High-voltage connector and power supply device

Abstract

A high-voltage connector and a power supply device are used for realizing safe power-off of equipment. The high-voltage connector comprises a first connecting part provided with a first power pin module and a first signal pin module, and a second connecting part provided with a second power pin module and a second signal pin module, and the first connecting part and the second connecting part are connected in a plugging manner; the first end of the first power pin module is connected with a first power supply through the switch module, and the second end is connected with the first end of the second power pin module; the first end of the first signal pin module is connected with the driving circuit of the switch module, and the second end of the first signal pin module is connected with the first end of the second signal pin module; the length of a signal contact pin in the first signal contact pin module is smaller than that of a power contact pin in the first power contact pin module; the second end of the second pin module is used for being connected with a load, and the second ends of all signal pins in the second pin module are directly connected; and the length of a signal contact pin in the second signal contact pin module is smaller than that of a power contact pin in the second power contact pin module.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a high-voltage connector and power supply device. Background Technology

[0002] With the widespread application of high-voltage power systems, high-voltage connectors play a crucial role in power transmission and distribution. They are used to connect and disconnect high-voltage cables, ensuring the normal operation of power systems. However, safety when operating high-voltage connectors remains a critical concern for the power industry.

[0003] In high-voltage power systems, the safe disconnection method for high-voltage connectors is crucial. Directly disconnecting the main circuit electrical connection by plugging and unplugging the high-voltage connector poses significant safety hazards. For example, it is impossible to effectively prevent the generation of electric arcs during the power disconnection process, leading to equipment damage or the risk of electric shock to personnel. Especially when the high-voltage connector is disconnected, failure to effectively control the arc and current can pose a serious threat to operators and equipment. Utility Model Content

[0004] This application provides a high-voltage connector and a power supply device for safely disconnecting equipment and protecting the equipment.

[0005] In a first aspect, embodiments of this application provide a high-voltage connector that can be applied in high-voltage power supply scenarios and used to achieve safe power-off of equipment. The high-voltage connector includes at least a first connecting portion and a second connecting portion. The first connecting portion is provided with a first power pin module and a first signal pin module, and the second connecting portion is provided with a second power pin module and a second signal pin module. The first connecting portion and the second connecting portion are pluggable / pluggable.

[0006] Specifically, the first end of the first power pin module is used to connect to the first power source through the switch module, the second end of the first power pin module is connected to the first end of the second power pin module, the first end of the first signal pin module is used to connect to the drive circuit of the switch module, the second end of the first signal pin module is connected to the first end of the second signal pin module, and the length of the signal pin in the first signal pin module is less than the length of the power pin in the first power pin module; the second end of the second power pin module is used to connect to the load, the second ends of all signal pins in the second signal pin module are directly connected, and the length of the signal pin in the second signal pin module is less than the length of the power pin in the second power pin module.

[0007] With the above design, the first power supply and load are generally set on two different PCBs. The electrical connection between the two PCBs can be achieved by controlling the plugging and unplugging of the first and second connectors. When the first and second connectors are plugged in, since the length of the signal pin in the first signal pin module is less than the length of the power pin in the first power pin module, the power pin in the first power pin module connects first to close the main circuit, and then the signal pin in the first signal pin module connects to supply power to the drive circuit, thereby driving the switch module to close. That is, by setting the length difference between the power pin and the signal pin, a delayed power-on is achieved. The main circuit is closed only after the high-voltage connector connection is stable, thus achieving a safe connection of the high-voltage connector. When the first connection part is disconnected from the second connection part, since the length of the signal pin in the first signal pin module is less than the length of the power pin in the first power pin module, the signal pin in the first signal pin module disconnects first. The switch module disconnects the connection of the high-power main circuit due to the power failure of the drive circuit, and the power pin in the first power pin module disconnects later. This also realizes the disconnection of the high-power main circuit by the low-power device. Since the power failure of the high-power main circuit is controlled by a non-direct plugging and unplugging method, the generation of electric arc is avoided, and the safety of the main circuit is ensured.

[0008] In one possible design, the first signal pin module includes a first signal pin and a second signal pin.

