Electric welding machine power supply circuit and power supply method

Abstract

The invention provides an electric welding machine power supply circuit and a power supply method. The electric welding machine power supply circuit comprises a transformer, a first power supply loop, a second power supply loop and a control circuit, wherein the primary side of the transformer is connected to the first power supply loop, and the secondary side of the transformer is connected with the load; the first power supply loop is powered by a power supply grid; the control circuit is connected to the first power supply loop and used for controlling the output state of the first power supply loop. The second power supply loop is powered by the battery and is connected to the secondary side of the transformer in parallel; the control circuit is further connected to the second power supply loop and used for controlling the output state of the second power supply loop. The electric welding machine power supply circuit can provide various different power supply modes, the electric welding machine is allowed to flexibly select power supply modes according to actual working requirements, and the flexibility and adaptability of the electric welding machine are improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric welding machines, and in particular to a power supply circuit and a power supply method for electric welding machines. Background Art

[0002] An electric welder is a device that uses the high-temperature arc generated when the positive and negative poles are short-circuited for an instant to melt the solder on the welding rod and the material to be welded, thereby combining the objects to be contacted.

[0003] The welding process of electric welders has extremely high requirements for the stability and reliability of the power supply. However, the traditional power supply of electric welders depends on the power grid. In areas where the power grid is unstable or cannot be covered, welding operations are difficult to carry out, and it is easy to cause the power grid to trip when the electric welder is in use. It can be seen that there are limitations.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Summary of the invention

[0005] Based on this, the embodiments of the present application provide a power supply circuit and a power supply method for a welding machine, which can provide a variety of different power supply modes, allowing the welding machine to flexibly select the power supply mode according to actual work needs, thereby improving the flexibility and adaptability of the welding machine.

[0006] According to some embodiments, the present application provides a welding machine power supply circuit, including: a transformer, a first power supply circuit, a second power supply circuit and a control circuit; wherein,

[0007] The primary side of the transformer is connected to the first power supply circuit, and the secondary side of the transformer is connected to the load;

[0008] The first power supply circuit is powered by a power supply grid; the control circuit is connected to the first power supply circuit to control the output state of the first power supply circuit;

[0009] The second power supply circuit is powered by a battery and is connected in parallel to the secondary side of the transformer; the control circuit is also connected to the second power supply circuit to control the output state of the second power supply circuit.

[0010] The welding machine power supply circuit provided by the present application comprises a first power supply circuit provided by a power supply grid, and a second power supply circuit provided by a battery, and the second power supply circuit is connected in parallel to the secondary side of the transformer, thereby providing a plurality of different power supply modes for the welding machine. By controlling the output states of the first power supply circuit and the second power supply circuit through a control circuit, it is possible to achieve flexible switching of the power supply mode, and the steps are simple and easy to implement. By adopting the power supply circuit provided by the present application, the welding machine can choose to be powered by the power supply grid, powered by the battery, or powered by the power supply grid and the battery according to actual work requirements, so that the welding machine can work stably in different application scenarios, and the flexibility and adaptability of the welding machine are improved.

[0011] The electric welding machine power supply circuit provided by the present application allows the electric welding machine to be powered by a battery when there is no power supply from the power supply grid, thereby reducing the dependence on the power supply grid and reducing the risk of equipment damage caused by the instability of the power supply grid. The electric welding machine power supply circuit provided by the present application can provide a power supply mode in which the power supply grid and the battery jointly provide power. The coordinated power supply of the power supply grid and the battery can reduce the power supply current output by the power supply grid, thereby avoiding the problem of grid tripping during the use of the electric welding machine, which is conducive to improving the stability of the power supply grid.

[0012] In some embodiments, the first power supply circuit includes a first switch tube, and the output state of the first power supply circuit is controlled by the first switch tube;

[0013] The second power supply circuit includes a second switch tube, and the second switch tube is used to control the output state of the second power supply circuit.

[0014] In some embodiments, the power supply circuit further includes:

[0015] An output rectifier circuit includes a first diode and a second diode, wherein a first end of the first diode is connected to a first end of the secondary side of the transformer, a first end of the second diode is connected to a second end of the secondary side of the transformer, and a second end of the first diode and a second end of the second diode are connected and serve as an output end of the output rectifier circuit.

