

[0016] Furthermore, the first switch module circuit M1 also includes a rectifier diode D5 and a discharge resistor R2. The anode of the rectifier diode D5 is connected to the DC input terminal of the controllable switch Q1, the cathode of the rectifier diode D5 is connected to the positive terminal of the peak absorption capacitor C1, the negative terminal of the peak absorption capacitor C1 is connected to the DC output terminal of the controllable switch Q1, and the discharge resistor R2 is connected in parallel with the rectifier diode D5.

[0017] Furthermore, the first switch module circuit M1 also includes a varistor R1, which is connected in parallel with the controllable switch Q1.

[0018] Furthermore, the second switch module circuit M2 includes rectifier diodes D6-D9, a controllable switch Q2, and a spike absorption capacitor C2. The anode of rectifier diode D6 and the cathode of rectifier diode D7 are connected to the N-phase of the AC source. The anode of rectifier diode D8 and the cathode of rectifier diode D9 are connected to one end of the load Zo. The cathodes of rectifier diodes D6 and D8 are connected to the DC input terminal of the controllable switch Q2. The anodes of rectifier diodes D7 and D9 are connected to the DC output terminal of the controllable switch Q2. The control terminal of the controllable switch Q2 is connected to the control module. The spike absorption capacitor C2 is connected in parallel with the controllable switch Q2.

[0019] Furthermore, the second switch module circuit M2 also includes a rectifier diode D10 and a discharge resistor R4. The anode of the rectifier diode D10 is connected to the DC input terminal of the controllable switch Q2, the cathode of the rectifier diode D10 is connected to the positive terminal of the peak absorption capacitor C2, the negative terminal of the peak absorption capacitor C2 is connected to the DC output terminal of the controllable switch Q2, and the discharge resistor R4 is connected in parallel with the rectifier diode D10.

[0020] Furthermore, the second switch module circuit M2 also includes a varistor R3, which is connected in parallel with the controllable switch Q2.

[0021] Compared with existing technologies, the technical solution of this application has the following beneficial technical effects: The present invention provides a fast AC power supply link disconnection circuit. A first switch module circuit M1 controls the on / off state of the AC circuit, while a second switch module circuit M2 automatically maintains current flow when the first switch module circuit M1 is disconnected. The two work together to achieve power supply and power-off control of the load. Specifically, the on / off state of the main circuit can be quickly switched via a first control signal to achieve fast AC power supply link disconnection. After disconnecting the AC power supply link, if the voltage in the main circuit is too high, the second switch module circuit M2 automatically connects to achieve automatic freewheeling protection, preventing damage to components in the circuit due to excessive voltage. The solution of this invention improves the efficiency and safety of fast AC power supply link disconnection. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a fast disconnection circuit for an AC power supply link provided in an embodiment of the present invention. Detailed Implementation

[0023] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0025] It is understood that spatial relation terms such as "below," "under," "below," "below," "above," "over," etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as "below" or "under" or "below" of other elements or features will be oriented "over" of other elements or features. Therefore, the exemplary terms "below" and "under" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0026] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0027] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0028] like Figure 1 As shown, this utility model provides a fast disconnection circuit for an AC power supply link, which is set between the AC source Vac and the load Zo. The fast disconnection circuit for an AC power supply link provided in this embodiment includes a first switch module circuit M1 and a second switch module circuit M2. The AC source L phase, the first switch module circuit M1, the load Zo, and the AC source N phase are connected in series to form a main circuit. One end of the second switch module circuit M2 is connected to the common node of the first switch module circuit M1 and the load Zo, and the other end of the second switch module circuit M2 is connected to the AC source N phase, forming a protection circuit.

[0029] The first switch module circuit M1 is used to switch the on / off state of the main circuit according to the first control signal;

[0030] The second switching module circuit M2 is used to switch the on / off state of the second switching module circuit M2 according to the second control signal and the voltage across the load Zo.

[0031] Understandably, during normal operation of the AC power supply link, the first control signal is used to control the connection between the AC source Vac and the load Zo, thereby controlling whether the load Zo is connected to the AC source Vac. When it is necessary to quickly disconnect the load Zo from the AC power supply link, the first control signal controls the first switching module circuit M1 to disconnect rapidly. If the voltage across the load Zo is too high when the first switching module circuit M1 is disconnected, the high voltage across the load Zo provides a driving voltage to the second switching module circuit M2. At the same time, the second control signal is active, and the two work together to drive the second switching module circuit M2 to connect and form a circuit. The second switching module circuit M2 acts as an automatic freewheeling circuit, releasing the high voltage across the load Zo and protecting the components in the circuit.

