Charging pile emergency shutdown protection device and control method thereof, and charging pile

Abstract

The application discloses a charging pile emergency shutdown protection device and a control method thereof and a charging pile. The protection device comprises an output circuit, an auxiliary shutdown circuit and a control circuit. The output circuit is connected in series between a power module and a load of the charging pile. The auxiliary shutdown circuit is connected in parallel with the output circuit. The control circuit is connected with the output circuit and the auxiliary shutdown circuit respectively. The control circuit is configured to turn on the auxiliary shutdown circuit in response to an emergency shutdown signal of the charging pile, and disconnect the output circuit under the condition that the auxiliary shutdown circuit is turned on, so that the charging current in the output circuit is transferred to the auxiliary shutdown circuit. The control circuit is further configured to disconnect the auxiliary shutdown circuit under the condition that the working current of the auxiliary shutdown circuit is greater than or equal to a current threshold. The application can reduce the overrated current disconnecting risk of the output circuit under the emergency shutdown state, prolong the service life of the charging pile, and improve the safety and reliability of the charging pile.

Description

Technical Field

[0001] This application relates to the field of charging system technology, and in particular to an emergency shutdown protection device for a charging pile and its control method, as well as a charging pile. Background Technology

[0002] With the increasing popularity of electric vehicles and the increase in power battery capacity, users' demands for charging time are constantly rising. In order to shorten charging time, the charging current output by DC charging piles is constantly increasing. In high-current charging scenarios, the charging current output by charging piles can reach hundreds or even thousands of amps.

[0003] In the event of an emergency shutdown of a charging station, the DC contactor disconnecting with a large current may cause the contactor to disconnect due to over-rated current, affecting the service life of the contactor and reducing the safety and reliability of the charging station. Summary of the Invention

[0004] This application provides an emergency shutdown protection device and control method for a charging pile, which can reduce the risk of sticking caused by overcurrent disconnection during emergency shutdown of the charging pile, extend the service life of the charging pile, and improve the safety and reliability of the charging pile.

[0005] To achieve the above objectives, according to a first aspect of this application, an emergency shutdown protection device for a charging pile is provided, comprising: an output circuit, an auxiliary shutdown circuit, and a control circuit. The output circuit is connected in series between the power module and the load of the charging pile, the auxiliary shutdown circuit is connected in parallel with the output circuit, and the control circuit is connected to both the output circuit and the auxiliary shutdown circuit. The control circuit is configured to: in response to an emergency shutdown signal from the charging pile, activate the auxiliary shutdown circuit and, when the auxiliary shutdown circuit is activated, disconnect the output circuit to transfer the charging current in the output circuit to the auxiliary shutdown circuit; and, when the operating current of the auxiliary shutdown circuit is greater than or equal to a current threshold, disconnect the auxiliary shutdown circuit.

[0006] Optionally, the auxiliary shutdown circuit includes: a semiconductor switch, a first terminal of which is connected to the power module, a second terminal of which is connected to the load, and a control terminal of which is connected to the control circuit; wherein the control circuit is configured to: in response to the emergency stop signal, send a first turn-on signal to the semiconductor switch to turn on the auxiliary shutdown circuit; and, if the operating current of the auxiliary shutdown circuit is greater than or equal to a current threshold, send a first turn-off signal to the semiconductor switch to turn off the auxiliary shutdown circuit.

[0007] Optionally, the auxiliary shutdown circuit further includes a current sensor connected in series with the semiconductor switch, the current sensor also being connected to the control circuit; wherein the current sensor is configured to: collect the operating current of the auxiliary shutdown circuit and transmit the collected current sample value to the control circuit.

[0008] Optionally, the control circuit includes: a controller configured to output a shutdown drive signal based on the emergency shutdown signal; an overcurrent trigger module, the input of which is connected to the current sensor, the overcurrent trigger module being configured to output a first signal when the current sample value is greater than or equal to a current threshold; wherein the first signal is used to characterize the overcurrent of the operating current of the auxiliary shutdown circuit (200), which requires triggering the semiconductor switch (210) to shut down; and a logic shutdown module, the first input of which receives the shutdown drive signal, the second input of which receives the first signal, the logic shutdown module being configured to output a first shutdown signal based on the shutdown drive signal and the first signal.

[0009] Optionally, the overcurrent trigger module is connected to the controller, and the overcurrent trigger module is further configured to: receive a reset signal sent by the controller and output a second signal; wherein the second signal is used to characterize that the operating current of the auxiliary shutdown circuit (200) is normal and there is no need to trigger the semiconductor switch (210) to shut down.

[0010] Optionally, the control circuit further includes: an isolation drive module, the input terminal of which is connected to the logic shutdown module, and the output terminal of which is connected to the semiconductor switch.

[0011] Optionally, the auxiliary shutdown circuit further includes: an auxiliary contactor connected in series with the semiconductor switch, the control terminal of the auxiliary contactor being connected to the control circuit; wherein the control circuit is configured to: send a second conduction signal to the auxiliary contactor upon receiving a power-on signal from the charging pile; or, send a second shutdown signal to the auxiliary contactor after the semiconductor switch is turned off based on the first shutdown signal.

[0012] Optionally, the output circuit includes at least two parallel output contactors, with a first terminal of each output contactor connected to the power module, a second terminal of each output contactor connected to the load, and a control terminal of each output contactor connected to the control circuit; wherein the control circuit is configured to: when the charging pile is in a charging state, simultaneously send a third conduction signal to each output contactor to allow the charging current of the power module to be transmitted to the load through each output contactor; and when the auxiliary shutdown circuit responds to the emergency stop signal and conducts, simultaneously send a third shutdown signal to each output contactor to disconnect the output circuit.

[0013] According to a second aspect of this application, a control method for an emergency shutdown protection device for a charging pile is also proposed. The protection device includes an output circuit and an auxiliary shutdown circuit. The output circuit is connected in series between the power module and the load of the charging pile, and the auxiliary shutdown circuit is connected in parallel with the output circuit. The method includes: responding to an emergency shutdown signal of the charging pile, turning on the auxiliary shutdown circuit, and turning off the output circuit while the auxiliary shutdown circuit is on, so that the charging current in the output circuit is transferred to the auxiliary shutdown circuit; and turning off the auxiliary shutdown circuit when the operating current of the auxiliary shutdown circuit is greater than or equal to a current threshold.

[0014] According to a third aspect of this application, a charging pile is also provided, comprising: a power module, and an emergency shutdown protection device for the charging pile as described in the first aspect above, wherein the power module is connected to a load through the protection device.

