Electric welding machine power supply circuit and power supply method

Abstract

The application 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 circuit, a second power supply circuit and a 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 a load; the first power supply circuit is provided with a power supply by a power supply network; the control circuit is connected to the first power supply circuit and is used for controlling the output state of the first power supply circuit; the second power supply circuit is provided with a power supply by a battery and is connected in parallel to the secondary side of the transformer; and the control circuit is also connected to the second power supply circuit and is used for controlling the output state of the second power supply circuit. The electric welding machine power supply circuit can provide multiple different power supply modes, allows the electric welding machine to flexibly select a power supply mode according to actual work requirements, and improves the flexibility and adaptability of the electric welding machine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric welding machine, and particularly relates to a power supply circuit and a power supply method of electric welding machine. BACKGROUND

[0002] The electric welding machine is a device that uses the high-temperature arc generated by the short circuit of the positive and negative poles to melt the welding material on the welding rod and the welding material, so as to combine the contacted objects.

[0003] The process of the welding operation of the electric welding machine has a very high requirement for the stability and reliability of the power supply. However, the traditional power supply mode of the electric welding machine depends on the power grid power supply. In the area where the power grid is unstable or cannot be covered, the welding operation is difficult to carry out, and the power grid is also prone to tripping when the electric welding machine is used. Therefore, the traditional power supply mode of the electric welding machine has limitations.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0005] Therefore, the electric welding machine power supply circuit and the power supply method provided by the embodiments of the present application can provide a plurality of different power supply modes, allow the electric welding machine to flexibly select the power supply mode according to the actual work requirement, and improve the flexibility and adaptability of the electric welding machine.

[0006] According to some embodiments, the present application provides an electric welding machine power supply circuit, comprising 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 provided with a power supply by a power grid; and the control circuit is connected to the first power supply circuit, and is used for controlling the output state of the first power supply circuit.

[0009] The second power supply circuit is provided with a power supply by a battery, and is connected in parallel to the secondary side of the transformer; and the control circuit is also connected to the second power supply circuit, and is used for controlling 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 with power supply by a power supply network and a second power supply circuit provided with power supply by a battery, and the second power supply circuit is connected in parallel to the secondary side of the transformer, thereby providing multiple different power supply modes for the welding machine. The output state of the first power supply circuit and the second power supply circuit is controlled by the control circuit, so that flexible switching of the power supply mode can be realized, and the steps are simple and easy to realize. By using the power supply circuit provided by the present application, the welding machine can select power supply provided by the power supply network, power supply provided by the battery, or power supply provided by the power supply network and the battery together according to actual working requirements, so that the welding machine can stably work in different application scenarios, and the flexibility and adaptability of the welding machine are improved.

[0011] The welding machine power supply circuit provided by the present application allows the welding machine to be powered by the battery without power supply from the power supply network, thereby reducing the dependence on the power supply network and reducing the risk of equipment damage caused by unstable power supply network. The welding machine power supply circuit provided by the present application can provide a power supply mode in which power supply is provided by the power supply network and the battery together, and the power supply current output by the power supply network can be reduced by cooperative power supply of the power supply network and the battery, thereby avoiding the problem of power grid tripping during use of the welding machine, and being conducive to improving the stability of the power supply network.

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

[0013] The second power supply circuit comprises a second switch tube, and the output state of the second power supply circuit is controlled by using the second switch tube.

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

[0015] The output rectifier circuit comprises a first diode and a second diode, 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 comprises a first winding and a second winding.

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

[0018] The second end of the first winding and the second end of the second winding are connected and serve as a center tap of the transformer.

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

[0020] According to some embodiments, another aspect of the present application also provides a power supply method for electric welding machine, which is implemented by the power supply circuit for electric welding machine provided in the foregoing embodiments. The power supply method provides at least three power supply modes as follows:

[0021] 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.

[0022] 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.

[0023] 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, wherein 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 power supply method for electric welding machine provided in the present application can provide at least three different power supply modes, so that the electric welding machine can flexibly select the power supply mode according to the actual working requirement, thereby improving the flexibility and adaptability of the electric welding machine. By providing the second power supply mode, the electric welding machine is allowed to use the battery for power supply in the case that there is no power supply network, thereby reducing the dependence on the power supply network and reducing the risk of equipment damage caused by the instability of the power supply network. In the third power supply mode, the power supply network and the battery cooperatively supply power, which can reduce the power supply current output by the power supply network, thereby avoiding the problem of power grid tripping during the use of the electric welding machine, and being conducive to improving the stability of the power supply network.

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

[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] enabling the corresponding power supply mode in response to the selection instruction obtained by the power supply mode selection interface.

[0028] In some embodiments, the first power supply circuit comprises a first switch tube, and the output state of the first power supply circuit is controlled by using the first switch tube; the second power supply circuit comprises a second switch tube, and the output state of the second power supply circuit is controlled by using the second switch tube.

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

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

[0031] adjusting a duty cycle of the second switch tube to control the second power supply circuit to output the second power supply current with a second current value.

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

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

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

[0035] determining the second current value of the second power supply current 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 comprises:

[0037] displaying a power supply distribution ratio adjustment interface;

[0038] determining a distribution ratio of the first power supply current and the second power supply circuit in the target power supply current in response to an input instruction obtained by the power supply distribution ratio adjustment interface.

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

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

[0041] when the remaining power is lower than a preset minimum power threshold, issuing an alarm information.

[0042] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application.