[0016] In some embodiments, the secondary side of the transformer includes a first winding and a second winding;

[0017] The first end of the first diode is connected to the first end of the first winding, and the first end of the second diode is connected to the first end of the second winding;

[0018] The second end of the first winding is connected to the second end of the second winding as a center tap of the transformer.

[0019] In some embodiments, a ground terminal of the first power supply circuit is connected to a ground terminal of the second power supply circuit.

[0020] According to some embodiments, the present application further provides a welding machine power supply method, which is implemented by using the welding machine power supply circuit provided by the above embodiments, and provides at least the following three power supply modes:

[0021] First power supply mode: the first power supply circuit outputs the first power supply current to the load, and the second power supply circuit is turned off;

[0022] Second power supply mode: the second power supply circuit outputs a second power supply current to the load, and the first power supply circuit is turned off;

[0023] Third power supply mode: the first power supply circuit and the second power supply circuit jointly output a target power supply current to the load, and the target power supply current includes the first power supply current provided by the first power supply circuit and the second power supply current provided by the second power supply circuit.

[0024] The welding machine power supply method provided by the present application can provide at least three different power supply modes, so that the welding machine can flexibly select the power supply mode according to the actual work requirements, thereby improving the flexibility and adaptability of the welding machine. By providing the second power supply mode, the welding machine is allowed to use the battery for power supply when there is no power supply from the power supply grid, thereby reducing the dependence on the power supply grid and reducing the risk of equipment damage caused by the instability of the power supply grid. In the third power supply mode, the power supply current output by the power supply grid can be reduced by the coordinated power supply of the power supply grid and the battery, thereby avoiding the problem of power grid tripping during the use of the welding machine, which is conducive to improving the stability of the power supply grid.

[0025] In some embodiments, the power supply method includes:

[0026] Displaying a power supply mode selection interface, wherein the power supply mode selection interface displays the first power supply mode, the second power supply mode, and the third power supply mode;

[0027] In response to the selection instruction obtained through the power supply mode selection interface, the corresponding power supply mode is enabled.

[0028] In some embodiments, the first power supply circuit includes a first switch tube, and the first switch tube is used to control the output state of the first power supply circuit; the second power supply circuit includes a second switch tube, and the second switch tube is used to control the output state of the second power supply circuit;

[0029] When the third power supply mode is enabled, the power supply method further includes:

[0030] Adjusting the duty cycle of the first switch tube to control the first power supply circuit to output the first power supply current of a first current value;

[0031] The duty cycle of the second switch tube is adjusted to control the second power supply loop to output the second power supply current of a second current value.

[0032] In some embodiments, when the third power supply mode is enabled, the power supply method further includes:

[0033] Obtaining a target current value of the target power supply current;

[0034] determining the first current value of the first supply current according to the current limit of the first power supply circuit;

[0035] The second current value of the second power supply current is determined according to a difference between the target current value and the first current value.

[0036] In some embodiments, when the third power supply mode is enabled, the power supply method further includes:

[0037] Display the power supply distribution ratio adjustment interface;

[0038] In response to an input instruction acquired by the power supply allocation ratio adjustment interface, an allocation ratio of the first power supply current and the second power supply loop in the target power supply current is determined.

[0039] In some embodiments, when the second power supply mode is enabled, the power supply method further includes:

[0040] monitoring the remaining power of the battery in the second power supply circuit;

[0041] When the remaining power is lower than a preset minimum power threshold, an alarm message is issued.

[0042] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application.

[0043] Other advantages, objectives and features of the present application will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and study, or can be taught from the practice of the present application to some extent. The objectives and other advantages of the present application can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings.

