Charging and discharging circuit and power supply
By designing multiple charge and discharge electronic circuits to participate in charge and discharge, the problem of excessive device temperature during single-port charge and discharge is solved, and the device temperature rise is reduced and the service life is extended.
Patent Information
- Application Number
- CN202421028909.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-05-11
AI Technical Summary
When a multi-port charge and discharge device charges and discharges in a single port, a single charge and discharge circuit will bear all current, resulting in a higher device temperature and shorten the device service life.
A charging and discharging circuit is designed, including multiple charging and discharging electronic circuits, controllers and on-off devices. Through the controller, the on-off device is controlled by the controller to allow multiple charging and discharging electronic circuits to participate in charging and discharging and share current.
Working together by multiple charge and discharge electronic circuits, the temperature rise of the device is reduced, the service life of the device is extended, and the loss is reduced.
Smart Images
Figure CN222508856U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of energy storage, and in particular to a charging and discharging circuit and a power supply. Background Art
[0002] With the growth of user demand, multi-port charging and discharging equipment has become a trend. At present, multi-port charging and discharging equipment usually uses multiple independent charging and discharging circuits for charging and discharging. Therefore, when the multi-port charging and discharging equipment is charged and discharged through only one port, only the charging and discharging circuit corresponding to the port works, and the charging and discharging circuit corresponding to the port bears all the current. Therefore, it is easy to cause the device temperature to be high, accelerate the aging of the device, and reduce the service life of the device. Utility Model Content
[0003] The present application discloses a charging and discharging circuit and a power supply, which can reduce the temperature rise of a device and extend the service life of the device.
[0004] In a first aspect, an embodiment of the present application discloses a charging and discharging circuit, comprising: a plurality of charging and discharging electronic circuits, a controller and a plurality of switching devices, wherein: the charging and discharging electronic circuit comprises a charging and discharging interface and a voltage conversion device, the positive end of the charging and discharging interface is electrically connected to the input end of the voltage conversion device, the output end of the voltage conversion device is used to be electrically connected to the positive electrode of the energy storage device, the negative end of the charging and discharging interface is used to be electrically connected to the negative electrode of the energy storage device, and the signal control end of the charging and discharging interface is electrically connected to the controller; the control end of the switching device is electrically connected to the controller, the first end of the switching device is electrically connected to the input end of the first voltage conversion device, and the second end of the switching device is electrically connected to the input end of the second voltage conversion device, wherein the first voltage conversion device and the second voltage conversion device are voltage conversion devices of any two charging and discharging electronic circuits among the plurality of charging and discharging electronic circuits; when the controller determines that one of the plurality of charging and discharging interfaces is in a working state, the controller controls the electrical connection between the first end and the second end of the switching device to be turned on.
[0005] In a second aspect, an embodiment of the present application discloses a power supply, including an energy storage device, wherein the power supply also includes the charge and discharge circuit described in the first aspect, and the charge and discharge circuit is connected to the energy storage device.
[0006] An embodiment of the present application provides a charging and discharging circuit, which includes multiple charging and discharging electronic circuits, a controller and multiple switching devices. The charging and discharging electronic circuit includes a charging and discharging interface and a voltage conversion device. The positive terminal of the charging and discharging interface is electrically connected to the input terminal of the voltage conversion device, the output terminal of the voltage conversion device is used to be electrically connected to the positive electrode of the energy storage device, and the negative terminal of the charging and discharging interface is used to be electrically connected to the negative electrode of the energy storage device. The signal control terminal of the charging and discharging interface is electrically connected to the controller, the control terminal of the switching device is electrically connected to the controller, the first end of the switching device is electrically connected to the input terminal of the first voltage conversion device, and the second end of the switching device is electrically connected to the input terminal of the second voltage conversion device. The first voltage conversion device and the second voltage conversion device are voltage conversion devices of any two charging and discharging electronic circuits in the multiple charging and discharging electronic circuits. When the controller determines that one of the multiple charging and discharging interfaces is in a working state, the controller controls the electrical connection between the first end and the second end of the switching device to be turned on. The multiple charging and discharging electronic circuits all participate in the charging and discharging of the energy storage device by the charging and discharging interface in the working state. Since the devices of the multiple charging and discharging electronic circuits all participate in the work, the temperature rise of the device can be reduced and the service life of the device can be extended. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Figure 1 A schematic diagram of the structure of a charging and discharging circuit disclosed in an embodiment of the present application. DETAILED DESCRIPTION
[0008] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.
