WO2019109759A1

WO2019109759A1 - Portable inverter arc welding system and power control method thereof

Info

Publication number: WO2019109759A1
Application number: PCT/CN2018/112651
Authority: WO
Inventors: 佟天野
Original assignee: 苏州绿恺动力电子科技有限公司
Priority date: 2017-12-08
Filing date: 2018-10-30
Publication date: 2019-06-13
Also published as: CN107813031A

Abstract

A portable inverter arc welding system, comprising: a sequentially coupled rectifying filter circuit, a first voltage sampling circuit, and a first controllable switch; a sequentially coupled battery group, a second voltage sampling circuit, and a second controllable switch; a sequentially coupled electronic switching circuit, a transformer switching circuit, and an output rectifying circuit, wherein the input ends of the electronic switching circuit are respectively coupled to the first controllable switch and the second controllable switch; and a control unit, used to acquire the voltage signals collected by the first voltage sampling circuit and the second voltage sampling circuit, and to control the operating states of the first controllable switch, the second controllable switch, and the transformer switching circuit according to the acquired voltage signals. The system is simple in structure and low in cost. The invention also relates to a power control method using the system.

Description

Portable inverter arc welding system and power control method thereof

The present application claims priority to Chinese Patent Application No. 201711294104.8, entitled "Portable Inverter Arc Welding System and Its Power Supply Control Method", which is hereby incorporated by reference in its entirety. .

Technical field

The present application relates to the technical field of arc welding systems, and in particular to a portable inverter arc welding system and a power control method thereof.

Background technique

At present, high-power arc welding machines generally need to be connected to an AC power source, and in a place where there is no AC power supply, a fuel generator is generally required to cooperate. However, the fuel generator is bulky, heavy, and difficult to handle, and cannot meet the application conditions such as aerial work, underground pipeline maintenance, mine construction, emergency rescue, etc., and the fuel generator will bring air pollution, noise pollution, etc. during work. Environmental issues.

In response to the above problems, a portable arc welding machine powered by a lithium battery has appeared on the market, which has the advantages of being portable and non-polluting, and is suitable for emergency use in the field for a short time. However, in the course of implementing the present application, the inventors of the present application have found that in order to achieve power switching, such a portable arc welder requires two sets of electronic switching circuits. Therefore, the existing portable arc welding machine has a complicated structure and a high cost.

Summary of the invention

The purpose of the embodiments of the present application is to provide a portable inverter arc welding system and a power control method thereof to simplify the structure of the portable inverter arc welding system and reduce the cost thereof.

To achieve the above objective, in one aspect, the embodiment of the present application provides a portable inverter arc welding system, including:

a rectifying and filtering circuit, a first voltage sampling circuit and a first controllable switch coupled in sequence;

a battery pack coupled in sequence, a second voltage sampling circuit, and a second controllable switch;

An electronic switch circuit, a transformer switching circuit and an output rectifier circuit coupled in sequence; an input end of the electronic switch circuit is coupled to the first controllable switch and the second controllable switch, respectively;

a control unit, configured to acquire a voltage signal collected by the first voltage sampling circuit and the second voltage sampling circuit, and control the first controllable switch, the second controllable switch, and the The working state of the transformer switching circuit.

On the other hand, the embodiment of the present application further provides a power control method using the portable inverter arc welding system described above, including the following steps:

Obtaining a voltage signal collected by the first voltage sampling circuit and the second voltage sampling circuit;

Controlling an operating state of the first controllable switch, the second controllable switch, and the transformer switching circuit according to the voltage signal.

Preferably, the transformer switching circuit includes a third controllable switch and a transformer; a common end of the third controllable switch is connected to an output end of the electronic switch circuit, and a first selection of the third controllable switch An end is connected to a first primary winding of the transformer, a second selected end of the third controllable switch is connected to a second primary winding of the transformer, a first secondary winding and a second secondary winding of the transformer Connected to the input of the output rectifier circuit, respectively.