[0015] In summary, the emergency shutdown protection device for charging piles of this application includes: an output circuit, an auxiliary shutdown circuit, and a control circuit. The output circuit is connected in series between the power module and the load of the charging pile. The auxiliary shutdown circuit is connected in parallel with the output circuit. The control circuit is connected to both the output circuit and the auxiliary shutdown circuit. The control circuit is configured to: respond to an emergency shutdown signal from the charging pile, activate the auxiliary shutdown circuit, and disconnect the output circuit while the auxiliary shutdown circuit is activated, so that the charging current in the output circuit is transferred to the auxiliary shutdown circuit; and disconnect the auxiliary shutdown circuit when the operating current of the auxiliary shutdown circuit is greater than or equal to a current threshold. The protection device of this application includes an auxiliary shutdown circuit connected in parallel with the output circuit, which can, in the event of an emergency shutdown of the charging pile, first activate the auxiliary shutdown circuit and then disconnect the output circuit, so that the charging current in the output circuit is transferred to the auxiliary shutdown circuit, and disconnect the auxiliary shutdown circuit when the operating current of the auxiliary shutdown circuit is greater than or equal to a current threshold. This application reduces the risk of contact erosion, welding, or adhesion caused by large current or over-rated current disconnection during emergency shutdown by transferring the charging current to the auxiliary shutdown circuit, which then performs the shutdown operation. This extends the service life of the charging pile and improves its safety and reliability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples of this application; those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0017] Figure 1 A schematic diagram of an emergency shutdown protection device for a charging pile is provided as an example in this application; Figure 2 A schematic diagram of another emergency shutdown protection device for a charging pile provided as an example in this application; Figure 3 A schematic diagram of another emergency shutdown protection device for a charging pile provided as an example in this application; Figure 4 A schematic diagram of another emergency shutdown protection device for a charging pile provided as an example in this application; Figure 5 A schematic flowchart of a control method for an emergency shutdown protection device for a charging pile is provided as an example in this application; Figure 6 This is a flowchart illustrating a charging pile control method provided as an example in this application.

[0018] Explanation of icon numbers: 100. Output circuit; 110. Output contactor; 200. Auxiliary shutdown circuit; 210. Semiconductor switch; 220. Current sensor; 230. Auxiliary contactor; 300. Control circuit; 310. Controller; 320. Overcurrent trigger module; 330. Logic shutdown module; 340. Isolation drive module; 400. Power module; 500. Load. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0020] With the increasing popularity of electric vehicles and the growth in battery capacity, users are demanding faster charging times. To shorten charging time, the charging current output by DC charging piles is constantly increasing. In high-current charging scenarios, the charging current output by the charging pile can reach hundreds or even thousands of amps. This high-current charging not only makes selecting the right DC contactor for the charging pile's power output circuit difficult, but also causes the contactor to disconnect due to exceeding its rated current in emergency shutdown situations, affecting the contactor's lifespan and the safety and reliability of the charging pile.

[0021] In view of this, the present application provides an emergency shutdown protection device and control method for a charging pile, as well as a charging pile, which can reduce the risk of overcurrent disconnection of the contactor under emergency shutdown conditions, improve the service life of the contactor, and enhance the safety and reliability of the charging pile.

[0022] In a first aspect, embodiments of this application propose an emergency shutdown protection device for charging piles.

[0023] Please see Figure 1 , Figure 1 This is a schematic diagram of an emergency shutdown protection device for a charging pile, provided as an embodiment of this application. Figure 1As shown, the charging pile emergency shutdown protection device includes: an output circuit 100, an auxiliary shutdown circuit 200, and a control circuit 300. The output circuit 100 is connected in series between the power module 400 and the load 500 of the charging pile. The auxiliary shutdown circuit 200 is connected in parallel with the output circuit 100. The control circuit is connected to both the output circuit 100 and the auxiliary shutdown circuit 200. The control circuit 300 is configured to: in response to an emergency shutdown signal from the charging pile, turn on the auxiliary shutdown circuit 200 and, while the auxiliary shutdown circuit 200 is on, turn off the output circuit 100 so that the charging current in the output circuit 100 is transferred to the auxiliary shutdown circuit 200; and, if the operating current of the auxiliary shutdown circuit 200 is greater than or equal to a current threshold, turn off the auxiliary shutdown circuit 200.

[0024] Power module 400 is a module in the charging pile used to output charging power. Power module 400 converts the input AC power to DC power and outputs it to load 500 according to the charging demand of load 500. Power module 400 includes one or more power units connected in parallel, each capable of power conversion. In high-current charging scenarios, power module 400 typically uses multiple power units connected in parallel to output a large charging current. The output power of each power unit can be the same or different.

[0025] Please continue reading. Figure 1 The output circuit 100 in the protection device is connected in series between the power module 400 and the load 500, and is used to transmit the charging current output by the power module 400 to the load 500 to realize the charging operation of the load 500. The output circuit 100 is connected to the control circuit 300 and is turned on or off under the control of the control circuit 300. For example, the output circuit 100 includes a DC contactor, and the control circuit 300 realizes the on / off control of the output circuit 100 by controlling the on and off of the DC contactor.

[0026] The auxiliary shutdown circuit 200 is connected in parallel with the output circuit 100 and also connected to the control circuit 300, and is turned on or off under the control of the control circuit 300. For example, the auxiliary shutdown circuit 200 includes a semiconductor switching device, which, due to its fast response speed, can be used for rapid current interruption in emergency shutdown conditions.

[0027] An emergency stop signal is a control signal generated by a charging pile when a safety risk or abnormal condition is detected. Unlike the stop signal at the end of normal charging, the emergency stop signal, in addition to indicating a stop, also triggers protective actions on the charging pile. For example, the emergency stop signal can be triggered in cases of manual emergency stop, abnormal load, output overcurrent, output short circuit, insulation abnormality, overheating of the charging cable, power module 400 failure, communication abnormality, etc. The emergency stop signal can be generated by the charging pile's main control unit, terminal controller, power cabinet controller, etc., and sent to the control circuit 300.

[0028] In this embodiment, during an emergency shutdown of the charging pile, the control circuit 300 controls the auxiliary shutdown circuit 200 to be turned on, forming a bypass channel between the power module 400 and the load 500. During an emergency shutdown, the power module 400 can stop outputting or reduce its output current. However, due to potential issues such as bus capacitor energy, cable inductance current, or control response delay in the output current loop, the charging current in the output circuit 100 will not instantly drop to zero. Furthermore, a large charging current may cause the output circuit 100 to stick during disconnection. Therefore, this embodiment turns on the auxiliary shutdown circuit 200, and when the auxiliary shutdown circuit 200 is confirmed to be on, the control circuit 300 disconnects the output circuit 100 from the load 500, transferring the charging current in the output circuit 100 to the auxiliary shutdown circuit 200. Because the charging current in the output circuit 100 is transferred to the auxiliary shutdown circuit 200, the current flowing through the output circuit 100 decreases, and the breaking pressure of the mechanical contactor in the output circuit 100 also decreases.

