Switching circuit, energy storage device

Abstract

This application relates to the field of switch control technology, and discloses a switch circuit and an energy storage device. The circuit includes: a switch device with parasitic capacitance; a first terminal of the switch device for connection to a load; a second terminal of the switch device for connection to a power supply; a first terminal of a first resistor connected to the second terminal of the switch device, and the second terminal of the first resistor connected to the control terminal of the switch device; a bleeder connected in parallel with the first resistor; the bleeder includes a first controlled switch connected in series with the second resistor; the anode of a diode connected to the second terminal of the first controlled switch, and the cathode of the diode connected to the control terminal of the first controlled switch; and a control circuit connected to both the control terminal of the switch device and the control terminal of the first controlled switch. Thus, by connecting a second resistor in parallel with the first resistor when the switch device is off, the parasitic capacitance in the switch device discharges faster, thereby quickly turning off the switch device.

Description

Technical Field

[0001] This application relates to the field of switch control technology, and in particular to a switch circuit and an energy storage device. Background Technology

[0002] Currently, switching devices containing parasitic capacitance are used in switching circuits. To ensure that switching devices with parasitic capacitance can be turned on smoothly, a resistor with a relatively large value, such as a 10K (kiloohm) resistor, is usually connected between the control terminal of the switching device and the terminal used to connect to the power supply. However, this causes the parasitic capacitance of the switching device to discharge very slowly, resulting in a slow turn-off speed.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0005] This application provides a switching circuit and an energy storage device for quickly turning off switching devices.

[0006] This application provides a switching circuit, including: a switching device having parasitic capacitance, a first terminal of the switching device for connection to a load, and a second terminal of the switching device for connection to a power supply; a first resistor, a first terminal of the first resistor connected to the second terminal of the switching device, and the second terminal of the first resistor connected to a control terminal of the switching device; a bleeder connected in parallel with the first resistor; the bleeder includes a first controlled switch connected in series with a second resistor; a diode, the anode of the diode connected to the second terminal of the first controlled switch, and the cathode of the diode connected to the control terminal of the first controlled switch; and a control circuit connected to both the control terminal of the switching device and the control terminal of the first controlled switch, wherein the control circuit controls the first controlled switch to be turned on when the switching device is turned off.

[0007] In the above embodiment, a first resistor is provided between the control terminal of the switching device and the first terminal of the switching device used to connect to the power supply. When the switching device is off, a second resistor is connected in parallel with the first resistor. Since the total resistance after the two resistors are connected in parallel is less than that of the first and second resistors, the current flowing through the first and second resistors is larger than the current without the second resistor connected in parallel. This results in a faster discharge rate of the parasitic capacitance in the switching device, thereby quickly turning off the switching device. At the same time, by adding a diode to the second terminal and the control terminal of the first controlled switch, a voltage drop is generated through the diode, enabling the first controlled switch to operate normally.

[0008] Furthermore, the switching circuit also includes a third resistor, the first end of which is connected to the control terminal of the first controlled switch, and the second end of which is connected to the voltage source of the control circuit; the voltage source of the control circuit is the power supply.

[0009] In the above embodiment, by adding a third resistor, the current flowing through the control terminal of the first controlled switch can be limited, thereby protecting the first controlled switch.

[0010] Furthermore, the switching device has the opposite polarity to the first controlled switch. The control circuit includes: a second controlled switch, the control terminal of the second controlled switch being configured to receive a pulse control signal, the first terminal of the second controlled switch being connected to the control terminal of the switching device and the control terminal of the first controlled switch; and the second terminal of the second controlled switch being grounded.

[0011] In the above embodiments, by controlling the on / off state of the second controlled switch through a pulse control signal, the voltage of the control terminal of the switching device and the control terminal of the first controlled switch can be changed. Since the polarities of the switching device and the first controlled switch are opposite, it is easy to control the first controlled switch to be turned on when the switching device is turned off.

[0012] Furthermore, the control circuit also includes a fourth resistor, wherein the second controlled switch is configured to receive a pulse control signal through the fourth resistor.

[0013] In the above embodiment, by adding a fourth resistor, the current flowing through the control terminal of the second controlled switch can be limited, thereby protecting the second controlled switch.