[0009] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.
[0010] The present application discloses a charging and discharging circuit and a power supply. Figure 1 A schematic diagram of the structure of a charging and discharging circuit disclosed in an embodiment of the present application.
[0011] like Figure 1As shown, the charge and discharge circuit disclosed in the present application includes: a plurality of charge and discharge electronic circuits 110, a controller 130 and a plurality of on-off devices 140, wherein: the charge and discharge electronic circuit 110 includes a charge and discharge interface 111 and a voltage conversion device 112, the positive terminal of the charge and discharge interface 111 is electrically connected to the input terminal of the voltage conversion device 112, the output terminal of the voltage conversion device 112 is used to be electrically connected to the positive electrode of the energy storage device 120, the negative terminal of the charge and discharge interface 111 is used to be electrically connected to the negative electrode of the energy storage device 120, and the signal control terminal of the charge and discharge interface 111 is electrically connected to the controller 130; the on-off device 140 The control end of the on-off device 140 is electrically connected to the controller 130, the first end of the on-off device 140 is electrically connected to the input end of the first voltage conversion device, and the second end of the on-off device 140 is electrically connected to the input end of the second voltage conversion device, wherein the first voltage conversion device and the second voltage conversion device are voltage conversion devices 112 of any two charging and discharging electronic circuits 110 among the multiple charging and discharging electronic circuits 110; when the controller 130 determines that one of the multiple charging and discharging interfaces 111 is in a working state, the controller 130 controls the electrical connection between the first end and the second end of the on-off device 140 to be turned on.
[0012] In the present application, the charge and discharge interface 111 is used to connect to an external device to charge or discharge the energy storage device 120. The voltage conversion device 112 is used to convert the voltage input through the charge and discharge interface 111, and illustratively, convert the 5V voltage input through the charge and discharge interface 111 into an 8V voltage input to the positive electrode of the energy storage device 120.
[0013] For each on-off device 140, the control end of the on-off device 140 is electrically connected to the controller 130, the first end of the on-off device 140 is electrically connected to the input end of the voltage conversion device 112 of any one of the multiple charging and discharging electronic circuits 110, and the second end of the on-off device 140 is electrically connected to the input end of the voltage conversion device 112 of another charging and discharging electronic circuit 110 of the multiple charging and discharging electronic circuits 110. When the electrical connection between the first end and the second end of the on-off device 140 is controlled to be turned on by the controller 130, the charging and discharging electronic circuit 110 connected to the first end of the on-off device 140 and the charging and discharging electronic circuit 110 connected to the second end of the on-off device 140 are connected. When the electrical connection between the first end and the second end of the on-off device 140 is disconnected by the controller 130, the charging and discharging electronic circuit 110 connected to the first end of the on-off device 140 and the charging and discharging electronic circuit 110 connected to the second end of the on-off device 140 work independently.
[0014] The positive end of the charge and discharge interface 111, that is, the VBUS pin of the charge and discharge interface 111; the negative end of the charge and discharge interface 111, that is, the GND pin of the charge and discharge interface 111; the signal control end of the charge and discharge interface 111 includes the configuration channel 1 (configurable channel 1, CC1), configuration channel 2 (configurable channel 2, CC2), D+ and D- of the charge and discharge interface 111.
