Electric control protection unit of integrated excitation fuse

Abstract

The utility model relates to the field of electric power control and electric vehicles, in particular to an electric control protection unit of an integrated excitation fuse, which comprises a control loop, and a power semiconductor switch device, an excitation fuse and an electric control switch which are sequentially connected in series, the conducting bar of the excitation fuse is connected in series with a shunt for collecting electric signals on the conducting bar; the excitation source, the electric control switch, the diverter and the power semiconductor switch device are connected with the control loop, and the control loop outputs different control signals according to received external control signals and current signals collected by the diverter. And the electric control switch, the power semiconductor switch device and the excitation source root of the excitation fuse are controlled to act under different working conditions, so that the on-off of a main loop is realized. According to the invention, full-range protection in weak current and strong current states can be realized, control links are reduced, and accurate control is carried out by a unified control loop aiming at different working conditions.

Description

Technical Field

[0001] The present invention relates to the fields of power control and electric vehicles, and particularly to an electric control protection unit integrated with an excitation fuse. Background Art

[0002] At present, a relatively mature excitation fuse product already exists on the market, which disconnects the circuit in a mechanical disconnection manner. Its general structure components are: an upper housing, a conductive bar, and a lower housing arranged in sequence. An electronic ignition device and a piston (breaking device) are sequentially arranged in the upper housing. One end of the piston facing the electronic ignition device is in sealed contact with the upper housing. A sealed chamber is formed between the electronic ignition device and the piston. The signal receiving end of the electronic ignition device is located outside the housing. The conductive bar is arranged between the upper housing and the lower housing. A melt and an arc extinguishing chamber filled with an arc extinguishing medium for the melt to pass through are arranged in the lower housing. Both ends of the conductive bar located outside the housing serve as the input end and the output end that can be connected to the main circuit. A pre-breaking port is provided on the conductive bar inside the housing. The impact end of the piston is arranged corresponding to the pre-breaking port of the conductive bar. Both ends of the melt are connected in parallel on both sides of the pre-breaking port of the conductive bar. A displacement channel is arranged in the sealed chamber filled with the arc extinguishing medium. A melt cutter is arranged in the displacement channel. The melt passes through the displacement channel. The melt cutter is located on the displacement path of the piston.

[0003] The working principle is as follows: The conductive bar of the excitation fuse is connected in series in the main circuit. In the normal working state, current flows through the conductive bar of the excitation fuse, and the product can be regarded as a conductor. When it is necessary to cut off the circuit in an abnormal working state (such as when the current exceeds the set threshold or there is a short circuit, the vehicle collides, there is a fire, etc.), the control system at the user end sends a trigger signal to the electronic ignition device. The electronic ignition device acts to release high-pressure gas as a driving force, driving the piston to displace towards the conductive bar direction. The piston disconnects the conductive bar from the pre-breaking port of the conductive bar, forming a physical break on the conductive bar. At the moment when the conductive bar is disconnected, most of the current flows through the parallel-connected melt. The piston continues to displace, pushing the melt cutter to displace, thereby cutting off the melt and completely cutting off the circuit.

[0004] As can be seen from the above, when the excitation fuse is applied in circuit protection, only by sending a trigger signal from the control system to the excitation source and through the action of the excitation source can the main circuit be cut off. The existing excitation fuse has a relatively narrow application range and is only suitable for cutting off the main circuit under specific abnormal conditions. The product usage range has limitations and cannot adapt to current change paths with larger or smaller currents. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an electronic control protection unit integrated with an excitation fuse, which connects the excitation fuse in series with switching devices of different performances, controls the on-off of the main circuit through an external control signal combined with the current signal collected by the electronic control protection unit itself, reduces the control link, improves the control accuracy, and realizes circuit protection within the full current range.

[0006] To solve the above technical problem, the technical solution of the present invention is an electronic control protection unit integrated with an excitation fuse, which includes a control circuit, and a power semiconductor switching device, an excitation fuse, and an electronic control switch connected in series in sequence;

[0007] The excitation fuse includes an excitation module and a conductive bar. The excitation module includes an excitation source and a breaking device. The conductive bar is connected in series with the power semiconductor switching device and the electronic control switch; a shunt for collecting the electrical signal on the conductive bar is connected in series on the conductive bar;

[0008] The excitation source, the electronic control switch, the shunt, and the power semiconductor switching device are respectively connected to the control circuit. The power semiconductor switching device and the electronic control switch are normally open devices;