[0032] The solution of this utility model improves the efficiency and safety of rapid disconnection of AC power supply links.

[0033] Based on the above technical solution, this embodiment can be further improved as follows.

[0034] In one possible embodiment, the first switch module circuit M1 is used to control the on / off control of the AC power supply link. When the first switch module circuit M1 is on, that is, when the AC power supply link is connected to the load Zo to form a path, the second control signal is invalid, and the second switch module circuit M2 is off, which does not affect the operation of the main circuit.

[0035] At the instant the first switch module circuit M1 is disconnected, the second control signal is made valid. If the voltage across the load Zo does not exceed the voltage threshold, the AC power supply link is normally disconnected from the load Zo, and the second switch module circuit M2 remains disconnected. If the voltage across the load Zo exceeds the voltage threshold, posing a safety hazard, the high voltage across the load Zo serves as the driving source, driving the second switch module circuit M2 to connect, achieving an automatic freewheeling effect and discharging voltage from the load Zo.

[0036] In one possible embodiment, the AC power supply link quick disconnection circuit further includes a current monitoring module (not shown) and a control module (not shown) electrically connected to each other. The current monitoring module is used to monitor the main circuit current, for example, the current passing through the first switching module circuit M1. The control module is used to compare the monitored main circuit current with a current threshold. If the main circuit current is not greater than the current threshold, no action is taken; if the main circuit current is greater than the current threshold, an overcurrent protection signal is output to control the first switching module circuit M1 to disconnect.

[0037] It is understood that the control module can employ programmable logic devices, such as FPGAs or CPLDs. These devices can be programmed with software to implement more flexible and customizable control logic, including complex control algorithms and functions such as timing control, fault detection, and automatic reset. In this embodiment, overcurrent protection is achieved by monitoring the current passing through the first switching module circuit M1 to prevent damage to components in the circuit from large currents under abnormal conditions.

[0038] In one possible embodiment, when the main circuit current value is greater than the current threshold, the control module is used to output an overcurrent protection signal to control the first switch module circuit M1 to disconnect for a preset time and then reconnect.

[0039] If the main circuit current value is still greater than the current threshold, the control module outputs an overcurrent protection signal again to control the first switch module circuit M1 to disconnect for a preset time and then reconnect.

[0040] This process repeats until the number of consecutive disconnections of the first switch module circuit M1 reaches a preset number. Then, the control module outputs a short-circuit protection signal to disconnect the first switch module circuit M1 and initiates a short-circuit warning signal.

[0041] It is understandable that excessive main circuit current could be caused by pulse current / spiking current at the moment the circuit is turned on, or it could be caused by circuit abnormalities (such as short circuit faults). In this embodiment, to protect the switching elements in the first switching module circuit M1 from the spike current generated when a capacitive load is powered on, the AC fast-switching board is designed with an intelligent shutdown mechanism. When excessive current is detected in the main circuit, the first switching module circuit M1 is disconnected multiple times for short periods to distinguish between excessive current caused by pulse current / spiking current and excessive current caused by short circuit, thus achieving overcurrent protection of the circuit. For example, in a specific implementation scenario, the following steps are used to achieve this:

[0042] 1. Peak Current Detection: The current detection circuit (current monitoring module) built into the AC fast switch device monitors the current flowing through the switching elements in the first switching module circuit M1. Once the detected current exceeds the set current threshold, the protection mechanism will be triggered, and the MOSFET will be quickly turned off until the capacitor is fully charged, so as to reduce the impact of peak current on the switching elements (such as MOSFETs) in the first switching module circuit M1.

[0043] 2. Differentiating Between Peak Current and Short Circuit Faults: To differentiate between peak current and short circuit faults, the AC fast-switching device implements a specific protection strategy. The switching element (MOSFET) in the first switching module circuit M1 is limited to 200 turns, and after each turn-off, it waits 800 microseconds before being turned back on. If the current continues to exceed the threshold, this process will repeat up to 200 times.

[0044] 3. Complete shutdown mechanism: If the main circuit current still exceeds the current threshold after 200 shutdown cycles, the AC fast-switching device will classify the current situation as a continuous short-circuit fault, rather than a momentary spike current. In this case, the MOSFET will not conduct again after the last shutdown to prevent permanent damage caused by prolonged overcurrent.