[0015] The charge and discharge interface 111 is in working state, that is, the energy storage device 120 is charged or discharged through the charge and discharge interface 111. The present application electrically connects the signal control end of the charge and discharge interface 111 to the controller 130, so that the controller 130 can determine whether the charge and discharge interface 111 is in working state. When the controller 130 determines that only one of the charge and discharge interfaces 111 of the multiple charge and discharge electronic circuits 110 is in working state, the controller 130 controls the electrical connection between the first end and the second end of the on-off device 140 to be turned on, that is, multiple charge and discharge electronic circuits 110 are connected. In this case, multiple charge and discharge electronic circuits 110 all participate in charging and discharging. Specifically, during charging, after the current passes through the charge and discharge interface 111 in working state, it is divided into multiple parts, and the energy storage device 120 is charged through the voltage conversion devices 112 of the multiple charge and discharge electronic circuits 110 respectively. Since the devices of the multiple charge and discharge electronic circuits 110 all participate in the work, the temperature rise of the device can be reduced and the service life of the device can be extended. It should be noted that the working logic during discharge is similar to that during charging, and this application will not repeat it here.
[0016] The embodiment of the present application provides a charging and discharging circuit, which includes multiple charging and discharging electronic circuits 110, a controller 130 and multiple switching devices 140. The charging and discharging electronic circuit 110 includes a charging and discharging interface 111 and a voltage conversion device 112. The positive terminal of the charging and discharging interface 111 is electrically connected to the input terminal of the voltage conversion device 112, and the output terminal of the voltage conversion device 112 is used to be electrically connected to the positive electrode of the energy storage device 120. The negative terminal of the charging and discharging interface 111 is used to be electrically connected to the negative electrode of the energy storage device 120. The signal control terminal of the charging and discharging interface 111 is electrically connected to the controller 130, the control terminal of the switching device 140 is electrically connected to the controller 130, and the first terminal of the switching device 140 is electrically connected to the first voltage conversion device The input end of the on-off device 140 is electrically connected, the second end of the on-off device 140 is electrically connected to the input end of the second voltage conversion device, the first voltage conversion device and the second voltage conversion device are voltage conversion devices 112 of any two charging and discharging electronic circuits 110 in the multiple charging and discharging electronic circuits 110. When the controller 130 determines that one of the multiple charging and discharging interfaces 111 is in a working state, the controller 130 controls the electrical connection between the first end and the second end of the on-off device 140 to be turned on, and the multiple charging and discharging electronic circuits 110 all participate in the charging and discharging of the energy storage device 120 by the charging and discharging interface 111 in a working state. Since the devices of the multiple charging and discharging electronic circuits 110 all participate in the work, the temperature rise of the device can be reduced and the service life of the device can be extended.
[0017] When the controller 130 determines that two or more of the multiple charging and discharging interfaces 111 are in working state, in order to ensure normal operation, the controller 130 controls the electrical connection between the first end and the second end of the on-off device 140 to be disconnected, that is, the multiple charging and discharging electronic circuits 110 work independently of each other.
[0018] In this application, if Figure 1As shown, in the case where the multiple charging and discharging electronic circuits 110 include a first charging and discharging electronic circuit 110 and a second charging and discharging electronic circuit 110, the control end of the on-off device 140 is electrically connected to the controller 130, the first end of the on-off device 140 is electrically connected to the input end of the voltage conversion device 112 of the first charging and discharging electronic circuit 110, and the second end of the on-off device 140 is electrically connected to the input end of the voltage conversion device 112 of the second charging and discharging electronic circuit 110. When the controller 130 determines that one of the two charging and discharging interfaces 111 is in a working state, the controller 130 controls the electrical connection between the first end and the second end of the on-off device 140 to be turned on. During charging, the current I passes through the charging and discharging interface 111 in the working state. 11 is divided into two parts, I / 2 of the current passes through the voltage conversion device 112 of the first charge-discharge electronic circuit 110 to charge the energy storage device 120, and I / 2 of the current passes through the on-off device 140 and the voltage conversion device 112 of the second charge-discharge electronic circuit 110 to charge the energy storage device 120. The voltage conversion device 112 of the first charge-discharge electronic circuit 110 and the voltage conversion device 112 of the second charge-discharge electronic circuit 110 work at the same time, and the current is only half of the input current, so as to achieve input current sharing. In addition, since the voltage conversion device 112 of the first charge-discharge electronic circuit 110 and the voltage conversion device 112 of the second charge-discharge electronic circuit 110 are both involved in the work, the heat generated is evenly distributed on the device, so as to achieve heat sharing. In addition, since the power loss W=I 2 ×R, when the current is reduced to I / 2, the power loss W1=(I / 2) 2 ×R=1 / 4×I 2 ×R, therefore, when the current is I / 2, the power loss is reduced by 4 times. It can be seen that the use of the charging and discharging circuit disclosed in the present application can not only achieve current and heat distribution, reduce the temperature rise of the device, and extend the service life of the device, but also reduce the loss.
