Auxiliary power supply circuit of switching control device and switching circuit of electronic device

Abstract

The present invention discloses an auxiliary power supply circuit of a switching control device and an electronic device switching circuit. The auxiliary power supply circuit of the switching control device comprises an RC circuit and an energy-taking circuit; one end of the RC circuit is connected to one end of a first electronic device, and the other end of the RC circuit is connected to a first input end of the energy-taking circuit; the second input end of the energy-taking circuit is connected to the other end of the first electronic device, and the output end of the energy-taking circuit is connected to a switching control device; the switching control device is a device for controlling the switching of a second electronic device connected in series with the first electronic device. The present invention can ensure the working stability of the switching control device.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and in particular to an auxiliary power supply circuit of a switching control device and an electronic device switching circuit. Background Art

[0002] In power systems, it is usually necessary to switch on and off electronic devices. Taking capacitor switching as an example, since the electrical equipment in the power system will generate reactive power when in use, and it is usually inductive, it will reduce the capacity utilization efficiency of the power supply. This can be improved by appropriately adding capacitors to the system for capacitor compensation; therefore, capacitor switching test circuits are often designed for capacitor compensation.

[0003] The switching of electronic devices is generally controlled by a switching control device. For example, in a capacitor switching test circuit, the remaining capacitor and the capacitor to be tested are connected in series to obtain a capacitor bank. The switching of the capacitor to be tested is controlled by a switching control device to change the capacitance of the capacitor bank. This experimental circuit can instantly increase the capacitance, causing the capacitor to resonate with the external inductor, thereby raising the voltage value of the main circuit.

[0004] At present, generally, an energy taking unit is connected in parallel to the switched electronic device (such as the capacitor under test) to take energy, so as to supply power to the driving unit of the switching control device to drive the driving unit to work. However, after the electronic device under test is short-circuited, the voltage at both ends is zero. In this process, the energy taking unit cannot replenish energy to the driving unit, and there is a problem of power supply interruption, resulting in poor working stability of the switching control device. Summary of the invention

[0005] The technical problem to be solved by the present invention is that in the prior art, there is a problem of power failure in supplying power to a switching control device, resulting in poor working stability of the switching control device.

[0006] In order to solve the above technical problems, the present invention provides an auxiliary power supply circuit of a switching control device and an electronic device switching circuit.

[0007] An auxiliary power supply circuit of a switching control device, comprising an RC circuit and an energy taking circuit;

[0008] One end of the RC circuit is connected to one end of the first electronic device, and the other end of the RC circuit is connected to the first input end of the energy extraction circuit; the second input end of the energy extraction circuit is connected to the other end of the first electronic device, and the output end of the energy extraction circuit is connected to a switching control device; the switching control device is a device for controlling the switching of a second electronic device connected in series with the first electronic device.

[0009] In one embodiment, the RC circuit includes a first resistor and a first capacitor. After the first resistor and the first capacitor are connected in series, the other end of the first resistor is connected to one end of the first electronic device, and the other end of the first capacitor is connected to the first input end of the energy extraction circuit.

[0010] In one of the embodiments, the energy extraction circuit includes a rectifier circuit and a DC / DC module;

[0011] The first input end of the rectifier circuit serves as the first input end of the energy extraction circuit and is used to connect the RC circuit. The second input end of the rectifier circuit serves as the second input end of the energy extraction circuit and is used to connect the first electronic device. The output end of the rectifier circuit is connected to the input end of the DC / DC module. The output end of the DC / DC module serves as the output end of the energy extraction circuit and is used to connect the switching control device.

[0012] In one of the embodiments, the rectifier circuit includes a first diode, a second diode, a thyristor, and a second capacitor;

[0013] The first diode and the thyristor are connected in parallel, and the cathode of the first diode and the anode of the thyristor are connected as the first input end of the rectifier circuit, and the anode of the first diode and the cathode of the thyristor are connected as the second input end of the rectifier circuit;

[0014] The anode of the second diode is connected to the anode of the thyristor, the cathode of the second diode is connected to one end of the second capacitor, and the common end is connected to the input end of the DC / DC module as the first output end of the rectifier circuit, and the other end of the second capacitor is connected to the cathode of the thyristor and connected to the input end of the DC / DC module as the second output end of the rectifier circuit.