[0045] In one possible embodiment, such as Figure 1 As shown, the first switching module circuit M1 includes rectifier diodes D1~D4, a controllable switch Q1, and a spike absorption capacitor C1. The anode of rectifier diode D1 and the cathode of rectifier diode D2 are connected to the AC source phase L. The anode of rectifier diode D3 and the cathode of rectifier diode D4 are connected to one end of the load Zo. The cathodes of rectifier diode D1 and D3 are connected to the DC input terminal of the controllable switch Q1. The anodes of rectifier diode D2 and D4 are connected to the DC output terminal of the controllable switch Q1. The control terminal of the controllable switch Q1 is connected to the control module. The spike absorption capacitor C1 is connected in parallel with the controllable switch Q1.

[0046] It is understandable that the controllable switch Q1 can be implemented using a MOSFET or an IGBT. In this embodiment, the AC circuit is indirectly controlled by controlling the switching state of the DC controllable switch Q1. Rectifier diodes D1-D4 form a bidirectional rectifier module, which rectifies the AC power from the AC link into DC power, thus serving as the driving power supply for the controllable switch Q1. When the first control signal input to the control terminal of the controllable switch Q1 is valid, the controllable switch Q1 conducts, making the main circuit a closed circuit and providing operating power to the load Zo. The first switch module circuit M1 can control the main circuit through the first control signal provided by an external optical fiber and a 220V AC power supply. When the first control signal provided by the optical fiber is activated and the AC power supply Vac is present, the first switch module circuit M1 automatically conducts; when the optical fiber signal is turned off, the first switch module circuit M1 automatically disconnects.

[0047] For example, during the positive half-cycle, the current flows sequentially through the L phase of the AC source, rectifier D1, controllable switch Q1, and rectifier D4, then flows back to the N phase of the AC source through the load Zo. During the negative half-cycle, the current reverses direction, flowing sequentially through the N phase of the AC source, the load Zo, rectifier D3, controllable switch Q1, and rectifier D2, then flowing back to the L phase of the AC source. When controllable switch Q1 is on, the voltage in the main circuit suddenly changes, forming a voltage spike. The spike absorption capacitor C1 absorbs charge and stores energy; when controllable switch Q1 is off, the spike absorption capacitor C1 releases charge. The combination of the two half-cycle phases effectively reduces the amplitude of the voltage spike, preventing damage to other components in the circuit.

[0048] In one possible embodiment, such as Figure 1 As shown, the first switch module circuit M1 also includes a rectifier diode D5 and a discharge resistor R2. The anode of the rectifier diode D5 is connected to the DC input terminal of the controllable switch Q1, the cathode of the rectifier diode D5 is connected to the positive terminal of the peak absorption capacitor C1, the negative terminal of the peak absorption capacitor C1 is connected to the DC output terminal of the controllable switch Q1, and the discharge resistor R2 is connected in parallel with the rectifier diode D5.

[0049] It is understandable that the rectifier diode D5 and the discharge resistor R2 work together with the peak absorption capacitor C1. During the charging process of the peak absorption capacitor C1, the rectifier diode D5 acts as a current guide / current reverse current preventer, ensuring that the peak absorption capacitor C1 successfully completes the peak absorption process. During the discharging process of the peak absorption capacitor C1, the discharge resistor R2 releases the absorbed energy, lowering the voltage of the peak absorption capacitor C1 to facilitate absorption before the next leakage inductance peak. The capacitance of the peak absorption capacitor C1 and the discharge resistor R2 need to be properly matched; the capacitance should be sufficient to absorb the leakage inductance peak voltage without exceeding the withstand voltage of the controllable switch Q1.

[0050] In one possible embodiment, such as Figure 1 As shown, the first switch module circuit M1 also includes a varistor R1, which is connected in parallel with the controllable switch Q1.

[0051] Understandably, the varistor R1 provides overvoltage protection for the first switching module circuit M1, clamping the DC voltage across the controllable switch Q1's switching channel to a preset value, thereby protecting subsequent circuits. Specifically, when the voltage applied across the varistor R1 exceeds a certain value, the resistance of the varistor R1 drops rapidly to conduct a large current, protecting the downstream circuit; when it is below its operating voltage, the resistance of the varistor R1 is extremely high, equivalent to an open circuit, and does not affect the operation of the downstream circuit. Using the varistor R1 can solve the problem of abnormally high voltage fluctuations across the controllable switch Q1's switching channel.

