Dual-power-supply switching device and power supply equipment

Abstract

The utility model discloses a dual power supply switching device and power supply equipment. The dual power supply switching device comprises a first power supply detection module, a second power supply detection module, a first switch module, a second switch module and a third switch module, the first power supply detection module is respectively connected with the second power supply detection module and the third switch module; the third switch module is respectively connected with the first switch module and the second switch module; the second switch module is connected with the second power supply detection module; the first switch module is connected with the first power supply detection module; the first power detection module is used for detecting the state of a first power supply. The second power detection module is used for detecting the state of a second power supply. And the first switch module, the second switch module and the third switch module are used for selectively switching on a power supply in a normal state in the first power supply and the second power supply through switching on and off states of the switch. According to the utility model, the probability that the switch module is burnt out can be reduced, the failure rate of the double-circuit power supply switching device is reduced, and the power supply stability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply equipment, in particular to a dual power supply switching device and power supply equipment. Background Art

[0002] In the power system, equipment with high power requirements usually adopts dual power supply. Dual power supply means that a load has two power supplies, and the two power supplies can be switched. In the event of power failure of one power supply, it can be switched to the other power supply. The two power supplies in the dual power supply can be switched through a dual power supply switching device. In the related art, the dual power supply switching device is composed of multiple contactors. When the voltage of the connected power supply exceeds the voltage that the contactor coil can withstand, the contactor coil is prone to burn out, resulting in a high failure rate of the dual power supply switching device, affecting the stability of power supply. Utility Model Content

[0003] The main purpose of the utility model is to provide a dual power switching device and power supply equipment, aiming to at least partially solve the technical problem in the related technology that when the connected power voltage exceeds the voltage that the contactor coil can withstand, the contactor coil is easily burned out, resulting in a high failure rate of the dual power supply switching device and affecting the power supply stability.

[0004] According to one aspect of an embodiment of the present application, there is provided a dual power switching device, including a first power detection module, a second power detection module, a first switch module, a second switch module and a third switch module;

[0005] The first power detection module is connected to the second power detection module and the third switch module respectively; the third switch module is connected to the first switch module and the second switch module respectively; the second switch module is connected to the second power detection module; the first switch module is connected to the first power detection module;

[0006] The first power supply detection module is used to detect the state of the first power supply, and the second power supply detection module is used to detect the state of the second power supply; the first switch module, the second switch module and the third switch module are used to select and connect the power supply in the normal state between the first power supply and the second power supply by switching the on and off states of the switches.

[0007] In some embodiments of the present application, the first switch module includes a first switch control coil, a first normally closed contact switch and four first normally open contact switches; each of the first normally open contact switches is respectively arranged on the first phase line, the second phase line, the third phase line and the neutral line of the first power supply, the first end of the first switch control coil is connected to the first power supply detection module, and the second end of the first switch control coil is connected to the third switch module.

[0008] In some embodiments of the present application, the second switch module includes a second switch control coil, a second normally closed contact switch and four second normally open contact switches; each of the second normally open contact switches is respectively arranged on the first phase line, the second phase line, the third phase line and the neutral line of the second power supply, the first end of the second switch control coil is connected to the second power supply detection module, and the second end of the second switch control coil is connected to the third switch module.

[0009] In some embodiments of the present application, the third switch module includes a third switch control coil, a third normally closed contact switch and a third normally open contact switch; the first end of the third switch control coil is connected to the first power supply detection module, the second end of the third switch control coil is connected to the neutral line of the first power supply, the first end of the third normally open contact switch is connected to the first switch module, the second end of the third normally open contact switch is connected to the second switch module, the first end of the third normally closed contact switch is connected to the first switch module, and the second end of the third normally closed contact switch is connected to the second switch module.