[0009] When the main circuit needs to be turned on, the control circuit controls the electronic control switch to close and the power semiconductor switching device to conduct according to the received external control signal, so that the main circuit is turned on; when the main circuit needs to be turned off under the normal current-carrying state, the control circuit controls the electronic control switch or the power semiconductor switching device to turn off according to the received external control signal, and turns off the main circuit;

[0010] Under the current-carrying state of the main circuit, the control circuit outputs different control signals according to the electrical signal monitored by the shunt, and respectively controls the actions of the excitation source, the electronic control switch, and the power semiconductor switching device:

[0011] When the current in the main circuit is a small fault current, the control circuit controls the electronic control switch to turn off, and the main circuit is turned off;

[0012] When the current in the main circuit is a large fault current, the control circuit controls the excitation source to act, drives the breaking device to break the conductive bar, and the main circuit is turned off.

[0013] Preferably, when the main circuit needs to be turned on, the control circuit controls the electronic control switch to close, and then controls the power semiconductor switching device to conduct, so that the main circuit is turned on.

[0014] Preferably, a temperature sensor is further arranged on the conductive bar. The temperature sensor is connected to the control circuit. When the temperature is abnormal, the control circuit controls the excitation source to act.

[0015] Preferably, the control loop is integrated in an electronic control protection unit, and the control loop is a PCB control board.

[0016] Preferably, the shunt is a manganin resistor shunt, and the shunt is connected in series with the busbar by being wrapped on the busbar portion between the input end and the output end of the busbar, or is connected in series with the busbar as the portion of the busbar to be disconnected, or is connected in series at the output end of the busbar.

[0017] Preferably, the power semiconductor switching device is an IGBT device or a SiC semiconductor power switching device.

[0018] Preferably, the electronic control switch is a closed relay.

[0019] Preferably, an arc extinguishing fuse is connected in parallel with the busbar. Both ends of the fuse are respectively connected to the busbar portions outside both ends of the portion of the busbar to be disconnected; the fuse is arranged in an arc extinguishing medium, and a plurality of narrow necks are arranged on the fuse.

[0020] Preferably, the excitation source can also receive an external trigger signal to act, drive the breaking device to disconnect the busbar, and disconnect the main circuit.

[0021] Preferably, the control loop is wirelessly or wiredly connected to the excitation source and the power semiconductor switching device respectively.

[0022] In the excitation fuse of the present invention, the busbar portion is designed as an electronic control switch in series with a shunt for opening and closing a small current. By measuring the voltage drop and temperature rise conditions during the current flowing through the busbar, and by real-time monitoring and regulating parameters such as the current, voltage, and temperature of the circuit, the control loop controls the actions of corresponding devices according to the current and temperature changes in the main circuit, maximally utilizing energy resources, enhancing the reliability and stability during its breaking process. When it is applied to an electric vehicle, it can greatly reduce the working pressure of the vehicle and the total control module of the electrical device, making it a module that can operate independently; it can also increase the working current range of the excitation fuse module and avoid losses caused by misoperation.

[0023] The control loop is an overall control unit that controls the actions of the excitation source, the electronic control switch, and the power semiconductor switching device. The electronic control switch and the power semiconductor switching device are normally open switching devices. The control loop can be integrated in an electronic control protection unit or can be arranged at the user end.

[0024] Full-range protection in weak current and strong current states can be achieved.

[0025] When the main circuit needs to be powered on and conducted, the control circuit, based on the received external power-on signal, preferably first controls the electrical control switch to close, and then controls the power semiconductor switch device to conduct, thus conducting the main circuit and enabling the main circuit to conduct current normally. When the main circuit needs to be disconnected under normal current conduction conditions, the control circuit controls the electrical control switch to disconnect or the power semiconductor switch device to disconnect based on the received external power-off signal, thereby disconnecting the main circuit. Preferably, the main circuit is disconnected by controlling the power semiconductor switch device to disconnect. That is to say, the power-on and power-off of the main circuit under normal conditions are achieved by the control system at the user end sending control signals (power-on signal / disconnection signal) to the control circuit, and the control circuit controls the corresponding actions of the electrical control switch and the power semiconductor switch device.

[0026] By collecting data from the shunt and temperature sensors, including parameters such as temperature, voltage, and current, the control circuit can monitor the working conditions of the main circuit in real time, and compare the received monitoring data with the set threshold values to determine whether there are abnormalities in the main circuit, reducing the control link, and enabling precise control by a unified control circuit for different working conditions.

