Power switching circuit and power system

Abstract

The utility model discloses a power supply switching circuit and a power system. The power supply switching circuit comprises a first power supply module, a second power supply module, a switching module, an interlocking module and a control module. The interlocking module is used for outputting a switching signal based on the voltage of the first power supply module, the control module is used for outputting a control signal based on the voltage of the second power supply module, and the control signal is used for controlling the interlocking module to stop outputting the switching signal; and the switching module is used for controlling the second power supply module to be connected with the rear-end load under the condition that the switching signal is not received, and controlling the first power supply module to be connected with the rear-end load under the condition that the switching signal is received. Through the interlocking module and the control module, the switching module can be controlled according to the voltage conditions of the first power supply module and the second power supply module, and automatic switching of the power supplies after power failure of the dual power supplies can be realized.

Description

Technical Field

[0001] The present application belongs to the field of power supply technology, and in particular, relates to a power supply switching circuit and a power system. Background Art

[0002] Currently, conventional power transfer switches include automatic transfer switches (ATS) and static transfer switches (STS). However, the automatic transfer switch has a problem of long power switching time, while the static transfer switch has a problem of large size and high cost. Utility Model Content

[0003] The purpose of the present application is to provide a power switching circuit and a power system, aiming to solve the problem of incompatible performance and cost existing in traditional power switching switches.

[0004] A first aspect of an embodiment of the present application provides a power switching circuit, which includes a first power supply module, a second power supply module, a switching module, an interlocking module and a control module; the first input end of the switching module is connected to the first power supply module, the second input end of the switching module is connected to the second power supply module, and the output end of the switching module is used to connect to a rear-end load; the first end of the interlocking module is connected to the first power supply module, the second end of the interlocking module is connected to the switching module, the first end of the control module is connected to the second power supply module, and the second end of the control module is connected to the interlocking module; the interlocking module is used to output a switching signal based on the voltage of the first power supply module, and the control module is used to output a control signal based on the voltage of the second power supply module, and the control signal is used to control the interlocking module to stop outputting the switching signal; the switching module is used to control the second power supply module to be connected to the rear-end load if the switching signal is not received, and to control the first power supply module to be connected to the rear-end load if the switching signal is received.

[0005] In one embodiment, the interlocking module includes a first switch unit and a second switch unit; the first end of the first switch unit is connected to the first power supply module, and the second end of the first switch unit is connected to the switching module; the first end of the second switch unit is connected to the control module, and the second end of the second switch unit is connected to the first end of the first switch unit; the first switch unit is used to turn on and output the switching signal when the voltage of the first power supply module is within a first voltage range; the second switch unit is used to control the first switch unit to turn off when receiving the control signal.

[0006] In one embodiment, the first switch unit includes a first photoelectric coupler, and the second switch unit includes a second photoelectric coupler. The positive pole of the light emitter of the first photoelectric coupler and the first end of the light receiver of the first photoelectric coupler are both connected to the first end of the first power supply module, the negative pole of the light emitter of the first photoelectric coupler is connected to the second end of the first power supply module, the second end of the light receiver of the first photoelectric coupler is connected to the first control end of the switching module, and the second control end of the switching module is connected to the negative pole of the light emitter of the first photoelectric coupler; the positive pole of the light emitter of the second photoelectric coupler and the negative pole of the light emitter of the second photoelectric coupler are both connected to the control module, the first end of the light receiver of the second photoelectric coupler is connected to the positive pole of the light emitter of the first photoelectric coupler, and the second end of the light receiver of the second photoelectric coupler is connected to the negative pole of the light emitter of the first photoelectric coupler.

[0007] In one embodiment, the control module includes a third switch unit; the first end of the third switch unit is connected to the second power supply module, and the second end of the third switch unit is connected to the interlocking module; the third switch unit is used to turn on and output the control signal when the voltage of the second power supply module is within the second voltage range.

[0008] In one embodiment, the third switch unit includes a third photoelectric coupler and a first switch device; the positive electrode of the light emitter of the third photoelectric coupler is connected to the first end of the second power supply module, the negative electrode of the light emitter of the third photoelectric coupler is connected to the second end of the second power supply module, the first end of the optical receiver of the third photoelectric coupler is respectively connected to the control end of the first switch device, the first end of the first switch device is connected to the first working power supply, the second end of the first switch device is connected to the positive electrode of the light emitter of the second photoelectric coupler, and the negative electrode of the light emitter of the second photoelectric coupler and the second end of the optical receiver of the third photoelectric coupler are both grounded.