[0045] Figure 1 A schematic diagram of a power supply circuit for a welding machine provided in some embodiments of the present application;

[0046] Figure 2 A schematic diagram of a power supply circuit for a welding machine provided in some other embodiments of the present application;

[0047] Figure 3 A schematic diagram of a flow chart of selecting a power supply mode in a power supply method for a welding machine provided in some embodiments of the present application;

[0048] Figure 4 A schematic diagram of a flow chart of a welding machine power supply method provided in some embodiments of the present application when the third power supply mode is enabled;

[0049] Figure 5 A schematic diagram of a flow chart of a welding machine power supply method provided in some other embodiments of the present application when the third power supply mode is enabled;

[0050] Figure 6 A schematic diagram of a flow chart of a welding machine power supply method provided in some embodiments of the present application when the second power supply mode is enabled. DETAILED DESCRIPTION

[0051] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0052] 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 belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0053] It is understood that the terms "first", "second", "third", etc. used in this application may be used herein 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, without departing from the scope of this application, a first power supply circuit may be referred to as a second power supply circuit, and similarly, a second power supply circuit may be referred to as a first power supply circuit. Both the first power supply circuit and the second power supply circuit are power supply circuits, but they are not the same power supply circuit.

[0054] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0055] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0056] The welding process of electric welders has extremely high requirements for the stability and reliability of the power supply. However, the traditional power supply method of electric welders relies on the power supply of the power grid. In areas where the power grid is unstable or cannot be covered, welding operations are difficult to carry out, and it is easy to cause the power grid to trip when the electric welder is in use. It can be seen that there are limitations.

[0057] Based on this, the present application hopes to provide a solution that can solve the above technical problems, can provide a variety of different power supply modes, allow the electric welder to flexibly select the power supply mode according to actual work requirements, and improve the flexibility and adaptability of the electric welder. The details will be described in the subsequent embodiments.

[0058] In one aspect, the present application provides a welding machine power supply circuit. Figure 1 The power supply circuit may specifically include: a transformer T1, a first power supply circuit, a second power supply circuit and a control circuit.

[0059] Specifically, the primary side of the transformer T1 is connected to the first power supply circuit, and the secondary side of the transformer T1 is connected to the load; the first power supply circuit is powered by the power supply grid; the control circuit is connected to the first power supply circuit to control the output state of the first power supply circuit; the second power supply circuit is powered by a battery and is connected in parallel to the secondary side of the transformer; the control circuit is also connected to the second power supply circuit to control the output state of the second power supply circuit.

[0060] The power supply circuit of the electric welding machine includes a first power supply circuit provided by a power supply grid, and a second power supply circuit provided by a battery, and the second power supply circuit is connected in parallel to the secondary side of the transformer T1, thereby providing a variety of different power supply modes for the electric welding machine. By controlling the output states of the first power supply circuit and the second power supply circuit through the control circuit, the power supply mode can be flexibly switched, and the steps are simple and easy to implement. With the power supply circuit, the electric welding machine can choose to be powered by the power supply grid, powered by the battery, or powered by the power supply grid and the battery according to actual work needs, so that the electric welding machine can work stably in different application scenarios, and the flexibility and adaptability of the electric welding machine are improved.

[0061] The power supply circuit of the electric welding machine allows the electric welding machine to be powered by a battery when there is no power supply from the power grid, thereby reducing the dependence on the power grid and reducing the risk of equipment damage caused by unstable power grid. The power supply circuit of the electric welding machine can provide a power supply mode in which the power grid and the battery jointly provide power. The coordinated power supply of the power grid and the battery can reduce the power supply current output by the power grid, thereby avoiding the problem of grid tripping during the use of the electric welding machine, which is conducive to improving the stability of the power grid.

[0062] like Figure 1 As shown, the power grid involved in the present application can provide AC input current. The battery involved in the present application can include lithium battery, lead-acid battery, nickel-cadmium battery and nickel-metal hydride battery, etc., but is not limited thereto. Figure 1 The battery is powered by a lithium battery as an example.

[0063] In some embodiments, the first power supply circuit may include a first switch tube, so that the first switch tube is used to control the output state of the first power supply circuit. Figure 1 The second power supply circuit includes a second switch tube Q1, so that the second switch tube Q1 is used to control the output state of the second power supply circuit.

