Welding machine and welding machine starting circuit

Abstract

The utility model relates to the technical field of automation, in particular to a welding machine and a welding machine starting circuit. The welding machine is provided with a control panel, and the welding machine starting circuit comprises a switch module used for controlling on-off of the welding machine; the alternating current power supply module is connected with the switch module and controls the switch module to be switched on or switched off; the direct current power supply module is connected with the control end of the switch module, the direct current power supply module comprises a panel key, the panel key is installed on a control panel, and the direct current power supply module controls the switch module to be switched on under the condition that the panel key is triggered; and the power-off module is connected with the control end of the switch module and controls the switch module to be switched off under the condition that the power-off signal is received. The direct current power supply module is additionally arranged in the welding machine starting circuit of the welding machine, so that the welding machine can be normally started in an alternating current mode and a direct current mode, and the application scenes of the welding machine are increased.

Description

Technical Field

[0001] The present application relates to the field of automation technology, and in particular to a welding machine and a welding machine starting circuit. Background Art

[0002] A welder is an electrical appliance that provides a power source with certain characteristics for welding. Based on electromagnetic induction and thermal effects, the welder converts electrical energy into heat energy, thereby achieving the welding of metal materials.

[0003] In recent years, continuous innovation in welding power supply technology has led to increasingly diverse and flexible power supply methods for welding machines. In related technologies, welding machines are often powered by AC power, but this limits their application scenarios. To ensure excellent performance in various power environments, a welding machine that can operate in both AC and DC modes is needed. Utility Model Content

[0004] Based on this, it is necessary to provide a welding machine and a welding machine starting circuit that can be applied in a variety of scenarios.

[0005] In one aspect, a welding machine starting circuit is provided, wherein the welding machine has a control panel, and the welding machine starting circuit comprises:

[0006] Switch module, used to control the welding machine on and off;

[0007] an AC power supply module, connected to the switch module and controlling the switch module to be turned on or off;

[0008] a DC power supply module connected to the control end of the switch module, the DC power supply module including a panel button of the control panel, the panel button being installed on the control panel, and the DC power supply module controlling the switch module to be turned on when the panel button is triggered;

[0009] The shutdown module is connected to the control end of the switch module, and controls the switch module to be disconnected when a shutdown signal is received.

[0010] In one embodiment, the DC power supply module includes:

[0011] A connecting circuit, the AC power supply module and the DC power supply module share the connecting circuit;

[0012] The battery unit includes a battery. When the panel button is triggered, the battery provides a starting voltage to the switch module via the connecting circuit.

[0013] In one embodiment, the battery unit further includes a control chip, which is connected to the battery. When the panel button is triggered, the control chip controls the battery to provide a starting voltage to the switch module via the connection circuit.

[0014] In one embodiment, the battery unit further includes a protection diode, wherein the positive electrode of the protection diode is connected to the battery, and the negative electrode of the protection diode is connected to the connection circuit.

[0015] In one embodiment, the connection circuit includes a photocoupler, the photocoupler includes a light emitting diode and a photodetector, the battery is connected to the light emitting diode, one end of the photodetector is connected to the control end of the switch module, and the other end of the photodetector is grounded.

[0016] In one embodiment, the AC power supply module includes a transformer, a first transformer unit and a second transformer unit, the primary winding of the transformer is used to connect to AC power, the secondary winding of the transformer is connected to the first transformer unit and the second transformer unit, the first transformer unit is connected to the input end and the control end of the switch module, the second transformer unit is connected to the control end of the switch module, and the second transformer unit includes the connection circuit.

[0017] In one embodiment, the second transformer unit includes a rectifier bridge, the first input end and the second input end of the rectifier bridge are respectively connected to the secondary winding of the transformer, the first output end and the second output end of the rectifier bridge are connected to the connection circuit, one end of the panel button is connected to the first output end of the rectifier bridge, and the other end of the panel button is connected to the light-emitting diode.

[0018] In one embodiment, the second voltage transformation unit includes a polar capacitor, one end of the polar capacitor is connected to the first output end of the rectifier bridge, and the other end of the polar capacitor is connected to the second output end of the rectifier bridge.