[0009] In one embodiment, the control module also includes a main control unit; the main control unit is respectively connected to the first power supply module, the second power supply module and the third switch unit; the main control unit is used to control the third switch unit to stop outputting the control signal based on the voltage of the first power supply module and the voltage of the second power supply module.

[0010] In one embodiment, the main control unit includes a controller and a second switching device; the first end of the second switching device is connected to the positive electrode of the light emitter of the second photoelectric coupler, the second end of the second switching device is grounded, and the control end of the second switching device is connected to the controller; the controller is used to control the second switching device to turn on when the voltage of the first power supply module is within the first voltage range.

[0011] In one embodiment, the main control unit also includes a first voltage transformer and a second voltage transformer; the first input end of the first voltage transformer is connected to the first end of the first power supply module, the second input end of the first voltage transformer is connected to the second end of the first power supply module, and the first output end of the first voltage transformer is connected to the first input end of the controller; the first input end of the second voltage transformer is connected to the first end of the second power supply module, the second input end of the second voltage transformer is connected to the second end of the second power supply module, the first output end of the second voltage transformer is connected to the second input end of the controller, and the second output end of the second voltage transformer and the second output end of the first voltage transformer are both grounded.

[0012] In one embodiment, the switching module includes a relay; the first end of the coil of the relay is connected to the second end of the light receiver of the first photocoupler, and the second end of the coil of the relay is connected to the negative pole of the light emitter of the first photocoupler; the normally closed contact of the relay is connected to the second power supply module, the normally open contact of the relay is connected to the first power supply module, and the common end of the relay is connected to the rear-end load.

[0013] A second aspect of an embodiment of the present application provides a power system, comprising the power switching circuit as described above.

[0014] Compared with the prior art, the embodiments of the present application have the following beneficial effects: the switching module can be controlled according to the voltage conditions of the first power supply module and the second power supply module through the interlocking module and the control module. Specifically, the interlocking module is used to output a switching signal based on the voltage of the first power supply module, and the control module is used to output a control signal based on the voltage of the second power supply module, and the control signal is used to control the interlocking module to stop outputting the switching signal. The switching module is used to control the second power supply module to be connected to the rear-end load when the switching signal is not received, and to control the first power supply module to be connected to the rear-end load when the switching signal is received, thereby realizing automatic switching of the power supply after the dual power supply is powered off. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a power switching circuit provided in an embodiment of the present application;

[0016] Figure 2 An exemplary circuit schematic diagram of a power switching circuit provided in an embodiment of the present application;

[0017] Figure 3 Another exemplary circuit schematic diagram of a power switching circuit provided in an embodiment of the present application;

[0018] Figure 4 Another exemplary circuit schematic diagram of a power switching circuit provided in an embodiment of the present application;

[0019] Figure 5 A schematic diagram of the structure of an electric power system provided in one embodiment of the present application. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0021] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] Figure 1 A schematic diagram of the structure of a power switching circuit provided by an embodiment of the present application is shown. For the sake of convenience, only the parts related to the present embodiment are shown, which are described in detail as follows:

[0024] The power switching circuit 10 includes a first power supply module 100 , a second power supply module 200 , a switching module 300 , an interlocking module 400 and a control module 500 .

[0025] The first input end of the switching module 300 is connected to the first power supply module 100, the second input end of the switching module 300 is connected to the second power supply module 200, and the output end of the switching module 300 is connected to the rear-end load 20. The first end of the interlocking module 400 is connected to the first power supply module 100, and the second end of the interlocking module 400 is connected to the switching module 300. The first end of the control module 500 is connected to the second power supply module 200, and the second end of the control module 500 is connected to the interlocking module 400.

[0026] The interlocking module 400 is used to output a switching signal based on the voltage of the first power supply module 100 , and the control module 500 is used to output a control signal based on the voltage of the second power supply module 200 , and the control signal is used to control the interlocking module 400 to stop outputting the switching signal.