[0029] As the charging current transfers from the output circuit 100 to the auxiliary shutdown circuit 200, the state of the auxiliary shutdown circuit 200 changes accordingly. If the operating current of the auxiliary shutdown circuit 200 is greater than or equal to the current threshold, it is determined that the charging current output by the power module 400 has been largely transferred from the output circuit 100 to the auxiliary shutdown circuit 200. At this point, the control circuit 300 disconnects the auxiliary shutdown circuit 200 to break the connection between the power module 400 and the load 500, thus shutting down the charging pile. It can be understood that even if a certain amount of charging current remains on the output circuit 100, the remaining charging current reduces the probability of arcing, burning, or sticking of the output circuit 100 contacts, and reduces the risk of overcurrent disconnection of the mechanical contactor in the output circuit 100.

[0030] In some implementations, the current threshold can be determined based on at least one of the following: the rated output current of the charging pile, the required current corresponding to the load 500, the rated current of the output circuit 100 or the auxiliary shutdown circuit 200, and the system protection margin. For example, if the power module 400 outputs a charging current of 1600A to the load 500 through the output circuit 100, the current threshold can be set to 1500A. When the operating current of the auxiliary shutdown circuit 200 is greater than or equal to 1500A, the control circuit 300 can determine that the charging current in the output circuit 100 has been substantially transferred to the auxiliary shutdown circuit 200, and control the shutdown of the auxiliary shutdown circuit 200.

[0031] In some implementations, the current threshold can be a fixed threshold pre-stored in the control circuit 300, or a variable threshold dynamically determined by the control circuit 300 based on the current charging conditions. This application embodiment does not limit the method of setting the current threshold; different current thresholds can be determined in application to adapt to different power levels and different charging current scenarios, thereby improving the accuracy of emergency shutdown protection.

[0032] In some embodiments, the control circuit 300 may further determine the auxiliary shutdown circuit 200 by combining its operating status, such as the on-time and current change rate, with the magnitude of the operating current, and then control the auxiliary shutdown circuit 200 to disconnect. For example, the control circuit 300 disconnects the auxiliary shutdown circuit 200 when the operating current in the auxiliary shutdown circuit 200 is greater than or equal to a current threshold and continues for a preset duration; or, the control circuit 300 disconnects the auxiliary shutdown circuit 200 when the operating current in the auxiliary shutdown circuit 200 is greater than or equal to a current threshold and the current change rate is greater than or equal to a change rate threshold.

[0033] This application embodiment combines multiple state data to control the auxiliary shutdown circuit 200, reducing the risk of false triggering, improving the accuracy of the on / off control of the auxiliary shutdown circuit 200, and thus improving the safety and reliability of the charging pile emergency shutdown process.

[0034] In this embodiment of the application, during an emergency shutdown, the charging current is transferred to the auxiliary shutdown circuit 200, and the auxiliary shutdown circuit 200 performs the shutdown operation. This reduces the risk of overcurrent disconnection in the output circuit 100 due to problems such as mechanical contactor adhesion during an emergency shutdown, extends the service life of the charging pile, and improves the safety and reliability of the charging pile.

[0035] In some embodiments, please refer to Figure 2 , Figure 2 This is a schematic diagram of another emergency shutdown protection device for charging piles provided in an embodiment of this application. Figure 2As shown, the auxiliary shutdown circuit 200 includes a semiconductor switch 210. A first terminal of the semiconductor switch 210 is connected to the power module, a second terminal of the semiconductor switch 210 is connected to the load, and a control terminal of the semiconductor switch 210 is connected to the control circuit 300. The control circuit 300 is configured to: in response to an emergency stop signal, send a first turn-on signal to the semiconductor switch 210 to turn on the auxiliary shutdown circuit 200; and when the operating current of the auxiliary shutdown circuit 200 is greater than or equal to a current threshold, send a first turn-off signal to the semiconductor switch 210 to turn off the auxiliary shutdown circuit 200.

[0036] Semiconductor switch 210 is an electronic switch that uses semiconductor devices to turn on or off. Unlike mechanical contactors, semiconductor switch 210 turns off by turning on or off the channels of its internal semiconductor. It has no mechanical contacts, and therefore does not generate an electric arc that could cause the contacts to weld together under high current, resulting in high reliability. Furthermore, semiconductor switches turn off by turning on or off the channels of their internal semiconductor devices, resulting in fast response speeds and enabling rapid current interruption in emergency shutdown conditions. For example, semiconductor switch 210 can be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), IGBT (Insulated Gate Bipolar Transistor), SiC MOSFET (Silicon Carbide MOSFET), or GaN power device (Gallium Nitride power device).

[0037] The control circuit 300 sends an on or off signal to the control terminal of the semiconductor switch 210 to control the on / off state of the semiconductor switch 210, thereby controlling the on / off state of the auxiliary shutdown circuit 200. The on and off signals can be implemented based on different voltage levels. The control circuit 300 can determine the on or off signal for controlling the semiconductor switch 210 based on the device type and connection method of the semiconductor switch 210, as well as the logic configuration of the control circuit 300.

[0038] For example, when the semiconductor switch 210 is an NMOS transistor, the control circuit 300 uses a high-level signal as a turn-on signal and a low-level signal as a turn-off signal.

[0039] Please continue reading. Figure 2Taking an NMOS transistor as an example, the semiconductor switch 210 has its gate connected to the control circuit 300 as the control terminal, its source connected to the power module 400 as the first terminal, and its drain connected to the load 500 as the second terminal. In some implementations, the source of the NMOS transistor can be connected to the load 500, and the drain to the power module 400; this embodiment does not limit this.

[0040] In some embodiments, please continue reading Figure 2 The semiconductor switch 210 also includes a Zener diode Z2 and a resistor R1 connected in series between its gate and source. The Zener diode Z2 and resistor R1 are gate drive protection devices for the semiconductor switch 210. The Zener diode Z2 is used to limit the gate voltage of the semiconductor switch 210 within a safe range, reducing the risk of damage to the control terminal of the semiconductor switch 210 due to overvoltage or transient spikes. The resistor R1 is used to limit the charging and discharging current of the gate of the semiconductor switch 210, regulate the switching speed of the semiconductor switch 210, and suppress oscillation at the control terminal.

[0041] In this embodiment, a semiconductor switch 210 is provided in the auxiliary shutdown circuit 200. In emergency shutdown conditions, the charging current can be transferred and the circuit can be quickly shut down based on the semiconductor switch 210, which reduces the risk of sticking when the output circuit 100 is shut down under high current conditions, extends the life of the charging pile, and improves the safety and reliability of the charging pile.