[0009] Specifically, the first end of the first signal pin is connected to the driving circuit of the switch module, and the second end of the first signal pin is connected to the second signal pin module; the first end of the second signal pin is connected to the driving circuit of the switch module, and the second end of the second signal pin is connected to the second signal pin module. The first ends of the first signal pin and the first ends of the second signal pin constitute the first end of the first signal pin module, and the second ends of the first signal pin and the second ends of the second signal pin constitute the second end of the first signal pin module.

[0010] In one possible design, the second signal pin module includes a third signal pin and a fourth signal pin.

[0011] Specifically, the first end of the third signal pin is connected to the second end of the first signal pin, and the second end of the third signal pin is connected to the second end of the fourth signal pin; the first end of the fourth signal pin is connected to the second end of the second signal pin. The first ends of the third and fourth signal pins constitute the first end of the second signal pin module, and the second ends of the third and fourth signal pins constitute the second end of the second signal pin module.

[0012] In one possible design, the first power connector module includes a first power connector corresponding to each phase line connected to the first power supply, and the second power connector module includes a second power connector corresponding to each power port of the load. The number of first power connectors in the first power connector module is the same as the number of second power connectors in the second power connector module.

[0013] In one possible design, the first connection is located on the first PCB board where the first power supply is located, and the second connection is located on the second PCB board where the load is located.

[0014] Secondly, embodiments of this application provide a power supply device, which includes a first power supply, a switching module, a drive circuit, and a high-voltage connector provided in the first aspect of embodiments of this application and any possible design thereof.

[0015] The first power source is connected to the high-voltage connector via the switch module; the high-voltage connector is connected to the drive circuit; and the drive circuit is connected to the switch module to control the closing and closing of the switch module.

[0016] In one possible design, the switching module includes multiple relays or multiple switching transistors.

[0017] In one possible design, the drive circuit includes a second power supply, which is connected to the control terminal of the switching transistor in the switching module or the coil of the relay via the first signal pin module.

[0018] In one possible design, the power supply device further includes a timer, through which the second power supply is connected to the first signal pin module. The output of the timer is connected to the control terminal of the switching transistor in the switching module. With this design, after the signal pins in the first and second signal pin modules are connected, the timer delays for a period of time before driving the switching module to conduct, thus achieving the main circuit electrical connection. Therefore, power can be applied only when the first and second power pin modules are connected and securely connected, avoiding safety issues caused by poor contact between the first and second power pin modules.

[0019] In one possible design, the power supply device further includes a time-delay relay. The second power supply is connected to the first signal pin module via the time-delay relay, and the time-delay contact of the time-delay relay is connected between the second power supply and the coil of the relay in the switching module. With this design, after the signal pins in the first and second signal pin modules are connected, the time-delay relay is energized and then delays for a period of time before driving the switching module to conduct, thus achieving the main circuit electrical connection. Therefore, power can be applied only when the first and second power pin modules are connected and securely connected, avoiding safety issues caused by poor contact between the first and second power pin modules.

[0020] In one possible design, the power supply device further includes a mechanical switch connected between the second power source and the first signal pin module. With this design, since the connection status of the high-voltage connector automatically controls the connection sequence of the high-voltage connector, a mechanical switch, such as a push-button switch, is configured to manually disconnect the main circuit connection to prevent the main circuit connection from failing to be disconnected in time due to line faults. When the operator discovers a line fault, they can press the push-button switch to stop the drive signal of the triggering switch or control the relay coil to be energized, thereby disconnecting the main circuit connection and protecting the system's safety.

[0021] Furthermore, the technical effects of the second aspect and any of its possible designs can be found in the technical effects of different designs in the first aspect of the embodiments of this application, and will not be repeated here. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of a high-voltage connector provided in this application embodiment. Figure 1 ;

[0024] Figure 2 A schematic diagram of the structure of a high-voltage connector provided in this application embodiment. Figure 2 ;

[0025] Figure 3 A connection diagram of a high-voltage connector provided in this application embodiment. Figure 1 ;

[0026] Figure 4 A connection diagram of a high-voltage connector provided in this application embodiment. Figure 2 ;

[0027] Figure 5 A connection diagram of a high-voltage connector provided in this application embodiment. Figure 3 ;

[0028] Figure 6 A schematic diagram of the insertion of a first connecting part and a second connecting part provided in an embodiment of this application. Figure 1 ;

[0029] Figure 7 A schematic diagram of the insertion of a first connecting part and a second connecting part provided in an embodiment of this application. Figure 2 ;