[0027] The switching module 300 is used to control the second power supply module 200 to be connected to the rear-end load 20 when no switching signal is received, and to control the first power supply module 100 to be connected to the rear-end load 20 when a switching signal is received.

[0028] The interlocking module 400 and the control module 500 can control the switching module 300 according to the voltage output conditions of the first power supply module 100 and the second power supply module 200, so as to realize automatic power-off switching of the dual power supplies.

[0029] It can be understood that the first power supply module 100 and the second power supply module 200 can be connected to different power supplies respectively, and when the power supply and the corresponding power supply module are working normally, the first power supply module 100 and the second power supply module 200 can provide power to the rear-end load 20. The power supply connected to the first power supply module 100 and the second power supply module 200 can be a DC power supply, such as an energy storage device such as a battery, or an AC power supply, such as an AC power supply such as a power grid.

[0030] In one embodiment, the interlock module 400 includes a first switch unit 410 and a second switch unit 420 .

[0031] The first end of the first switch unit 410 is connected to the first power supply module 100, and the second end of the first switch unit 410 is connected to the switching module 300. The first end of the second switch unit 420 is connected to the control module 500, and the second end of the second switch unit 420 is connected to the first end of the first switch unit 410.

[0032] The first switch unit 410 is used to turn on and output a switching signal when the voltage of the first power supply module 100 is within the first voltage range. The second switch unit 420 is used to control the first switch unit 410 to turn off when receiving a control signal. The first voltage range can be set according to actual needs. For example, the minimum threshold of the first voltage range can be set according to the minimum supply voltage of the back-end load 20, so that the minimum threshold of the first voltage range is not less than the minimum supply voltage of the back-end load 20.

[0033] It can be understood that in this embodiment, when the interlocking module 400 does not receive a control signal and the voltage of the first power supply module 100 is within the first voltage range, the first switch unit 410 will be in an on state to output a switching signal. The switching signal can control the switching module 300 to connect the first power supply module 100 with the rear-end load 20, and the first power supply module 100 will supply power to the rear-end load 20.

[0034] In one embodiment, if Figure 2 As shown, the first switch unit 410 includes a first photocoupler U1 , the second switch unit 420 includes a second photocoupler U2 , the first switch unit 410 also includes a first resistor R1 and a second resistor R2 , and the switch module 300 includes a relay K1 .

[0035] The first end of the first resistor R1 is connected to the first end V1+ of the first power supply module 100, and the second end of the first resistor R1 is respectively connected to the first end of the second resistor R2, the positive electrode of the light emitter of the first photocoupler U1, and the first end of the light receiver of the first photocoupler U1. The negative electrode of the light emitter of the first photocoupler U1 is connected to the second end V1- of the first power supply module 100 and the second end of the second resistor R2, the second end of the light receiver of the first photocoupler U1 is connected to the first end of the coil L1 of the relay K1, and the second end of the coil L1 of the relay K1 is connected to the negative electrode of the light emitter of the first photocoupler U1. The positive electrode of the light emitter of the second photocoupler U2 and the negative electrode of the light emitter of the second photocoupler U2 are both connected to the third switch unit 510, the first end of the light receiver of the second photocoupler U2 is connected to the positive electrode of the light emitter of the first photocoupler U1, and the second end of the light receiver of the second photocoupler U2 is connected to the negative electrode of the light emitter of the first photocoupler U1.

[0036] In one embodiment, if Figure 2 As shown, the first switch unit 410 further includes a capacitor C1, a first end of the capacitor C1 is connected to the positive electrode of the light emitter of the first photocoupler U1, and a second end of the capacitor C1 is connected to the negative electrode of the light emitter of the first photocoupler U1.

[0037] It can be understood that when the first power supply module 100 is operating normally, the voltage output by the first power supply module 100 will be divided by the first resistor R1 and the second resistor R2, and the voltage applied to the light emitter of the first photocoupler U1 is equal to the voltage applied to the second resistor R2. When the voltage applied to the light emitter of the first photocoupler U1 is greater than the conduction threshold of the first photocoupler U1, the optical receiver of the first photocoupler U1 is turned on, and then the coil of the relay K1 is powered (i.e., the switching signal is transmitted to the switching module 300), thereby controlling the conduction state of the switching module 300. In this embodiment, the conduction threshold of the first photocoupler U1 is the first voltage range.