It can be seen from the technical solutions provided by the foregoing embodiments of the present application that, in the embodiment of the present application, the DC power supply provided by the external alternating current through the rectifying and filtering circuit shares the same electronic switching circuit as the DC power supply provided by the battery pack, instead of each prior to the prior art. A DC power supply sets up a separate electronic switching circuit. Therefore, compared with the prior art, the portable inverter arc welding system of the embodiment of the present application has a simpler structure and a lower cost.

DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings to be used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description are only It is a few embodiments described in the present application, and other drawings can be obtained from those skilled in the art without any inventive labor. In the drawing:

1 is a structural block diagram of a portable inverter arc welding system according to an embodiment of the present application;

2 is a circuit schematic diagram of a portable inverter arc welding system according to an embodiment of the present application;

3 is a circuit schematic diagram of a portable inverter arc welding system according to another embodiment of the present application;

4 is a flow chart of a power control method of a portable inverter arc welding system according to an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application are clearly and completely described in the following, in which the technical solutions in the embodiments of the present application are clearly and completely described. The embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without departing from the inventive scope shall fall within the scope of the application.

Referring to FIG. 1 , a portable inverter arc welding system according to an embodiment of the present application may include: a rectifying and filtering circuit, a first voltage sampling circuit, a first controllable switch, a battery pack, a second voltage sampling circuit, and a second controllable Switch, electronic switch circuit, transformer switching circuit, output rectifier circuit and control unit.

The rectifier filter circuit, the first voltage sampling circuit and the first controllable switch are sequentially connected. The battery pack, the second voltage sampling circuit and the second controllable switch are connected in sequence. The electronic switch circuit, the transformer switching circuit and the output rectifier circuit are sequentially connected, and the input ends of the electronic switch circuit are respectively connected to the first controllable switch and the second controllable switch. The two sampling signal input ends of the control unit are respectively connected to the sampling signal output end of the first voltage sampling circuit and the sampling signal output end of the second voltage sampling circuit. The three control signal output ends of the control unit respectively correspond to the control signal input end of the first controllable switch, the control signal input end of the second controllable switch, and the control signal input end of the transformer switching circuit. Connected. The control unit is configured to acquire a voltage signal collected by the first voltage sampling circuit and the second voltage sampling circuit, and control the first controllable switch and the second controllable switch according to the voltage signal And the working state of the transformer switching circuit.

It can be seen that in the portable inverter arc welding system of the embodiment of the present application, the DC power supplied by the external alternating current through the rectifying and filtering circuit shares an electronic switching circuit with the DC power supply provided by the battery pack, instead of the prior art. Each DC power supply is provided with a separate electronic switching circuit. Therefore, compared with the prior art, the portable inverter arc welding system of the embodiment of the present application has a simpler structure and a lower cost.

In an embodiment of the present application, the transformer switching circuit may include a third controllable switch and a transformer; a common end of the third controllable switch is connected to an output end of the electronic switch circuit, and the third controllable a first selected end of the switch is coupled to the first primary winding of the transformer, a second selected end of the third controllable switch is coupled to a second primary winding of the transformer, a first secondary winding of the transformer and A second secondary winding is coupled to the input of the output rectifier circuit, respectively.

In another embodiment of the present application, the transformer switching circuit may include a third controllable switch and a transformer; a first selection end of the third controllable switch is connected to a first secondary winding of the transformer, a second selected end of the third controllable switch is coupled to the second secondary winding of the transformer, the common end of the third controllable switch being coupled to the input of the output rectifier circuit, the first primary of the transformer A winding and a second primary winding are respectively connected to the output of the electronic switching circuit.

In the above embodiment of the present application, the first primary winding has the same number of turns as the second primary winding, and the first secondary winding has the same number of turns as the second secondary winding; The turns ratio of the first primary winding to the first secondary winding may be 10:4.

In the prior art, the DC power supply provided by the rectifying and filtering circuit and the DC power supply provided by the battery pack are respectively provided with separate electronic switching circuits, and the turns ratio of the primary and secondary windings of the transformer connected to the output end of each electronic switching circuit is It is fixed, so the prior art cannot simultaneously satisfy the use of different types of alternating current (such as AC110V, AC220V, etc.).