[0010] In some embodiments of the present application, any one of the first power supply detection module and the second power supply detection module includes a main control chip, and a switching power supply circuit, a switch connection circuit and three phase line adjustment circuits respectively connected to the main control chip, an input end of the switching power supply circuit is connected to the input end of the first phase line adjustment circuit among the three phase line adjustment circuits, a first output end of the switching power supply circuit is connected to the first phase line adjustment circuit, and a second output end of the switching power supply circuit is connected to the main control chip; the switch connection circuit of the first power supply detection module is respectively connected to the first switch control coil of the first switch module and the third switch control coil of the third switch module, and the switch connection circuit of the second power supply detection module is connected to the second switch control coil of the second switch module.

[0011] In some embodiments of the present application, any one of the three phase line adjustment circuits includes a step-down circuit and a signal amplification circuit connected in sequence, the step-down circuit is connected to a power supply, and the signal amplification circuit is connected to the main control chip.

[0012] In some embodiments of the present application, the main control chip includes a micro control unit.

[0013] In some embodiments of the present application, the dual power switching device further includes a controller, and the controller is respectively connected to the first power detection module, the second power detection module, the first switch module, and the second switch module.

[0014] In some embodiments of the present application, any one of the first switch module, the second switch module and the third switch module is a contactor or a relay.

[0015] According to another aspect of an embodiment of the present application, a power supply device is provided, comprising a first power supply, a second power supply, and a dual power supply switching device according to any embodiment of the present application.

[0016] In the technical solution of the utility model, the first power supply detection module is used to detect the state of the first power supply, the second power supply detection module is used to detect the state of the second power supply, the first switch module, the second switch module and the third switch module are used to select and connect the power supply in normal state between the first power supply and the second power supply by switching the on and off states of the switches, and the switch module can be disconnected in time when the connected power supply voltage exceeds the voltage that the switch module can withstand, thereby reducing the probability of the switch module being burned out, reducing the failure rate of the dual-circuit power supply switching device, and improving the power supply stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 This is a structural block diagram of a dual power switching device according to an embodiment of the present application.

[0019] Figure 2 This is a schematic structural diagram of a dual power switching device according to another embodiment of the present application.

[0020] Figure 3 This is a schematic structural diagram of a dual power switching device according to another embodiment of the present application.

[0021] Figure 4 This is a schematic diagram of the structure of a power detection module in one embodiment of the present application.

[0022] Figure 5 This is a schematic diagram of the structure of a power detection module in another embodiment of the present application.

[0023] Figure 6 This is a structural block diagram of a power supply device according to an embodiment of the present application.

[0024] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] Three-phase four-wire power supply is widely used in power systems. The three-phase four-wire system is used to provide three AC power supplies with phases 120 degrees apart. The four lines in the three-phase four-wire system represent phase A, phase B, phase C and neutral line N (if the neutral point on the power supply side of the circuit is grounded, the neutral line is also called the zero line).

[0031] In the related technology, the dual-circuit power supply switching device is composed of multiple contactors. When the neutral line of the power supply is connected incorrectly, the coil is powered by the phase voltage instead of the line voltage, and the contactor coil is easily burned out; when the power supply voltage exceeds the voltage that the contactor coil can withstand, the contactor coil is also easily burned out.

[0032] In view of the technical problem that when the connected power supply voltage exceeds the withstand voltage of the contactor coil in the dual-circuit power supply system in the related art, the contactor coil is easily burned out, resulting in a high failure rate of the dual-circuit power supply switching device and affecting the power supply stability, the embodiment of the present application provides a dual-circuit power supply switching device, including a first power supply detection module, a second power supply detection module, a first switch module, a second switch module and a third switch module, the first power supply detection module is connected to the second power supply detection module and the third switch module respectively, the third switch module is connected to the first switch module and the second switch module respectively, the first switch module is connected to the first power supply detection module, the second switch module is connected to the second power supply detection module, the first power supply detection module is used to detect the state of the first power supply, and the second power supply detection module is used to detect the state of the second power supply; the first switch module, the second switch module and the third switch module are used to select and connect the power supply in normal state between the first power supply and the second power supply by switching the on and off states of the switches, and can disconnect the switch module in time when the connected power supply voltage exceeds the withstand voltage of the switch module, thereby reducing the probability of the switch module being burned out, reducing the failure rate of the dual-circuit power supply switching device, and improving the power supply stability.