[0030] Figure 8 A connection diagram of a high-voltage connector provided in this application embodiment. Figure 4 ;

[0031] Figure 9 A connection diagram of a high-voltage connector provided in this application embodiment. Figure 5 ;

[0032] Figure 10 A connection diagram of a high-voltage connector provided in this application embodiment. Figure 6 ;

[0033] Figure 11 A connection diagram of a high-voltage connector provided in this application embodiment. Figure 7 ;

[0034] Figure 12 A connection diagram of a high-voltage connector provided in this application embodiment. Figure 8 . Detailed Implementation

[0035] The application scenarios of the technical solutions in the embodiments of this application will be described below with reference to the accompanying drawings.

[0036] The high-voltage connector provided in this application embodiment can be applied to high-voltage power supply systems. Generally, the power supply and the load are located on different PCB boards. The high-voltage connector can realize the electrical connection between the two PCB boards, thereby realizing the connection between the power supply and the load.

[0037] See Figure 1 The diagram shown is a structural schematic of a high-voltage connector provided in an embodiment of this application. Figure 1As shown, the high-voltage connector includes a first connecting part and a second connecting part. The first connecting part is provided with a first power pin module and a first signal pin module, and the second connecting part is provided with a second power pin module and a second signal pin module. The first connecting part can be fixed to a first PCB board where the first power supply is located, and the second connecting part can be fixed to a second PCB board where the load is located. The first and second connecting parts are pluggable.

[0038] Specifically, the first end of the first power pin module is used to connect to the first power source through the switch module, the second end of the first power pin module is connected to the first end of the second power pin module, the first end of the first signal pin module is used to connect to the drive circuit of the switch module, the second end of the first signal pin module is connected to the first end of the second signal pin module, and the length of the signal pin in the first signal pin module is less than the length of the power pin in the first power pin module; the second end of the second power pin module is used to connect to the load, the second ends of all signal pins in the second signal pin module are directly connected, and the length of the signal pin in the second signal pin module is less than the length of the power pin in the second power pin module.

[0039] It should be noted that, depending on the application scenario of the high-voltage connector, the first power supply can be either a DC power supply or an AC power supply. For example, the first power supply can be a three-phase AC power supply that outputs three-phase AC power, or it can be a DC bus that transmits DC power. The number of power pins in the first power pin module can be configured according to the phase lines connected to the first power supply. For example, when the first power supply is a three-phase AC power supply and uses a three-phase three-wire system to transmit three-phase AC power, the first power pin module can include power pins connected one-to-one with each phase line.

[0040] In practical applications, the first connecting part and the second connecting part can be fixed on the first PCB board where the first power supply is located and the second PCB board where the load is located, respectively. The second end of the first power pin module and the second end of the first signal pin module can serve as the external interface of the first connecting part, and the first end of the second power pin module and the first end of the second signal pin module can serve as the external interface of the second connecting part. The first connecting part and the second connecting part can achieve plug-in connection through the above-mentioned external interfaces.

[0041] In one possible implementation, the first connecting part and the first PCB board can also be connected by a plug-in method, that is, the first PCB board is provided with a base that is pluggably connected to the first end of the first power pin module and the first end of the first signal pin module. Similarly, the second connecting part and the second PCB board can also be connected by a pluggable method, that is, the second PCB board is provided with a base that is pluggably connected to the second end of the second power pin module and the second end of the second signal pin module.

[0042] use Figure 1 The high-voltage connector shown, when the first connecting part and the second connecting part are inserted, since the length of the signal pin in the first signal pin module is less than the length of the power pin in the first power pin module, and the length of the signal pin in the second signal pin module is less than the length of the power pin in the second power pin module, the first power pin module and the switch module are connected first to achieve the closure of the high-power main circuit. The drive circuit of the first signal pin module and the switch module is then connected, thereby driving the switch module to close and achieve the electrical connection of the main circuit. By using the difference in pin length to achieve the delayed drive of the main circuit electrical connection, it is ensured that the high-voltage connector is firmly connected before power is applied, thus achieving a safe connection of the equipment. When the first connection part is disconnected from the second connection part, since the length of the signal pin in the first signal pin module is less than the length of the power pin in the first power pin module, and the length of the signal pin in the second signal pin module is less than the length of the power pin in the second power pin module, the first signal pin module disconnects from the drive circuit first. The drive circuit controls the switch module to disconnect the electrical connection of the main circuit. The first power pin module then disconnects the connection of the main circuit that no current is flowing through. Because the power-off of the switch module is achieved by using the difference in pin length, rather than directly plugging and unplugging the high-voltage connector to disconnect the power, the generation of an electric arc on the high-voltage connector ensures the safe power-off of the system.

