Power supply switch and power supply changeover switch device based on a reactor

Abstract

The application belongs to the technical field of power switch design, and discloses a power switch based on a reactor and a power switch device, which comprises: a primary winding of the reactor; a switching winding module having switching windings at a secondary side, homonymous ends of the i switching winding being connected to a first end of the switching winding module through i half-controlled switches; a heteronymous end of a front switching winding being connected to a homonymous end of a rear switching winding; a regulation winding module having a regulation winding at the secondary side, a first fully-controlled switch being connected between the first end of the switching winding module and a heteronymous end of the regulation winding, a second fully-controlled switch being connected between homonymous ends and the heteronymous end of the regulation winding, and the homonymous end of the regulation winding being connected to the first end of the switching winding module. The application can control the rapid opening and closing of the line without requiring switching operation and without generating line pipe pressure drop, thereby further realizing the rapid and efficient switching between the main power supply and the standby power supply.

Description

Technical Field

[0001] This invention belongs to the technical field of power switch design, and more specifically, relates to a power switch and power switching device based on a reactor. Background Technology

[0002] In power supply systems for critical loads requiring extremely high power reliability (such as data centers, important production lines, and hospital operating rooms), a dual-power supply architecture with a main power supply and a backup power supply is typically used. When the main power supply experiences a voltage drop or power interruption due to faults, maintenance, or other reasons, it is necessary to quickly and reliably switch the load to the backup power supply to ensure continuous power supply. The core component for achieving power switching is the power switch. By controlling the on / off state of the main power supply switch and the backup power supply switch, power switching is achieved.

[0003] In traditional power switching schemes, power switches mainly rely on mechanical circuit breakers or contactors. However, the switching action of mechanical switches generates electric arcs, and the switching speed is usually slow (typically tens to hundreds of milliseconds). Fast-acting arc-extinguishing circuit breakers are expensive. In addition, mechanical switches may generate operational overvoltages and inrush currents during opening and closing, which can impact load equipment and the power grid itself.

[0004] Solid-state switching devices based on power electronic devices utilize fully or semi-controlled devices such as IGBTs and thyristors to achieve arc-free, rapid power switching, reducing switching time to the millisecond level. However, this type of solution suffers from a voltage drop across the switching transistor in the power supply line when the switch is closed, leading to a decrease in the voltage at the load supply end and increased line losses.

[0005] Hybrid power switches connect mechanical switches in parallel with power electronic devices, avoiding the problem of voltage drop between switches in the circuit. However, this solution requires switching between power electronic devices and mechanical switches, resulting in a longer overall power switching time.

[0006] Therefore, there is an urgent need to propose a power switch solution that does not require switching operations and does not generate line pipe voltage drop, so as to achieve fast and efficient switching between main power supply and backup power supply. Summary of the Invention

[0007] In view of the above-mentioned defects or improvement needs of the prior art, the present invention provides a power switch and power switching device based on a reactor, the purpose of which is to control the rapid opening and closing of the line without switching operation and without generating line voltage drop, thereby further realizing the rapid and efficient switching between the main power supply and the backup power supply.

[0008] To achieve the above objectives, this invention is proposed.

[0009] According to a first aspect of the present invention, a reactor-based power switch is provided, comprising: A primary winding, located on the primary side of the reactor, has two ends that serve as the two ends of the power switch; A switching winding module includes first to Nth switching windings and first to Nth semi-controlled switches. Each switching winding is located on the secondary side of the reactor. The same-name terminal of the i-th switching winding is connected to the start terminal of the switching winding module through the i-th semi-controlled switch, i=1,2,...,N. In the first to Nth switching windings, the opposite-name terminal of the previous switching winding is connected to the same-name terminal of the next switching winding, and the opposite-name terminal of the Nth switching winding is connected to the start terminal of the switching winding module. Each semi-controlled switch can be directly turned on by applying a conduction signal and turned off when no conduction signal is applied and a reverse voltage is applied. The regulating winding module includes a first fully controlled switch, a second fully controlled switch, and a regulating winding. The regulating winding is located on the secondary side of the reactor. The first fully controlled switch is connected between the first end of the switching winding module and the opposite end of the regulating winding. The second fully controlled switch is connected between the same-name end and the opposite-name end of the regulating winding. The same-name end of the regulating winding is connected to the first end of the switching winding module.