[0064] By setting the first switch tube and the second switch tube Q1, the magnitude of the first power supply current output by the first power supply circuit can be adjusted by adjusting the duty cycle of the first switch tube, and the magnitude of the second power supply current output by the second power supply circuit can be adjusted by adjusting the duty cycle of the second switch tube Q1. By independently adjusting the duty cycles of the first switch tube and the second switch tube Q1, the current distribution ratio of the first power supply circuit and the second power supply circuit is achieved.

[0065] In the above embodiment, the control circuit is connected to the first power supply circuit, and the output state of the first power supply circuit is controlled by adjusting the duty cycle of the first switch tube. The control circuit is connected to the second power supply circuit, and the output state of the second power supply circuit is controlled by adjusting the duty cycle of the second switch tube Q1.

[0066] Considering that the electric welder requires a DC power supply to generate a stable arc to achieve welding of the workpiece to be processed, in some embodiments, the power supply circuit also includes an output rectifier circuit for converting the AC power provided by the power supply grid into a DC power supply suitable for welding.

[0067] Please continue reading Figure 1The output rectifier circuit may specifically include a first diode D1 and a second diode D2, wherein a first end of the first diode D1 is connected to a first end 3 of the secondary side of the transformer T1, a first end of the second diode D2 is connected to a second end 4 of the secondary side of the transformer T1, and a second end of the first diode D1 is connected to a second end of the second diode D2 and serves as an output end of the output rectifier circuit.

[0068] In some other embodiments, see Figure 2 The secondary side of the transformer T1 may include a first winding N1 and a second winding N2. The first end of the first winding N1 is connected to the first end of the first diode D1 as the first end 3 of the secondary side of the transformer T1; the first end of the second winding N2 is connected to the first end of the second diode D2 as the second end 4 of the secondary side of the transformer T1. The second end of the first winding N1 is connected to the second end of the second winding as the center tap 5 of the transformer T1.

[0069] Understandably, Figure 1 In the power supply circuit shown, the output rectifier circuit adopts a full-wave rectifier mode. The first diode D1 and the second diode D2 can both play a rectifying role and a freewheeling role. Figure 2 In the power supply circuit shown, the output rectifier circuit adopts a half-wave rectifier mode, wherein the first diode D1 plays a rectifier role, and the second diode D2 plays a freewheeling role. In addition, a full-bridge rectifier mode can also be used for output rectification, which is not limited in the present application.

[0070] Please combine the following Figure 2 , some embodiments of the power supply circuit are described in more detail to understand the present invention.

[0071] In the first power supply loop, the power supply grid is connected to the primary side of the transformer T1 through the AC input ports L and N. The secondary side of the transformer T1 converts the AC power supply into a DC power supply through the first diode D1 and the second diode D2. The rectified first power supply current flows to the load through the inductor L1 to complete the power supply.

[0072] In the second power supply circuit, a lithium battery power supply module is used to provide power. For example, Figure 2 As shown, a BUCK step-down circuit can be used to reduce the voltage provided by the battery (lithium battery power supply module) to a voltage level that matches the load.

[0073] Specifically, the two ends of the filter capacitor C1 are respectively connected to the positive electrode and the negative electrode of the lithium battery power supply module, and are thus connected in parallel to the lithium battery power supply module. The gate G of the second switch tube Q1 is controlled by the control circuit, thereby controlling the conduction state of the second switch tube Q1, and then controlling the output state of the second power supply circuit. The second power supply current conducted by the second switch tube Q1 passes through the inductor L2 and flows to the load to complete the power supply.

[0074] In the above example, efficient voltage conversion and stable output can be achieved by controlling the on and off of the second switch tube Q1 and combining the functions of the inductor L2 and the filter capacitor C1.

[0075] Exemplarily, a third diode D3 may be provided in the second power supply loop for current guidance and battery backflow protection. Specifically, a first end of the third diode D3 is connected to the source S of the second switch tube Q1, and a second end of the third diode D3 is grounded.

[0076] And, for example Figure 2 As shown, the ground terminal of the first power supply circuit is connected to the ground terminal of the second power supply circuit, the inductor L1 of the first power supply circuit is connected to the inductor L2 of the second power supply circuit. The first end of the load is connected to the connection point of the inductor L1 and the inductor L2, and the second end of the load is grounded.