[0052] In one possible embodiment, the circuit structure of the second switching module circuit M2 is similar to that of the first switching module circuit M1. For example... Figure 1 As shown, the second switch module circuit M2 includes rectifier diodes D6-D9, a controllable switch Q2, and a spike absorption capacitor C2. The anode of rectifier diode D6 and the cathode of rectifier diode D7 are connected to the N-phase of the AC source. The anode of rectifier diode D8 and the cathode of rectifier diode D9 are connected to one end of the load Zo. The cathodes of rectifier diodes D6 and D8 are connected to the DC input terminal of the controllable switch Q2. The anodes of rectifier diodes D7 and D9 are connected to the DC output terminal of the controllable switch Q2. The control terminal of the controllable switch Q2 is connected to the control module. The spike absorption capacitor C2 is connected in parallel with the controllable switch Q2.

[0053] It is understandable that the controllable switch Q2 can be implemented using a MOSFET or an IGBT. In this embodiment, overvoltage protection of the circuit is achieved by controlling the switching state of the DC controllable switch Q2. Rectifier diodes D6-D9 combine to form a rectifier module, which rectifies the voltage from the common node of the first switch module circuit M1 and the load Zo, thus serving as the driving power supply for the controllable switch Q2. When the second control signal input to the control terminal of the controllable switch Q2 is valid, the controllable switch Q2 conducts, making the overvoltage protection circuit a circuit and discharging voltage from the load Zo. Similar to the first switch module circuit M1, the second switch module circuit M2 can control the main circuit through the second control signal provided by an external optical fiber and the high voltage across the load Zo. When the second control signal provided by the optical fiber is activated and the high voltage across the load Zo reaches a preset value, the controllable switch Q2 automatically conducts; when the optical fiber signal is turned off, the controllable switch Q2 automatically disconnects.

[0054] As a further improvement, the second switch module circuit M2 also includes a rectifier diode D10 and a discharge resistor R4. The anode of the rectifier diode D10 is connected to the DC input terminal of the controllable switch Q2, the cathode of the rectifier diode D10 is connected to the positive terminal of the peak absorption capacitor C2, the negative terminal of the peak absorption capacitor C2 is connected to the DC output terminal of the controllable switch Q2, and the discharge resistor R4 is connected in parallel with the rectifier diode D10.

[0055] Referring to the first switch module circuit M1, the rectifier diode D10 and the discharge resistor R4 work in conjunction with the spike absorption capacitor C2. During the charging process of the spike absorption capacitor C2, the rectifier diode D10 acts as a current guide / current reverse protection mechanism, ensuring that the spike absorption capacitor C2 successfully completes the spike absorption process. During the discharging process of the spike absorption capacitor C2, the discharge resistor R4 discharges the absorbed energy, lowering the voltage of the spike absorption capacitor C2 to facilitate absorption before the next leakage inductance spike. The capacitance of the spike absorption capacitor C2 and the discharge resistor R4 need to be appropriately matched; the capacitance should be sufficient to absorb the leakage inductance spike voltage without exceeding the withstand voltage of the controllable switch Q2.

[0056] In one possible embodiment, such as Figure 1 As shown, the second switch module circuit M2 also includes a varistor R3, which is connected in parallel with the controllable switch Q2.

[0057] Understandably, varistor R3 provides overvoltage protection for the second switching module circuit M2, clamping the DC voltage across the controllable switch Q2's switching channel to a preset value, thereby protecting subsequent circuits. Similarly, when the voltage applied across varistor R3 exceeds a certain value, its resistance drops rapidly to conduct a large current, protecting the downstream circuit; when it falls below its operating voltage, varistor R3's resistance is extremely high, effectively an open circuit, and does not affect the operation of the downstream circuit. Using varistor R3 can solve the problem of abnormally high voltage fluctuations across the controllable switch Q2's switching channel.

[0058] The AC power supply link quick disconnection circuit provided by this utility model has the following advantages:

[0059] 1. Fast response: The AC switch has a response time of no more than 10 microseconds, enabling it to quickly cut off and restore AC power.

[0060] 2. High reliability: The use of controllable switching devices (such as IGBTs) and automatic freewheeling protection in the circuit improves the reliability and withstand voltage of the switch;

[0061] 3. High safety: The switch is protected from overvoltage damage through a varistor and an automatic overvoltage conduction mechanism;

[0062] 4. Flexibility: The control logic is integrated into the programmable logic device, making the control logic more flexible and customizable;

[0063] 5. Protection Mechanism: Intelligent shutdown mechanism and short-circuit fault protection strategy effectively protect switching devices and downstream circuits from damage.