[0014] Furthermore, the control circuit also includes: a capacitor, the first end of which is connected to the control terminal of the second controlled switch, and the second end of which is connected to the second terminal of the second controlled switch.

[0015] In the above embodiment, by connecting a capacitor between the control terminal and the second terminal of the second controlled switch, the frequency response of the circuit can be stabilized.

[0016] Furthermore, the control circuit also includes: a fifth resistor, the first end of which is connected to the control terminal of the second controlled switch, and the second end of which is connected to the second terminal of the second controlled switch.

[0017] In the above embodiment, by connecting a fifth resistor and a capacitor between the control terminal and the second terminal of the second controlled switch, the voltage change at the control terminal of the second controlled switch can be delayed, avoiding mis-turning of the second controlled switch due to noise or interference, thereby improving circuit stability.

[0018] Furthermore, the second controlled switch is an isolating switch, and the control circuit further includes: a third controlled switch; the control terminal of the isolating switch is configured to receive a pulse control signal through the third controlled switch; wherein: the control terminal of the third controlled switch is configured to receive a pulse control signal; the first terminal of the third controlled switch is connected to the control terminal of the isolating switch and configured to be connected to a preset voltage source, and the second terminal of the third controlled switch is grounded; or, the first terminal of the third controlled switch is configured to be connected to a preset voltage source, and the second terminal of the third controlled switch is connected to the control terminal of the isolating switch and grounded.

[0019] In the above embodiments, by setting an isolating switch, the digital signal transmission between different circuit modules can be isolated, that is, the signal of one circuit module can be used to control another circuit module, preventing the circuit from oscillating and becoming unstable.

[0020] Furthermore, the control circuit also includes a sixth resistor, through which the control terminal of the disconnect switch is connected to the preset voltage source.

[0021] In the above embodiment, by adding a sixth resistor, the current flowing through the control terminal of the disconnecting switch can be limited, thereby protecting the disconnecting switch.

[0022] Furthermore, the control circuit further includes: a processor connected to the control terminal of the second controlled switch; the processor is used to provide pulse control signals; or, a signal generator connected to the control terminal of the second controlled switch; the signal generator is used to provide pulse control signals.

[0023] In the above embodiments, pulse control signals can be conveniently provided by a processor or signal generator.

[0024] This application provides an energy storage device, including the switching circuit described above.

[0025] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0026] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0027] Figure 1 This is a schematic diagram of the first type of switching circuit provided in the embodiments of this application;

[0028] Figure 2 This is a schematic diagram of the second type of switching circuit provided in the embodiments of this application;

[0029] Figure 3 This is a schematic diagram of the third type of switching circuit provided in the embodiments of this application.

[0030] Figure label:

[0031] 1: Switching device; 2: First resistor; 3: Discharge section; 4: Control circuit; 5: First controlled switch; 6: Second resistor; 7: Third resistor; 8: Diode; 9: Second controlled switch; 10: Fourth resistor; 11: Fifth resistor; 12: Capacitor; 13: Third controlled switch; 14: Sixth resistor; 15: First MOSFET; 16: First transistor; 17: Second transistor; 18: Third transistor; 19: Optocoupler. Detailed Implementation

[0032] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0033] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0034] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0035] Unless otherwise stated, the term "multiple" means two or more.

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0037] Example 1

[0038] Combination Figure 1 As shown in the figure, this application provides a switching circuit, including: a switching device 1, a first resistor 2, a bleeder 3, a diode 8, and a control circuit 4. The switching device 1 has parasitic capacitance. A first terminal of the switching device 1 is connected to a load, and a second terminal is connected to a power supply. The first terminal of the first resistor 2 is connected to the second terminal of the switching device 1, and the second terminal of the first resistor 2 is connected to the control terminal of the switching device 1. The bleeder 3 includes a first controlled switch 5 connected in series with a second resistor 6, and the bleeder 3 is connected in parallel with the first resistor 2. The anode of the diode 8 is connected to the second terminal of the first controlled switch 5, and the cathode of the diode 8 is connected to the control terminal of the first controlled switch 5. The control circuit 4 is connected to both the control terminal of the switching device 1 and the control terminal of the first controlled switch 5. The control circuit 4 is used to control the first controlled switch 5 to conduct when the switching device 1 is turned off.

[0039] When the switching device 1 is turned on, the power supply is used to supply power to the load.