[0027] The current flows through the busbar connected in series to protect the main circuit. The resistance of the busbar is much smaller than that of the fuse element. When the busbar is conducting, almost all the current flows through the busbar, which will not cause adverse effects on the fuse element. Moreover, due to the large cross-section and small resistance of the busbar, it has good current impact resistance.

[0028] The overall electrical control protection unit (including the control circuit, excitation fuse, power semiconductor switch device, and electrical control switch) is designed with an overall seal and no ventilation holes, which can prevent foreign objects from contaminating the break, and can also prevent the high-temperature arc from spraying out of the housing and damaging the surrounding devices, improving the protection level. Brief Description of the Drawings

[0029] Figure 1 is a schematic structural diagram of the present invention.

[0030] Figure 2 is a logic block diagram of the control circuit outputting control signals according to the working conditions.

[0031] Reference Numerals:

[0032] Busbar 10, weak disconnection point 101, excitation module 11, arc-extinguishing fuse element 12, shunt 13, temperature sensor 14, excitation source, power semiconductor switch device 15, electrical control switch 16, control circuit 17. Detailed Description of the Invention

[0033] The electrical control protection unit with an integrated excitation fuse of the present invention includes a control circuit, and a power semiconductor switch device, an excitation fuse, and an electrical control switch connected in series in sequence;

[0034] The excitation fuse includes an excitation module and a busbar. The excitation module includes an excitation source and a breaking device. The busbar is connected in series with a power semiconductor switching device and an electric control switch. A shunt for collecting the electrical signal on the busbar is connected in series on the busbar.

[0035] The excitation source, the electric control switch, the shunt, and the power semiconductor switching device are respectively connected to a control circuit. The power semiconductor switching device and the electric control switch are normally open devices.

[0036] When the main circuit needs to be turned on, the control circuit controls the electric control switch to close and the power semiconductor switching device to conduct according to the received external control signal, so that the main circuit is turned on. When the main circuit needs to be turned off under the normal current-carrying state, the control circuit controls the electric control switch or the power semiconductor switching device to turn off according to the received external control signal, and the main circuit is turned off.

[0037] Under the current-carrying state of the main circuit, the control circuit outputs different control signals according to the electrical signal monitored by the shunt, and respectively controls the actions of the excitation source, the electric control switch, and the power semiconductor switching device:

[0038] When the current in the main circuit is a small fault current, the control circuit controls the electric control switch to turn off, and the main circuit is turned off.

[0039] When the current in the main circuit is a large fault current, the control circuit controls the excitation source to act, driving the breaking device to disconnect the busbar, and the main circuit is turned off.

[0040] The following gives a preferred embodiment and specifically describes it in combination with the drawings. The orientation words involved are only based on the orientation shown in the drawings and do not constitute a limitation to the technical solution of the present invention.

[0041] Refer to Figure 1 , the excitation fuse includes a busbar 10, an excitation module 11, and an arc-extinguishing fuse element 12. The busbar 10 is made of a conductive material. A breaking weak point 101 for reducing the mechanical strength is provided on the busbar 10 to form a pre-fracture. When the busbar 10 needs to be disconnected, a driving force acts on the pre-fracture of the busbar, so that the busbar is disconnected from the breaking weak point 101 to form a fracture. In Figure 1 , V-shaped grooves are spaced apart at corresponding positions on both sides of the busbar 10 as the breaking weak point 101. When the busbar 10 is disconnected, the driving force acts on the breaking weak point 101, and the busbar is disconnected from the V-shaped groove, forming a fracture between the two breaking weak points. In other embodiments, only one breaking weak point on the busbar 10 can be used as the pre-fracture, and the busbar is disconnected from one position to form a fracture.

[0042] The excitation module 11 includes an excitation source and a breaking device (not shown) made of an insulating material. The breaking device is arranged corresponding to the pre-breaking port of the bus bar 10, and the excitation source is arranged corresponding to the breaking device. The excitation source is an electronic ignition device, which can act according to the received trigger signal, release high-pressure gas as a driving force, drive the displacement of the breaking device, and the breaking device disconnects the bus bar from the pre-breaking port of the bus bar, forming a breaking port at the pre-breaking port. The breaking device is preferably a piston structure. The setting of the breaking device needs to prevent the high-pressure gas released by the excitation source from entering between the breaking device and the bus bar to form an obstacle to the displacement of the breaking device. In the actual structure, one end of the breaking device facing the excitation source needs to form a sealed contact with the inner wall of the housing in contact with it. The high-pressure gas released by the excitation source between the excitation source and the breaking device is sufficient to drive the breaking device to disconnect the bus bar. Therefore, it is necessary to prevent the leakage of high-pressure gas, and the part where the excitation source is in contact with and fixed to the housing also needs to be sealed.