[0042] In some embodiments, please refer to Figure 3 , Figure 3 This is a schematic diagram of another emergency shutdown protection device for charging piles provided in an embodiment of this application. Figure 3 As shown, the auxiliary shutdown circuit 200 also includes a current sensor 220 connected in series with the semiconductor switch 210, and the current sensor 220 is also connected to the control circuit 300. The current sensor 220 is configured to: acquire the operating current of the auxiliary shutdown circuit 200 and transmit the current sample value to the control circuit 300.

[0043] The current sensor 220 is used to collect the operating current flowing through the auxiliary shutdown circuit 200 and transmit the collected current sample value to the control circuit 300 so that the control circuit 300 can control the on / off state of the semiconductor switch 210 based on the current sample value. The current sensor 220 can be connected in series between the semiconductor switch 210 and the power module 400, or it can be connected in series between the semiconductor switch 210 and the load 500. This embodiment of the application does not limit the connection position of the current sensor 220.

[0044] The current sample value collected by the current sensor 220 can be the instantaneous current value, peak current value, or average current value of the operating current in the auxiliary shutdown circuit 200. The control circuit 300 compares the current sample value collected by the current sensor 220 with a current threshold, and controls the semiconductor switch 210 to turn off if the current sample value is greater than or equal to the current threshold.

[0045] The current sensor 220 can be a Hall current sensor, a shunt, or other current detection device. The Hall current sensor detects magnetic fields based on the Hall effect, thus determining the current flowing through the semiconductor switch 210 based on the magnetic field strength. Because the Hall current sensor allows for electrical isolation detection, it is suitable for current acquisition in high-voltage, high-current DC circuits. The shunt calculates the operating current flowing through the auxiliary shutdown circuit 200 based on the voltage drop across its terminals and the shunt's resistance value.

[0046] For example, the current sensor 220 in this application embodiment uses a high-speed Hall current sensor. Since the high-speed Hall current sensor has a fast response speed, it can collect the operating current of the auxiliary shutdown circuit 200 in real time, so that the control circuit 300 can quickly trigger the semiconductor switch 210 to turn off.

[0047] In some embodiments, the control circuit 300 can also determine the on / off state of the semiconductor switch 210 based on the current sampling value of the current sensor 220. For example, if the current sensor 220 collects a current sampling value, it indicates that the semiconductor switch 210 is in the on state; if the current sensor 220 does not collect a current sampling value, it indicates that the semiconductor switch 210 is in the off state.

[0048] In this embodiment, a current sensor 220 is connected in series in the auxiliary shutdown circuit 200, so that the control circuit 300 can control the semiconductor switch 210 in the auxiliary shutdown circuit 200 in real time based on the current sampling value collected by the current sensor 220, thereby improving the accuracy and reliability of the on / off control of the auxiliary shutdown circuit 200.

[0049] In some embodiments, the control circuit 300 includes a controller 310, an overcurrent trigger module 320, and a logic shutdown module 330. The controller 310 is configured to output a shutdown drive signal based on an emergency stop signal. The input terminal of the overcurrent trigger module 320 is connected to a current sensor 220, and the overcurrent trigger module 320 is configured to output a first signal when the current sample value is greater than or equal to a current threshold. The first signal characterizes an overcurrent in the operating current of the auxiliary shutdown circuit, requiring the semiconductor switch to be turned off. The first input terminal of the logic shutdown module 330 receives the shutdown drive signal, and the second input terminal of the logic shutdown module 330 receives the first signal. The logic shutdown module 330 is configured to output a first shutdown signal based on the shutdown drive signal and the first signal.

[0050] The overcurrent trigger module 320 is used to monitor the operating current in the auxiliary shutdown circuit 200. When the operating current in the auxiliary shutdown circuit 200 is greater than or equal to the current threshold, it indicates that the charging current of the output circuit 100 has been basically transferred to the auxiliary shutdown circuit 200, and the risk of contact sticking of the contactor in the output circuit 100 is reduced. At this time, the semiconductor switch 210 in the auxiliary shutdown circuit 200 can be controlled to open, so that the current in the auxiliary shutdown circuit 200 drops to zero.

[0051] The overcurrent trigger module 320 is connected to the current sensor 220 and receives the current sampling value sent by the current sensor 220. When the current sampling value is greater than or equal to a current threshold, it outputs a first signal. Exemplarily, the overcurrent trigger module 320 includes a comparator and a latch. The comparator compares the acquired current sampling value with the current threshold and sends the comparison result to the latch. When the comparison result indicates that the current sampling value of the auxiliary shutdown circuit 200 is greater than or equal to the current threshold, the latch outputs a first signal to control the logic shutdown module 330 to output a first shutdown signal to the semiconductor switch 210 of the auxiliary shutdown circuit 200. The latch also latches the first signal, reducing the risk of the first signal disappearing due to a drop in current after the semiconductor switch 210 is turned off, thus improving the situation where the semiconductor switch 210 repeatedly turns on and off during emergency shutdown. Simultaneously, the latched first signal allows the logic shutdown module 330 to continuously output the first shutdown signal, which is beneficial for controlling the semiconductor switch 210 to remain in the off state, improving the reliability and determinism of the emergency shutdown protection action.

[0052] In some embodiments, when the overcurrent trigger module 320 determines that the current sample value of the auxiliary shutdown circuit 200 collected by the current sensor 220 is greater than or equal to the current threshold, it outputs a first signal after a first delay. For example, the first delay is 1ms. The overcurrent trigger module 320, upon receiving the current sample value collected by the current sensor 220 and determining that the current sample value is greater than or equal to the current threshold, outputs the first signal after a 1ms delay. This reduces current interference caused by the state switching between the output circuit 100 and the auxiliary shutdown circuit 200, which could lead to erroneous triggering of the overcurrent trigger module 320 and affect the reliability of the protection operation of the protection device.

[0053] The controller 310 outputs a shutdown drive signal based on the emergency shutdown signal of the charging pile. The logic shutdown module 330 is connected to the overcurrent trigger module 320 and the controller 310 respectively. It receives the first signal sent by the overcurrent trigger module 320 and the shutdown drive signal sent by the controller 310, and generates a first shutdown signal based on the received first shutdown drive signal. Then, it disconnects the semiconductor switch 210 according to the first shutdown signal.

[0054] In this embodiment, the logic shutdown module 330 controls the on / off state of the semiconductor switch 210. When the logic shutdown module 330 does not receive the first signal from the overcurrent trigger module 320, or does not receive the shutdown drive signal from the controller 310, the logic shutdown module 330 does not output the first shutdown signal, and the semiconductor switch 210 remains in the on state. When the current sampling value in the auxiliary shutdown circuit 200 is greater than or equal to the current threshold, the logic shutdown module 330 can quickly respond based on the received first signal and disconnect the semiconductor switch 210, improving the response speed and reliability of the emergency shutdown process.