[0038] At the same time, the control module 500 can control the conduction of the optical receiver of the second photocoupler U2 by outputting a control signal, so that the positive and negative electrodes of the light emitter of the first photocoupler U1 are short-circuited, and the electrical energy on the capacitor C1 is quickly released, thereby quickly turning off the optical receiver of the first photocoupler U1. At this time, the interlocking module 400 stops outputting the switching signal, and finally the switching module 300 disconnects the first power supply module 100 from the rear-end load 20 and connects the second power supply module 200 to the rear-end load 20, thereby achieving the effect of automatically switching to another power supply when the power supply is powered off.

[0039] In some embodiments, the operating voltage of the coil of the relay K1 is 110V, the operating / release time of the relay K1 is 6ms to 8ms, and the load current of the contacts of the relay K1 is 16A.

[0040] In some embodiments, the maximum receiving voltage of the first photocoupler U1 and the second photocoupler U2 is 300V.

[0041] In one embodiment, if Figure 2 As shown, the control module 500 includes a third switch unit 510 .

[0042] The first end of the third switch unit 510 is connected to the second power supply module 200, and the second end of the third switch unit 510 is connected to the interlocking module 400. The third switch unit 510 is used to turn on and output a control signal when the voltage of the second power supply module 200 is within the second voltage range. The second voltage range can be set according to actual needs. For example, the minimum threshold of the second voltage range can be set according to the minimum supply voltage of the rear-end load 20, so that the minimum threshold of the second voltage range is not less than the minimum supply voltage of the rear-end load 20.

[0043] It can be understood that in this embodiment, when the voltage of the first power supply module 100 is within the first voltage range and the voltage of the second power supply module 200 is within the second voltage range, the third switch unit 510 is turned on and outputs a control signal. When the interlocking module 400 receives the control signal, the second switch unit 420 will be turned on and control the first switch unit 410 to be turned off to stop outputting the switching signal. The switching module 300 that has not received the switching signal connects the second power supply module 200 to the rear-end load 20, and the second power supply module 200 supplies power to the rear-end load 20.

[0044] Therefore, the third switch unit 510 can control the second power supply module 200 to supply power to the rear-end load 20 when the voltage of the first power supply module 100 is within the first voltage range and the voltage of the second power supply module 200 is within the second voltage range. At this time, if the second power supply module 200 or the power supply connected to the second power supply module 200 fails and cannot work normally, so that the voltage of the second power supply module 200 is not within the second voltage range, the third switch unit 510 turns off and stops outputting the control signal, and the interlocking module 400 works without receiving the control signal, and controls the switching module 300 accordingly. For example, the first power supply module 100 can be controlled to be connected to the rear-end load 20 according to the voltage of the first power supply module 100, thereby achieving the effect of automatic power-off switching of the dual power supplies.

[0045] In one embodiment, if Figure 2 As shown, the third switch unit 510 includes a third photocoupler U3, a first switch device Q1, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6.

[0046] The first end of the third resistor R3 is connected to the first end V2+ of the second power supply module 200, the second end of the third resistor R3 is connected to the positive electrode of the light emitter of the third photoelectric coupler U3, the negative electrode of the light emitter of the third photoelectric coupler U3 is connected to the second end V2- of the second power supply module 200, the first end of the optical receiver of the third photoelectric coupler U3 is respectively connected to the first end of the fourth resistor R4 and the control end of the first switch device Q1, the first end of the first switch device Q1 is respectively connected to the first working power supply V3 and the second end of the fourth resistor R4, the second end of the first switch device Q1 is connected to the first end of the fifth resistor R5, the second end of the fifth resistor R5 is respectively connected to the first end of the sixth resistor R6 and the positive electrode of the light emitter of the second photoelectric coupler U2, the second end of the sixth resistor R6, the negative electrode of the light emitter of the second photoelectric coupler U2 and the second end of the optical receiver of the third photoelectric coupler U3 are all grounded. Among them, the third resistor R3 can limit the current.

[0047] Exemplarily, in some embodiments, the first switch device Q1 is a PNP transistor.