[0043] An arc extinguishing fuse 12 is connected in parallel with the bus bar 10. Both ends of the fuse 12 are located outside both ends of the pre-breaking port of the bus bar. The resistance of the fuse 12 is much higher than that of the bus bar 10. In this way, it can be ensured that under normal current-carrying conditions, almost all of the current flows through the bus bar, and only when the bus bar is disconnected, the current will flow through the fuse 12. The fuse 12 is arranged in the arc extinguishing medium, and a plurality of necks are arranged on the fuse 12, and the necks of the fuse 12 are located in the arc extinguishing medium. The arc extinguishing medium is filled in the arc extinguishing chamber, which is located on one side of the displacement direction after the bus bar is disconnected. By arranging the fuse in the arc extinguishing chamber filled with the arc extinguishing medium, a fuse structure connected in parallel with the bus bar is formed. The fuse 12 can be melted and fused by heat, or after the breaking device disconnects the bus bar, the breaking device disconnects the fuse 12. Or, a displacement channel is arranged in the arc extinguishing medium, the fuse 12 passes through the displacement channel, and a fuse cutter is arranged in the displacement channel. After the breaking device disconnects the bus bar, it drives the displacement of the fuse cutter, and the fuse 12 is mechanically disconnected by the fuse cutter.

[0044] The shunt 13 is a manganese copper alloy resistance type shunt. The shunt 13 is connected in series with the bus bar 10. The series connection methods include: the shunt 13 is connected in series at the output end of the bus bar 10, or is wrapped between the input end and the output end of the bus bar 10, or is wrapped at the pre-breaking port of the bus bar, or directly exists as the pre-breaking port of the bus bar 10, forming a series connection with the input end and the output end of the bus bar 10. The shunt 13 is used to monitor the current and voltage changes of the main circuit connected in series with the bus bar.

[0045] A temperature sensor 14 is arranged on the surface of the bus bar 10 for real-time monitoring of the temperature change of the bus bar 10.

[0046] A power semiconductor switch device 15 and an electric control switch 16 are also connected in series on the busbar 10. The power semiconductor switch device 15 is an IGBT power semiconductor switch device or a SiC power semiconductor switch device, and is a normally open switch device. IGBT devices are still an affordable option in applications with relatively low frequencies and less stringent power requirements, while SiC devices have obvious advantages in applications with high frequencies, high temperatures, and high efficiency.

[0047] The electric control switch 16 is a closed relay and is a normally open switch device.

[0048] When the main circuit needs to be powered on and conducted, the control system at the user end sends a power-on signal to the control circuit. The control circuit controls the electric control switch 16 and the power semiconductor switch device 15 to close according to the received power-on signal, conducts the main circuit, and enables the main circuit to conduct current normally. When conducting the main circuit, it is preferred that the control circuit first controls the electric control switch 16 to close, and then controls the power semiconductor switch device 15 to close and conduct, improving the safety performance when the main circuit is conducted.

[0049] When the main circuit needs to be completely disconnected, such as during maintenance and discharging, the control system at the user end sends a disconnection signal to the control circuit. The control circuit controls the electric control switch 16 or the power semiconductor switch device 15 to disconnect according to the received disconnection signal, disconnects the main circuit. Preferably, the control circuit controls the power semiconductor switch device 15 to disconnect to disconnect the main circuit.

[0050] The control circuit 17 is used to overall control the electric control protection unit of the present invention. The control circuit 17 is integrated in the electric control protection unit or arranged at the user end. In this embodiment, the control circuit 17 uses a PCB control board and is integrated in the electric control protection unit. The control circuit 17 is respectively connected to the shunt 13, the temperature sensor 14, the excitation source, the power semiconductor switch device 15, and the electric control switch 16. The shunt 13 and the temperature sensor 14 send the monitored current information and temperature information of the main circuit to the control circuit. The control circuit 17 makes judgments based on the collected current information, temperature information, etc. and the set thresholds. According to different judgment results, that is, different operating conditions, different control signals are output to control the excitation source, the power semiconductor switch device 15, or the electric control switch 16 corresponding to the operating conditions to act and perform the breaking of the main circuit. When the control circuit 17 is integrated in the circuit protection unit, the control circuit 17 can be connected to each component by wired connection, or the control circuit 17 can be wirelessly connected to the power semiconductor switch device 15 and the excitation source in the excitation module, and wired connected to the shunt 13, the temperature sensor 14, and the electric control switch 16.