[0033] refer to Figure 1 As shown, an embodiment of the present application provides a dual power switching device, including a first power detection module, a second power detection module, a first switch module, a second switch module and a third switch module.

[0034] The first power detection module is connected to the second power detection module and the third switch module respectively, the third switch module is connected to the first switch module and the second switch module respectively, the first switch module is connected to the first power detection module, and the second switch module is connected to the second power detection module.

[0035] The first power supply detection module is used to detect the state of the first power supply, and the second power supply detection module is used to detect the state of the second power supply; the first switch module, the second switch module and the third switch module are used to select and connect the power supply in the normal state between the first power supply and the second power supply by switching the on and off states of the switches.

[0036] In some embodiments, the first switch module includes a first switch control coil, a first normally closed contact switch and four first normally open contact switches; each first normally open contact switch is respectively arranged on the first phase line, the second phase line, the third phase line and the neutral line of the first power supply, the first end of the first switch control coil is connected to the first power supply detection module, and the second end of the first switch control coil is connected to the third switch module.

[0037] Exemplarily, the second switch module includes a second switch control coil, a second normally closed contact switch and four second normally open contact switches; each second normally open contact switch is respectively arranged on the first phase line, the second phase line, the third phase line and the neutral line of the second power supply, the first end of the second switch control coil is connected to the second power supply detection module, and the second end of the second switch control coil is connected to the third switch module.

[0038] In one embodiment, the third switch module includes a third switch control coil, a third normally closed contact switch and a third normally open contact switch; the first end of the third switch control coil is connected to the first power supply detection module, the second end of the third switch control coil is connected to the neutral line of the first power supply, the first end of the third normally open contact switch is connected to the first switch module, the second end of the third normally open contact switch is connected to the second switch module, the first end of the third normally closed contact switch is connected to the first switch module, and the second end of the third normally closed contact switch is connected to the second switch module.

[0039] In some embodiments, any one of the first power supply detection module and the second power supply detection module includes a main control chip, and a switching power supply circuit, a switch connection circuit and three phase line adjustment circuits respectively connected to the main control chip, the input end of the switching power supply circuit is connected to the input end of the first phase line adjustment circuit among the three phase line adjustment circuits, the first output end of the switching power supply circuit is connected to the first phase line adjustment circuit, and the second output end of the switching power supply circuit is connected to the main control chip; the switch connection circuit of the first power supply detection module is respectively connected to the first switch control coil of the first switch module and the third switch control coil of the third switch module, and the switch connection circuit of the second power supply detection module is connected to the second switch control coil of the second switch module.

[0040] Exemplarily, any one of the three phase line adjustment circuits includes a step-down circuit and a signal amplification circuit connected in sequence, the step-down circuit is connected to a power supply, and the signal amplification circuit is connected to a main control chip.

[0041] Specifically, the main control chip includes a micro control unit.

[0042] In one embodiment, the dual power switching device further includes a controller, which is connected to the first power detection module, the second power detection module, the first switch module, and the second switch module respectively.

[0043] In some embodiments, any one of the first switch module, the second switch module and the third switch module is a contactor or a relay.

[0044] refer to Figure 2 As shown, in a specific example, the dual power switching device includes a first power detection module 100 , a second power detection module 200 , a first switch module 1 , a second switch module 2 and a third switch module 3 .

[0045] In this example, the first switch module 1 includes a first switch control coil KM1, a first normally closed contact switch 15 and four first normally open contact switches, which are respectively marked as a first normally open contact switch 11, a first normally open contact switch 12, a first normally open contact switch 13 and a first normally open contact switch 14; each first normally open contact switch is respectively arranged on the first phase line L11, the second phase line L12, the third phase line L13 and the neutral line N1 of the first power supply, the first end of the first switch control coil KM1 is connected to the first power supply detection module 100, and the second end of the first switch control coil KM1 is connected to the third switch module 3.