[0048] It can be understood that when the voltage of the second power supply module 200 is within the second voltage range, the voltage of the second power supply module 200 will turn on the optical receiver of the third photocoupler U3, thereby controlling the first switch device Q1 to turn on. After the voltage is divided by the fifth resistor R5 and the sixth resistor R6, a voltage will be applied to the light emitter of the second photocoupler U2 (i.e., the control signal is transmitted to the interlocking module 400), so that the optical receiver of the second photocoupler U2 is turned on. After the optical receiver of the second photocoupler U2 is turned on, the two ends of the light emitter of the first photocoupler U1 will be short-circuited, and the optical receiver of the first photocoupler U1 will not be turned on, and finally the effect of controlling the interlocking module 400 to stop outputting the switching signal is achieved. When the voltage of the second power supply module 200 is not within the second voltage range, the optical receiver of the third photocoupler U3 and the first switch device Q1 cannot be turned on, and the third switch unit 510 cannot output the control signal. The interlocking module 400 works without receiving a control signal and performs corresponding control on the switching module 300. For example, the first power supply module 100 can be controlled to be connected to the rear-end load 20 according to the voltage of the first power supply module 100, thereby achieving the effect of automatic power-off switching of dual power supplies.

[0049] In one embodiment, if Figure 2 As shown, the control module 500 also includes a main control unit 520. The main control unit 520 is respectively connected to the first power supply module 100, the second power supply module 200 and the third switch unit 510. The main control unit 520 is used to control the third switch unit 510 to stop outputting the control signal based on the voltage of the first power supply module 100 and the voltage of the second power supply module 200.

[0050] When the first power supply module 100 and the second power supply module 200 are both supplying power normally, the main control unit 520 can control the third switch unit 510 according to actual needs. For example, when the first power supply module 100 and the second power supply module 200 are both supplying power normally, the main control unit 520 can control the third switch unit 510 to stop outputting the control signal, and when the interlocking module 400 does not receive the control signal and the voltage of the first power supply module 100 is within the first voltage range, the first switch unit 410 will be in the on state to output the switching signal, and the switching signal can control the switching module 300 to connect the first power supply module 100 with the rear-end load 20, and the first power supply module 100 supplies power to the rear-end load 20.

[0051] When the first power supply module 100 and the second power supply module 200 are both supplying power normally, the main control unit 520 can control the third switch unit 510 to output a control signal. When the interlocking module 400 receives the control signal, the second switch unit 420 can control the first switch unit 410 to shut down to stop outputting the switching signal, so that the switching module 300 connects the second power supply module 200 to the rear-end load 20, and the second power supply module 200 supplies power to the rear-end load 20.

[0052] In one embodiment, if Figure 2 As shown, the main control unit 520 includes a controller 521, a first voltage transformer 522, a second voltage transformer 523, a second switch device Q2, a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9. The first input end of the first voltage transformer 522 is connected to the first end V1+ of the first power supply module 100, the second input end of the first voltage transformer 522 is connected to the second end V1- of the first power supply module 100 through the seventh resistor R7, and the first output end of the first voltage transformer 522 is connected to the first input end of the controller 521. The first input end of the second voltage transformer 523 is connected to the first end V2+ of the second power supply module 200 through the eighth resistor R8, the second input end of the second voltage transformer 523 is connected to the second end V2- of the second power supply module 200, the first output end of the second voltage transformer 523 is connected to the second input end of the controller 521, and the second output end of the second voltage transformer 523 and the second output end of the first voltage transformer 522 are both grounded. The output end of the controller 521 is respectively connected to the first end of the ninth resistor R9 and the control end of the second switch device Q2, the second end of the ninth resistor R9 is connected to the second working power supply V4, the first end of the second switch device Q2 is connected to the positive electrode of the light emitter of the second photocoupler U2, and the second end of the second switch device Q2 is grounded. The controller 521 is used to control the second switch device Q2 to turn on when the voltage output by the first power supply module 100 is within the first voltage range.

[0053] It can be understood that when the second switching device Q2 is turned on, the two ends of the light emitter of the second photocoupler U2 (that is, the two output ends of the third switching unit 510) are short-circuited, and the third switching unit 510 cannot transmit a control signal to the second photocoupler U2, thereby controlling the third switching unit 510 to stop outputting the control signal.