[0015] An electronic device switching circuit comprises: a first electronic device, a second electronic device, a switching control device and an auxiliary power supply circuit of the switching control device;

[0016] After the first electronic device and the second electronic device are connected in series, the first electronic device and the second electronic device are connected to the positive electrode and the negative electrode of the power supply respectively;

[0017] The auxiliary power supply circuit is connected in parallel to both ends of the first electronic device and is connected to the switching control device, and is used to output voltage to the switching control device;

[0018] The switching control device is connected in parallel to two ends of the second electronic device and is used to control the switching of the second electronic device.

[0019] In one embodiment, there are multiple first electronic devices; the auxiliary power supply circuit is connected in parallel to any one of the first electronic devices, or is connected in parallel to multiple first electronic devices.

[0020] In one embodiment, the electronic device switching circuit further includes an absorption circuit, and the absorption circuit is connected in parallel with the second electronic device and the switching control device.

[0021] In one of the embodiments, the switching control device includes a driving unit and a power switch device, the driving unit is connected to the auxiliary power supply circuit and the power switch device, and the power switch device is connected in parallel to two ends of the second electronic device.

[0022] In one embodiment, the driving unit includes a first driving unit and a second driving unit, and the power switch device includes a first power switch device and a second power switch device;

[0023] The first driving unit is connected to the auxiliary power supply circuit and the first power switch device, and the second driving unit is connected to the auxiliary power supply circuit and the second power switch device; the first power switch device and the second power switch device are anti-parallel connected at both ends of the second electronic device.

[0024] In one of the embodiments, the power switch device is a fully controlled power semiconductor device.

[0025] Compared with the prior art, one or more embodiments of the above scheme may have the following advantages or beneficial effects:

[0026] The RC circuit and the energy taking circuit are connected in series and then in parallel at both ends of the first electronic device, so that the auxiliary power supply circuit of the switching control device is connected in parallel to the two ends of the first electronic device, and the auxiliary power supply circuit takes energy and supplies it to the switching control device connected in parallel to the second electronic device, and the switching control device controls the switching of the second electronic device in the loop in which the first electronic device and the second electronic device are connected in series; energy is taken from both ends of the first electronic device, because the voltage of the first electronic device is always present during the switching control process of the switching control device, the stable operation of the energy taking can be guaranteed, so that the switching control device can be continuously powered to ensure the working stability of the switching control device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The scope of the present disclosure may be better understood by reading the following detailed description of exemplary embodiments in conjunction with the accompanying drawings. The drawings included are:

[0028] Figure 1 The circuit schematic diagram of the capacitor switching test circuit is shown;

[0029] Figure 2is a circuit structure block diagram of an auxiliary power supply circuit of a switching control device in one embodiment;

[0030] Figure 3 is a circuit schematic diagram of an energy extraction circuit in one embodiment;

[0031] Figure 4 is a circuit structure block diagram of an electronic device switching circuit in one embodiment;

[0032] Figure 5 is a circuit schematic diagram of an electronic device switching circuit in one embodiment;

[0033] Figure 6 It is a circuit schematic diagram of a capacitor switching test circuit using an existing energy-taking method;

[0034] Figure 7 The circuit schematic diagram of a capacitor switching test circuit in an alternative scheme is shown below;

[0035] Figure 8 This is the circuit schematic diagram of the capacitor switching test circuit in another alternative solution. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention clearer, the implementation method of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0037] Capacitor switching test circuit Figure 1 As shown, capacitors are connected in series to obtain a capacitor group, and the capacitance of the capacitor group can be changed by switching the capacitor to be measured. This experimental circuit can instantly increase the capacitance, allowing the capacitor to resonate with the external inductor, thereby raising the voltage value of the main circuit. In the prior art, an energy acquisition unit is connected in parallel at both ends of the capacitor to be measured, and the energy acquisition unit draws energy from the capacitor to be measured to supply power to the power semiconductor device. This energy acquisition method has the problem of disconnection. When the capacitor to be measured is short-circuited, the voltage at both ends is zero. During this process, the energy acquisition unit cannot replenish energy to the power semiconductor device, resulting in poor working stability of the drive control device.

[0038] Based on this, the present application provides an auxiliary power supply circuit of a switching control device and an electronic device switching circuit, which can avoid the problem of power supply failure.