[0077] Exemplarily, the control circuit can sample the first power supply current on the side of the inductor L1 close to the load, and calculate the output power of the first power supply circuit accordingly; and sample the second power supply current on the side of the inductor L2 close to the load, and calculate the output power of the second power supply circuit accordingly. In addition, exemplarily, the control circuit can also calculate how much power the first power supply circuit and the second power supply circuit should output respectively by sampling the current.

[0078] The load involved in the embodiments of the present application may include welding rods and welding wires, etc., but is not limited thereto.

[0079] In the first power supply circuit, electric energy is transmitted from the power supply grid to the primary side of the transformer T1. This part of the power supply circuit (also referred to as the primary main circuit of the welding machine) can be implemented in topological forms such as full-bridge topology, half-bridge topology, dual-tube forward topology, single-ended forward topology and phase-shifted full-bridge topology, but is not limited to this. It can be understood that the specific implementation method of converting the power provided by the power supply grid into a voltage and current suitable for input to the primary side of the transformer T1 is not the focus of this application, and this method can also refer to the relevant technology, which will not be further described here.

[0080] Those skilled in the art will understand that Figure 1 and Figure 2The structure shown in the figure is only a block diagram of a part of the structure related to the scheme of the present application, and does not constitute a limitation on the elements to which the scheme of the present application is applied. The specific power supply circuit may include more or fewer elements than those shown in the figure, or combine certain elements, or have a different arrangement of elements.

[0081] Based on the same inventive concept, the present application also provides a welding machine power supply method. The power supply method is implemented using the welding machine power supply circuit provided by the above embodiment, and provides at least the following three power supply modes: a first power supply mode, a second power supply mode and a third power supply mode.

[0082] In the first power supply mode, the first power supply circuit outputs the first power supply current to the load, and the second power supply circuit is turned off. In the second power supply mode, the second power supply circuit outputs the second power supply current to the load, and the first power supply circuit is turned off. In the third power supply mode, the first power supply circuit and the second power supply circuit jointly output the target power supply current to the load, and the target power supply current includes the first power supply current provided by the first power supply circuit and the second power supply current provided by the second power supply circuit.

[0083] The power supply method for the electric welder can provide at least three different power supply modes, so that the electric welder can flexibly select the power supply mode according to the actual work requirements, thereby improving the flexibility and adaptability of the electric welder. By providing the second power supply mode, the electric welder is allowed to use the battery for power supply when there is no power supply from the power supply grid, thereby reducing the dependence on the power supply grid and reducing the risk of equipment damage caused by the instability of the power supply grid. In the third power supply mode, the power supply current output by the power supply grid can be reduced by the coordinated power supply of the power supply grid and the battery, thereby avoiding the problem of grid tripping during the use of the electric welder, which is conducive to improving the stability of the power supply grid.

[0084] In some embodiments, Figure 3 As shown, the power supply method may specifically include the following steps S110 to S120.

[0085] In step S110 , a power supply mode selection interface is displayed, and the power supply mode selection interface shows the first power supply mode, the second power supply mode and the third power supply mode as described above.

[0086] In step S120, in response to the selection instruction obtained by the power supply mode selection interface, the corresponding power supply mode is enabled.

[0087] As an example, the power supply mode selection interface may be a user interface (UI) displayed on a display device of the electric welding machine, and an operator may select a desired power supply mode through the UI.

[0088] When the third power supply mode is enabled, as an example, the power supply method may control the first power supply loop to output a first power supply current of a first current value by adjusting the duty cycle of the first switch tube.

[0089] Similarly, the power supply method may also control the second power supply loop to output a second power supply current of a second current value by adjusting the duty cycle of the second switch tube Q1 .

[0090] In some embodiments, Figure 4 As shown, when the third power supply mode is enabled, the power supply method may further include the following steps S210 to S230.

[0091] In step S210 , a target current value of a target power supply current is acquired.