[0054] The first working power source V3 and the second working power source V4 can be the same power source or different power sources. In some embodiments, the first working power source V3 can provide a voltage of 12V, and the second working power source can provide a working voltage of 3.3V.

[0055] In some embodiments, the controller 521 is used to control the second switch device Q2 to turn off when the voltage output by the second power supply module 200 is within the second voltage range. It is understandable that when the second switch device Q2 is turned off, the main control unit 520 will not interfere with the operation of the third switch unit 510. The output of the control signal of the third switch unit 510 can be controlled by the controller 521, thereby changing the conduction logic of the switching module 300. The function of the controller 521 can be configured according to actual needs.

[0056] For example, in some embodiments, the controller 521 may be a microcontroller unit (MCU), a single chip microcomputer, a programmable logic controller, a central processing unit or other processors with processing and computing functions. The second switch device Q2 is an NPN transistor.

[0057] The voltage sampling circuit composed of the controller 521, the first voltage transformer 522 and the second voltage transformer 523 can detect the voltage of the first power supply module 100 and the second power supply module 200, and then control the second switching device Q2 based on the voltage of the first power supply module 100 and the second power supply module 200.

[0058] The controller 521 can select to output a high level or a low level according to the voltage output by the first power supply module 100 and the voltage output by the second power supply module 200, thereby controlling the on and off of the second switch device Q2. It can be understood that when the second switch device Q2 is turned on, even if the first switch device Q1 is turned on, it is impossible to apply a voltage to the second photocoupler U2, that is, it is impossible to output a control signal. When the second switch device Q2 is turned off, the third switch unit 510 can output a control signal according to the voltage output by the second power supply module 200. Finally, the selection of the power supply module of the switching module 300 is realized.

[0059] After the power supply module that supplies power loses power and implements the switching of the power supply module, the controller 521 can control the switching module 300 to continue to maintain the current on state even if the power supply module that loses power resumes supplying power.

[0060] The controller 521 may also adjust the power supply module according to the specific voltage values ​​of the first power supply module 100 and the second power supply module 200. The controller 521 may control the switching module 300 to switch the power supply module when the voltage output by the current power supply module is not within the operating voltage range of the rear-end load 20. The controller 521 may also control the switching module 300 to continue to maintain the current state when both the first power supply module 100 and the second power supply module 200 are not within the operating voltage range of the rear-end load 20.

[0061] The first voltage transformer 522 , the second voltage transformer 523 and the third photoelectric coupler U3 can achieve isolation between strong current and weak current, prevent excessive current and voltage from damaging the controller 521 , and improve the safety of the main control unit 520 .

[0062] In one embodiment, the normally closed contact of the relay K1 is connected to the second power supply module 200 , the normally open contact of the relay K1 is connected to the first power supply module 100 , and the common end of the relay K1 is connected to the rear-end load 20 .

[0063] It can be understood that before the coil of the relay K1 receives the switching signal, the normally closed contact of the relay K1 is connected to the common end of the relay K1, so that the second power supply module 200 is connected to the rear-end load 20. After the coil of the relay K1 receives the switching signal, the normally open contact of the relay K1 is connected to the common end of the relay K1, so that the first power supply module 100 is connected to the rear-end load 20.

[0064] When the first power supply module 100 loses power, the interlocking module 400 is unable to provide a switching signal to the coil of the relay K1, so that the normally closed contact of the relay K1 is connected to the common end of the relay K1, thereby realizing automatic connection between the second power supply module 200 and the rear-end load 20.

[0065] In one embodiment, if Figure 3 As shown, the interlocking module 400 further includes a first rectifier unit 430 . The first end of the first resistor R1 is connected to the first power supply module 100 through the first rectifier unit 430 , and the cathode of the light emitter of the first photocoupler U1 is connected to the first power supply module 100 through the first rectifier unit 430 .

[0066] Exemplarily, in some embodiments, the first rectifying unit 430 may include a full-bridge rectifying circuit composed of a plurality of diodes.

[0067] The first rectifier unit 430 can convert the AC power provided by the first power supply module 100 into DC power when the first power supply module 100 is an AC power source, so that the first photocoupler U1 can work normally.

[0068] In some embodiments, the maximum operating voltage of the first rectifying unit 430 is 1000V, and the maximum operating current is 25A.