[0039] like Figure 2As shown, an auxiliary power supply circuit of a switching control device is provided, including an RC circuit 211 and an energy extraction circuit 212; one end of the RC circuit 211 is connected to one end of the first electronic device, and the other end of the RC circuit 211 is connected to the first input end of the energy extraction circuit 212; the second input end of the energy extraction circuit 212 is connected to the other end of the first electronic device 220, and the output end of the energy extraction circuit 212 is connected to the switching control device 240. The first electronic device and the second electronic device are connected in series and then connected to the power supply respectively, the first electronic device and the second electronic device are connected in series in the loop, and the switching control device is connected in parallel at both ends of the second electronic device; the switching control device is a device for controlling the switching with the second electronic device. The RC circuit 211 is designed for energy extraction, and is connected in parallel to the first electronic device 220 together with the energy extraction circuit 212. The RC circuit 211 divides the voltage from the power supply and stabilizes the voltage to supply the energy extraction circuit 212, and the energy extraction circuit 212 outputs a stable voltage to the switching control device 240.

[0040] Taking the first electronic device and the second electronic device as capacitors as an example, the logic of the auxiliary power supply circuit of the switching control device to take energy to supply power to the switching control device is: after the power is turned on, the two capacitors are charged, the auxiliary power supply unit supplies power to the switching control device, and the switching control device is in the off state; the switching control device receives a strong trigger signal, turns on to bypass the parallel capacitor, and the main circuit voltage is all added to the capacitor of the first electronic device; when the second electronic device needs to be cut out, the switching control device is turned off, and the capacitor of the second electronic device is reconnected to the main circuit.

[0041] The auxiliary power supply circuit of the switching control device is connected in series with the RC circuit 211 and the energy taking circuit 212 and then connected in parallel to the two ends of the first electronic device, so that the auxiliary power supply circuit of the switching control device is connected in parallel to the two ends of the first electronic device, and the auxiliary power supply circuit takes energy and supplies it to the switching control device connected in parallel to the second electronic device, and the switching control device controls the switching of the second electronic device in the loop in which the first electronic device and the second electronic device are connected in series; energy is taken from the two ends of the first electronic device, because the voltage of the first electronic device is always present during the switching control process of the switching control device, the stable operation of the energy taking can be guaranteed, so that the switching control device can be continuously powered to ensure the working stability of the switching control device.

[0042] In one embodiment, the RC circuit includes a first resistor and a first capacitor. After the first resistor and the first capacitor are connected in series, the other end of the first resistor is connected to one end of the first electronic device, and the other end of the first capacitor is connected to the first input end of the energy extraction circuit 212. The RC circuit is formed by connecting a resistor and a capacitor in series, which is simple and easy to implement.

[0043] In one embodiment, the energy extraction circuit 212 includes a rectifier circuit and a DC / DC module; the first input end of the rectifier circuit is used as the first input end of the energy extraction circuit 212, and is used to connect the RC circuit 211; the second input end of the rectifier circuit is used as the second input end of the energy extraction circuit 212, and is used to connect the first electronic device; the output end of the rectifier circuit is connected to the input end of the DC / DC module; the output end of the DC / DC module is used as the output end of the energy extraction circuit 212, and is used to connect the switching control device. The rectifier circuit is used for rectification, and then the DC / DC module outputs a stable and appropriate voltage to the switching control device.

[0044] In one embodiment, if Figure 3 As shown, the rectifier circuit includes a first diode D1, a second diode D2, a thyristor T0 and a second capacitor C1. The first diode D1 and the thyristor T0 are connected in parallel, and the cathode of the first diode D1 and the anode of the thyristor T0 are connected as the first input end of the rectifier circuit, and the anode of the first diode D1 and the cathode of the thyristor T0 are connected as the second input end of the rectifier circuit. The anode of the second diode D2 is connected to the anode of the thyristor T0, and the cathode of the second diode D2 is connected to one end of the second capacitor C1, and the common end is connected to the input end of the DC / DC module as the first output end of the rectifier circuit, and the other end of the second capacitor is connected to the cathode of the thyristor T0, as the second output end of the rectifier circuit, connected to the input end of the DC / DC module.