[0092] Exemplarily, the target current value may be calculated based on influencing factors such as the power demand required for the operation of the load and the working state of the load.

[0093] In step S220, a first current value of a first power supply current is determined according to a current limit of a first power supply loop.

[0094] Since the first power supply current output by the first power supply circuit is limited by the carrying capacity of the actual circuit, for example, the current limit of the welding machine may be constrained by factors such as fuses and sockets, etc. Therefore, the maximum current value that the first power supply circuit can provide can be calculated according to the above-mentioned limiting conditions and used as the first current value.

[0095] In step S230 , a second current value of the second power supply current is determined according to the difference between the target current value and the first current value.

[0096] When the output capacity of the first power supply circuit is insufficient to meet the target power supply current requirement, the second power supply circuit makes up for the shortfall. Specifically, the difference between the target current value and the first current value can be calculated to determine the value of the supplementary current that needs to be provided by the second power supply circuit, which is used as the second current value. On this basis, the control circuit can adjust the output state of the second power supply circuit according to the calculation result to ensure that the total current output by the first power supply circuit and the second power supply circuit reaches the target current value.

[0097] The above embodiment can adaptively adjust the distribution ratio of the power supply grid and the battery power supply according to the current limit of the first power supply circuit and the working requirements of the electric welder, ensuring that the electric welder can still maintain stable operation without being restricted by the power supply grid when the current of the first power supply circuit is limited. Therefore, when the power supply capacity of the first power supply circuit is insufficient, the second power supply circuit is promptly enabled for supplementary power supply, thereby effectively improving the power supply efficiency and stability of the power supply method, reducing the risk in the single power supply mode, and avoiding the situation where welding is interrupted due to the current limit of the first power supply circuit.

[0098] In other embodiments, Figure 5 As shown, when the third power supply mode is enabled, the power supply method may also include the following steps S310 to S320.

[0099] In step S310, a power supply distribution ratio adjustment interface is displayed.

[0100] In step S320, in response to an input instruction acquired by the power supply allocation ratio adjustment interface, an allocation ratio of the first power supply current and the second power supply loop in the target power supply current is determined.

[0101] The difference from the previous embodiment is that in this embodiment, the distribution ratio of the power supply current can be actively set by the user through the power supply distribution ratio adjustment interface, which enhances the interactivity between the electric welding machine and the user, thereby improving the adaptability and flexibility of the power supply method, so that the power supply method can be further applied to application scenarios where the power supply distribution ratio needs to be adjusted according to different work requirements. For example, when the user wants to give priority to using batteries or reduce dependence on the power supply grid, the distribution ratio can be actively set through the power supply distribution ratio adjustment interface.

[0102] As an example, the power distribution ratio adjustment interface may be a user interface displayed on a display device of the electric welding machine, and an operator may set the distribution ratio of the first power supply current and the second power supply circuit in the target power supply current through the user interface.

[0103] When the second power supply mode is enabled, in some embodiments, such as Figure 6 As shown, the power supply method may further include the following steps S410 to S420.

[0104] In step S410, the remaining power of the battery in the second power supply circuit is monitored.

[0105] Exemplarily, the remaining power of the battery is monitored in real time to obtain the current remaining power of the battery. This monitoring process can be implemented by a battery management system (BMS), but is not limited to this. The BMS can provide state parameters of the remaining power, such as the remaining capacity percentage of the battery.

[0106] In step S420, when the remaining power is lower than a preset minimum power threshold, an alarm message is issued.

[0107] The embodiments of the present application do not specifically limit the form of the alarm information. For example, the user can be informed that the battery is about to run out by emitting a buzzer, flashing an indicator light, or displaying a low-battery warning on a display device, thereby reminding the user to take timely measures, such as replacing the battery or switching the power supply mode, etc., to avoid interruption of the welding machine's operation due to power outages.

[0108] It should be noted that the welding machine power supply method in the embodiments of the present application can be implemented by the corresponding welding machine power supply circuit. Therefore, the technical features between the method embodiment and the circuit embodiment can be replaced and supplemented with each other without causing conflicts, so that technical personnel in this field can understand the technical content of this application.