In the portable inverter arc welding system of the embodiment of the present application, the transformer is replaced with a transformer switching circuit (the structure of the transformer switching circuit and its relationship with other components have been clarified above) with respect to the prior art. And the control unit can control the working states of the first controllable switch, the second controllable switch, and the transformer switching circuit according to the voltage signals collected by the first voltage sampling circuit and the second voltage sampling circuit, and further implement The selection of the turns ratio of the transformer in the transformer switching circuit enables the portable inverter arc welding system of the embodiment of the present application to simultaneously satisfy the use of different types of alternating current. For example, when the AC 110V AC is externally connected, the turns ratio of the primary winding to the secondary winding can be selected to be 10:4; and when the AC 220V AC is externally connected, the turns ratio of the primary winding to the secondary winding can be selected as 20: 4. Therefore, the portable inverter arc welding system of the embodiment of the present application has a wider application range.

Referring to FIG. 4, in an embodiment of the present application, the control unit acquires a voltage signal collected by the first voltage sampling circuit and the second voltage sampling circuit, and controls the first according to the voltage signal. The working states of the controllable switch, the second controllable switch, and the transformer switching circuit may include the following steps:

S401. Acquire a voltage signal collected by the first voltage sampling circuit and the second voltage sampling circuit.

S402. Determine whether the voltage signal collected by the first voltage sampling circuit is within a first preset voltage range or is within a second preset voltage range. When the voltage signal collected by the first voltage sampling circuit is within the first preset voltage range, step S403a is performed. When the voltage signal collected by the first voltage sampling circuit is within the second preset voltage range, step S403b is performed. Step S404 is performed when the voltage signal collected by the first voltage sampling circuit is outside the second preset voltage range and the second preset voltage range.

S403. When the voltage signal collected by the first voltage sampling circuit is within a first preset voltage range, sequentially controlling the first selection end and the first controllable switch to be in a closed state. For example, when externally connected to 220V AC, the voltage after rectification and filtering is DC 310V, and the voltage collected by the first voltage sampling circuit in step S401 is DC310V, which belongs to the first preset voltage range. Therefore, the control unit can sequentially control the The first selection end and the first controllable switch are in a closed state. At this time, it is powered by 220V AC, and the turns ratio of the transformer is 20:4. When the load is no load, the output voltage of the output rectifier circuit is about DC62V, which meets the requirements of the arcing voltage of the welder. The controlling the first selection end and the first controllable switch in a closed state means: if the first selection end is currently in an off state, closing the first selection end; The first selection terminal is currently in the closed state, then maintains its closure; correspondingly, if the first controllable switch is currently in the off state, the first controllable switch is closed; if the first controllable switch It is now closed and remains closed.

S403b. When the voltage signal collected by the first voltage sampling circuit is within the second preset voltage range, sequentially controlling the second selection end and the first controllable switch to be in a closed state. For example, when externally accessing 110V AC power, the voltage after rectification and filtering is DC 155V, and the voltage collected by the first voltage sampling circuit in step S401 is DC155V, which is located in the second preset voltage range. Therefore, the control unit can sequentially control the The second selection terminal and the first controllable switch are in a closed state. At this time, it is powered by 110V AC, and the turns ratio of the transformer is 10:4. When the load is no load, the output voltage of the output rectifier circuit is about DC62V, which also meets the requirements of the arcing voltage of the welder.

S404. Determine whether the voltage signal collected by the first voltage sampling circuit is within the first preset voltage range or within the second preset voltage range. Step S405a is performed when the voltage signal collected by the second voltage sampling circuit is within the first predetermined voltage range. Step S405b is performed when the voltage signal collected by the second voltage sampling circuit is within the second predetermined voltage range. When the voltage signal collected by the second voltage sampling circuit is outside the second preset voltage range and the second preset voltage range, step S406 is performed.

S405a, when the voltage signal collected by the second voltage sampling circuit is located in the first preset voltage range, sequentially controlling the first selection end and the second controllable switch to be in a closed state.