[0010] According to a second aspect of the present invention, a reactor-based power switching device is provided, comprising a main power switch, a backup power switch, and a switching module. The main power switch is used to control the connection and disconnection between the main power supply and the load, and the backup power switch is used to control the connection and disconnection between the backup power supply and the load. Both the main power switch and the backup power switch are power switches as described above. The switching module is used to detect the status of the main power supply and, when a fault is detected in the main power supply, to control the main power switch to send a power disconnect signal to control the main power switch to disconnect and to send a power on signal to the backup power switch to control the backup power switch to connect. Controlling the main power switch to disconnect includes: first turning off the second full control switch, then stopping the application of conduction signals to the first to Nth half control switches and turning on the first full control switch, wherein the regulating winding automatically applies reverse voltage to the first to Nth half control switches, the first to Nth half control switches are turned off when there is no conduction signal and a reverse voltage is applied, and finally turning off the first full control switch. Controlling the backup power switch to turn on includes: turning on the first to Nth half-control switches and the second full-control switch.

[0011] Overall, compared with the prior art, the technical solutions conceived in this invention have the following beneficial effects.

[0012] 1. The power switch based on a reactor provided by this invention has a reactor as its main structure. The primary winding of the reactor serves as the connection terminal of the switch. A switching winding module and a regulating winding module are constructed based on the secondary winding of the reactor. Each switching winding in the switching winding module is controlled by its corresponding half-controlled switch, and the regulating winding in the regulating winding module is controlled by a first fully controlled switch and a second fully controlled switch. Based on the above structural design, the connection and switching of the secondary switching winding and regulating winding can be controlled by adjusting the half-controlled switch and the fully controlled switch. This allows for rapid switching of the equivalent impedance of the primary side of the reactor between the excitation reactance and the leakage reactance, achieving millisecond-level, arc-free, and smooth switching of the power supply line. This power switch does not involve switching operations and does not directly control the connection and switching of the line through the switching transistor. Instead, it controls the connection and switching of the line by adjusting the impedance of the reactor. Therefore, it does not generate line voltage drop, avoiding steady-state voltage sag and additional losses.

[0013] 2. The reactor-based power switching device provided by this invention has a main power switch for controlling the connection and disconnection between the main power supply and the load, and a standby power switch for controlling the connection and disconnection between the standby power supply and the load. Since both the main power switch and the standby power switch adopt the power switch proposed in this invention, rapid switching between the main power supply and the standby power supply can be achieved under the control of the switching module. It also has comprehensive advantages such as no arc, no voltage drop, no impact, simple structure and controllable cost, providing an efficient and economical solution for continuous power supply of critical loads. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a reactor-based power switch according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a reactor-based power switching device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the switching module in one embodiment of the present invention; Figure 4 This is a schematic diagram of the main power disconnection signal generation submodule in one embodiment of the present invention; Figure 5 This is a schematic diagram of the backup power supply connection signal generation submodule in one embodiment of the present invention; Figure 6 This is a flowchart illustrating the action of a power disconnection signal controlling the main power switch to disconnect in one embodiment of the present invention. Figure 7 This is a flowchart illustrating the action of controlling the backup power switch to be turned on by a power-on signal in one embodiment of the present invention. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0016] In a first aspect, the present invention claims a power switch based on a reactor.

[0017] like Figure 1 The diagram shown is a schematic representation of a reactor-based power switch according to an embodiment of the present invention. The main structure of the power switch is a reactor, specifically including: a primary winding located on the primary side of the reactor; and a switching winding module comprising first to Nth switching windings and first to Nth semi-controlled switches. Each switching winding is located on the secondary side of the reactor, and the corresponding terminal of the i-th switching winding is connected to the i-th semi-controlled switch. Connected to the start end of the switching winding module, i=1,2,...,N; in the first to Nth switching windings, the opposite-named end of the previous switching winding is connected to the same-named end of the next switching winding, and the opposite-named end of the Nth switching winding is connected to the start end of the switching winding module. Each semi-controlled switch can be directly turned on by applying a conduction signal and turned off when no conduction signal is applied and a reverse voltage is applied; the regulating winding module includes a first fully controlled switch. Second full control switch The regulating winding is located on the secondary side of the reactor, and the first fully controlled switch... The second fully controllable switch is connected between the first end of the switching winding module and the opposite end of the control winding. It is connected between the same-named and different-named ends of the control winding, and the same-named end of the control winding is connected to the start end of the switching winding module.