[0019] In one embodiment, the second voltage transformation unit includes a non-polarized capacitor, one end of the non-polarized capacitor is connected to the first output end of the rectifier bridge, and the other end of the non-polarized capacitor is connected to the second output end of the rectifier bridge.

[0020] In one aspect, a welding machine is provided, comprising:

[0021] control Panel;

[0022] A welding machine starting circuit is provided according to any one of the aforementioned embodiments.

[0023] The aforementioned welding machine and welding machine starting circuit incorporate a DC power supply module into the welding machine's starting circuit, enabling the machine to start normally in both AC and DC modes, thereby expanding the welding machine's application scenarios. Furthermore, the welding machine includes a control panel, which improves safety compared to traditional methods such as using a rotary switch. Furthermore, when powered by DC, there is no external voltage impact, ensuring that the welding machine of this application complies with safety regulations. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic diagram of a welding machine starting circuit provided by an embodiment;

[0026] Figure 2 A schematic diagram of a welding machine starting circuit provided by another embodiment;

[0027] Figure 3 A schematic diagram of a welding machine starting circuit provided in yet another embodiment.

[0028] Description of the accompanying drawings: welding machine starting circuit-100; switch module-110; AC power supply module-120; DC power supply module-130; shutdown module-140. DETAILED DESCRIPTION

[0029] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0031] It will be understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor without departing from the scope of this application. The first resistor and the second resistor are both resistors, but they are not the same resistor.

[0032] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if there is transmission of electrical signals or data between the connected circuits, modules, units, etc.

[0033] It is understood that “at least one” refers to one or more, “a plurality” refers to two or more, and “at least a portion of an element” refers to a portion or all of an element.

[0034] As used herein, the singular forms "a," "an," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include," "comprising," "having," and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Furthermore, the term "and / or" as used in this specification includes any and all combinations of the relevant listed items.

[0035] In one or more embodiments and combinations thereof of the present application, a welding machine is provided, comprising a control panel and a welding machine starting circuit 100. The control panel has push-button functions. A user can start and stop the welding machine via the control panel. Furthermore, the control panel can provide direct current (DC) power to the welding machine, and the welding machine body has an alternating current (AC) interface. The welding machine starting circuit 100 can be as shown in the welding machine starting circuit 100 provided in one or more embodiments and combinations thereof of the present application. Therefore, the welding machine provided in the present application can have both DC starting and AC starting functions.

[0036] In one embodiment, see Figure 1 、 Figure 2 and Figure 3 The welding machine starting circuit 100 includes a switch module 110 , an AC power supply module 120 , a DC power supply module 130 and a shutdown module 140 .

[0037] The switch module 110 can be used to control the welding machine to turn on and off. As an example, the switch module 110 can have an input end, an output end, and a control end. In this case, the output end of the switch module 110 can be connected to a relay of the welding machine, or a control chip of the welding machine. For details, please refer to Figure 2 The switch module 110 may be a transistor Q1, the output end of the transistor Q1 may be terminal C, the input end of the transistor Q1 may be terminal E, and the control end of the transistor Q1 may be terminal B. The output end (terminal C) of the transistor Q1 may be connected to a relay of the welding machine or a control chip CN1 of the welding machine.

[0038] One end of the AC power supply module 120 can be connected to the control end of the switch module 110 (for example, the control end of the switch module 110 can be the base of the transistor Q1), thereby controlling the switch module 110 to be turned on or off, and the other end can be connected to the AC power. In addition, the AC power supply module 120 may include an AC-DC conversion unit, a voltage change unit, etc. As an example, see Figure 2 The AC power supply module 120 can be connected to a 240V AC power supply.

[0039] See also Figure 3 One end of the DC power supply module 130 can be connected to the control end of the switch module 110, and the other end can be connected to the DC power. In addition, the DC power supply module 130 can also include a panel button, which can be installed on the control panel. Further, when the panel button is triggered, the DC power supply module 130 can control the switch module 110 to conduct. As an example, please refer to Figure 2 , the panel button can be button SW1.