S405b, when the voltage signal collected by the second voltage sampling circuit is located in the second preset voltage range, sequentially controlling the second selection end and the second controllable switch to be in a closed state.

S406. When the voltage signal collected by the second voltage sampling circuit is outside the first preset voltage range and the second preset voltage range, maintaining the first controllable switch and the second The current state of the control switch and the third controllable switch are unchanged.

It can be seen that the above power control method preferentially adopts an external AC power supply mode. When the range of the voltage that the external AC power does not access or access does not meet the requirements, the battery pack is used for power supply. Therefore, it is advantageous to improve the endurance of the portable inverter arc welding system of the embodiment of the present application.

In an embodiment of the present application, in normal operation, the control unit may adjust the switching duty ratio through a full bridge switching circuit to obtain an output external characteristic that satisfies the welding requirement.

In an embodiment of the present application, the voltage of the alternating current may be AC100V-130V or AC220-240V. The battery pack may be a lithium battery pack having a voltage of DC 155V ± 20% or DC 310V ± 20%. Correspondingly, the first preset voltage range may be DC 310V±20%; and the second preset voltage range may be DC155V±20%. The battery pack of the embodiment of the present application adopts DC155V, unlike the conventional technology, which uses DC48V because: in more cases, if DC48V is used, the transformer needs to adopt a step-up transformer to meet the welding requirements, thus increasing the current of the electronic switch circuit. The stress, which is easy to cause the components of the electronic switch circuit to be damaged due to severe heat, greatly shortens the service life. In another embodiment, the battery pack may be detachable to facilitate replacement and maintenance of the battery pack.

As shown in FIG. 2 or FIG. 3, in an embodiment of the present application, the rectifying and filtering circuit may include diodes D1, D2, D3, and D4 and a capacitor C1. The rectifying and filtering circuit integrates the input alternating current to form a smooth direct current. The voltage of the input alternating current is, for example, AC100V to 130V or AC220 to 240V.

As shown in FIG. 2 or FIG. 3, in an embodiment of the present application, the first voltage sampling circuit may include a resistor R1, a resistor R2, a capacitor C2, and a Zener diode Z1. The output of the rectifying and filtering circuit can be divided by the resistor R1 and the resistor R2, and then filtered by the capacitor C2 and input to a sampling signal input end of the control unit, and the sampling signal input terminal can be, for example, a control unit. Analog-to-Digital Convert (AD) acquisition port. The Zener diode Z1 can be used to limit the voltage of the resistor R1 and the resistor R2 to not exceed the maximum allowable voltage of the sampling signal input end of the control unit to prevent damage to the sampling signal input end.

As shown in FIG. 2 or FIG. 3, in an embodiment of the present application, the second voltage sampling circuit of the second voltage sampling circuit may include a resistor R3, a resistor R4, a capacitor C3, and a Zener diode Z2. The output of the battery pack can be divided by the resistor R3 and the resistor R4, and then filtered by the capacitor C3 and input to another sampling signal input end of the control unit (for example, the AD acquisition port of the control unit, etc.). Similarly, the Zener diode Z2 can be used to limit the voltage of the resistor R3 and the resistor R4 from being divided by the maximum allowable voltage of the sampling signal input terminal of the control unit to prevent damage to the sampling signal input terminal.

As shown in FIG. 2 or FIG. 3, in an embodiment of the present application, the first controllable switch K1 is controlled by the control unit and can be used to switch AC power as a power supply. The first controllable switch K1 can be, for example, a DC contactor, a DC relay or other controllable electronic switching device, such as a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET). Bipolar Junction Transistor (BJT), thyristor, Insulated Gate Bipolar Transistor (IGBT), etc.

As shown in FIG. 2 or FIG. 3, in an embodiment of the present application, the second controllable switch K2 is controlled by the control unit and can be used to switch the battery pack as a power supply. Similarly, the second controllable switch K2 can also be a DC contactor, a relay or other electronic switching device, such as an IGBT, a MOSFET, a BJT, a thyristor, etc., for switching the battery pack as a power supply.