[0018] Understandably, a fully controlled switch is one whose on / off state can be directly controlled by a control signal sent to its control terminal. When an on signal is applied, the fully controlled switch can be directly turned on, and when an off signal is applied, the fully controlled switch can be directly turned off. A semi-controlled switch is one whose on / off state can be directly controlled by a control signal but cannot be directly controlled by a control signal. When an on signal is applied, the semi-controlled switch can be directly turned on, and when the on / off signal is removed, the semi-controlled switch can be turned off by changing the voltage between the input and output terminals of the switch.

[0019] By connecting the two ends of the primary winding of the reactor to the power source and the load respectively, the impedance of the primary winding of the reactor can be significantly changed by adjusting the switching winding module and the conduction or disconnection of the control winding module, thereby realizing the closing or opening of the power transmission line: When the full control switch Off, full control switch On / off, semi-controlled switch When the circuit is open, the power supply can be connected to the load, and the power supply can normally supply power to the load. If you need to disconnect the power, you can do the following: First, turn off the full control switch. Then stop feeding the semi-controlled switch. Apply a conduction signal to the control terminal and turn on the full control switch. At this time, the control winding will automatically switch to the semi-controlled switch. Applying reverse pressure causes the half-controlled switch to... Turn off, and finally turn off the full control switch. At this time, the full control switch , full control switch and semi-controlled switch When all are turned off, the reactor will generate a very large transformer excitation impedance, resulting in a very large power line impedance, making the line almost disconnected, thus disconnecting the power supply. If you need to reconnect the power, you can do the following: by turning on the half-control switch. Apply a conduction signal to the control terminal to enable the semi-controlled switch. Conduction, and through the full control switch Apply a conduction signal to the control terminal to enable the full control switch. When the circuit is turned on, the semi-controlled switch... , full control switch When all circuits are conducting, the reactor will generate leakage reactance, the power line impedance will be small, the line will be approximately conducting, and the power supply will be connected.

[0020] It should be noted that the number N of windings in the power switch can be flexibly set according to the actual circuit, as long as the switching function can be performed.

[0021] Therefore, the power switch based on a reactor provided by this invention has a reactor as its main structure. The primary winding of the reactor serves as the connection terminal of the switch. A switching winding module and a regulating winding module are constructed based on the secondary winding of the reactor. Each switching winding in the switching winding module is controlled by its corresponding half-controlled switch, and the regulating winding in the regulating winding module is controlled by a first fully controlled switch and a second fully controlled switch. Based on the structural design of the power switch, the connection and disconnection of the secondary winding can be controlled by adjusting the half-controlled switch and the fully controlled switch. This allows for rapid switching of the equivalent impedance of the primary side of the reactor between the magnetizing reactance and the leakage reactance, achieving millisecond-level, arc-free, and smooth switching of the power supply line. This power switch does not involve switching operations and does not directly control the connection and disconnection of the line through the switching transistor. Instead, it controls the connection and disconnection of the line by adjusting the impedance of the reactor. Therefore, it does not generate voltage drop in the line transistors, avoiding steady-state voltage dips and additional losses. Overall, the reactor-based power switch proposed in this invention provides a comprehensive advantage such as no arc, no voltage drop, no impact, simple structure, and controllable cost, while ensuring fast switching and high reliability. It offers an efficient and economical solution for continuous power supply to critical loads.

[0022] In one embodiment, the semi-controlled switch can be a bidirectional thyristor, which can be turned on by applying a sufficiently large trigger pulse to its gate G, and turned off when its main electrode is subjected to a reverse voltage.

[0023] In one embodiment, both the first fully controlled switch and the second fully controlled switch are insulated gate bipolar transistors (IGBTs).

[0024] In one embodiment, a capacitor is connected between the first fully controlled switch and the opposite terminal of the regulating winding. By connecting the capacitor, the voltage of the first fully controlled switch can be shared, preventing overvoltage from occurring in the fully controlled switch.