[0040] The shutdown module 140 can be connected to the control terminal of the switch module 110 at one end and receive a shutdown signal at the other end. Upon receiving the shutdown signal, the shutdown module 140 controls the switch module 110 to disconnect, thereby stopping the welder. For example, the shutdown module 140 can include a control chip CN2, which can be used in a terminal product. When the welder needs to be stopped, a shutdown signal can be remotely sent to the control chip CN2.

[0041] In this embodiment, by adding a DC power supply module 130 to the welder's starting circuit 100, the welder can be started normally in both AC and DC modes, thereby expanding the welder's application scenarios. Furthermore, in this embodiment, the welder includes a control panel. Compared to traditional methods such as using a rotary switch, using the control panel to start the welder improves safety. Furthermore, in this embodiment, when using DC power, there is no external voltage impact, ensuring that the welder of this application meets safety regulations.

[0042] See also Figure 2 and Figure 3 The following is an exemplary description of the composition of the DC power supply module 130. It should be understood that the following description is only for illustrative purposes, and the present application is not limited to the circuits provided in the following description.

[0043] The DC power supply module 130 may include a connection circuit and a battery unit. The AC power supply module 120 and the DC power supply module 130 may share this connection circuit. For example, the connection circuit may include at least a photocoupler. The photocoupler includes a light-emitting diode (LED) and a photodetector. The battery is connected to the LED. One end of the photodetector is connected to the control terminal of the switch module, and the other end of the photodetector is grounded. For example, the connection circuit may include at least a photocoupler U3. The photocoupler U3 may have a first end (terminal A), a second end (terminal K), a third end (terminal C), and a fourth end (terminal E). The LED of the photocoupler U3 may be connected to the first and second ends. The photodetector of the photocoupler U3 is connected to the third and fourth ends. The first or second end of the photocoupler U3 may be connected to the battery unit. For example, the positive input end of the LED of the photocoupler U3 may be connected to the positive terminal of the battery. The third end of the photocoupler U3 may be connected to the control terminal of the transistor Q1, and the fourth end of the photocoupler U3 may be grounded. Furthermore, the connection circuit may include resistors R5, R9, and R10. Resistors R5 and R9 can be connected in series, with resistor R5 also being connected to the control terminal of transistor Q1, and resistor R9 being connected to the third terminal of photocoupler U3. One end of resistor R10 can be connected to the first terminal of photocoupler U3, and the other end of resistor R10 can be connected to the battery cell.

[0044] The battery unit may include a battery. When the panel button is triggered, the battery may output a starting voltage to the switch module 110 via the connection circuit. As an example, the battery may provide a starting voltage of 5V. In addition, the battery unit may further include a control chip. As an example, the control chip may be a control chip CN3. The control chip CN3 may have a first pin, a second pin, and a third pin. The first pin of the control chip CN3 may be connected to the first end of the photocoupler U3, the second pin of the control chip CN3 may be left floating, and the third pin of the control chip CN3 may be connected to the second end of the photocoupler U3. In addition, a detection device may be provided at the first end of the photocoupler U3, which may be used to detect whether the button SW1 is triggered. When it is detected that the button SW1 is triggered, the detection device may send a signal to the control chip CN3. After the third pin of the control chip CN3 detects the high and low levels, it may transmit an electrical signal to the subsequent chip. The subsequent chip may control the battery power supply. At this time, the AC power supply module 120 has no voltage. After passing through resistor R10, the first terminal of photocoupler U3 can have a voltage. At this point, the light-emitting diode of photocoupler U3 receives the electrical signal and converts it into an optical signal. The photodetector of photocoupler U3 then converts the optical signal into an electrical signal and outputs it. The current output from the photodetector of photocoupler U3 passes through resistors R9 and R5, and can apply voltage to the control terminal of transistor Q1, thereby starting the welder.

[0045] In addition, the battery unit further includes a protection diode D2 , the anode of which is connected to the output terminal of the battery, and the cathode of which is connected to the aforementioned connection circuit, thereby preventing current backflow.