In another embodiment of the present application, the first controllable switch K1 and the second controllable switch K2 may also be a set of conversion contacts of a single controllable switch, such as a DC contactor, a normally closed, normally open relay. Contacts, etc. As shown in FIG. 2 or FIG. 3, in an exemplary embodiment of the present application, the electronic switch circuit may be, for example, a full bridge switch circuit. The full bridge switch circuit may be composed of switch tubes Q1, Q2, Q3, and Q4, and the switch tube may be a single tube IGBT, a MOSFET, or an integrated IGBT module.

As shown in FIG. 2, in an exemplary embodiment of the present application, the transformer switching circuit may include a third controllable switch K3 and a transformer T1. The common end of the third controllable switch K3 is connected to the junction of the switch tubes Q2 and Q4 of the full bridge switch circuit, and the normally closed contact and the normally open contact of the third controllable switch K3 are respectively connected to the primary winding N1 of the transformer T1. At both ends, one end of the primary winding N2 of the transformer T1 is connected to the primary winding N1, and the other end is connected to the junction of the switching transistors Q1 and Q3. The secondary windings N3 and N4 of the transformer T1 are connected in series, the intermediate node is used as the negative terminal of the output terminal, and the other ends are connected to the output rectifier circuit. By switching the normally closed, normally open contacts of the third controllable switch K3, the number of turns of the primary winding of the transformer T1 can be varied. If K3 is connected to the A terminal, the primary winding of the transformer T1 in the loop is composed of N1 and N2 in series, and the number of turns is the sum of the two; if K3 is connected to the B terminal, the primary winding of the transformer T1 in the loop is composed of N2 alone. The number of turns is the number of turns of N2. In this way, the state of K3 can be switched according to the magnitude of the supply voltage, and the primary and secondary turns ratio of T1 can be changed, thereby enabling application of different power sources.

As shown in FIG. 3, in another embodiment of the present application, the transformer switching circuit may further be composed of a third controllable switch K3 and a transformer T1. The primary winding N1 of the transformer T1 is connected to the output of the full bridge switching circuit, and the secondary The windings N2 and N3 are connected in series, one end of the N2 is connected to the A end of the third controllable switch K3, and the intermediate node of the N2 and N3 is connected to the B end of the third controllable switch K3, the other end of the N3 and the third controllable switch K3 The common terminal is connected to the output rectifier circuit. This method is to adapt to different power supply by switching the number of turns of the secondary winding of the transformer T1. When K3 is connected to the A terminal, the secondary windings N2 and N3 are output in series, and the number of turns of the secondary winding is the sum of the two; K3 is connected to the B terminal, and the secondary winding N3 is output separately. This way also enables multiple power supplies.

In an exemplary embodiment of the present application, the third controllable switch K3 may be a DC contactor or a relay or the like having at least one set of normally closed, normally open contacts.

As shown in FIG. 2, in an embodiment of the present application, the rectified output circuit may include diodes D5 and D6. Diodes D5 and D6 can fully rectify the secondary winding output of transformer T1. The output of secondary winding N3 is connected to D5, the output of secondary winding N4 is connected to D6, and the cathodes of diodes D5 and D6 are connected together as output. pole.

As shown in FIG. 3, in another embodiment of the present application, the output rectifier circuit may further include a bridge rectifier circuit composed of diodes D7, D8, D9, and D10, and the input ends thereof are respectively connected to the third controllable switch K3. The common terminal and one end of the secondary winding N3, the cathodes of D7 and D8 are connected together as the positive terminal of the output terminal, and the anodes of D9 and D10 are connected together as the negative terminal of the output terminal.

In some embodiments, the control unit can be implemented by a hardware circuit composed of electronic components and logic elements (or logic circuits) or the like.