[0040] For example, the switching device 1 can be a component with parasitic capacitance that can be controlled to turn on and off, such as a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor), a transistor, etc.

[0041] For example, the first controlled switch 5 can be a component that is controlled to turn on and off in the prior art, such as a MOSFET, a transistor, etc., which is not limited here.

[0042] In some embodiments, the second resistor 6 may be a single resistor.

[0043] For example, the first end of the first controlled switch 5 is connected to the second end of the second resistor 6, the first end of the second resistor 6 is connected to the first end of the first resistor 2, and the second end of the first controlled switch 5 is connected to the second end of the first resistor 2.

[0044] In other embodiments, the second resistor 6 may also be formed by connecting multiple sub-resistors in series or in parallel.

[0045] For example, suppose the first sub-resistor and the second sub-resistor are connected in parallel, and the total resistance of the first sub-resistor and the second sub-resistor in parallel is used as the second resistor 6. At this time, the first terminal of the first controlled switch 5 is connected to the second terminal of the first sub-resistor and the second terminal of the second sub-resistor, the first terminal of the first sub-resistor and the first terminal of the second sub-resistor are connected to the first terminal of the first resistor 2, and the second terminal of the first controlled switch 5 is connected to the second terminal of the first resistor 2.

[0046] In this way, considering that resistors on the market usually have specific specifications, by connecting multiple sub-resistors in parallel as the second resistor 6, the resistance value of the second resistor 6 can be made smaller, and thus the total resistance value after the second resistor 6 and the first resistor 2 are connected in parallel is smaller, thereby making the parasitic capacitance discharge faster and turning off the switching device 1 more quickly.

[0047] In some embodiments, the switching circuit further includes a third resistor 7. The first end of the third resistor 7 is connected to the control terminal of the first controlled switch 5, and the second end of the third resistor 7 is used to connect to the voltage source of the control circuit 4.

[0048] In this circuit, the voltage source for the control circuit is the power supply. Therefore, the second terminal of the third resistor 7 is used to connect to the power supply.

[0049] In some embodiments, the switching device 1 has the opposite polarity to the first controlled switch 5. The control circuit 4 includes a second controlled switch 9. The control terminal of the second controlled switch 9 is configured to receive a pulse control signal. The first terminal of the second controlled switch 9 is connected to the control terminals of the switching device 1 and the first controlled switch 5; the second terminal of the second controlled switch 9 is grounded. Thus, by using a low-level conducting switching device and a high-level conducting first and second controlled switches, the control circuit can easily achieve the control of the first controlled switch to be turned on when the controlling switching device is turned off.

[0050] The second controlled switch 9 can be any component that is controlled to turn on and off in the prior art, such as a MOSFET or a transistor, and is not limited here.

[0051] In the above embodiment, the control circuit 4 further includes a fourth resistor 10. The second controlled switch 9 is configured to receive pulse control signals through the fourth resistor 10.

[0052] For example, in combination Figure 1 As shown, the switching device 1 is a first MOSFET 15, the first controlled switch 5 is a first transistor 16, and the second controlled switch 9 is a second transistor 17. Specifically, the first MOSFET 15 is a P-type MOSFET, the first transistor 16 is an NPN transistor, and the second transistor 17 is an NPN transistor. The switching circuit can be configured as follows: the drain of the first MOSFET 15 is connected to the load, and the source of the first MOSFET 15 is connected to the power supply. The first terminal of the first resistor 2 is connected to the source of the first MOSFET 15, and the second terminal of the first resistor 2 is connected to the gate of the first MOSFET 15. The first terminal of the second resistor 6 is connected to the first terminal of the first resistor 2. The collector of the first transistor 16 is connected to the second terminal of the second resistor 6, the emitter of the first transistor 16 is connected to the second terminal of the first resistor 2 and the anode of the diode 8, and the base of the first transistor 16 is connected to the first terminal of the third resistor 7, the cathode of the diode 8, and the collector of the second transistor 17. The second terminal of the third resistor 7 is connected to the power supply. The emitter of the second transistor 17 is grounded, and the base of the second transistor 17 is connected to the second terminal of the fourth resistor 10. The first terminal of the fourth resistor 10 is used to receive pulse control signals.