[0046] The AC power supply module 120 may include a transformer T1, a first transformer unit, and a second transformer unit. The transformer may be a 240 / 36V power frequency transformer capable of operating at 120 / 240VAC, thereby providing power to the welding machine's relay. Transformer T1 includes a primary winding and a secondary winding. The primary winding of transformer T1 is used to receive AC power. The primary winding of transformer T1 may also be connected to a capacitor CX1, which filters out unwanted current. The secondary winding of transformer T1 is connected to the first transformer unit and the second transformer unit. As an example, the first and second ends of the secondary winding of transformer T1 are connected to the second transformer unit, and the third and fourth ends of the secondary winding of transformer T1 are connected to the first transformer unit. The first transformer unit is connected to the input and control terminals of the switch module 110, and the second transformer unit is connected to the control terminal of the switch module 110. For example, the first transformer unit is connected to the base and emitter of transistor Q1, and the second transformer unit is connected to the base of transistor Q1.

[0047] The second voltage conversion unit may include the aforementioned connection circuit. It will be appreciated that when the welder is started in DC mode, the battery can be connected to the control terminal of the switch module 110 via the connection circuit. When the welder is started in AC mode, the battery can also be connected to the control terminal of the switch module 110 via the connection circuit. Furthermore, the second voltage conversion unit may further include a rectifier bridge, a polarized capacitor, and a non-polarized capacitor. The rectifier bridge may be rectifier bridge BD2, wherein the first and second input terminals of rectifier bridge BD2 are respectively connected to the secondary winding of transformer T1, and the first and second output terminals of rectifier bridge BD2 are connected to the aforementioned connection circuit. One end of button SW1 is connected to the first output terminal of rectifier bridge BD2, and the other end of button SW1 can be connected to the second end of optocoupler U3. The polarized capacitor may be polarized capacitor C7, wherein one end of polarized capacitor C7 is connected to the first output terminal of rectifier bridge BD2, and the other end of polarized capacitor C7 can be connected to the second output terminal of rectifier bridge BD2, or the other end of polarized capacitor C7 can be grounded. The non-polarized capacitor may be a non-polarized capacitor C8 , one end of which is connected to the resistor R10 , and the other end of which is connected to the second end of the photocoupler U3 (the negative input end of the light emitting diode).

[0048] The second transformer unit can convert AC power into DC power by setting up a rectifier bridge BD2. Afterwards, the second transformer unit filters out unnecessary current by setting up a polarized capacitor C7 and a non-polarized capacitor C8, so that the photoelectric coupler U3 can operate normally. Furthermore, the present application can set one end of the button SW1 to be connected to the first output end of the rectifier bridge BD2, and the other end of the button SW1 can be connected to the second end of the photoelectric coupler U3, thereby preventing current from flowing to the control chip CN3 when the welding machine is started in AC mode. Moreover, when the button SW1 is triggered, the button SW1 can be disconnected, thereby automatically cutting off the input of the second transformer unit.

[0049] The first voltage conversion unit may include electronic components such as a rectifier bridge BD1 and a polarized capacitor C4. The first and second input terminals of the rectifier bridge BD1 can be connected to the secondary winding, and the first and second output terminals of the rectifier bridge BD1 can be connected to the two ends of the polarized capacitor C4. Polarized capacitor C4 can also be connected in parallel with a non-polarized capacitor C5 to filter and stabilize the DC power converted by the rectifier bridge BD1, outputting a more stable DC power. One end of the non-polarized capacitor C5 can also be connected to a step-down chip U1. Step-down chip U1 may include a step-down controller. Step-down chip U1 may be equipped with a built-in switching transistor and a comparator to reduce the voltage of the DC power converted by the rectifier bridge BD1. Step-down chip U1 may include an input voltage pin Vin, an output voltage pin Vout, a feedback control pin FB, a ground pin G, and a non-connection pin NC. The input voltage pin Vin of step-down chip U1 is connected to one end of the non-polarized capacitor C5 to receive the higher-voltage DC power after rectification and filtering. The output voltage pin Vout of the buck chip U1 can be connected to one end of the inductor L1. The output voltage pin Vout can output a voltage of 13.5V or 13.6V. The feedback control pin FB of the buck chip U1 is connected to resistor R7 to collect the output voltage signal from the output voltage pin Vout. The comparator built into the buck chip U1 compares the signal with a set reference value. Based on the comparison result, the switching frequency of the switching element within the buck chip U1 is adjusted to provide feedback regulation of the output voltage, outputting the desired stable low voltage. The ground pin G of the buck chip U1 can be connected to the open pin NC and then grounded.