[0055] In some embodiments, the overcurrent trigger module 320 is connected to the controller 310, and the overcurrent trigger module 320 is further configured to: receive a reset signal sent by the controller 310 and output a second signal; wherein the second signal is used to characterize that the operating current of the auxiliary shutdown circuit 200 is normal and there is no need to trigger the semiconductor switch 210 to shut down.

[0056] Please continue reading. Figure 3 The overcurrent trigger module 320 is also connected to the controller 310 and receives a reset signal sent by the controller 310. The reset signal is used to control the overcurrent trigger module 320 to reset, restoring it from the latched trigger state to the non-trigger state. The second signal is used to indicate that the overcurrent trigger module 320 has not detected an overcurrent in the operating current of the auxiliary shutdown circuit 200, that is, the operating current in the auxiliary shutdown current is normal and there is no need to trigger the semiconductor switch 210 to turn off.

[0057] The controller 310 sends a reset signal to the overcurrent trigger module 320 after the charging pile is powered on, initialization is completed, or an emergency stop protection process ends. The controller 310 can also send a reset signal when both the output circuit 100 and the auxiliary shutdown circuit 200 are disconnected or the emergency stop signal has been released, reducing the probability of accidentally resetting the overcurrent trigger module 320 before the fault is cleared, and improving the safety and reliability of the emergency stop protection process.

[0058] The control logic of the semiconductor switch 210 in the auxiliary shutdown circuit 200 will be explained below, using the logic shutdown module 330 as an example of an AND gate.

[0059] The logic shutdown module 330 in this embodiment uses an AND gate. The first input of the AND gate is connected to the controller 310, the second input is connected to the overcurrent trigger module 320, and the output output is a control signal that controls the on / off state of the semiconductor switch 210. In this embodiment, the semiconductor switch 210 is turned on when it receives a high-level signal and turned off when it receives a low-level signal.

[0060] In the initial power-on state of the charging pile, the controller 310 sends a reset signal to the overcurrent trigger module 320, causing the overcurrent trigger module 320 to reset and output a high-level second signal. In the emergency stop state, the controller 310 outputs a high-level stop drive signal to the AND gate based on the emergency stop signal. At this time, the overcurrent trigger module 320 is not triggered. The logic shutdown module 330 outputs a high-level first conduction signal based on the high-level stop drive signal and the high-level second signal, controlling the semiconductor switch 210 to conduct.

[0061] The overcurrent trigger module 320 is connected to the current sensor 220 and receives the current sampling value monitored in real time by the current sensor 220. When the current sampling value is greater than or equal to the current threshold, the overcurrent trigger module 320 is triggered and outputs a low-level first signal. Based on the low-level first signal, the logic shutdown module 330 outputs a low-level first shutdown signal to control the semiconductor switch 210 to turn off.

[0062] The logic shutdown module 330 may also include an OR gate and an inverter to achieve the effect of an AND gate. When the semiconductor switch 210 is a PMOS transistor, the semiconductor switch 210 turns on when it receives a low-level signal and turns off when it receives a high-level signal. The logic shutdown module 330 may also be a NAND gate, or a combination of an AND gate and an inverter. It is understood that the implementation of the logic shutdown module 330 in this application is not limited, as long as the semiconductor switch 210 can be turned on based on an emergency stop signal, causing the charging current of the output circuit 100 to be transferred to the auxiliary shutdown circuit 200; and after the current sampling value of the auxiliary shutdown circuit 200 causes the overcurrent trigger module 320 to output a first signal, the semiconductor switch 210 is controlled to turn off.

[0063] In some embodiments, please refer to Figure 4 , Figure 4 This is a schematic diagram of another emergency shutdown protection device for charging piles provided in an embodiment of this application. Figure 4 As shown, the control circuit 300 also includes an isolation drive module 340, the input terminal of which is connected to the logic shutdown module 330, and the output terminal of which is connected to the semiconductor switch 210.

[0064] An isolation drive module 340 is disposed between the output terminal of the logic shutdown module 330 and the control terminal of the semiconductor switch 210, and is used to electrically isolate the signals transmitted from the logic shutdown module 330 to the semiconductor switch 210. In this embodiment, the isolation drive module 340 is provided in the control circuit 300. This isolation drive module 340 can achieve electrical isolation between the control side and the power side, reducing the impact of high voltage, high current, and common-mode transient interference in the auxiliary shutdown circuit 200 on the control circuit 300, and improving the safety and reliability of the emergency shutdown protection device. For example, the isolation drive module 340 may include isolation devices such as optocouplers, magnetic isolators, and capacitive isolators to improve the reliability and anti-interference capability of the on / off control of the semiconductor switch 210.

[0065] In some embodiments, please continue reading Figure 4 The auxiliary shutdown circuit 200 further includes an auxiliary contactor 230 connected in series with the semiconductor switch 210, the control terminal of the auxiliary contactor 230 being connected to the control circuit 300; wherein the control circuit 300 is configured to: send a second turn-on signal to the auxiliary contactor 230 upon receiving a power-on signal from the charging pile; or, send a second turn-off signal to the auxiliary contactor 230 after the semiconductor switch 210 is turned off based on a first turn-off signal.

[0066] The auxiliary contactor 230 is connected in series with the semiconductor switch 210 and is a switching device in the auxiliary shutdown circuit 200 used to provide a mechanical break. Since the semiconductor switch 210 may still have leakage current in the off state and cannot form a mechanical break, this embodiment of the application provides an auxiliary contactor 230 in the auxiliary shutdown circuit 200. The auxiliary contactor 230 and the semiconductor switch 210 are combined to jointly realize the on-off control of the auxiliary shutdown circuit 200. After the semiconductor switch 210 cuts off the current, the auxiliary contactor 230 is disconnected, thus meeting the mechanical isolation requirements of the auxiliary shutdown circuit 200.

[0067] The control circuit 300 is connected to the auxiliary contactor 230. During the power-on process of the charging pile, a second conduction signal is sent to the auxiliary contactor 230 to turn it on. During the normal charging process of the charging pile, the output circuit 100 is turned on, and the charging current output by the power module 400 is transmitted to the load through the output circuit 100. Since the semiconductor switch 210 is in the off state, even if the auxiliary contactor 230 is in the on state, the auxiliary shutdown circuit 200 will not form a complete current path and will not bear the normal charging current.