[0069] In one embodiment, if Figure 3 As shown, the control module 500 further includes a second rectifier unit 530. The first end of the third resistor R3 is connected to the second power supply module 200 through the second rectifier unit 530, and the cathode of the light emitter of the third photocoupler U3 is connected to the second power supply module 200 through the second rectifier unit 530.

[0070] For example, in some embodiments, the second rectifying unit 530 may include a full-bridge rectifying circuit composed of a plurality of diodes.

[0071] The second rectifier unit 530 can convert the AC power provided by the second power supply module 200 into DC power when the second power supply module 200 is an AC power source, so that the third photoelectric coupler U3 can work normally.

[0072] In one embodiment, if Figure 3 As shown, the switching module 300 further includes a third rectifying unit 310 , and the common end of the relay K1 is connected to the rear-end load 20 via the third rectifying unit 310 .

[0073] For example, in some embodiments, the third rectifying unit 310 may include a full-bridge rectifying circuit composed of a plurality of diodes.

[0074] The third rectifier unit 310 can convert the AC power provided by the first power supply module 100 and the second power supply module 200 into DC power when the first power supply module 100 and the second power supply module 200 are AC power sources.

[0075] In some embodiments, Figure 4 As shown, the switching module includes a relay K1 and a relay K2, the relay K1 includes a coil L1, the relay K2 includes a coil L2, and the coil L1 and the coil L2 are connected in parallel between the second end of the optical receiver of the first photocoupler U1 and the negative pole of the light emitter of the first photocoupler U1. The relay K1 is used to control the connection between the first end V1+ of the first power supply module 100 and the first end V2+ of the second power supply module 200 and the rear-end load 20, and the relay K2 is used to control the connection between the second end V1- of the first power supply module 100 and the second end V2- of the second power supply module 200 and the rear-end load 20. The connection between the power supply module and the rear-end load 20 can be flexibly controlled by the two relays.

[0076] In one embodiment, the length, width and height of the circuit board where the power switching circuit 10 is located are 150 mm, 85 mm and 35 mm respectively. The overall volume of the power switching circuit 10 is small, which reduces the space occupied.

[0077] Figure 5 A schematic diagram of the structure of a power system provided by an embodiment of the present application is shown. For the sake of convenience, only the parts related to the present embodiment are shown, which are described in detail as follows:

[0078] The power system 30 includes the power switching circuit 10 according to any one of the above embodiments.

[0079] In one embodiment, if Figure 5As shown, the power system 30 includes a first power supply 31 and a second power supply 32, the first power supply 31 is connected to the first power supply module 100 of the power switching circuit 10, and the second power supply 32 is connected to the second power supply module 200 of the power switching circuit 10. Any one of the first power supply 31 and the second power supply 32 can be connected to the rear-end load 20 through the power switching circuit 10, and the power switching circuit 10 can realize the switching from the first power supply 31 to the second power supply 32 and the switching from the second power supply 32 to the first power supply 31. Therefore, when a certain power supply fails, the power supply can be automatically switched to maintain the power supply to the rear-end load 20, so as to prevent the rear-end load 20 from stopping working due to the power failure.

[0080] The first power source 31 and the second power source 32 may be energy storage batteries, and the power system 30 may be an energy storage device.

[0081] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0082] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0083] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A power switching circuit, characterized in that: The power switching circuit includes a first power supply module, a second power supply module, a switching module, an interlocking module and a control module; The first input end of the switching module is connected to the first power supply module, the second input end of the switching module is connected to the second power supply module, and the output end of the switching module is used to connect to the rear-end load; The first end of the interlocking module is connected to the first power supply module, the second end of the interlocking module is connected to the switching module, the first end of the control module is connected to the second power supply module, and the second end of the control module is connected to the interlocking module; The interlocking module is used to output a switching signal based on the voltage of the first power supply module, and the control module is used to output a control signal based on the voltage of the second power supply module, and the control signal is used to control the interlocking module to stop outputting the switching signal; The switching module is used to control the second power supply module to be connected to the rear-end load when the switching signal is not received, and to control the first power supply module to be connected to the rear-end load when the switching signal is received.