[0051] When making a judgment, the control circuit compares the current signal sent by the shunt with the set current threshold. When it is less than the set current threshold, it is judged as normal current and the control circuit 17 does not act; when it is greater than the set current threshold, it is judged as abnormal current. After it is determined as abnormal current, it is further judged which abnormal current range the abnormal current belongs to according to the set abnormal current range, and the control circuit decides the control signal to be output according to the abnormal current range to which the abnormal current belongs. In the present invention, the abnormal current range is set as a small fault current range and a large fault current range. The normal current, the small fault current range, and the large fault current range form the full current breaking range for the circuit protection unit to break. When the control circuit makes a judgment based on the received current signal, it also makes a judgment based on the received temperature signal.

[0052] Generally, when the current increases, the temperature of the main circuit also increases. Moreover, the temperature of the main circuit is also affected by the ambient temperature. For example, the normal ambient temperatures in winter and summer are quite different, resulting in a large difference in the normal temperature of the main circuit. Therefore, the control signal output by the control circuit is mainly based on the collected current signal for judgment, and the temperature signal collected by the temperature sensor is used as an auxiliary judgment. The set temperature threshold is generally the temperature that will be generated on the main circuit when the current exceeds the upper limit value of the large fault current range. When the temperature detected by the temperature sensor exceeds the set temperature threshold, the control circuit outputs a control signal. In this way, the control circuit outputs a control signal according to the temperature signal, which can break the main circuit in the case of abnormal temperature rise of the main circuit caused by fire or the like, making the protection range of the main circuit protection unit wider and applicable to more scenarios.

[0053] The settings for general working conditions are divided into four types: on-off required under normal current flow, breaking required under small fault current, breaking under large fault current greater than small fault current, and breaking when the temperature is abnormal. Each working condition is judged by the control circuit based on the collected current signal and temperature signal.

[0054] In the present invention, when the main circuit needs to be powered on, or when the main circuit needs to be broken during normal current flow, a control signal is sent from the control system at the user end to the control circuit 17, and then the control circuit 17 outputs a control signal. The control circuit outputs a control signal according to the working condition. See Figure 2 :

[0055] When the main circuit needs to be powered on and started, the control system at the user end sends a power-on signal to the control circuit 17, and the control circuit 17 controls the electric control switch 16 and the power semiconductor switch device 15 to close simultaneously or sequentially ( Figure 2 not shown in the figure) according to the received power-on signal to start the main circuit, and the main circuit has normal current flow;

[0056] When the main circuit needs to be disconnected during normal current flow, the control system at the user end sends a disconnection signal to control circuit 17. Control circuit 17 then controls the power semiconductor switch device 15 to disconnect according to the received disconnection signal, disconnecting the main circuit. After the main circuit is disconnected, the electric control switch 16 also disconnects accordingly.

[0057] When it is judged as a small fault current, control circuit 17 controls the electric control switch 16 to disconnect, disconnecting the main circuit. After the main circuit is disconnected, the power semiconductor switch device 15 also disconnects accordingly.

[0058] When it is judged as a large fault current or abnormal temperature, control circuit 17 sends a trigger signal to the excitation source of the excitation source fuse, controls the excitation source to act, releases the driving force to drive the interrupting device to cut off the conductive bar of the excitation source fuse, and cuts off the main circuit.

[0059] Among them, in addition to being controlled by the control circuit, the excitation source can also receive a trigger signal from outside the electric control protection unit, that is, the trigger signal sent by the control system at the user end. For example, when it is necessary to cut off the main circuit under zero current, the excitation source receives the external trigger signal and acts to cut off the conductive bar. Zero current cut-off is for some special situations, such as in the case of power-off due to small fault current. In order to prevent subsequent unsafe situations or emergencies, power-off protection is carried out. For example, in the application environment of the product, when the vehicle is flooded and power-off occurs.

[0060] In practical applications, the control circuit can increase the judgment response time. For example, when the current is within a certain value range, it can be set that within a certain time, such as within 2s, whether the collected current signal always maintains that value. If it always maintains, the control result is output. If the current only exists for a moment and then tends to be normal, the control circuit does not act and does not output a control signal. However, when the collected current signal exceeds the highest warning value, at this time, the corresponding control signal is directly output to avoid damage to the main circuit. Therefore, the judgment response time is set based on the principle of not causing damage to the equipment and instruments in the main circuit. When it will cause damage, there is no need to set the judgment response time.