[0068] In this embodiment, the auxiliary contactor 230 is pre-engaged during the charging pile's power-on process because the auxiliary contactor 230 is a mechanical switch device. Its closing action requires coil excitation, movement of the moving iron core, and contact closure, resulting in a slow response speed. If the auxiliary contactor 230 is only activated after an emergency stop event occurs, the auxiliary shutdown circuit 200 may not be able to activate in time before the output circuit 100 is disconnected, causing the mechanical switch in the output circuit 100 to still need to disconnect with a large current. Therefore, this embodiment enables the mechanical closing operation of the auxiliary shutdown circuit 200 to be completed in advance by pre-activating the auxiliary contactor 230 after the charging pile is powered on. When an emergency stop signal arrives, the control circuit 300 only needs to quickly activate the semiconductor switch 210 to rapidly control the auxiliary shutdown circuit 200 to form a current transfer path. That is, the auxiliary contactor 230 is pre-engaged before the semiconductor switch 210 is activated.

[0069] The control circuit 300 also controls the auxiliary contactor 230 to disconnect after the semiconductor switch 210 is turned off, thereby improving the reliability of emergency stop operations. After the semiconductor switch 210 is turned off based on the first turn-off signal, the control circuit 300 sends a second turn-off signal to the auxiliary contactor 230, causing the auxiliary contactor 230 to disconnect based on the second turn-off signal. Since the semiconductor switch 210 has already been turned off, the current in the auxiliary turn-off circuit 200 has been reduced to zero or a safe range. The auxiliary contactor 230 can disconnect under no-current or low-current conditions, thereby reducing the risk of arcing, burning, or sticking of the auxiliary contactor 230 contacts. Simultaneously, the disconnection of the auxiliary contactor 230 creates a mechanical break in the auxiliary turn-off circuit 200, reducing the risk of leakage current even after the semiconductor switch 210 is turned off. Electrical isolation through the mechanical port improves the electrical isolation reliability of the charging pile output circuit.

[0070] In some implementations, the auxiliary contactor 230 disconnects after a preset time following the opening of the semiconductor switch 210. The preset time can be determined based on the turn-off time of the semiconductor switch 210, the current decay time in the auxiliary shutdown circuit 200, or the operating time of the auxiliary contactor 230. Alternatively, the control circuit 300 can control the auxiliary contactor 230 to disconnect after the semiconductor switch 210 is turned off, based on the result that the current in the auxiliary shutdown circuit 200 detected by the current sensor 220 is less than a safe current threshold. For example, the preset time is 1 ms. This embodiment controls the auxiliary contactor 230 to disconnect after a preset time following the opening of the semiconductor switch 210, enabling the auxiliary contactor 230 to disconnect under safe current conditions. This helps ensure accurate timing of the on / off control of the semiconductor switch 210 and the auxiliary contactor 230, improving the reliability of the emergency shutdown protection process.

[0071] In some embodiments, please continue reading Figure 3 The output circuit 100 includes at least two parallel output contactors 110. The first terminal of each output contactor 110 is connected to the power module, the second terminal of each output contactor 110 is connected to the load, and the control terminal of each output contactor is connected to the control circuit 300. The control circuit 300 is configured to: when the charging pile is in a charging state, simultaneously send a third turn-on signal to each output contactor 110 to allow the charging current of the power module to be transmitted to the load through the output contactor 110; and when the auxiliary shutdown circuit 200 is turned on in response to an emergency stop signal, simultaneously send a third shutdown signal to each output contactor 110 to disconnect the output circuit 100.

[0072] The output circuit 100 includes at least two output contactors 110, each of which is also connected to the control circuit 300. When the charging pile is in a charging state, the control circuit 300 sends a third conduction signal to each output contactor 110, controlling each output contactor 110 to conduct, thereby activating the output circuit 100. When the auxiliary shutdown circuit 200 is activated in response to an emergency stop signal, the control circuit 300 sends a third shutdown signal to each output contactor 110, controlling each output contactor 110 to disconnect, thereby disconnecting the output circuit 100.

[0073] The output circuit 100 of this embodiment includes at least two parallel output contactors 110. In the charging state, the charging current output by the power module 400 can be carried jointly by the at least two output contactors 110. By utilizing the parallel connection of multiple contactors with relatively small rated currents, a large current output is achieved, reducing the difficulty of selecting DC contactors and the cost of components in the output circuit 100. For example, when the power module 400 outputs a charging current of 1600A, the output circuit 100 is equipped with two parallel output contactors 110 to each handle an 800A charging current transmission.

[0074] The control circuit 300 controls the on / off state of all output contactors 110 in the output circuit 100 simultaneously using a single control signal. However, due to differences in parameters between the different output contactors 110, their response speeds to the on / off signals from the control circuit 300 will not be completely consistent, and the output contactors 110 may switch on and off sequentially in actual operation.

[0075] Taking the disconnection control process of output contactor 110 as an example, when the auxiliary shutdown circuit 200 includes semiconductor switch 210: In response to an emergency stop signal, control circuit 300 first controls auxiliary shutdown circuit 200 to conduct, and simultaneously sends a third shutdown signal to output contactor 110 in output circuit 100 while auxiliary shutdown circuit 200 is conducting, to control output contactor 110 to disconnect, transferring the charging current in output circuit 100 to auxiliary shutdown circuit 200. When output circuit 100 includes contactor K1 and contactor K2, due to the parameter difference between contactor K1 and contactor K2, the two contactors will not disconnect simultaneously. Assuming contactor K1 disconnects first, the charging current of output circuit 100 is transferred to contactor K2 and auxiliary shutdown circuit 200. Since the bulk resistance of semiconductor switch 210 in auxiliary shutdown circuit 200 is greater than the contact resistance of contactor K2, the charging current is still mainly on contactor K2. At this time, contactor K2 disconnects, and the charging current is transferred to auxiliary shutdown circuit 200.

[0076] It should be noted that during the process of the output contactor 110 in the output circuit 100 being disconnected based on the third shutdown signal, each output contactor 110 will also experience a large current flow for a short period of time. Since the DC contactor has a certain short-time current tolerance capability (such as 20ms), disconnecting the output contactor 110 during the transfer of the charging current to the auxiliary shutdown circuit 200 is beneficial for the output contactor 110 to be disconnected in a state of no current or small current.

[0077] In summary, even if the two output contactors 110 in the output circuit 100 disconnect asynchronously in response to the same third shutdown signal due to differences in their own parameters, the output contactor 110 that disconnects later can transfer the charging current through the already connected auxiliary shutdown circuit 200, thereby reducing the risk that the output contactor 110 that disconnects later will bear the large current and eventually disconnect on its own, and reducing the risk of overcurrent sticking due to asynchronous disconnection of the output contactors 110.

[0078] Secondly, embodiments of this application provide a charging pile.