[0046] Specifically, in the first power supply, the first phase line L11 is an A-phase line, the second phase line L12 is a B-phase line, and the third phase line L13 is a C-phase line.

[0047] In this example, the second switch module 2 includes a second switch control coil KM2, a second normally closed contact switch 25 and four second normally open contact switches, which are respectively marked as the second normally open contact switch 21, the second normally open contact switch 22, the second normally open contact switch 23 and the second normally open contact switch 24; each second normally open contact switch is respectively arranged on the first phase line L21, the second phase line L22, the third phase line L23 and the neutral line N2 of the second power supply, the first end of the second switch control coil KM2 is connected to the second power supply detection module 200, and the second end of the second switch control coil KM2 is connected to the third switch module 3.

[0048] Specifically, in the second power supply, the first phase line L21 is an A-phase line, the second phase line L22 is a B-phase line, and the third phase line L23 is a C-phase line.

[0049] In this example, the third switch module 3 includes a third switch control coil KM3, a third normally closed contact switch 32 and a third normally open contact switch 31; the first end of the third switch control coil KM3 is connected to the first power supply detection module 100, the second end of the third switch control coil KM3 is connected to the neutral line N1 of the first power supply, the first end of the third normally open contact switch 31 is connected to the first switch module 1, the second end of the third normally open contact switch 31 is connected to the second switch module 2, the first end of the third normally closed contact switch 32 is connected to the first switch module 1, and the second end of the third normally closed contact switch 32 is connected to the second switch module 2.

[0050] Specifically, a switch unit 101 is provided in the first power detection module 100, a first end of the first switch control coil KM1 is connected to a first end of the switch unit 101 in the first power detection module 100 through a fuse FU1, and a second end of the switch unit 101 in the first power detection module 100 is connected to a neutral line N1 of the first power supply. A first end of the third switch control coil KM3 is connected to a first end of the switch unit 101 in the first power detection module 100 through a fuse FU1. A second end of the first switch control coil KM1 is connected to a second end of the third switch control coil KM3.

[0051] The second power supply detection module 200 is provided with a switch unit 201, the first end of the second switch control coil KM2 is connected to the first end of the switch unit 201 in the second power supply detection module 200 through the fuse FU2, and the second end of the switch unit 201 is connected to the first phase line L21 of the second power supply. The first end of the third normally closed contact switch 32 in the third switch module 3 is connected to the first end of the first normally closed contact switch 15. The second end of the first normally closed contact switch 15 is connected to the neutral line N2 of the second power supply. The second end of the second switch control coil KM2 is connected to the second end of the third normally closed contact switch 32.

[0052] The second end of the third switch control coil KM3 is connected to the neutral line N1 of the first power supply and the neutral line N2 of the second power supply respectively. The first end of the third normally open contact switch 31 is connected to the second end of the first switch control coil KM1 in the first switch module 1, the second end of the third normally open contact switch 31 is connected to the first end of the second normally closed contact switch 25 in the second switch module 2, and the second end of the second normally closed contact switch 25 in the second switch module 2 is connected to the second end of the third switch control coil KM3.

[0053] When the switch QS1 of the first power supply and the switch QS2 of the second power supply are closed, the first power supply detection module 100 detects whether the first power supply has phase loss, phase mismatch, over-voltage or under-voltage, etc. The second power supply detection module 200 detects whether the second power supply has phase loss, phase mismatch, over-voltage or under-voltage, etc. If phase loss, phase mismatch, over-voltage or under-voltage, etc. are detected, the power supply state is determined to be abnormal. If the power supply is detected to be normal, the normally open contact switch is closed, the third switch control coil KM3 is energized to close, so that the first switch control coil KM1 is energized to close, and the second switch control coil KM2 is disconnected.