[0043] The following section, in conjunction with the structure of the high-voltage connector, details the process by which the high-voltage connector achieves the closure and opening of the main circuit.

[0044] In practical use, since the switching control device of the switching module is generally powered by DC, the first signal pin module includes a first signal pin a1 and a second signal pin a2, and the second signal pin module includes a third signal pin a3 and a fourth signal pin a4.

[0045] Specifically, see Figure 2As shown, the first end of the first signal pin a1 is connected to the drive circuit of the switch module, and the second end of the first signal pin a1 is connected to the second signal pin module. The first end of the second signal pin a2 is connected to the drive circuit of the switch module, and the second end of the second signal pin a2 is connected to the second signal pin module. The first end of the third signal pin a3 is connected to the second end of the first signal pin a1, and the second end of the third signal pin a3 is connected to the second end of the fourth signal pin a4. The first end of the fourth signal pin a4 is connected to the second end of the second signal pin a2. The first ends of the first and second signal pins a1 and a2 constitute the first end of the first signal pin module, and the second ends of the first and second signal pins a2 constitute the second end of the first signal pin module. The first ends of the third and fourth signal pins a3 and a4 constitute the first end of the second signal pin module, and the second ends of the third and fourth signal pins a4 constitute the second end of the second signal pin module.

[0046] In actual use, the first power pin module includes a first power pin that corresponds to each phase line connected to the first power supply, and the second power pin module includes a second power pin that corresponds to each power port of the load. The number of first power pins in the first power pin module is the same as the number of second power pins in the second power pin module.

[0047] It should be noted that, since the number of power pins configured for the high-voltage connector varies when it is connected to different power sources, in order to facilitate understanding of the scheme claimed in this application, a specific example of the high-voltage connector is given, taking a three-phase AC power source as the first power source.

[0048] See Figure 3 The diagram shown illustrates a structure where the first power source connected to the high-voltage connector is a three-phase AC power source. Figure 3 As shown, the ports of the three-phase AC power supply for outputting phase A, phase B, and phase C AC power are connected to the switching module via phase lines L1 to L3, respectively. The first power pin module includes three first power pins b1 to b3 for connecting the phase lines, and the second power pin module includes three second power pins b4 to b6 for connecting to the load power port. The switching module is connected to the first ends of the three first power pins b1 to b3. The first end of the first signal pin a1 is connected to the positive terminal of the second power supply VCC via the coil of relay KM, and the first end of the second signal pin a2 is connected to the negative terminal of the second power supply VCC. The second ends of the three second power pins b4 to b6 are connected to the three power ports of the load, respectively. The second ends of the third signal pin a3 and the fourth signal pin a4 are directly connected.

[0049] It should be noted that, Figure 3The high-voltage connector connection diagram shown is illustrated using three pairs of normally open contacts of the same relay as an example. For practical applications, please refer to [the diagram / reference needed]. Figure 4 As shown, the above-mentioned switch module can also use a pair of normally open contacts of three different relays. The switch module can also use other devices with switching functions, for example, see [reference needed]. Figure 5 As shown, the switching module can use three industry-standard switching transistors S1 to S3. At this time, the second power supply VCC is connected to the first end of the first signal pin a1, and the control terminal of the aforementioned switching transistor is connected to the first end of the second signal pin a2.

[0050] It should be noted that, Figure 3 The high-voltage connector connection diagram shown is illustrated using the example of a drive circuit including a second power supply VCC. In actual applications, other commonly used drive topologies in the industry can also be selected for the drive circuit, which will not be discussed in detail here.