[0079] Please continue reading. Figure 4 The charging pile includes a power module 400 and an emergency shutdown protection device for the charging pile as provided in the first aspect embodiment. The power module 400 is connected to the load 500 through the protection device.

[0080] like Figure 4 As shown, the power module 400 includes multiple power units connected in parallel. Each power unit is connected to a DC contactor and is connected to the charging circuit, which is connected to the output circuit 100 of the protection device or the auxiliary shutdown circuit 200, through the corresponding DC contactor. For example, power unit n is connected to the charging circuit through DC contactor Kpn. Based on the charging requirements of the load 500, the power module 400 determines the power unit with the required output power and controls the DC contactor corresponding to the power unit to be turned on, thereby connecting the power unit to the charging circuit. The power module 400 uses DC contactors with a rated current range of 300A or 400A to connect the power units, minimizing the risk of high-current sticking.

[0081] In some embodiments, load 500 is an electric vehicle (EV).

[0082] It should be understood that for a detailed description of the structure, working method and beneficial effects of each module in the above-mentioned charging pile, please refer to the embodiment of the above-mentioned charging pile emergency shutdown protection device, which will not be elaborated here.

[0083] Thirdly, embodiments of this application provide a control method for an emergency shutdown protection device for a charging pile.

[0084] Please see Figure 5 , Figure 5 This is a schematic flowchart illustrating a control method for an emergency shutdown protection device for a charging pile, provided in an embodiment of this application. The emergency shutdown protection device includes an output circuit and an auxiliary shutdown circuit. The output circuit is connected in series between the power module and the load of the charging pile, and the auxiliary shutdown circuit is connected in parallel with the output circuit. Figure 5 As shown, the method includes steps S510 to S520.

[0085] In step S510, in response to the emergency stop signal of the charging pile, the auxiliary shutdown circuit is turned on, and the output circuit is turned off while the auxiliary shutdown circuit is turned on, so that the charging current in the output circuit is transferred to the auxiliary shutdown circuit.

[0086] Step S520: When the operating current of the auxiliary shutdown circuit is greater than or equal to the current threshold, disconnect the auxiliary shutdown circuit.

[0087] It should be understood that for a detailed explanation of the specific steps and beneficial effects of the control method of the above-mentioned charging pile emergency shutdown protection device, please refer to the embodiment of the above-mentioned charging pile emergency shutdown protection device, which will not be elaborated here.

[0088] The following example illustrates the control method of the emergency shutdown protection device for charging piles.

[0089] by Figure 4 Taking the charging pile shown as an example, the charging pile emergency stop protection device includes an output circuit 100 connected in series between the power module 400 and the load 500, an auxiliary shutdown circuit 200 connected in parallel with the output circuit 100, and a control circuit 300 connected to the output circuit 100 and the auxiliary shutdown circuit 200 respectively. The output circuit 100 includes output contactors K1 and K2 connected in parallel. The auxiliary shutdown circuit 200 includes an auxiliary contactor K3 connected in series and a semiconductor switch Q, where the semiconductor switch Q is an NMOS transistor. The control circuit 300 includes a controller 310, an overcurrent trigger module 320, a logic shutdown module 330, and an isolation drive module 340.

[0090] The control circuit 300 controls the on / off state of the semiconductor switch Q based on a first control signal sent by the logic shutdown module 330. A high level of the first control signal corresponds to a first on signal, and a low level corresponds to a first off signal. The first control signal is obtained by the logic shutdown module 330 based on a stop drive signal sent by the controller 310 and a first signal output by the overcurrent trigger module 320. The control circuit 300 controls the on / off state of the auxiliary contactor K3 based on a second control signal sent by the controller 310. A high level of the second control signal corresponds to a second on signal, and a low level corresponds to a second off signal. The control circuit 300 controls the on / off state of the output contactors K1 and K2 based on a third control signal sent by the controller 310. A high level of the third control signal corresponds to a third on signal, and a low level corresponds to a third off signal.

[0091] Please see Figure 6 , Figure 6 This is a flowchart illustrating a charging pile control method provided in an embodiment of this application. Figure 6 As shown, the method includes steps S610 to S650.

[0092] In step S610, the charging pile is powered on, the auxiliary contactor is pre-engaged, the output contactor and the semiconductor switch are both disconnected, and the overcurrent trigger module is reset.

[0093] When the charging pile is powered on, the controller 310, upon receiving the power-on signal from the charging pile, outputs a high-level second control signal to the auxiliary contactor K3, controlling the auxiliary contactor K3 to pre-close. At this time, the semiconductor switch Q does not receive a control signal and is in the default open state. The controller 310 sends a reset signal to the overcurrent trigger module 320, causing the overcurrent trigger module 320 to be in a non-trigger locked state. The third control signal is low by default, and the output contactors K1 and K2 are in the ready state.

[0094] In step S620, the power module outputs charging current to the load through the output circuit.

[0095] The 500 electric vehicle load requests a charging current of 1600A. After the vehicle-to-charging station guidance process, the controller 310 outputs a high-level third control signal to control the output contactors K1 and K2 to conduct. The power module 400 outputs two 800A charging currents respectively through the output contactors according to the charging demand, so as to combine them into a 1600A charging current to be transmitted to the load.

[0096] In step S630, in response to the emergency shutdown signal of the charging pile, the semiconductor switch is turned on to activate the auxiliary shutdown circuit.

[0097] In response to the emergency stop signal from the charging pile, the controller 310 outputs a high-level stop drive signal to the logic shutdown module 330. At this time, the overcurrent trigger module 320 is in a non-triggered state and outputs a high-level second signal by default. The logic shutdown module 330 outputs a high-level first control signal, which is sent to the gate of the semiconductor switch Q through the isolation drive module 340, driving the semiconductor switch Q to conduct. Since the auxiliary contactor K3 has been pre-engaged, the auxiliary shutdown circuit 200 conducts as the semiconductor switch Q conducts.

[0098] Step S640: With the auxiliary shutdown circuit on, disconnect the output circuit.

[0099] With the auxiliary shutdown circuit 200 conducting, the controller 310 outputs a low-level third control signal to open output contactors K1 and K2, thereby disconnecting output circuit 100. Due to the difference in their parameters, output contactors K1 and K2 have different opening times. Assuming output contactor K1 opens first, the entire 1600A charging current is transferred to output contactor K2 and the auxiliary shutdown circuit 200. Since the bulk resistance of semiconductor switch Q is greater than the contact resistance of output contactor K2, almost all the charging current is in output contactor K2. As output contactor K2 opens, the entire charging current is transferred to the auxiliary shutdown circuit 200 loop formed by semiconductor switch Q and auxiliary contactor K3.