[0025] In one embodiment, the power switch internally includes a switch control module, which is used to perform a power disconnection operation upon receiving a power disconnection signal and a power connection operation upon receiving a power connection signal. The power disconnection operation includes: first turning off the second full-control switch; then stopping the application of conduction signals to the first to Nth half-control switches and turning on the first full-control switch; and finally turning off the first full-control switch after the control winding automatically applies reverse voltage to the first to Nth half-control switches, causing them to turn off. In other words, when the switch control module receives a power disconnection signal, it first turns off the full-control switch. Then stop feeding the semi-controlled switch. Apply a conduction signal to the control terminal and turn on the full control switch. At this time, the control winding will automatically switch to the semi-controlled switch. Applying reverse pressure causes the half-controlled switch to... Turn off, and finally turn off the full control switch. At this time, the full control switch , full control switch and semi-controlled switch All switches are turned off. The reactor will generate a very large transformer excitation impedance, resulting in a very high power line impedance, making the line approximately disconnected, thus disconnecting the power supply. The operation to turn on the power includes: applying a conduction signal to the first to Nth half-controlled switches to turn them on, and then applying a conduction signal to the second fully controlled switch. Apply a conduction signal to enable the second fully controlled switch When the circuit is turned on, the semi-controlled switch... , full control switch When both circuits are conducting, the power line impedance is relatively small, the line is approximately conductive, and the power supply is connected. In other words, by connecting to the semi-controlled switch... Apply a conduction signal to the control terminal to enable the semi-controlled switch. Conduction, and through the full control switch Apply a conduction signal to the control terminal to enable the full control switch. When the circuit is turned on, the semi-controlled switch... , full control switch When all circuits are conducting, the power line impedance is relatively small, the line is approximately conducting, and the power supply is connected.

[0026] Secondly, the present invention also claims a power switching device based on a reactor.

[0027] like Figure 2 The diagram shows a schematic of a reactor-based power switching device according to an embodiment of the present invention. It includes a main power switch, a backup power switch, and a switching module. The main power switch controls the connection between the main power supply and the load, and the backup power switch controls the connection between the backup power supply and the load. Both the main power switch and the backup power switch are power switches as described above. The switching module detects the status of the main power supply and, when a main power supply failure is detected, sends a power disconnect signal to the main power switch to control it to disconnect, and sends a power connection signal to the backup power switch to control it to connect. Controlling the main power switch to disconnect includes: first, turning off the second fully controlled switch; then, stopping the application of conduction signals to the first to Nth half-controlled switches and turning on the first fully controlled switch; the regulating winding automatically applies a reverse voltage to the first to Nth half-controlled switches to turn them off; and finally, turning off the first fully controlled switch. Controlling the backup power switch to turn on includes: turning on the first to Nth half-controlled switches by applying a conduction signal to them, and turning on the second full-controlled switch by applying a conduction signal to it.

[0028] It should be noted that, in order to easily distinguish between the main power switch and the backup power switch, the components in the main power switch and the components in the backup power switch are named separately. In the main power switch, the switching winding and the regulating winding are defined as the first switching winding and the first regulating winding, respectively, and the first full control switch and the second full control switch are defined as... , The first to Nth semi-controlled switches are respectively defined as ; In the backup power switch, the switching winding and the regulating winding are defined as the second switching winding and the second regulating winding, respectively, and the first full control switch and the second full control switch are defined as... , The first to Nth semi-controlled switches are respectively defined as .

[0029] In one embodiment, sending a power-on signal to the backup power switch requires two conditions to be met simultaneously: the main power supply is in a fault state and the main power switch is turned off. That is, the switching module is used to send a power-off signal to the main power switch when a main power supply fault is detected, and to send a power-on signal to the backup power switch after the main power supply has failed and the main power switch has been turned off.

[0030] In the above embodiments, the backup power switch is turned on only after the main power switch is turned off, thus avoiding the simultaneous connection of two power supplies and ensuring line safety. Moreover, the second power supply is only turned on when the main power supply is in a fault state and the main power switch is turned off, which can avoid malfunctions and ensure the reliability of switch switching.

[0031] like Figure 3 The diagram shows a schematic of a switching module according to an embodiment of the present invention. In one embodiment, the switching module includes a main power supply fault detection submodule, a main power supply disconnection signal generation submodule, and a backup power supply connection signal generation submodule. The main power supply fault detection submodule is used to detect whether the main power supply has failed and, when the main power supply fails, sends a main power supply fault signal to the main power supply disconnection signal generation submodule and the backup power supply connection signal generation submodule. The main power supply disconnection signal generation submodule is used to send a power disconnection signal to the main power switch after receiving the main power supply fault signal and to send a closing signal to the backup power supply connection signal generation submodule after the main power switch is disconnected. The backup power supply connection signal generation submodule is used to send a power connection signal to the backup power switch after receiving the main power supply fault signal and the closing signal.