2. The power switching circuit according to claim 1, wherein: The interlocking module includes a first switch unit and a second switch unit; The first end of the first switch unit is connected to the first power supply module, and the second end of the first switch unit is connected to the switching module; the first end of the second switch unit is connected to the control module, and the second end of the second switch unit is connected to the first end of the first switch unit; The first switch unit is used to turn on and output the switching signal when the voltage of the first power supply module is within a first voltage range; The second switch unit is used to control the first switch unit to turn off when receiving the control signal.

3. The power switching circuit according to claim 2, wherein: The first switch unit includes a first photoelectric coupler, and the second switch unit includes a second photoelectric coupler; The positive electrode of the light emitter of the first photoelectric coupler and the first end of the light receiver of the first photoelectric coupler are both connected to the first end of the first power supply module, the negative electrode of the light emitter of the first photoelectric coupler is connected to the second end of the first power supply module, the second end of the light receiver of the first photoelectric coupler is connected to the first control end of the switching module, and the second control end of the switching module is connected to the negative electrode of the light emitter of the first photoelectric coupler; The positive pole of the light emitter of the second photoelectric coupler and the negative pole of the light emitter of the second photoelectric coupler are both connected to the control module, the first end of the light receiver of the second photoelectric coupler is connected to the positive pole of the light emitter of the first photoelectric coupler, and the second end of the light receiver of the second photoelectric coupler is connected to the negative pole of the light emitter of the first photoelectric coupler.

4. The power switching circuit according to claim 3, characterized in that: The control module includes a third switch unit; A first end of the third switch unit is connected to the second power supply module, and a second end of the third switch unit is connected to the interlocking module; The third switch unit is used for being turned on and outputting the control signal when the voltage of the second power supply module is within a second voltage range.

5. The power switching circuit according to claim 4, characterized in that: The third switch unit includes a third photoelectric coupler and a first switch device; The positive electrode of the light emitter of the third photoelectric coupler is connected to the first end of the second power supply module, the negative electrode of the light emitter of the third photoelectric coupler is connected to the second end of the second power supply module, the first end of the optical receiver of the third photoelectric coupler is respectively connected to the control end of the first switching device, the first end of the first switching device is connected to the first working power supply, the second end of the first switching device is connected to the positive electrode of the light emitter of the second photoelectric coupler, and the negative electrode of the light emitter of the second photoelectric coupler and the second end of the optical receiver of the third photoelectric coupler are both grounded.

6. The power switching circuit according to claim 5, characterized in that: The control module also includes a main control unit; The main control unit is connected to the first power supply module, the second power supply module and the third switch unit respectively; The main control unit is used to control the third switch unit to stop outputting the control signal based on the voltage of the first power supply module and the voltage of the second power supply module.

7. The power switching circuit according to claim 6, wherein: The main control unit includes a controller and a second switch device; A first terminal of the second switch device is connected to the positive electrode of the light emitter of the second photoelectric coupler, a second terminal of the second switch device is grounded, and a control terminal of the second switch device is connected to the controller; The controller is used for controlling the second switch device to turn on when the voltage of the first power supply module is within the first voltage range.

8. The power switching circuit according to claim 7, wherein: The main control unit also includes a first voltage transformer and a second voltage transformer; The first input end of the first voltage transformer is connected to the first end of the first power supply module, the second input end of the first voltage transformer is connected to the second end of the first power supply module, and the first output end of the first voltage transformer is connected to the first input end of the controller; The first input end of the second voltage transformer is connected to the first end of the second power supply module, the second input end of the second voltage transformer is connected to the second end of the second power supply module, the first output end of the second voltage transformer is connected to the second input end of the controller, and the second output end of the second voltage transformer and the second output end of the first voltage transformer are both grounded.

9. The power switching circuit according to any one of claims 3 to 8, characterized in that: The switching module includes a relay; A first end of the coil of the relay is connected to a second end of the light receiver of the first photoelectric coupler, and a second end of the coil of the relay is connected to a negative electrode of the light emitter of the first photoelectric coupler; The normally closed contact of the relay is connected to the second power supply module, the normally open contact of the relay is connected to the first power supply module, and the common end of the relay is connected to the rear-end load.

10. A power system, characterized in that: Comprising a power switching circuit as described in any one of claims 1-9.

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