[0019] It should be noted that the working logic during discharge is similar to that during charging, and this application will not repeat it here.
[0020] In one implementation, the plurality of charging and discharging electronic circuits 110 may include a first charging and discharging electronic circuit 110, a second charging and discharging electronic circuit 110, and a third charging and discharging electronic circuit 110, and the plurality of on-off devices 140 may include a first on-off device 140, a second on-off device 140, and a third on-off device 140, wherein: a control end of the first on-off device 140 is electrically connected to the controller 130, a first end of the first on-off device 140 is electrically connected to an input end of a voltage conversion device 112 of the first charging and discharging electronic circuit 110, and a second end of the first on-off device 140 is electrically connected to an input end of a voltage conversion device 112 of the second charging and discharging electronic circuit 110; and the second on-off device 140 is electrically connected to an input end of a voltage conversion device 112 of the second charging and discharging electronic circuit 110; The control end of the device 140 is electrically connected to the controller 130, the first end of the second on-off device 140 is electrically connected to the input end of the voltage conversion device 112 of the first charging and discharging electronic circuit 110, and the second end of the second on-off device 140 is electrically connected to the input end of the voltage conversion device 112 of the third charging and discharging electronic circuit 110; the control end of the third on-off device 140 is electrically connected to the controller 130, the first end of the third on-off device 140 is electrically connected to the input end of the voltage conversion device 112 of the second charging and discharging electronic circuit 110, and the second end of the third on-off device 140 is electrically connected to the input end of the voltage conversion device 112 of the third charging and discharging electronic circuit 110.
[0021] That is to say, each of the multiple charging and discharging electronic circuits 110 is directly connected to other charging and discharging electronic circuits 110 through the on-off device 140. When the controller 130 determines that one of the multiple charging and discharging interfaces 111 is in a working state, the controller 130 controls the electrical connection between the first end and the second end of the on-off device 140 to be turned on, so as to achieve current equalization, heat equalization and reduce losses.
[0022] It should be noted that the connection condition when the multiple charging and discharging electronic circuits 110 include four charging and discharging electronic circuits 110, five charging and discharging electronic circuits 110 or more charging and discharging electronic circuits 110 is similar to the connection condition including three charging and discharging electronic circuits 110 described above, and this application will not repeat it here.
[0023] In another implementation, the multiple charging and discharging electronic circuits 110 may include a first charging and discharging electronic circuit 110, a second charging and discharging electronic circuit 110 and a third charging and discharging electronic circuit 110, and the multiple switching devices 140 may include a first switching device 140 and a second switching device 140, wherein: the control end of the first switching device 140 is electrically connected to the controller 130, the first end of the first switching device 140 is electrically connected to the input end of the voltage conversion device 112 of the first charging and discharging electronic circuit 110, and the second end of the first switching device 140 is electrically connected to the input end of the voltage conversion device 112 of the second charging and discharging electronic circuit 110; the control end of the second switching device 140 is electrically connected to the controller 130, the first end of the second switching device 140 is electrically connected to the input end of the voltage conversion device 112 of the second charging and discharging electronic circuit 110, and the second end of the second switching device 140 is electrically connected to the input end of the voltage conversion device 112 of the third charging and discharging electronic circuit 110.