[0045] Figure 3 In the figure, the GU gate drive unit is the drive unit of the switching control device. Through two diodes, a thyristor, a capacitor, and a DC / DC module, the thyristor is only turned on at the set internal voltage. Taking the power supply as AC as an example, the second capacitor C1 is charged when the main circuit voltage comes in the positive half cycle, and passes through the first diode D1 when the negative half axis comes. The thyristor T0 controls the maximum voltage. The voltage output by the second capacitor C1 is converted by the DC / DC module voltage and then outputs a stable isolation voltage to supply GU, and GU is powered.

[0046] In one embodiment, Figure 4 As shown, an electronic device switching circuit is provided, comprising: an auxiliary power supply circuit 210, a first electronic device 220, a second electronic device 230 and a switching control device 240. The first electronic device 220 and the second electronic device 230 may be the same electronic device, and the second electronic device 230 is an electronic device that needs to be controlled to be switched; for example, the first electronic device 220 and the second electronic device 230 may be capacitors.

[0047] After the first electronic device 220 and the second electronic device 230 are connected in series, the first electronic device 220 and the second electronic device 230 are connected to the positive and negative electrodes of the power supply, respectively. Specifically, one end of the first electronic device 220 is connected to the positive / negative electrode of the power supply, the other end of the first electronic device 220 is connected to one end of the second electronic device 230, and the other end of the second electronic device 230 is connected to the negative / positive electrode of the power supply, and the first electronic device 220 and the second electronic device 230 are in a loop.

[0048] The auxiliary power supply circuit 210 is connected in parallel to both ends of the first electronic device 220 and is connected to the switching control device 240, and is used to output voltage to the switching control device 240. The switching control device 240 is connected in parallel to both ends of the second electronic device 230, and is used to control the switching of the second electronic device 230. Specifically, the switching control device 240 receives instructions and controls the second electronic device 230 to be put into or cut out of the circuit by adjusting the switch state.

[0049] The above-mentioned electronic device switching circuit is achieved by connecting the auxiliary power supply circuit 210 in parallel to the first electronic device 220, and the auxiliary power supply circuit 210 takes energy and supplies it to the switching control device 240 connected in parallel to the second electronic device 230; energy is taken from both ends of the first electronic device 220, because the voltage of the first electronic device 220 is always present during the switching control process of the switching control device 240, the stable operation of energy taking can be guaranteed, so that the switching control device 240 can be continuously powered, thereby ensuring the working stability of the switching control device 240.

[0050] When applied to the switching of capacitors, the above-mentioned electronic device switching circuit solves the problem that when the series capacitor group switches the measured capacitor, the power supply to the switching control device cannot be maintained due to the capacitor short circuit. The characteristic is that the auxiliary power supply circuit 210 for powering the switching control device is itself in the main circuit, which is simple and stable, does not require other external power supplies, and does not require additional isolation. The entire circuit is refined and complete, and the safety and operability are improved.

[0051] In one embodiment, there are multiple first electronic devices 220; the auxiliary power supply circuit 210 is connected in parallel to any first electronic device 220. Alternatively, the auxiliary power supply circuit 210 is connected in parallel to multiple first electronic devices 220, for example, two first electronic devices 220 are connected in series, one end of the auxiliary power supply circuit 210 is connected to an end of the first electronic device 220 away from the second electronic device 220, and the other end of the auxiliary power supply circuit 210 is connected to an end of the second electronic device 220 away from the first electronic device 220.

[0052] For example, taking the first electronic device 220 as a capacitor, there may be more than one capacitor, and the auxiliary power supply circuit 210 can be selected to be connected in parallel to any one of the capacitors, because the voltage across the capacitor will only increase but not decrease compared to before it is turned on.

[0053] In one embodiment, reference Figure 5 The electronic device switching circuit further includes an absorption circuit 250, which is connected in parallel with the second electronic device 230 and the switching control device 240. The absorption circuit 250 and the second electronic device 230 ( Figure 3 The capacitor to be measured is connected in parallel as an absorption and damping unit of the switching control device 240.

[0054] In one embodiment, the absorption circuit 250 includes a second resistor and a third capacitor, such as Figure 5 As shown, the second resistor and the third capacitor are connected in series, and after the series connection, the end of the second resistor away from the third capacitor is connected to one end of the second electronic device 230, and the end of the third capacitor away from the second resistor is connected to the other end of the second electronic device 230.