[0050] In addition, the first transformer unit may further include a protection diode D1, the positive electrode of which is connected to the output voltage pin Vout, and the negative electrode of which may be grounded. One end of the inductor L1 is connected to the output voltage pin Vout, and the other end of the inductor L1 may be connected to the input of the transistor Q1. The protection diode D1 and the inductor L1 may jointly perform the functions of voltage reduction and energy storage, allowing the current to change more smoothly and avoiding the occurrence of surge voltage. The first transformer unit may further include a resistor R2, a resistor R3, and a resistor R7 arranged in series. Resistors R2, R3, and R7 may be used for voltage division. The other end of resistor R2 may also be connected to the input of the transistor Q1, and the other end of resistor R7 may also be connected to the negative electrode of the protection diode D1. Furthermore, the feedback control pin FB of the step-down chip U1 may be connected between resistors R3 and R7. In this case, resistor R7 may serve as a sampling resistor to collect the output voltage signal of the output terminal. The first voltage conversion unit may further include a polarized capacitor C2 and a non-polarized capacitor C3 connected in parallel, one end of each of which may be connected to a resistor R2 and the other end to a resistor R7. After filtering and voltage stabilization by the polarized capacitor C2 and the non-polarized capacitor C3, a relatively stable low voltage can be obtained, thereby protecting the transistor Q1. Furthermore, a resistor R1 may be provided between the input and control terminals of the transistor Q1 to further protect the transistor Q1.

[0051] The shutdown module 140 may include electronic components such as a control chip CN2 and a photocoupler U2. The control chip CN2 includes a first pin, a second pin, and a third pin. The first pin of the control chip CN2 is connected to a constant voltage power supply. The second pin of the control chip CN2 can be connected to one end of a resistor R12. The third pin of the control chip CN2 can be grounded. A resistor R6 can be provided between the first pin of the control chip CN2 and the A end of the photocoupler U2. The other end of the resistor R12 can be connected to the base of the transistor Q3, the collector of the transistor Q3 can be connected to the K end of the photocoupler U2, and the emitter of the transistor Q3 can be grounded. A resistor R12 can be provided between the base of the transistor Q3 and the resistor R12. The C end of the photocoupler U2 can be connected to a resistor R8 and a resistor R3 respectively, and the E end of the photocoupler U2 can be grounded. The other end of resistor R8 can be connected to the base of transistor Q2, the emitter of transistor Q2 can be grounded, and the collector of transistor Q2 can be connected to the base of transistor Q1 via resistor R5. Furthermore, one end of resistor R11 can be connected to resistor R8, and the other end can be grounded. One end of non-polarized capacitor C6 can be connected to resistor R8, and the other end can be grounded.

[0052] For example, it can be set that after the panel is long pressed for 3 seconds, the control chip CN2 receives a shutdown signal, and the second pin of the control chip CN2 can emit a high level. At this time, the base of the transistor Q3 receives a current signal, and the transistor Q3 is turned on, so that the circuit where the light-emitting diode of the photoelectric coupler U2 is located is turned on, and the light-emitting diode of the photoelectric coupler U2 emits light. The photodetector of the photoelectric coupler U2 receives the light signal and turns on, and by controlling the transistor Q2, the voltage at the control end of the transistor Q1 is pulled down. The transistor Q2 is cut off, which can cause the transistor Q1 to be cut off as well, and the relay of the welding machine is disconnected. For another example, after the panel is long pressed for 3 seconds, the control chip CN2 receives a shutdown signal, and the control chip CN2 can control the battery to stop supplying power. In this application, by setting the photoelectric coupler U2 and the photoelectric coupler U3, double isolation is achieved, product reliability is improved, and safety regulations are met.