[0024] That is to say, two adjacent charging and discharging electronic circuits 110 are connected through the on-off device 140, that is, each of the multiple charging and discharging electronic circuits 110 is directly connected to the adjacent charging and discharging electronic circuit 110 through the on-off device 140, and is indirectly connected to other charging and discharging electronic circuits 110. When the controller 130 determines that one of the multiple charging and discharging interfaces 111 is in a working state, the controller 130 controls the electrical connection between the first end and the second end of the on-off device 140 to be turned on, and the multiple charging and discharging electronic circuits 110 all participate in the charging and discharging of the energy storage device 120 by the charging and discharging interface 111 in a working state. Since the devices of the multiple charging and discharging electronic circuits 110 all participate in the work, current diversion can be achieved, the temperature rise of the device can be reduced, and the service life of the device can be extended.
[0025] It should be noted that the connection condition when the multiple charging and discharging electronic circuits 110 include four charging and discharging electronic circuits 110, five charging and discharging electronic circuits 110 or more charging and discharging electronic circuits 110 is similar to the connection condition including three charging and discharging electronic circuits 110 described above, and this application will not repeat it here.
[0026] Alternatively, if Figure 1As shown, the on-off device 140 may include a first metal oxide semiconductor field effect transistor Q1 and a second metal oxide semiconductor field effect transistor Q2, wherein: the control end of the first metal oxide semiconductor field effect transistor Q1 is electrically connected to the controller 130, the first end of the first metal oxide semiconductor field effect transistor Q1 is electrically connected to the input end of the first voltage conversion device, and the second end of the first metal oxide semiconductor field effect transistor Q1 is electrically connected to the second end of the second metal oxide semiconductor field effect transistor Q2; the control end of the second metal oxide semiconductor field effect transistor Q2 is electrically connected to the controller 130, and the first end of the second metal oxide semiconductor field effect transistor Q2 is electrically connected to the input end of the second voltage conversion device.
[0027] The present application may use a metal oxide semiconductor field effect transistor (MOS) to form the on-off device 140. Since a diode is provided in the MOS transistor, the present application uses two MOS transistors to form the on-off device 140. The control end of the first MOS transistor Q1 and the control end of the second MOS transistor Q2 are electrically connected to the controller 130. The first end of the first MOS transistor Q1 is electrically connected to the input end of the first voltage conversion device, the second end of the first MOS transistor Q1 is electrically connected to the second end of the second MOS transistor Q2, and the first end of the second MOS transistor Q2 is electrically connected to the input end of the second voltage conversion device. When it is necessary to control the electrical connection between the first end and the second end of the on-off device 140 to be disconnected, the controller 130 controls the electrical connection between the first end and the second end of the first MOS transistor Q1 to be disconnected, and controls the electrical connection between the first end and the second end of the second MOS transistor Q2 to be disconnected, thereby ensuring that the first end to the second end of the on-off device 140 and the second end to the first end of the on-off device 140 are both disconnected.
[0028] Exemplarily, the control end of the first MOS tube Q1 and the control end of the second MOS tube Q2 are the gates of the MOS tubes, the first end of the first MOS tube Q1 and the first end of the second MOS tube Q2 are the drains of the MOS tubes, and the second end of the first MOS tube Q1 and the second end of the second MOS tube Q2 are the sources of the MOS tubes.
[0029] In the embodiment of the present application, the control end of the first MOS transistor Q1 and the control end of the second MOS transistor Q2 can be connected to the same end of the controller 130. That is, the controller 130 controls the first MOS transistor Q1 and the second MOS transistor Q2 to be turned on or off at the same time.
[0030] Optionally, the on-off device 140 may include a transistor, wherein: the control end of the transistor is electrically connected to the controller 130, the first end of the transistor is electrically connected to the input end of the first voltage conversion device, and the second end of the transistor is electrically connected to the input end of the second voltage conversion device. In other words, the connection or disconnection of the two charging and discharging electronic circuits 110 is controlled by the transistor.