[0051] use Figure 3 The high-voltage connector shown has a shorter signal pin than the power pin. Therefore, when the first connector and the second connector are plugged in, see [reference needed]. Figure 6 As shown, the power pins b1-b3 and b4-b5 in the first and second connecting parts are connected first to close the main circuit. At this time, the signal pins are still in the open state. After the power pins in the first and second connecting parts are securely connected, refer to... Figure 7 As shown, the two signal pins a1-a2 in the first connection part are connected to the two signal pins a3-a4 in the second connection part. At this time, the second power supply VCC supplies power to the coil of relay KM. After relay KM is energized, its main contacts close to realize the electrical connection between the three-phase AC power supply and the load, thereby supplying power to the load. Since the power pins corresponding to the main circuit are connected first, and the switch in the switching module closes later, the poor contact caused by unstable power pin connection can be effectively avoided.

[0052] See also Figure 3 As shown, since the length of the signal pin is shorter than the length of the power pin, when the first connection part is disconnected from the second connection part, the connection state of the first connection part and the second connection part remains as shown. Figure 6 As shown, the signal pins a1 to a2 in the first connection part and the signal pins a3 to a4 in the second connection part are disconnected first. At this time, the power supply path of the relay KM coil is disconnected, and the relay KM power-off control switch module disconnects the connection between the three-phase AC power supply and the first connection part, thereby disconnecting the main circuit. This avoids the high-voltage connector from being directly plugged in and unplugged to disconnect the power, ensuring the safe power-off of the system.

[0053] In practical applications, to ensure the main circuit can be safely disconnected in case of a fault, see [reference needed]. Figure 8As shown, a mechanical switch K1, such as a push-button switch, can be installed between the second power supply VCC and the signal pin in the first connection part. When a system fault is detected, the operator can use the mechanical switch K1 to control the switch module to disconnect the main circuit, thereby protecting the safety of the system.

[0054] See Figures 2-8 The high-voltage connector shown primarily achieves delay by configuring different lengths for the power pins and signal pins, thereby enabling safe connection and safe power-off. To prevent instantaneous voltage fluctuations or instability during connector insertion, delay devices can also be configured to further increase the delay time.

[0055] In one example, the delay device can be a timer, see [link to example]. Figure 9 As shown, the second power supply VCC is connected to the first signal pin module via a timer T. The output of the timer is connected to the control terminals of the switching transistors s1 to s3 in the switching module. When the first connection part is connected to the signal pin in the second connection part, the timer is powered on and starts timing. When the timing period arrives, the timer outputs a control signal of the corresponding level to the control terminal of the switching transistor, thereby driving the switching transistor to conduct and thus realizing the electrical connection of the main circuit.

[0056] In another example, the delay device can be a time-delay relay KT, see [reference needed]. Figure 10 As shown, the second power supply VCC is connected to the first signal pin module via a time-delay relay KT. The time-delay contact of the time-delay relay KT is connected between the second power supply VCC and the coil of the relay KM in the switching module. When the first connection part is connected to the signal pin in the second connection part, the coil of the time-delay relay KT is energized. When the delay time of the time-delay relay KT is reached, the time-delay contact closes, energizing the relay KM connected to the main circuit, thereby realizing the electrical connection of the main circuit.

[0057] It should be noted that the timing time of the timer or the delay time of the delay relay can be configured according to the application scenario of the high voltage connector. For example, the delay time can be set to several milliseconds to tens of milliseconds to meet the stability requirements under different working conditions.

[0058] The above describes the structure of the high-voltage connector when the primary power source is a three-phase AC power supply, along with a connection diagram. In practical applications, the high-voltage connector can also be used in power supply systems that utilize different power sources. For example, see [link to relevant documentation]. Figure 11 and Figure 12 The diagram shows the structure and connection of the high-voltage connector when the first power supply is a different type of DC power supply. Of course, the first power supply can also be a different type of power supply commonly used in the industry, and this application does not impose any restrictions here.

[0059] Based on the same concept, embodiments of this application also provide a power supply device, which includes a first power supply, a switching module, a drive circuit, and the aforementioned high-voltage connector.

[0060] Specifically, the first power supply is connected to the high-voltage connector via the switching module; the high-voltage connector is connected to the drive circuit; and the drive circuit is connected to the switching module to control the closing and closing of the switching module.

[0061] In one possible implementation, the switching module includes multiple relays or multiple switching transistors.

[0062] In one possible implementation, the drive circuit includes a second power supply, which is connected to the control terminal of the switching transistor in the switching module or the coil of the relay via a first signal pin module.

[0063] In one possible implementation, the power supply device further includes a timer, the second power supply is connected to the first signal pin module through the timer, and the output of the timer is connected to the control terminal of the switching transistor in the switching module.