[0053] In other embodiments, the switching device 1 and the first controlled switch 5 have the same polarity. The control circuit includes an inverter and a second controlled switch 9. The control terminal of the second controlled switch 9 is configured to receive a pulse control signal. The first terminal of the second controlled switch 9 is connected to the control terminal of the switching device 1 and the input terminal of the inverter. The output terminal of the inverter is connected to the control terminal of the first controlled switch 5; the second terminal of the second controlled switch 9 is grounded.

[0054] In the above embodiment, the control circuit 4 further includes a capacitor 12. The first end of the capacitor 12 is connected to the control terminal of the second controlled switch 9, and the second end of the capacitor 12 is connected to the second terminal of the second controlled switch 9.

[0055] In the above embodiment, the control circuit 4 further includes: a fifth resistor 11, the first end of the fifth resistor 11 being connected to the control terminal of the second controlled switch 9, and the second end of the fifth resistor 11 being connected to the second terminal of the second controlled switch 9.

[0056] For example, in combination Figure 2As shown, the switching device 1 is a first MOSFET 15, the first controlled switch 5 is a first transistor 16, and the second controlled switch 9 is a second transistor 17. Specifically, the first MOSFET 15 is a P-type MOSFET, the first transistor 16 is an NPN transistor, and the second transistor 17 is an NPN transistor. The switching circuit can be configured as follows: the drain of the first MOSFET 15 is connected to the load, and the source of the first MOSFET 15 is connected to the power supply. The first terminal of the first resistor 2 is connected to the source of the first MOSFET 15, and the second terminal of the first resistor 2 is connected to the gate of the first MOSFET 15. The first terminal of the second resistor 6 is connected to the first terminal of the first resistor 2. The collector of the first transistor 16 is connected to the second terminal of the second resistor 6, the emitter of the first transistor 16 is connected to the second terminal of the first resistor 2 and the anode of the diode 8, and the base of the first transistor 16 is connected to the first terminal of the third resistor 7, the cathode of the diode 8, and the collector of the second transistor 17. The second terminal of the third resistor 7 is connected to the power supply. The emitter of the second transistor 17 is grounded, and the base of the second transistor 17 is connected to the second terminal of the fourth resistor 10. The first terminal of the fourth resistor 10 is used to receive pulse control signals. The first terminal of the fifth resistor 11 is connected to the base of the second transistor 17, and the second terminal of the fifth resistor 11 is connected to the emitter of the second transistor 17. The first terminal of the capacitor 12 is connected to the base of the second transistor 17, and the second terminal of the capacitor 12 is connected to the emitter of the second transistor 17.

[0057] In some embodiments, the second controlled switch 9 is an isolating switch. The control circuit 4 further includes a third controlled switch 13. The control terminal of the isolating switch is configured to receive pulse control signals through the third controlled switch 13.

[0058] Wherein: the control terminal of the third controlled switch 13 is configured to receive pulse control signals; the first terminal of the third controlled switch 13 is connected to the control terminal of the disconnecting switch and is configured to be connected to a preset voltage source, and the second terminal of the third controlled switch 13 is grounded; or, the first terminal of the third controlled switch 13 is configured to be connected to a preset voltage source, and the second terminal of the third controlled switch 13 is connected to the control terminal of the disconnecting switch and grounded.

[0059] Optionally, the control circuit 4 may include a first sub-voltage source and a second sub-voltage source. The first sub-voltage source is the voltage source of the control circuit 4, and the second sub-voltage source is a preset voltage source. The first sub-voltage source is the power supply.

[0060] Alternatively, the control circuit 4 may include a first sub-voltage source, which is both the voltage source of the control circuit 4 and a preset voltage source.

[0061] Alternatively, the disconnecting switch can be an optocoupler, an electromagnetic disconnecting switch, etc.

[0062] A disconnecting switch is generally divided into a control side and a controlled side. When the second controlled switch 9 is a disconnecting switch, its first and second terminals are the controlled side, and its control terminal is the control side. The first and second terminals of the second controlled switch 9 are connected or disconnected under the control of the control terminal.

[0063] In some embodiments, the control circuit 4 further includes a sixth resistor 14. The control terminal of the disconnect switch is connected to a preset voltage source through the sixth resistor 14.