[0061] In the present invention, for the structure part of the excitation fuse, that is, the structure and positional relationship of each structure such as the excitation source, the interrupting device, the conductive bar 10, the fuse link 12, the arc extinguishing chamber filled with arc extinguishing medium, the fuse link cutter, etc., the existing structure and positional relationship of the excitation fuse can be adopted, and the electric control switch and the power semiconductor switch device are coordinated to make appropriate adjustments to the structural positional relationship to make the overall structure compact and small in volume.

[0062] In other embodiments, multiple conductive bars may be provided. When multiple conductive bars are provided, they are insulated and arranged in a staggered manner. A shunt, a power semiconductor switching device, and an electric control switch are connected in series on each conductive bar. Multiple conductive bars may share one interrupting device, but the number of impact ends of the interrupting device is the same as the number of conductive bars. The impact ends of the interrupting device are arranged in a staggered manner and correspond to the conductive bars one by one. The fuses connected in parallel to the conductive bars and the arc extinguishing chambers filled with arc extinguishing media may be arranged around the outer periphery of the displacement path of the interrupting device. In this way, the existing space can be fully utilized, making the structure more compact and the volume smaller.

Claims

1. An electric control protection unit with integrated excitation fuse, characterized in that: It includes a control circuit, and a power semiconductor switch device, an excitation fuse, and an electric control switch connected in series in sequence; The excitation fuse includes an excitation module and a conductive bar, the excitation module includes an excitation source and an interrupting device, the conductive bar is connected in series with the power semiconductor switch device and the electric control switch; a shunt for collecting electrical signals on the conductive bar is connected in series with the conductive bar; The excitation source, the electric control switch, the shunt, and the power semiconductor switch device are respectively connected to the control circuit, and the power semiconductor switch device and the electric control switch are normally open devices; When the main circuit needs to be turned on, the control circuit controls the electric control switch to close and the power semiconductor switch device to turn on according to the received external control signal, so that the main circuit is turned on; when the main circuit needs to be disconnected in the normal current flow state, the control circuit controls the electric control switch or the power semiconductor switch device to turn off according to the received external control signal, so as to disconnect the main circuit; When the main circuit is in the flow state, the control circuit outputs different control signals according to the electrical signal monitored by the shunt to respectively control the actions of the excitation source, the electric control switch and the power semiconductor switch device: When the main circuit current is a small fault current, the control circuit controls the electric control switch to disconnect, and the main circuit is disconnected; When the main circuit current is a large fault current, the control circuit controls the excitation source to operate, drives the interrupting device to disconnect the conductive bus, and the main circuit is disconnected.

2. The electric control protection unit according to claim 1, characterized in that: When the main circuit needs to be turned on, the control circuit controls the electric control switch to close, and then controls the power semiconductor switch device to turn on, so that the main circuit is turned on.

3. The electric control protection unit according to claim 1, characterized in that: A temperature sensor is also provided on the conductive bar, and the temperature sensor is connected to the control circuit. When the temperature is abnormal, the control circuit controls the excitation source to operate.

4. The electric control protection unit according to claim 1, characterized in that: The control circuit is integrated in the electric control protection unit, and the control circuit is a PCB control board.

5. The electric control protection unit according to claim 1, characterized in that: The shunt is a manganese copper resistor shunt, which is wrapped around the conductive bar portion between the input end and the output end of the conductive bar and connected in series with the conductive bar, or is connected in series with the conductive bar as the portion of the conductive bar that needs to be disconnected, or is connected in series with the output end of the conductive bar.

6. The electric control protection unit according to claim 1, characterized in that: The power semiconductor switch device is an IGBT device or a SiC semiconductor power switch device.

7. The electric control protection unit according to claim 1, characterized in that: The electric control switch is a closed relay.

8. The electric control protection unit according to claim 1, characterized in that: The conductive bar is connected in parallel with an arc extinguishing fuse, and both ends of the fuse are respectively connected to the conductive bar parts outside the two ends of the conductive bar parts to be disconnected; the fuse is passed through the arc extinguishing medium, and a plurality of narrow necks are arranged on the fuse.

9. The electric control protection unit according to any one of claims 1 to 8, characterized in that: The excitation source can also receive an external trigger signal to drive the interruption device to disconnect the conductive bar and the main circuit.

10. The electric control protection unit according to any one of claims 1 to 8, characterized in that: The control loop is connected to the excitation source and the power semiconductor switch device wirelessly or by wire.

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