[0031] Optionally, the on-off device 140 may include a relay, wherein: the control end of the relay is electrically connected to the controller 130, the first end of the relay is electrically connected to the input end of the first voltage conversion device, and the second end of the relay is electrically connected to the input end of the second voltage conversion device. When the electrical connection between the first end and the second end of the on-off device 140 needs to be turned on, the control end of the relay is powered on by the controller 130, and the electrical connection between the first end and the second end of the relay is turned on; when the electrical connection between the first end and the second end of the on-off device 140 needs to be turned off, the control end of the relay is not powered on, and the electrical connection between the first end and the second end of the relay is turned off.
[0032] In the embodiments of the present application, Figure 1 As shown, the charging and discharging electronic circuit 110 may also include an on-off switch 113, and the positive terminal of the charging and discharging interface 111 is electrically connected to the input terminal of the voltage conversion device 112, which may include: the control end of the on-off switch 113 is electrically connected to the controller 130, the first end of the on-off switch 113 is electrically connected to the positive terminal of the charging and discharging interface 111, and the second end of the on-off switch 113 is electrically connected to the input terminal of the voltage conversion device 112. By controlling the on-off switch 113 to be turned on or off by the controller 130, the charging and discharging interface 111 and the input terminal of the voltage conversion device 112 can be turned on or off, thereby achieving safety protection.
[0033] In the present application, the composition structure of the on-off switch 113 may be the same as the composition structure of the on-off device 140 described above, and the present application will not repeat them here.
[0034] In one implementation, the voltage conversion device 112 may also be electrically connected to the controller 130, and the controller 130 may control the conversion of the voltage conversion device 112. For example, the controller 130 may control the voltage conversion device 112 to convert 5V to 8V, and the controller 130 may also control the voltage conversion device 112 to convert 5V to 12V.
[0035] In one implementation, the voltage conversion device 112 may include a DC-DC circuit. That is, the voltage input through the charge and discharge interface 111 may be converted by the DC-DC circuit. It should be noted that the DC-DC circuit here may be a DC-DC circuit of the prior art.
[0036] In one implementation, the controller 130 may include a micro controller unit (MCU), and the charge and discharge interface 111 may include a Type C port.
[0037] The present application also discloses a power supply, including an energy storage device, which may be a battery cell, such as a lithium-ion battery cell, or a capacitor, such as a supercapacitor. The power supply also includes the charge and discharge circuit described above, which is connected to the energy storage device.
[0038] The above embodiments of the present application focus on describing the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.
[0039] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims
1. A charging and discharging circuit, characterized in that: include: A plurality of charging and discharging electronic circuits, a controller and a plurality of switching devices, wherein: The charging and discharging electronic circuit includes a charging and discharging interface and a voltage conversion device, wherein the positive terminal of the charging and discharging interface is electrically connected to the input terminal of the voltage conversion device, the output terminal of the voltage conversion device is used to be electrically connected to the positive electrode of the energy storage device, the negative terminal of the charging and discharging interface is used to be electrically connected to the negative electrode of the energy storage device, and the signal control terminal of the charging and discharging interface is electrically connected to the controller; The control end of the on-off device is electrically connected to the controller, the first end of the on-off device is electrically connected to the input end of the first voltage conversion device, and the second end of the on-off device is electrically connected to the input end of the second voltage conversion device, wherein the first voltage conversion device and the second voltage conversion device are voltage conversion devices of any two of the multiple charging and discharging electronic circuits; When the controller determines that one of the plurality of charging and discharging interfaces is in a working state, the controller controls the electrical connection between the first end and the second end of the switching device to be turned on.