[0054] When the switch QS1 of the first power source is opened and the switch QS2 of the second power source is closed, the third switch control coil KM3 is opened, so that the first switch control coil KM1 is opened and the second switch control coil KM2 is energized and closed. When the switch QS1 of the first power source is closed again, the third switch control coil KM3 is energized and closed again, so that the first switch control coil KM1 is energized and closed and the second switch control coil KM2 is opened.

[0055] The first power detection module 100 and the second power detection module 200 are interconnected and can supply power to each other. When one power detection module loses power, the other power detection module can still detect the power failure, thereby increasing the probability of the power detection function working normally. In the case of a first power supply failure, the first power detection module 100 can also detect the cause of the power failure; in the case of a second power supply failure, the second power detection module 200 can also detect the cause of the power failure.

[0056] For some examples, see Figure 3 As shown, the dual power switching device may further include a controller, which is respectively connected to the first power detection module 100, the second power detection module 200, the first switch module 1, and the second switch module 2. The first power detection module 100 and the second power detection module 200 communicate with the controller respectively, so that the user can query (local query or remote query) the power failure type. When a power failure is detected, the power detection module can send a prompt message to the controller.

[0057] refer to Figure 4As shown, in this example, any one of the first power supply detection module 100 and the second power supply detection module 2 includes a main control chip, and a switching power supply circuit, a switch connection circuit and three phase line adjustment circuits respectively connected to the main control chip, the input end of the switching power supply circuit is connected to the input end of the first phase line adjustment circuit among the three phase line adjustment circuits, the first output end of the switching power supply circuit is connected to the first phase line adjustment circuit, and the second output end of the switching power supply circuit is connected to the main control chip; the switch connection circuit of the first power supply detection module is respectively connected to the first switch control coil of the first switch module and the third switch control coil of the third switch module, and the switch connection circuit of the second power supply detection module is connected to the second switch control coil of the second switch module.

[0058] The switching power supply circuit can also be used to connect another power supply detection module.

[0059] refer to Figure 5 As shown, in some examples, any one of the first power supply detection module 100 and the second power supply detection module 2 may also include a communication circuit and a switch module connection circuit. The main control chip is connected to the controller through the communication circuit to achieve communication with the controller. The switch module connection circuit is used to connect the coils in each switch module.

[0060] The three-phase line voltages of phase A, phase B and phase C of the power supply are input to the main control chip after voltage reduction and signal amplification, and the main control chip obtains the voltage of each phase after A / D conversion. At the same time, by detecting the zero-crossing point of the sine wave signal of each phase power supply, the time interval between the zero-crossing points of the two phases is obtained.

[0061] If the power supply detection module detects that the power supply voltage exceeds the preset voltage value range, the power supply detection module will issue an overvoltage or undervoltage fault prompt signal. If it is detected that at least one phase voltage is lower than the preset threshold, a phase loss fault prompt signal is issued. If the zero-crossing time intervals of phase A→phase B→phase C→phase A are consistent, it means that the phase sequence is correct, otherwise it means that the power supply has a phase error fault, and a phase error fault prompt signal is issued.

[0062] In the dual power supply system in the related art, when switching the second power supply, due to the fast switching action, if the neutral line of the second power supply is connected incorrectly, the load will be powered by line voltage instead of phase voltage, and the load will be easily burned. In the embodiment of the present application, when the first power supply detection module and the second power supply detection module detect that there is a problem with the corresponding power supply, they will control the disconnection of the corresponding switch module, thereby greatly reducing the probability of damage to the switch module or the load, and improving the safety and stability of the power supply system. The dual power switching device of the embodiment of the present application can disconnect the corresponding switch module in the event of a power failure such as a wrong connection of the power supply N line, power overvoltage or power switching, thereby greatly reducing the probability of the coil in the switch module being burned.

[0063] refer to Figure 6 As shown, another embodiment of the present application provides a power supply device, including a first power supply, a second power supply and a dual power supply switching device of any embodiment of the present application. The dual power supply switching device is connected to the first power supply and the second power supply respectively.