[0064] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An AC supply link quick-break circuit, arranged between an AC source and a load Zo, characterized in that, The first switch module circuit M1 and the second switch module circuit M2 are included, an AC source L phase, the first switch module circuit M1, a load Zo and an AC source N phase are sequentially connected in series to form a main circuit, one end of the second switch module circuit M2 is connected to a common node of the first switch module circuit M1 and the load Zo, and the other end of the second switch module circuit M2 is connected to the AC source N phase, thereby forming a protection circuit; The first switch module circuit M1 is used for switching on and off states of the main circuit according to a first control signal. The second switch module circuit M2 is used for switching on and off states of the second switch module circuit M2 according to a second control signal and a voltage across the load Zo.

2. An AC supply link quick disconnect circuit according to claim 1, wherein, In the on state of the first switch module circuit M1, the second switch module circuit M2 is off. In the off state of the first switch module circuit M1, when the voltage across the load Zo exceeds a voltage threshold, the second switch module circuit M2 is on.

3. An AC supply link quick disconnect circuit according to claim 1 or 2, wherein, The current monitoring module is further used for monitoring a main circuit current, and the control module is used for outputting an overcurrent protection signal to control the first switch module circuit M1 to be off when the main circuit current is greater than a current threshold.

4. An AC supply link quick disconnect circuit according to claim 3, wherein, The control module is used for outputting an overcurrent protection signal to control the first switch module circuit M1 to be off for a preset time length when the main circuit current value is greater than the current threshold. The control module is further used for outputting a short-circuit protection signal to lock the off state of the first switch module circuit M1 when the number of continuous off times of the overcurrent protection reaches a preset number.

5. An AC supply link quick disconnect circuit according to claim 3, wherein, The first switch module circuit M1 includes rectifier tubes D1-D4, a controllable switch Q1 and a spike absorption capacitor C1, an anode of the rectifier tube D1 and a cathode of the rectifier tube D2 are commonly connected to the AC source L phase, an anode of the rectifier tube D3 and a cathode of the rectifier tube D4 are commonly connected to one end of the load Zo, a cathode of the rectifier tube D1 and a cathode of the rectifier tube D3 are commonly connected to a direct current input end of the controllable switch Q1, an anode of the rectifier tube D2 and an anode of the rectifier tube D4 are commonly connected to a direct current output end of the controllable switch Q1, a control end of the controllable switch Q1 is connected to the control module, and the spike absorption capacitor C1 is connected in parallel to the controllable switch Q1.

6. An AC supply link quick disconnect circuit according to claim 5, wherein, The first switch module circuit M1 further includes a rectifier tube D5 and a discharge resistor R2, an anode of the rectifier tube D5 is connected to the direct current input end of the controllable switch Q1, a cathode of the rectifier tube D5 is connected to a positive electrode of the spike absorption capacitor C1, a negative electrode of the spike absorption capacitor C1 is connected to the direct current output end of the controllable switch Q1, and the discharge resistor R2 is arranged in parallel to the rectifier tube D5.

7. An AC supply link quick disconnect circuit according to claim 6, wherein, The first switch module circuit M1 further includes a pressure-sensitive resistor R1, and the pressure-sensitive resistor R1 is connected in parallel to the controllable switch Q1.

8. The AC supply link quick disconnect circuit according to any one of claims 4, 5, 6, 7, wherein, The second switch module circuit M2 includes rectifier tubes D6-D9, a controllable switch Q2, and a spike absorption capacitor C2. The anode of the rectifier tube D6 and the cathode of the rectifier tube D7 are commonly connected to an AC source N phase. The anode of the rectifier tube D8 and the cathode of the rectifier tube D9 are commonly connected to one end of a load Zo. The cathode of the rectifier tube D6 and the cathode of the rectifier tube D8 are commonly connected to a DC input end of the controllable switch Q2. The anode of the rectifier tube D7 and the anode of the rectifier tube D9 are commonly connected to a DC output end of the controllable switch Q2. A control end of the controllable switch Q2 is connected to the control module. The spike absorption capacitor C2 is connected in parallel with the controllable switch Q2.

9. An AC supply link quick disconnect circuit according to claim 8, wherein, The second switch module circuit M2 further includes a rectifier tube D10 and a discharge resistor R4. The anode of the rectifier tube D10 is connected to the DC input end of the controllable switch Q2. The cathode of the rectifier tube D10 is connected to the positive electrode of the spike absorption capacitor C2. The negative electrode of the spike absorption capacitor C2 is connected to the DC output end of the controllable switch Q2. The discharge resistor R4 is arranged in parallel with the rectifier tube D10.

10. The AC supply link quick disconnect circuit of claim 9, wherein, The second switch module circuit M2 further includes a voltage-dependent resistor R3. The voltage-dependent resistor R3 is connected in parallel with the controllable switch Q2.

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