[0053] Furthermore, when using DC power supply mode, pressing the power button on panel SW1 directly generates a 5V DC power supply directly from the battery, forming a current loop through device protection diode D2, resistor R10, and optocoupler U3. Terminal A of optocoupler U3 provides a power-on signal, turning on transistor Q2 in the back-end circuit. For example, in AC+DC mode, transistor Q2 can be a self-latching transistor. The collector of transistor Q2 is at a low level. When transistor Q1 is turned on, current flows through the output terminal of transistor Q1 and is output to the base of transistor Q2, turning on transistor Q2. After the transistor Q2 is turned on, the collector of the transistor Q2 is electrically connected to the control terminal of the transistor Q1, and the current is outputted back to the transistor Q1 in the reverse direction, providing the control terminal current for the transistor Q1 to be continuously turned on, thereby realizing the continuous conduction of the transistor Q1. Therefore, when the button SW1 is triggered, the circuit can automatically maintain a continuous power-on state until it is disconnected by pressing another button or receiving other shutdown signals, thereby ensuring stable power supply for the welding machine.

[0054] In addition, the welding machine starting circuit 100 may further include a polar capacitor C1 , one end of which is connected to the first pin of the control chip CN1 , and the other end of which is connected to the second pin of the control chip CN1 , thereby filtering the control chip CN1 .

[0055] It is understandable that the welding machine starting circuit 100 may also adopt other forms, and is not limited to the forms mentioned in the above embodiment, as long as it can achieve the function of the welding machine starting circuit 100.

[0056] In the description of this specification, reference to the terms "some embodiments" or "other embodiments" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0057] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0058] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A welding machine starting circuit, characterized in that: The welding machine has a control panel, and the welding machine starting circuit includes: Switch module, used to control the welding machine on and off; an AC power supply module, connected to the switch module and controlling the switch module to be turned on or off; a DC power supply module connected to the control end of the switch module, the DC power supply module including a panel button of the control panel, the panel button being installed on the control panel, and the DC power supply module controlling the switch module to be turned on when the panel button is triggered; The shutdown module is connected to the control end of the switch module, and controls the switch module to be disconnected when a shutdown signal is received.

2. The welding machine starting circuit according to claim 1, characterized in that: The DC power supply module includes: A connecting circuit, the AC power supply module and the DC power supply module share the connecting circuit; The battery unit includes a battery. When the panel button is triggered, the battery provides a starting voltage to the switch module via the connecting circuit.

3. The welding machine starting circuit according to claim 2, characterized in that: The battery unit further includes a control chip, which is connected to the battery. When the panel button is triggered, the control chip controls the battery to provide a starting voltage to the switch module via the connection circuit.

4. The welding machine starting circuit according to claim 2, characterized in that: The battery unit further includes a protection diode, wherein the positive electrode of the protection diode is connected to the battery, and the negative electrode of the protection diode is connected to the connection circuit.

5. The welding machine starting circuit according to claim 2, characterized in that: The connection circuit includes a photoelectric coupler, which includes a light emitting diode and a photodetector. The battery is connected to the light emitting diode. One end of the photodetector is connected to the control end of the switch module, and the other end of the photodetector is grounded.

6. The welding machine starting circuit according to claim 5, characterized in that: The AC power supply module includes a transformer, a first transformer unit and a second transformer unit. The primary winding of the transformer is used to access AC power. The secondary winding of the transformer is connected to the first transformer unit and the second transformer unit. The first transformer unit is connected to the input end and the control end of the switch module. The second transformer unit is connected to the control end of the switch module. The second transformer unit includes the connection circuit.

7. The welding machine starting circuit according to claim 6, characterized in that: The second transformer unit includes a rectifier bridge, the first input end and the second input end of the rectifier bridge are respectively connected to the secondary winding of the transformer, the first output end and the second output end of the rectifier bridge are connected to the connection circuit, one end of the panel button is connected to the first output end of the rectifier bridge, and the other end of the panel button is connected to the light-emitting diode.

8. The welding machine starting circuit according to claim 7, characterized in that: The second voltage transformation unit includes a polar capacitor, one end of the polar capacitor is connected to the first output end of the rectifier bridge, and the other end of the polar capacitor is connected to the second output end of the rectifier bridge.

9. The welding machine starting circuit according to claim 7, characterized in that: The second voltage transformation unit includes a non-polarized capacitor, one end of the non-polarized capacitor is connected to the first output end of the rectifier bridge, and the other end of the non-polarized capacitor is connected to the second output end of the rectifier bridge.

10. A welding machine, characterized in that: include: control Panel; The welding machine starting circuit according to any one of claims 1 to 9.

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