In another embodiment, in more cases, the control unit may be a processor. In some embodiments, the processor may be, for example, a Microcontroller Unit (MCU) (such as a single chip microcomputer), a Digital Signal Processing (DSP), and a Digital Signal Controller (Digital Signal Controller). , referred to as DSC), programmable logic device (Programmable Logic Device, PLD), ARM (Acorn RISC Machine) processor and other programmable integrated circuit modules.

For the convenience of description, the above devices are described separately by function into various units. Of course, the functions of each unit can be implemented in the same or multiple or hardware when implementing the present application.

It should also be noted that the terms "comprising," "comprising," or "comprising" or any other variants are intended to encompass a non-exclusive inclusion, such that a system, method, or device that includes a plurality of elements includes not only those elements but also Other elements that are explicitly listed, or include elements inherent to such systems, methods, or equipment. An element defined by the phrase "comprising a ..." does not exclude the presence of additional equivalent elements in the system, method, or device including the element, without further limitation.

The various embodiments in the specification are described in a progressive manner, and the same or similar parts between the various embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the method embodiment, since it is basically similar to the system embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the system embodiment.

The above description is only an embodiment of the present application and is not intended to limit the application. Various changes and modifications can be made to the present application by those skilled in the art. Any modifications, equivalents, improvements, etc. made within the spirit and scope of the present application are intended to be included within the scope of the appended claims.

Claims

A portable inverter arc welding system, comprising:

a rectifying and filtering circuit, a first voltage sampling circuit and a first controllable switch coupled in sequence;

a battery pack coupled in sequence, a second voltage sampling circuit, and a second controllable switch;

An electronic switch circuit, a transformer switching circuit and an output rectifier circuit coupled in sequence; an input end of the electronic switch circuit is coupled to the first controllable switch and the second controllable switch, respectively;

a control unit, configured to acquire a voltage signal collected by the first voltage sampling circuit and the second voltage sampling circuit, and control the first controllable switch, the second controllable switch, and the The working state of the transformer switching circuit.
The portable inverter arc welding system according to claim 1, wherein said transformer switching circuit comprises a third controllable switch and a transformer; a common end of said third controllable switch and said electronic switch circuit An output terminal is connected, a first selection end of the third controllable switch is connected to a first primary winding of the transformer, and a second selection end of the third controllable switch is connected to a second primary winding of the transformer, The first secondary winding and the second secondary winding of the transformer are each coupled to an input of the output rectifier circuit.
The portable inverter arc welding system of claim 1 wherein said transformer switching circuit comprises a third controllable switch and a transformer; said first selectable end of said third controllable switch and said transformer a first secondary winding connected, a second selected end of the third controllable switch being coupled to a second secondary winding of the transformer, a common end of the third controllable switch and an input of the output rectifier circuit Connected, the first primary winding of the transformer is coupled to the output of the electronic switching circuit.
A portable inverter arc welding system according to claim 2 or 3, wherein said controlling said first controllable switch, said second controllable switch and said transformer switching circuit in accordance with said voltage signal Working status, including:

When the voltage signal collected by the first voltage sampling circuit is within the first preset voltage range, the first selection end and the first controllable switch are sequentially controlled to be in a closed state.
A portable inverter arc welding system according to claim 2 or 3, wherein said controlling said first controllable switch, said second controllable switch and said transformer switching circuit in accordance with said voltage signal Working status, also includes:

When the voltage signal collected by the first voltage sampling circuit is within the second preset voltage range, the second selection end and the first controllable switch are sequentially controlled to be in a closed state.
A portable inverter arc welding system according to claim 2 or 3, wherein said controlling said first controllable switch, said second controllable switch and said transformer switching circuit in accordance with said voltage signal Working status, also includes:

When the voltage signal collected by the first voltage sampling circuit is outside the first preset voltage range and the second preset voltage range, and the voltage signal collected by the second voltage sampling circuit is located in the first preset voltage range The first selection end and the second controllable switch are sequentially controlled to be in a closed state.
A portable inverter arc welding system according to claim 2 or 3, wherein said controlling said first controllable switch, said second controllable switch and said transformer switching circuit in accordance with said voltage signal Working status, also includes:

When the voltage signal collected by the first voltage sampling circuit is outside the first preset voltage range and the second preset voltage range, and the voltage signal collected by the second voltage sampling circuit is located in the second preset voltage range The second selection end and the second controllable switch are sequentially controlled to be in a closed state.
A portable inverter arc welding system according to claim 2 or 3, wherein said controlling said first controllable switch, said second controllable switch and said transformer switching circuit in accordance with said voltage signal Working status, also includes:

When the voltage signal collected by the first voltage sampling circuit is outside the first preset voltage range and the second preset voltage range, and the voltage signal collected by the second voltage sampling circuit is located in the first preset voltage range And maintaining the current state of the first controllable switch, the second controllable switch, and the third controllable switch unchanged while outside the second preset voltage range.
A portable inverter arc welding system according to claim 2 or 3, wherein said electronic switching circuit comprises a full bridge switching circuit.
A power control method using the portable inverter arc welding system of claim 1, comprising the steps of:

Obtaining a voltage signal collected by the first voltage sampling circuit and the second voltage sampling circuit;

Controlling an operating state of the first controllable switch, the second controllable switch, and the transformer switching circuit according to the voltage signal.
The power supply control method according to claim 10, wherein said transformer switching circuit comprises a third controllable switch and a transformer; and a common end of said third controllable switch is connected to an output of said electronic switch circuit a first selectable end of the third controllable switch is coupled to a first primary winding of the transformer, and a second selected end of the third controllable switch is coupled to a second primary winding of the transformer, the transformer The first secondary winding and the second secondary winding are respectively connected to the input of the output rectifier circuit.
The power supply control method according to claim 10, wherein said transformer switching circuit comprises a third controllable switch and a transformer; said first selection end of said third controllable switch and said first time of said transformer a stage winding is connected, a second selection end of the third controllable switch is connected to a second secondary winding of the transformer, and a common end of the third controllable switch is connected to an input end of the output rectifier circuit The first primary winding and the second primary winding of the transformer are respectively connected to the output of the electronic switching circuit.
The power supply control method according to claim 11 or 12, wherein the operating state of the first controllable switch, the second controllable switch, and the transformer switching circuit is controlled according to the voltage signal, include:

When the voltage signal collected by the first voltage sampling circuit is within the first preset voltage range, the first selection end and the first controllable switch are sequentially controlled to be in a closed state.
The power supply control method according to claim 11 or 12, wherein the operating state of the first controllable switch, the second controllable switch, and the transformer switching circuit is controlled according to the voltage signal, Also includes:

When the voltage signal collected by the first voltage sampling circuit is within the second preset voltage range, the second selection end and the first controllable switch are sequentially controlled to be in a closed state.
The power supply control method according to claim 11 or 12, wherein the operating state of the first controllable switch, the second controllable switch, and the transformer switching circuit is controlled according to the voltage signal, Also includes:

When the voltage signal collected by the first voltage sampling circuit is outside the first preset voltage range and the second preset voltage range, and the voltage signal collected by the second voltage sampling circuit is located in the first preset voltage range The first selection end and the second controllable switch are sequentially controlled to be in a closed state.
The power supply control method according to claim 11 or 12, wherein the operating state of the first controllable switch, the second controllable switch, and the transformer switching circuit is controlled according to the voltage signal, Also includes:

When the voltage signal collected by the first voltage sampling circuit is outside the first preset voltage range and the second preset voltage range, and the voltage signal collected by the second voltage sampling circuit is located in the second preset voltage range The second selection end and the second controllable switch are sequentially controlled to be in a closed state.
The power supply control method according to claim 11 or 12, wherein the operating state of the first controllable switch, the second controllable switch, and the transformer switching circuit is controlled according to the voltage signal, Also includes:

When the voltage signal collected by the first voltage sampling circuit is outside the first preset voltage range and the second preset voltage range, and the voltage signal collected by the second voltage sampling circuit is located in the first preset voltage range And maintaining the current state of the first controllable switch, the second controllable switch, and the third controllable switch unchanged while outside the second preset voltage range.