[0032] In one embodiment, the main power supply fault detection submodule is used to detect whether a fault has occurred in the main power supply. Specifically, it detects whether the voltage sag of the backup power supply exceeds a set voltage sag threshold, i.e., determines whether a fault exists. If so, then the main power supply is determined to be faulty; where U 1sag U is the detected constant mains power supply voltage sag. th This is the set voltage sag threshold.

[0033] like Figure 4 The diagram shown is a structural schematic of a main power disconnection signal generation submodule according to an embodiment of the present invention. In one embodiment, the main power disconnection signal generation submodule includes a first signal generator and a second signal generator. The first signal generator is used to send a power disconnection signal to the main power switch after receiving a power fault signal, causing the main power switch to disconnect and thus disconnecting the main power supply line. The second signal generator is used to acquire the full control switch in the main power switch. The switch state and when the full control switch After the main power switch is turned off, a closing signal is sent to the backup power supply connection signal generation submodule.

[0034] like Figure 5 The diagram shows a schematic of the backup power supply signal generation submodule in one embodiment of the present invention. In one embodiment, the backup power supply signal generation submodule includes a first AND operator and a third signal generator. The first AND operator performs an AND operation on the main power supply fault signal and the closed signal and sends the AND operation result to the third signal generator, wherein the main power supply fault signal and the closed signal are both high level. The third signal generator sends a power supply signal to the backup power switch when the first AND operator outputs a high level, so that the backup power switch is turned on, thereby connecting the backup power supply line.

[0035] It should be noted that the first signal generator, the second signal generator, and the third signal generator can generate various types of electrical signals based on the input signal, including sine waves, square waves, and sawtooth waves. The generated signals are used to activate the module and the power electronic switching devices.

[0036] In one embodiment, a first isolating switch is connected between the main power switch and the main power supply, and a second isolating switch is connected between the standby power switch and the standby power supply. The first isolating switch is used to isolate the main power supply; the second isolating switch is used to isolate the standby power supply.

[0037] The following describes the process of the main power supply being disconnected by the power disconnection signal and the backup power supply being connected by the power connection signal.

[0038] like Figure 6 The diagram shown is a flowchart illustrating the action of controlling the main power switch to disconnect using a power disconnection signal according to an embodiment of the present invention. Specifically, controlling the main power switch to disconnect requires the following actions: S1, apply a turn-off signal to the full control switch Ts2 to turn off the full control switch Ts2. At this time, the first control winding is disconnected. S2, apply a turn-on signal to the fully controlled switch Ts1, turning on Ts1 and simultaneously stopping the bidirectional thyristors Th1~Th N The conduction signal is given, at which point the first control winding will send a signal to the bidirectional thyristors Th1~Th2. N Applying reverse pressure forces the bidirectional thyristors Th1~Th N Turn off; S3, apply a turn-off signal to the full control switch Ts1, causing the full control switch Ts1 to turn off, the main power switch input excitation reactor, and the main power transmission line to disconnect.

[0039] like Figure 7 The diagram shown is a flowchart illustrating the action of controlling the backup power switch to be turned on using a power-on signal according to an embodiment of the present invention. Specifically, controlling the backup power switch to be turned on requires the following actions: S1, to the bidirectional thyristor Th 1+N ~Th 2N Applying a conduction signal causes the bidirectional thyristor Th to... 1+N ~Th 2N When the circuit is turned on, the second switching winding module is closed and engaged, and a conduction signal is applied to the full control switch Ts4, causing the full control switch Ts4 to turn on, the second control winding to close and engage, the reactor input leakage reactance, and the backup power transmission line to close and engage to supply power to the load.

[0040] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. It should be noted that the terms "in one embodiment," "for example," and "again" are intended to illustrate the present invention and are not intended to limit the present invention.

[0041] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A power switch based on a reactor, characterized in that, include: A primary winding, located on the primary side of the reactor, has two ends that serve as the two ends of the power switch; A switching winding module includes first to Nth switching windings and first to Nth semi-controlled switches. Each switching winding is located on the secondary side of the reactor. The same-name terminal of the i-th switching winding is connected to the start terminal of the switching winding module through the i-th semi-controlled switch, i=1,2,...,N. In the first to Nth switching windings, the opposite-name terminal of the previous switching winding is connected to the same-name terminal of the next switching winding, and the opposite-name terminal of the Nth switching winding is connected to the start terminal of the switching winding module. Each semi-controlled switch can be directly turned on by applying a conduction signal and turned off when no conduction signal is applied and a reverse voltage is applied. The regulating winding module includes a first fully controlled switch, a second fully controlled switch, and a regulating winding. The regulating winding is located on the secondary side of the reactor. The first fully controlled switch is connected between the first end of the switching winding module and the opposite end of the regulating winding. The second fully controlled switch is connected between the same-name end and the opposite-name end of the regulating winding. The same-name end of the regulating winding is connected to the first end of the switching winding module.