[0064] For example, in combination Figure 3 As shown, the switching device 1 is a first MOSFET 15, the first controlled switch 5 is a first transistor 16, the second controlled switch 9 is an optocoupler 19, and the third controlled switch 13 is a third transistor 18. Specifically, the first MOSFET 15 is a P-type MOSFET, the first transistor 16 is an NPN transistor, and the third transistor 18 is an NPN transistor. The switching circuit can be configured such that: the drain of the first MOSFET 15 is connected to the load, and the source of the first MOSFET 15 is connected to the power supply. The first terminal of the first resistor 2 is connected to the source of the first MOSFET 15, and the second terminal of the first resistor 2 is connected to the gate of the first MOSFET 15. The first terminal of the second resistor 6 is connected to the first terminal of the first resistor 2. The collector of the first transistor 16 is connected to the second terminal of the second resistor 6, the emitter of the first transistor 16 is connected to the second terminal of the first resistor 2 and the anode of the diode 8, and the base of the first transistor 16 is connected to the first terminal of the third resistor 7, the cathode of the diode 8, and the third terminal of the optocoupler 19. The second terminal of the third resistor 7 is connected to the power supply. The fourth terminal of the optocoupler 19 is grounded, and the first terminal of the optocoupler 19 is connected to the second terminal of the sixth resistor 14. The second terminal of the optocoupler 19 is also connected to the collector of the third transistor 18. The first terminal of the sixth resistor 14 is connected to a preset voltage source. The emitter of the third transistor 18 is grounded, and the base of the third transistor 18 is connected to the second terminal of the fourth resistor 10. The first terminal of the fourth resistor 10 is used to receive pulse control signals. The first terminal of the fifth resistor 11 is connected to the base of the third transistor 18, and the second terminal of the fifth resistor 11 is connected to the emitter of the third transistor 18. The first terminal of the capacitor 12 is connected to the base of the third transistor 18, and the second terminal of the capacitor 12 is connected to the emitter of the third transistor 18.

[0065] For example, switching device 1 is a first MOSFET, first controlled switch 5 is a second MOSFET, second controlled switch 9 is an optocoupler, and third controlled switch 13 is a third transistor. The first MOSFET is a P-type MOSFET, the second MOSFET is an N-type MOSFET, and the third transistor is an NPN type. The switching circuit can be as follows: the drain of the first MOSFET is connected to the load, and the source of the first MOSFET is connected to the power supply. The first terminal of the first resistor 2 is connected to the source of the first MOSFET, and the second terminal of the first resistor 2 is connected to the gate of the first MOSFET. The first terminal of the second resistor 6 is connected to the first terminal of the first resistor 2. The drain of the second MOSFET is connected to the second terminal of the second resistor 6, the source of the second MOSFET is connected to the second terminal of the first resistor 2 and the anode of the diode 8, and the gate of the second MOSFET is connected to the first terminal of the third resistor 7, the cathode of the diode 8, and the third terminal of the optocoupler. The second terminal of the third resistor 7 is connected to the power supply. The fourth terminal of the optocoupler is grounded. The first terminal of the optocoupler is connected to the second terminal of the sixth resistor 14, and the second terminal of the optocoupler is connected to the collector of the third transistor. The first terminal of the sixth resistor 14 is used to connect to a preset voltage source. The emitter of the third transistor is grounded, and the base of the third transistor is connected to the second terminal of the fourth resistor 10. The first terminal of the fourth resistor 10 is used to receive pulse control signals. The first terminal of the fifth resistor 11 is connected to the base of the third transistor, and the second terminal of the fifth resistor 11 is connected to the emitter of the third transistor. The first terminal of the capacitor 12 is connected to the base of the third transistor, and the second terminal of the capacitor 12 is connected to the emitter of the third transistor.