[0109] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features of the above-described 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.

[0110] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A welding machine power supply circuit, characterized in that: include: Transformer, first power supply circuit, second power supply circuit and control circuit; wherein, The primary side of the transformer is connected to the first power supply circuit, and the secondary side of the transformer is connected to the load; The first power supply circuit is powered by a power supply grid; the control circuit is connected to the first power supply circuit to control the output state of the first power supply circuit; The second power supply circuit is powered by a battery and is connected in parallel to the secondary side of the transformer; the control circuit is also connected to the second power supply circuit to control the output state of the second power supply circuit.

2. The welding machine power supply circuit according to claim 1, characterized in that: The first power supply circuit includes a first switch tube, and the output state of the first power supply circuit is controlled by the first switch tube; The second power supply circuit includes a second switch tube, and the second switch tube is used to control the output state of the second power supply circuit.

3. The welding machine power supply circuit according to claim 1, characterized in that: The power supply circuit further includes: An output rectifier circuit includes a first diode and a second diode, wherein a first end of the first diode is connected to a first end of the secondary side of the transformer, a first end of the second diode is connected to a second end of the secondary side of the transformer, and a second end of the first diode and a second end of the second diode are connected and serve as an output end of the output rectifier circuit.

4. The welding machine power supply circuit according to claim 3, characterized in that: The secondary side of the transformer includes a first winding and a second winding; The first end of the first diode is connected to the first end of the first winding, and the first end of the second diode is connected to the first end of the second winding; The second end of the first winding is connected to the second end of the second winding as a center tap of the transformer.

5. The welding machine power supply circuit according to claim 1, characterized in that: The ground end of the first power supply circuit is connected to the ground end of the second power supply circuit.

6. A method for supplying power to an electric welding machine, characterized in that: The power supply method is implemented by using the welding machine power supply circuit as described in any one of claims 1 to 5, and the power supply method provides at least the following three power supply modes: First power supply mode: the first power supply circuit outputs the first power supply current to the load, and the second power supply circuit is turned off; Second power supply mode: the second power supply circuit outputs a second power supply current to the load, and the first power supply circuit is turned off; Third power supply mode: the first power supply circuit and the second power supply circuit jointly output a target power supply current to the load, and the target power supply current includes the first power supply current provided by the first power supply circuit and the second power supply current provided by the second power supply circuit.

7. The welding machine power supply method according to claim 6, characterized in that: The power supply method comprises: Displaying a power supply mode selection interface, wherein the power supply mode selection interface displays the first power supply mode, the second power supply mode, and the third power supply mode; In response to the selection instruction obtained through the power supply mode selection interface, the corresponding power supply mode is enabled.

8. The welding machine power supply method according to claim 7, characterized in that: The first power supply circuit includes a first switch tube, and the output state of the first power supply circuit is controlled by the first switch tube; the second power supply circuit includes a second switch tube, and the output state of the second power supply circuit is controlled by the second switch tube; When the third power supply mode is enabled, the power supply method further includes: Adjusting the duty cycle of the first switch tube to control the first power supply circuit to output the first power supply current of a first current value; The duty cycle of the second switch tube is adjusted to control the second power supply loop to output the second power supply current of a second current value.

9. The welding machine power supply method according to claim 8, characterized in that: When the third power supply mode is enabled, the power supply method further includes: Obtaining a target current value of the target power supply current; determining the first current value of the first supply current according to the current limit of the first power supply circuit; The second current value of the second power supply current is determined according to a difference between the target current value and the first current value.

10. The welding machine power supply method according to claim 8, characterized in that: When the third power supply mode is enabled, the power supply method further includes: Display the power supply distribution ratio adjustment interface; In response to an input instruction acquired by the power supply allocation ratio adjustment interface, an allocation ratio of the first power supply current and the second power supply loop in the target power supply current is determined.

11. The welding machine power supply method according to claim 7, characterized in that: When the second power supply mode is enabled, the power supply method further includes: monitoring the remaining power of the battery in the second power supply circuit; When the remaining power is lower than a preset minimum power threshold, an alarm message is issued.

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