[0055] In one embodiment, the switching control device 240 includes a driving unit and a power switch device. The driving unit is connected to the auxiliary power supply circuit 210 and the power switch device. The power switch device is connected in parallel to two ends of the second electronic device 230 .

[0056] The driving unit is used to drive the power switch device to work. The power switch device is a power semiconductor device that can be turned on or off under the action of the driving unit.

[0057] In one embodiment, the driving unit includes a first driving unit and a second driving unit, and the power switching device includes a first power switching device and a second power switching device; the first driving unit is connected to the auxiliary power supply circuit 210 and the first power switching device, and the second driving unit is connected to the auxiliary power supply circuit 210 and the second power switching device; the first power switching device and the second power switching device are anti-parallel connected at both ends of the second electronic device 230.

[0058] For example Figure 5 As shown, the first drive unit is GU1, the second drive unit is GU2, the first power switch device is T1, the second power switch device is T2, GU1 is connected to the auxiliary power supply unit 210 and T1, and GU2 is connected to the auxiliary power supply unit 210 and T2; correspondingly, the auxiliary power supply circuit 210 leads to two branches to supply power to the two drive units at the same time. The structure of two power switch devices in anti-parallel connection is adopted to facilitate switching control.

[0059] In one embodiment, the power switch device is a fully controlled power switch device. When the power source is an AC power source, the power switch device is a fully controlled power switch device that can withstand bidirectional voltage. For example Figure 5 As shown, the power switch device is an IGCT. It can be understood that in other embodiments, the IGCT can be replaced by any controllable power semiconductor device, such as an IGBT, a thyristor, etc.

[0060] Take IGCT as a power switch device, the first electronic device 220 as a residual capacitor, and the second electronic device 230 as a capacitor to be measured as an example, wherein: the auxiliary power supply circuit 210 is connected in parallel to the residual capacitor, and when the anti-parallel IGCT is controlled to be turned on, the capacitor to be measured is short-circuited, the capacitor energy quickly flows away from the IGCT, and the external power supply AC voltage is all added to the residual capacitor. The voltage across the residual capacitor increases, but it has no effect on the auxiliary power supply circuit 210, so that a stable power supply can be obtained to supply the gate drive unit GU of the IGCT.

[0061] The present invention can be applied to AC systems. If the prior art method of supplying power to the switching control device 240 is adopted, such as Figure 6 As shown, taking the use of IGCT as an example, two IGCTs (T1, T2) are connected in reverse parallel to the capacitor under test. When the capacitor under test is turned on, the capacitor under test is short-circuited, the main circuit current passes through the IGCT, and the gate drive unit of the IGCT obtains energy through the voltage across the capacitor and the RC absorption circuit. Among them: GU1 and GU2 are the gate drive units of T1 and T2 respectively. The AC power obtained from the voltage division at the capacitor under test is rectified and converted by the DC / DC module, and the output stable voltage is simultaneously supplied to the two anti-parallel IGCT gate drive units. GU1 and GU2 then supply power to the gate and cathode of the IGCT. The positive and negative poles of the IGCT are controlled to be turned on to short-circuit the capacitor under test, and the external voltage is all applied to the remaining capacitor, thereby achieving the experimental purpose. However, this energy extraction method has the problem of power supply interruption. After the capacitor under test is short-circuited, the voltage across the two ends is zero. In this process, the energy extraction cannot replenish energy to the gate drive unit. GU1 and GU2 will completely rely on their own internal energy storage capacitors to support the switchable time, which is not conducive to application. If the electronic device switching circuit provided by the present invention is applied, by connecting the auxiliary power supply unit in parallel at both ends of the remaining capacitor, it can be ensured that the GU can work normally and stably at any time.

[0062] refer to Figure 7 and Figure 8 , which are two alternatives for auxiliary power supply. Figure 7, the auxiliary power supply unit 210 is not used, and there is no need to connect an RC circuit in parallel to the remaining capacitor. Increase the capacitance of the energy storage capacitor on the IGCT drive board or add an additional energy storage capacitor, so that after the capacitor under test is short-circuited at the beginning of the experiment, that is, after the IGCT is disconnected from the external energy source, it can still rely on the energy storage capacitor (C2, C3) to maintain operation for a period of time. The disadvantage of this solution is that the IGCT is turned on for a short time, and C1 and C2 need a long time to charge. Figure 8 , no auxiliary power supply unit is used, and no RC circuit is connected in parallel to the remaining capacitor. Another power source is introduced from the outside to the controllable power switch device. The external power supply can be household electricity, generator or even battery, etc. The disadvantage is that the experimental components are bulky, inconvenient to operate and need to be isolated.