2. The charge and discharge circuit according to claim 1, characterized in that: The plurality of charge-discharge electronic circuits include a first charge-discharge electronic circuit, a second charge-discharge electronic circuit, and a third charge-discharge electronic circuit, and the plurality of on-off devices include a first on-off device, a second on-off device, and a third on-off device, wherein: The control end of the first on-off device is electrically connected to the controller, the first end of the first on-off device is electrically connected to the input end of the voltage conversion device of the first charge-discharge electronic circuit, and the second end of the first on-off device is electrically connected to the input end of the voltage conversion device of the second charge-discharge electronic circuit; The control end of the second on-off device is electrically connected to the controller, the first end of the second on-off device is electrically connected to the input end of the voltage conversion device of the first charge-discharge electronic circuit, and the second end of the second on-off device is electrically connected to the input end of the voltage conversion device of the third charge-discharge electronic circuit; The control end of the third on-off device is electrically connected to the controller, the first end of the third on-off device is electrically connected to the input end of the voltage conversion device of the second charging and discharging electronic circuit, and the second end of the third on-off device is electrically connected to the input end of the voltage conversion device of the third charging and discharging electronic circuit.
3. The charge and discharge circuit according to claim 1, characterized in that: The multiple charge-discharge electronic circuits include a first charge-discharge electronic circuit, a second charge-discharge electronic circuit, and a third charge-discharge electronic circuit, and the multiple switching devices include a first switching device and a second switching device, wherein: The control end of the first on-off device is electrically connected to the controller, the first end of the first on-off device is electrically connected to the input end of the voltage conversion device of the first charge-discharge electronic circuit, and the second end of the first on-off device is electrically connected to the input end of the voltage conversion device of the second charge-discharge electronic circuit; The control end of the second on-off device is electrically connected to the controller, the first end of the second on-off device is electrically connected to the input end of the voltage conversion device of the second charging and discharging electronic circuit, and the second end of the second on-off device is electrically connected to the input end of the voltage conversion device of the third charging and discharging electronic circuit.
4. The charge and discharge circuit according to claim 1, characterized in that: The switching device comprises a first metal oxide semiconductor field effect transistor and a second metal oxide semiconductor field effect transistor, wherein: The control terminal of the first metal oxide semiconductor field effect transistor is electrically connected to the controller, the first terminal of the first metal oxide semiconductor field effect transistor is electrically connected to the input terminal of the first voltage conversion device, and the second terminal of the first metal oxide semiconductor field effect transistor is electrically connected to the second terminal of the second metal oxide semiconductor field effect transistor; The control end of the second metal oxide semiconductor field effect transistor is electrically connected to the controller, and the first end of the second metal oxide semiconductor field effect transistor is electrically connected to the input end of the second voltage conversion device.
5. The charge and discharge circuit according to claim 4, characterized in that: The control end of the first metal oxide semiconductor field effect transistor and the control end of the second metal oxide semiconductor field effect transistor are connected to the same end of the controller.
6. The charge and discharge circuit according to claim 1, characterized in that: The switching device comprises a triode, wherein: The control end of the transistor is electrically connected to the controller, the first end of the transistor is electrically connected to the input end of the first voltage conversion device, and the second end of the transistor is electrically connected to the input end of the second voltage conversion device.
7. The charge and discharge circuit according to claim 1, characterized in that: The on-off device comprises a relay, wherein: The control end of the relay is electrically connected to the controller, the first end of the relay is electrically connected to the input end of the first voltage conversion device, and the second end of the relay is electrically connected to the input end of the second voltage conversion device.
8. The charge and discharge circuit according to claim 1, characterized in that: The charging and discharging electronic circuit further includes an on-off switch, and the positive terminal of the charging and discharging interface is electrically connected to the input terminal of the voltage conversion device, including: The control end of the on-off switch is electrically connected to the controller, the first end of the on-off switch is electrically connected to the positive end of the charge and discharge interface, and the second end of the on-off switch is electrically connected to the input end of the voltage conversion device.
9. The charge and discharge circuit according to claim 1, characterized in that: The voltage conversion device includes a DC-DC circuit.
10. A power supply comprising an energy storage device, characterized in that: The power supply further comprises the charge and discharge circuit according to any one of claims 1 to 9, and the charge and discharge circuit is connected to the energy storage device.