[0064] Specifically, the first power detection module in the dual power switching device is connected to the first power supply, and the second power detection module is connected to the second power supply.

[0065] The power supply equipment provided in the embodiment of the present application includes the dual power switching device provided in any embodiment of the present application, and thus can achieve the same beneficial effects as the dual power switching device provided in any embodiment of the present application.

[0066] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the concept of the utility model, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A dual power switching device, characterized in that: It includes a first power supply detection module, a second power supply detection module, a first switch module, a second switch module and a third switch module; The first power detection module is connected to the second power detection module and the third switch module respectively; the third switch module is connected to the first switch module and the second switch module respectively; the second switch module is connected to the second power detection module; the first switch module is connected to the first power detection module; The first power supply detection module is used to detect the state of the first power supply, and the second power supply detection module is used to detect the state of the second power supply; the first switch module, the second switch module and the third switch module are used to select and connect the power supply in the normal state between the first power supply and the second power supply by switching the on and off states of the switches.

2. The dual power switching device according to claim 1, characterized in that: The first switch module includes a first switch control coil, a first normally closed contact switch and four first normally open contact switches; each of the first normally open contact switches is respectively arranged on the first phase line, the second phase line, the third phase line and the neutral line of the first power supply, the first end of the first switch control coil is connected to the first power supply detection module, and the second end of the first switch control coil is connected to the third switch module.

3. The dual power switching device according to claim 1, characterized in that: The second switch module includes a second switch control coil, a second normally closed contact switch and four second normally open contact switches; each of the second normally open contact switches is respectively arranged on the first phase line, the second phase line, the third phase line and the neutral line of the second power supply, the first end of the second switch control coil is connected to the second power supply detection module, and the second end of the second switch control coil is connected to the third switch module.

4. The dual power switching device according to claim 1, characterized in that: The third switch module includes a third switch control coil, a third normally closed contact switch and a third normally open contact switch; the first end of the third switch control coil is connected to the first power supply detection module, the second end of the third switch control coil is connected to the neutral line of the first power supply, the first end of the third normally open contact switch is connected to the first switch module, the second end of the third normally open contact switch is connected to the second switch module, the first end of the third normally closed contact switch is connected to the first switch module, and the second end of the third normally closed contact switch is connected to the second switch module.

5. The dual power switching device according to any one of claims 1 to 4, characterized in that: Any one of the first power detection module and the second power detection module includes a main control chip, and a switching power supply circuit, a switch connection circuit and three phase line adjustment circuits respectively connected to the main control chip, the input end of the switching power supply circuit is connected to the input end of the first phase line adjustment circuit among the three phase line adjustment circuits, the first output end of the switching power supply circuit is connected to the first phase line adjustment circuit, and the second output end of the switching power supply circuit is connected to the main control chip; the switch connection circuit of the first power detection module is respectively connected to the first switch control coil of the first switch module and the third switch control coil of the third switch module, and the switch connection circuit of the second power detection module is connected to the second switch control coil of the second switch module.

6. The dual power switching device according to claim 5, characterized in that: Any phase line adjustment circuit of the three phase line adjustment circuits comprises a step-down circuit and a signal amplification circuit connected in sequence, the step-down circuit is connected to a power supply, and the signal amplification circuit is connected to the main control chip.

7. The dual power switching device according to claim 5, characterized in that: The main control chip includes a micro control unit.

8. The dual power switching device according to any one of claims 1 to 4, characterized in that: The dual power switching device further includes a controller, which is respectively connected to the first power detection module, the second power detection module, the first switch module, and the second switch module.

9. The dual power switching device according to any one of claims 1 to 4, characterized in that: Any one of the first switch module, the second switch module and the third switch module is a contactor or a relay.

10. A power supply device, characterized in that: It comprises a first power supply, a second power supply and a dual power supply switching device according to any one of claims 1 to 9.

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