[0100] In step S650, when the operating current of the auxiliary shutdown circuit is greater than or equal to the current threshold, the semiconductor switch and the auxiliary contactor are turned off sequentially.

[0101] A high-speed Hall sensor connected in series in the auxiliary shutdown circuit 200 monitors and acquires the operating current in the auxiliary shutdown circuit 200, and sends the acquired current sample value to the overcurrent trigger module 320. After receiving the current sample value from the auxiliary shutdown circuit 200 for 1ms, the overcurrent trigger module 320 compares the received current sample value with a current threshold. The current threshold can be 1500A. When the current sample value reaches 1500A, the overcurrent trigger module 320 outputs a low-level first signal to the logic shutdown module 330, causing the logic shutdown module 330 to output a low-level first control signal based on the low-level first signal to turn off the semiconductor switch Q.

[0102] As the semiconductor switch Q is turned off, the 1600A current in the auxiliary shutdown circuit 200 rapidly decreases to zero. After a 1ms delay, the controller 310 outputs a low-level second control signal to turn off the auxiliary contactor K3.

[0103] After the auxiliary shutdown circuit 200 is disconnected and the emergency stop state is lifted, return to the preparation state in step S610 and repeat the above process.

[0104] In this embodiment, when the charging pile outputs a large charging current, a parallel low-current DC contactor is used for transmission, which reduces the difficulty of selecting the DC contactor. The auxiliary shutdown circuit also reduces the risk of the DC contactor sticking and burning out due to over-rated current disconnection in emergency shutdown conditions, thus extending the service life of the charging pile and improving its safety and reliability.

[0105] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0106] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0107] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0108] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An emergency shutdown protection device for charging piles, characterized in that, include: The system comprises an output circuit (100), an auxiliary shutdown circuit (200), and a control circuit (300). The output circuit (100) is connected in series between the power module (400) and the load (500) of the charging pile. The auxiliary shutdown circuit (200) is connected in parallel with the output circuit (100). The control circuit is connected to both the output circuit (100) and the auxiliary shutdown circuit (200). The control circuit (300) is configured as follows: In response to the emergency shutdown signal of the charging pile, the auxiliary shutdown circuit (200) is turned on, and the output circuit (100) is turned off while the auxiliary shutdown circuit (200) is turned on, so that the charging current in the output circuit (100) is transferred to the auxiliary shutdown circuit (200). When the operating current of the auxiliary shutdown circuit (200) is greater than or equal to the current threshold, the auxiliary shutdown circuit (200) is disconnected.

2. The apparatus according to claim 1, characterized in that, The auxiliary shutdown circuit (200) includes: a semiconductor switch (210), a first terminal of which is connected to the power module, a second terminal of which is connected to the load (500), and a control terminal of which is connected to the control circuit (300); wherein the control circuit (300) is configured to: In response to the emergency shutdown signal, a first turn-on signal is sent to the semiconductor switch (210) to turn on the auxiliary shutdown circuit (200). When the operating current of the auxiliary shutdown circuit (200) is greater than or equal to the current threshold, a first shutdown signal is sent to the semiconductor switch (210) to disconnect the auxiliary shutdown circuit (200).

3. The apparatus according to claim 2, characterized in that, The auxiliary shutdown circuit (200) further includes a current sensor (220) connected in series with the semiconductor switch (210), and the current sensor (220) is also connected to the control circuit (300); wherein, The current sensor (220) is configured to: collect the operating current of the auxiliary shutdown circuit (200) and transmit the current sample value to the control circuit (300).

4. The apparatus according to claim 3, characterized in that, The control circuit (300) includes: The controller (310) is configured to output a stop drive signal based on the emergency stop signal; An overcurrent trigger module (320) is provided, the input of which is connected to the current sensor (220). The overcurrent trigger module (320) is configured to output a first signal when the current sample value is greater than or equal to a current threshold. The first signal is used to characterize the overcurrent of the operating current of the auxiliary shutdown circuit (200), which requires triggering the semiconductor switch (210) to shut down. A logic shutdown module (330) is configured to output a first shutdown signal based on the shutdown drive signal and the first signal.

5. The apparatus according to claim 4, characterized in that, The overcurrent trigger module (320) is connected to the controller (310). The overcurrent trigger module (320) is also configured to receive a reset signal sent by the controller (310) and output a second signal. The second signal is used to indicate that the operating current of the auxiliary shutdown circuit (200) is normal and there is no need to trigger the semiconductor switch (210) to shut down.

6. The apparatus according to claim 4, characterized in that, The control circuit (300) further includes an isolation drive module (340), the input terminal of which is connected to the logic shutdown module (330), and the output terminal of which is connected to the semiconductor switch (210).

7. The apparatus according to claim 2, characterized in that, The auxiliary shutdown circuit (200) further includes: an auxiliary contactor (230) connected in series with the semiconductor switch (210), the control terminal of the auxiliary contactor (230) being connected to the control circuit (300); wherein the control circuit (300) is configured to: Upon receiving the power-on signal from the charging pile, a second conduction signal is sent to the auxiliary contactor (230); Alternatively, after the semiconductor switch (210) is turned off based on the first turn-off signal, a second turn-off signal is sent to the auxiliary contactor (230).

8. The apparatus according to claim 1, characterized in that, The output circuit (100) includes at least two parallel output contactors (110), the first end of each output contactor (110) is connected to the power module, the second end of each output contactor (110) is connected to the load (500), and the control terminal of each output contactor is connected to the control circuit (300); wherein, the control circuit (300) is configured as follows: When the charging pile is in the charging state, a third conduction signal is sent to each of the output contactors (110) to transmit the charging current of the power module to the load (500) through each of the output contactors (110). When the auxiliary shutdown circuit (200) is activated in response to the emergency stop signal, it simultaneously sends a third shutdown signal to each of the output contactors (110) to disconnect the output circuit (100).

9. A control method for an emergency shutdown protection device for a charging pile, characterized in that, The protection device includes: an output circuit and an auxiliary shutdown circuit, wherein the output circuit is connected in series between the power module of the charging pile and the load, and the auxiliary shutdown circuit is connected in parallel with the output circuit; the method includes: In response to the emergency shutdown signal of the charging pile, the auxiliary shutdown circuit is turned on, and the output circuit is turned off while the auxiliary shutdown circuit is turned on, so that the charging current in the output circuit is transferred to the auxiliary shutdown circuit. When the operating current of the auxiliary shutdown circuit is greater than or equal to the current threshold, the auxiliary shutdown circuit is disconnected.

10. A charging pile, characterized in that, include: The power module (400) and the charging pile emergency shutdown protection device as described in any one of claims 1 to 8, wherein the power module (400) is connected to the load (500) through the protection device.

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