[0066] For example, switching device 1 is a first MOSFET, first controlled switch 5 is a second MOSFET, second controlled switch 9 is an optocoupler, and third controlled switch 13 is a third MOSFET. The first MOSFET is a P-type MOSFET, the second MOSFET is an N-type MOSFET, and the third MOSFET is an N-type MOSFET. The switching circuit can be as follows: the drain of the first MOSFET is connected to the load, and the source of the first MOSFET is connected to the power supply. The first terminal of the first resistor 2 is connected to the source of the first MOSFET, and the second terminal of the first resistor 2 is connected to the gate of the first MOSFET. The first terminal of the second resistor 6 is connected to the first terminal of the first resistor 2. The drain of the second MOSFET is connected to the second terminal of the second resistor 6, the source of the second MOSFET is connected to the second terminal of the first resistor 2 and the anode of the diode 8, and the gate of the second MOSFET is connected to the first terminal of the third resistor 7, the cathode of the diode 8, and the third terminal of the optocoupler. The second terminal of the third resistor 7 is connected to the power supply. The fourth terminal of the optocoupler is grounded. The first terminal of the optocoupler is connected to the second terminal of the sixth resistor 14, and the second terminal of the optocoupler is connected to the drain of the third MOSFET. The first terminal of the sixth resistor 14 is used to connect to a preset voltage source. The source of the third MOSFET is grounded, and the gate of the third MOSFET is connected to the second terminal of the fourth resistor 10. The first terminal of the fourth resistor 10 is used to receive pulse control signals. The first terminal of the fifth resistor 11 is connected to the gate of the third MOSFET, and the second terminal of the fifth resistor 11 is connected to the source of the third MOSFET. The first terminal of the capacitor 12 is connected to the gate of the third MOSFET, and the second terminal of the capacitor 12 is connected to the source of the third MOSFET.

[0067] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A switching circuit, characterized in that, include: A switching device having parasitic capacitance, a first terminal of the switching device being connected to a load; and a second terminal of the switching device being connected to a power supply. A first resistor, the first end of which is connected to the second end of the switching device, and the second end of which is connected to the control terminal of the switching device; A discharge section is connected in parallel with the first resistor; the discharge section includes a first controlled switch connected in series with a second resistor. A diode, wherein the positive terminal of the diode is connected to the second terminal of the first controlled switch, and the negative terminal of the diode is connected to the control terminal of the first controlled switch; The control circuit is connected to the control terminal of the switching device and the control terminal of the first controlled switch, respectively. The control circuit is used to control the first controlled switch to be turned on when the switching device is turned off.

2. The switching circuit according to claim 1, characterized in that, The switching circuit also includes: The third resistor has its first end connected to the control terminal of the first controlled switch, and its second end connected to the voltage source of the control circuit, which is the power supply.

3. The switching circuit according to claim 1, characterized in that, The switching device has the opposite polarity to the first controlled switch, and the control circuit includes: The second controlled switch has its control terminal configured to receive pulse control signals. The first terminal of the second controlled switch is connected to the control terminal of the switching device and the control terminal of the first controlled switch. The second terminal of the second controlled switch is grounded.

4. The switching circuit according to claim 3, characterized in that, The control circuit further includes: A fourth resistor, through which the second controlled switch is configured to receive pulse control signals.

5. The switching circuit according to claim 3, characterized in that, The control circuit further includes: A capacitor, wherein the first end of the capacitor is connected to the control terminal of the second controlled switch, and the second end of the capacitor is connected to the second terminal of the second controlled switch.

6. The switching circuit according to claim 5, characterized in that, The control circuit further includes: The fifth resistor has its first end connected to the control terminal of the second controlled switch, and its second end connected to the second terminal of the second controlled switch.

7. The switching circuit according to any one of claims 4 to 6, characterized in that, The second controlled switch is an isolating switch, and the control circuit further includes: The third controlled switch; the control terminal of the isolating switch is configured to receive pulse control signals through the third controlled switch; wherein: The control terminal of the third controlled switch is configured to receive pulse control signals; The first terminal of the third controlled switch is connected to the control terminal of the disconnecting switch and configured to be connected to a preset voltage source, and the second terminal of the third controlled switch is grounded; or, the first terminal of the third controlled switch is configured to be connected to a preset voltage source, and the second terminal of the third controlled switch is connected to the control terminal of the disconnecting switch and grounded.

8. The switching circuit according to claim 7, characterized in that, The control circuit further includes a sixth resistor, through which the control terminal of the disconnect switch is connected to the preset voltage source.

9. The switching circuit according to any one of claims 4 to 6, characterized in that, The control circuit also includes: A processor is connected to the control terminal of the second controlled switch; the processor is used to provide pulse control signals; or, A signal generator is connected to the control terminal of the second controlled switch; the signal generator is used to provide pulse control signals.

10. An energy storage device, characterized in that, Includes the switching circuit as described in any one of claims 1 to 9.

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