2. The power switch based on a reactor as described in claim 1, characterized in that, The semi-controlled switch is a bidirectional thyristor.

3. The power switch based on a reactor as described in claim 1, characterized in that, Both the first and second full-control switches are insulated-gate bipolar transistors.

4. The power switch based on a reactor as described in claim 1, characterized in that, A capacitor is connected between the first fully controlled switch and the opposite-named terminal of the control winding.

5. The power switch based on a reactor as described in any one of claims 1 to 4, characterized in that, Also includes: A switch control module is used to disconnect the power supply when a power disconnection signal is received, and to connect the power supply when a power connection signal is received; The operation of disconnecting the power supply includes: first turning off the second full control switch, then stopping the application of conduction signals to the first to Nth half control switches and turning on the first full control switch, the control winding automatically applying reverse voltage to the first to Nth half control switches, the first to Nth half control switches being turned off when there is no conduction signal and a reverse voltage is applied, and finally turning off the first full control switch. The operation of connecting the power supply includes turning on the first to Nth half-control switches and the second full-control switch.

6. A power switching device based on a reactor, characterized in that, Includes main power switch, backup power switch and switching module; The main power switch is used to control the connection and disconnection between the main power supply and the load, and the backup power switch is used to control the connection and disconnection between the backup power supply and the load. Both the main power switch and the backup power switch are power switches as described in any one of claims 1 to 4. The switching module is used to detect the status of the main power supply and, when a fault is detected in the main power supply, to control the main power switch to send a power disconnect signal to control the main power switch to disconnect and to send a power on signal to the backup power switch to control the backup power switch to connect. Controlling the main power switch to disconnect includes: first turning off the second full control switch, then stopping the application of conduction signals to the first to Nth half control switches and turning on the first full control switch, wherein the regulating winding automatically applies reverse voltage to the first to Nth half control switches, the first to Nth half control switches are turned off when there is no conduction signal and a reverse voltage is applied, and finally turning off the first full control switch. Controlling the backup power switch to turn on includes: turning on the first to Nth half-control switches and the second full-control switch.

7. The power switching device based on a reactor as described in claim 6, characterized in that, The switching module is used to send a power disconnect signal to the main power switch when a main power failure is detected, and to send a power on signal to the backup power switch after the main power failure occurs and the main power switch is disconnected.

8. The power switching device based on a reactor as described in claim 7, characterized in that, The switching module includes: a main power failure detection submodule, a main power disconnection signal generation submodule, and a backup power connection signal generation submodule; The main power supply fault detection submodule is used to detect whether the main power supply has failed and to send a main power supply fault signal to the main power supply disconnection signal generation submodule and the backup power supply connection signal generation submodule when the main power supply fails. The main power disconnection signal generation submodule is used to send a power disconnection signal to the main power switch after receiving the main power fault signal, and to send a closing signal to the backup power connection signal generation submodule after the main power switch is disconnected. The backup power supply activation signal generation submodule is used to send a power supply activation signal to the backup power switch after receiving the main power supply fault signal and the closing signal.

9. The power switching device based on a reactor as described in claim 8, characterized in that, The main power disconnection signal generation submodule includes a first signal generator and a second signal generator; The first signal generator is used to send a power disconnect signal to the main power switch after receiving a power failure signal; The second signal generator is used to obtain the switching status of the first fully controlled switch in the main power switch and send a closing signal to the backup power supply connection signal generation submodule when it is turned off.

10. The power switching device based on a reactor as described in claim 8, characterized in that, The backup power supply signal generation submodule includes a first AND operator and a third signal generator; The first AND operator is used to perform an AND gate operation on the main power fault signal and the closed signal and send the AND gate operation result to the third signal generator, wherein the main power fault signal and the closed signal are both high level; The third signal generator is used to send a power-on signal to the backup power switch when the first AND operator outputs a high level.

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