[0064] In one possible implementation, the power supply device further includes a time-delay relay, through which the second power supply is connected to the first signal pin module, and the time-delay contact of the time-delay relay is connected between the second power supply and the coil of the relay in the switching module.

[0065] In one possible implementation, the power supply device also includes a mechanical switch connected between the second power source and the first signal pin module.

[0066] It should be noted that the structure and connection method of each component in the power supply device can be found in the aforementioned relevant descriptions, and will not be repeated here.

[0067] In the various embodiments of this application, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of different embodiments are consistent and can be referenced by each other. The technical features of different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0068] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the scope of protection of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A high-voltage connector, characterized in that, include: A first connecting part is provided with a first power pin module and a first signal pin module, and a second connecting part is provided with a second power pin module and a second signal pin module, wherein the first connecting part and the second connecting part are plugged in and plugged out. The first end of the first power pin module is used to connect to the first power source through the switch module. The second end of the first power pin module is connected to the first end of the second power pin module. The first end of the first signal pin module is used to connect to the drive circuit of the switch module. The second end of the first signal pin module is connected to the first end of the second signal pin module. The length of the signal pin in the first signal pin module is less than the length of the power pin in the first power pin module. The second end of the second power pin module is used to connect to the load. The second ends of all signal pins in the second signal pin module are directly connected. The length of the signal pins in the second signal pin module is less than the length of the power pins in the second power pin module.

2. The high-voltage connector according to claim 1, characterized in that, The first signal pin module includes a first signal pin and a second signal pin; The first end of the first signal pin is used to connect to the drive circuit of the switch module, and the second end of the first signal pin is connected to the second signal pin module. The first end of the second signal pin is used to connect to the drive circuit of the switch module, and the second end of the second signal pin is connected to the second signal pin module. Wherein, the first end of the first signal pin and the first end of the second signal pin constitute the first end of the first signal pin module, and the second end of the first signal pin and the second end of the second signal pin constitute the second end of the first signal pin module.

3. The high-voltage connector according to claim 2, characterized in that, The second signal pin module includes a third signal pin and a fourth signal pin; The first end of the third signal pin is connected to the second end of the first signal pin, and the second end of the third signal pin is connected to the second end of the fourth signal pin; The first end of the fourth signal pin is connected to the second end of the second signal pin; Wherein, the first end of the third signal pin and the first end of the fourth signal pin constitute the first end of the second signal pin module, and the second end of the third signal pin and the second end of the fourth signal pin constitute the second end of the second signal pin module.

4. The high-voltage connector according to claim 1, characterized in that, The first power connector module includes a first power connector that corresponds one-to-one with each phase line connected to the first power source, and the second power connector module includes a second power connector that corresponds one-to-one with each power port of the load. The number of first power connectors in the first power connector module is the same as the number of second power connectors in the second power connector module.

5. The high-voltage connector according to any one of claims 1 to 4, characterized in that, The first connection part is located on the first PCB board where the first power supply is located, and the second connection part is located on the second PCB board where the load is located.

6. A power supply device, characterized in that, Includes a first power supply, a switching module, a drive circuit, and a high-voltage connector as described in any one of claims 1 to 5; The first power source is connected to the high-voltage connector via the switching module; The high-voltage connector is connected to the drive circuit; The driving circuit is connected to the switching module and is used to control the closing and closing of the switching module.

7. The power supply device according to claim 6, characterized in that, The switching module includes multiple relays or multiple switching transistors.

8. The power supply device according to claim 7, characterized in that, The driving circuit includes a second power supply, which is connected to the control terminal of the switching transistor in the switching module or the coil of the relay through the first signal pin module.

9. The power supply device according to claim 8, characterized in that, The power supply device further includes a timer, the second power supply is connected to the first signal pin module through the timer, and the output terminal of the timer is connected to the control terminal of the switching transistor in the switching module.

10. The power supply device according to claim 8, characterized in that, The power supply device also includes a time delay relay. The second power supply is connected to the first signal pin module through the time delay relay. The time delay contact of the time delay relay is connected between the second power supply and the coil of the relay in the switching module.

11. The power supply device according to any one of claims 8 to 10, characterized in that, The power supply device also includes a mechanical switch connected between the second power source and the first signal pin module.

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