[0063] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] Although the embodiments disclosed in the present invention are as above, the contents described are only embodiments adopted for facilitating the understanding of the present invention and are not intended to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present invention, but the protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. An auxiliary power supply circuit of a switching control device, characterized in that: Including RC circuit and energy taking circuit; One end of the RC circuit is connected to one end of the first electronic device, and the other end of the RC circuit is connected to the first input end of the energy extraction circuit; the second input end of the energy extraction circuit is connected to the other end of the first electronic device, and the output end of the energy extraction circuit is connected to a switching control device; the switching control device is a device for controlling the switching of a second electronic device connected in series with the first electronic device, and the switching control device includes a driving unit and a power switching device, the driving unit is connected to an auxiliary power supply circuit and the power switching device, and the power switching device is connected in parallel to the two ends of the second electronic device.

2. The auxiliary power supply circuit according to claim 1, characterized in that: The RC circuit includes a first resistor and a first capacitor. After the first resistor and the first capacitor are connected in series, the other end of the first resistor is connected to one end of the first electronic device, and the other end of the first capacitor is connected to the first input end of the energy extraction circuit.

3. The auxiliary power supply circuit according to claim 1, characterized in that: The energy extraction circuit includes a rectifier circuit and a DC / DC module; The first input end of the rectifier circuit serves as the first input end of the energy extraction circuit and is used to connect the RC circuit. The second input end of the rectifier circuit serves as the second input end of the energy extraction circuit and is used to connect the first electronic device. The output end of the rectifier circuit is connected to the input end of the DC / DC module. The output end of the DC / DC module serves as the output end of the energy extraction circuit and is used to connect the switching control device.

4. The auxiliary power supply circuit according to claim 3, characterized in that: The rectifier circuit includes a first diode, a second diode, a thyristor and a second capacitor; The first diode and the thyristor are connected in parallel, and the cathode of the first diode and the anode of the thyristor are connected as the first input end of the rectifier circuit, and the anode of the first diode and the cathode of the thyristor are connected as the second input end of the rectifier circuit; The anode of the second diode is connected to the anode of the thyristor, the cathode of the second diode is connected to one end of the second capacitor, and the common end connected to the cathode of the second diode and one end of the second capacitor serves as the first output end of the rectifier circuit connected to the input end of the DC / DC module, and the other end of the second capacitor is connected to the cathode of the thyristor and serves as the second output end of the rectifier circuit connected to the input end of the DC / DC module.

5. An electronic device switching circuit, characterized in that: include: A first electronic device, a second electronic device, a switching control device, and an auxiliary power supply circuit of the switching control device according to any one of claims 1 to 4; After the first electronic device and the second electronic device are connected in series, the first electronic device and the second electronic device are connected to the positive electrode and the negative electrode of the power supply respectively; The auxiliary power supply circuit is connected in parallel to both ends of the first electronic device and is connected to the switching control device, and is used to output voltage to the switching control device; The switching control device is connected in parallel to two ends of the second electronic device and is used to control the switching of the second electronic device.

6. The electronic device switching circuit according to claim 5, characterized in that: There are multiple first electronic devices; the auxiliary power supply circuit is connected in parallel to any one of the first electronic devices, or is connected in parallel to multiple first electronic devices.

7. The electronic device switching circuit according to claim 5, characterized in that: It also includes an absorption circuit, which is connected in parallel with the second electronic device and the switching control device.

8. The electronic device switching circuit according to claim 5, characterized in that: The driving unit includes a first driving unit and a second driving unit, and the power switch device includes a first power switch device and a second power switch device; The first driving unit is connected to the auxiliary power supply circuit and the first power switch device, and the second driving unit is connected to the auxiliary power supply circuit and the second power switch device; the first power switch device and the second power switch device are anti-parallel connected at both ends of the second electronic device.

9. The electronic device switching circuit according to claim 5, characterized in that: The power switch device is a fully controlled power semiconductor device.

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