[0043] Other advantages, objects, and features of the present application will be understood more fully from the following detailed description, from the appended claims, and from the drawings. It is to be expressly understood that the drawings are for illustrative purposes and are not a limitation on the scope of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0044] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments thereof as read with the accompanying drawings.

[0045] Figure 1 A structure diagram of a power supply circuit of a welding machine is provided for some embodiments of the present application.

[0046] Figure 2 A structure diagram of a power supply circuit of a welding machine is provided for some embodiments of the present application.

[0047] Figure 3 A flowchart of selecting a power supply mode in a power supply method of a welding machine is provided for some embodiments of the present application.

[0048] Figure 4 A flowchart of enabling a third power supply mode in a power supply method of a welding machine is provided for some embodiments of the present application.

[0049] Figure 5 A flowchart of enabling a third power supply mode in a power supply method of a welding machine is provided for some embodiments of the present application.

[0050] Figure 6 A flowchart of enabling a second power supply mode in a power supply method of a welding machine is provided for some embodiments of the present application. DETAILED DESCRIPTION

[0051] In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the relevant drawings. The drawings show embodiments of the present application. 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 commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the specification of the present application is only for the purpose of describing specific embodiments and is not intended to limit the present application.

[0053] It can be understood that the terms "first", "second", "third", and the like used herein can be used in the description of 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 the present application, a first power supply circuit can be referred to as a second power supply circuit, and similarly, a second power supply circuit can be referred to as a first power supply circuit. The first power supply circuit and the second power supply circuit are both power supply circuits, but they are not the same power supply circuit.

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

[0055] As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It should also be understood that the term "comprising" or "having" etc., specifies the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but does not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, the term "and / or" as used in the specification includes any and all combinations of one or more of the associated listed items.

[0056] The process of the electric welding machine performing welding operation has very high requirements for the stability and reliability of the power supply. However, the traditional power supply mode of the electric welding machine relies on power grid power supply, and in the area where the power grid is unstable or cannot cover, the welding operation is difficult to perform, and the power grid is also prone to tripping when the electric welding machine is used. It can be seen that it has limitations.

[0057] Therefore, the present application aims to provide a solution to solve the above technical problems, which can provide multiple different power supply modes, allowing the electric welding machine to flexibly select the power supply mode according to the actual work demand, and improving the flexibility and adaptability of the electric welding machine. The detailed content will be described in the subsequent embodiments.

[0058] In one aspect, the present application provides a power supply circuit of an electric welding machine. Please refer to Figure 1 The power supply circuit can 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 provided with power supply by the power grid; the control circuit is connected to the first power supply circuit for controlling the output state of the first power supply circuit; the second power supply circuit is provided with power supply by the battery and is connected in parallel to the secondary side of the transformer; and the control circuit is also connected to the second power supply circuit for controlling the output state of the second power supply circuit.

[0060] The power supply circuit of the electric welding machine includes the first power supply circuit provided with power supply by the power grid and the second power supply circuit provided with power supply by the battery, and the second power supply circuit is connected in parallel to the secondary side of the transformer T1, thereby providing multiple different power supply modes for the electric welding machine. By controlling the output state of the first power supply circuit and the second power supply circuit through the control circuit, flexible switching of the power supply mode can be realized, which is simple and easy to implement. By using the power supply circuit, the electric welding machine can select power supply by the power grid, power supply by the battery, or power supply by the power grid and the battery together according to the actual work demand, 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 the battery without the power supply network, thereby reducing the dependence on the power supply network and reducing the risk of equipment damage caused by instability of the power supply network. The power supply circuit of the electric welding machine can provide a power supply mode in which the power supply network and the battery jointly provide power supply. The coordinated power supply of the power supply network and the battery can reduce the output power supply current of the power supply network, thereby avoiding the problem of power grid tripping during use of the electric welding machine, and facilitating improvement of the stability of the power supply network.

[0062] As shown in Figure 1 , the power supply network involved in the present application can provide alternating current input current. The battery involved in the present application can include a lithium battery, a lead-acid battery, a nickel-cadmium battery, a nickel-hydrogen battery, and the like, but is not limited thereto. Figure 1 For example, the battery uses a lithium battery power supply module.

[0063] In some embodiments, the first power supply circuit can include a first switch tube, so as to control the output state of the first power supply circuit by using the first switch tube. Please continue to refer to Figure 1 , the second power supply circuit includes a second switch tube Q1, so as to control the output state of the second power supply circuit by using the second switch tube Q1.

[0064] By setting the first switch tube and the second switch tube Q1, the size 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 size 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 realized.

[0065] In the above embodiments, the control circuit accesses the first power supply circuit to control the output state of the first power supply circuit by adjusting the duty cycle of the first switch tube, and the control circuit accesses the second power supply circuit to control the output state of the second power supply circuit by adjusting the duty cycle of the second switch tube Q1.

[0066] Considering that the electric welding machine needs a direct current power supply to generate a stable arc to realize welding of the workpiece to be processed, in some embodiments, the power supply circuit further includes an output rectifier circuit for converting alternating current power supplied by the power supply network into direct current power suitable for welding.

[0067] Please continue to refer to Figure 1The output rectifier circuit can specifically include a first diode D1 and a second diode D2. The first end of the first diode D1 is connected to the first end 3 of the secondary side of the transformer T1, the first end of the second diode D2 is connected to the second end 4 of the secondary side of the transformer T1, and the second end of the first diode D1 and the second end of the second diode D2 are connected and serve as the output end of the output rectifier circuit.

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

[0069] It can be understood that, in Figure 1 the power supply circuit shown, the output rectifier circuit adopts a full-wave rectification mode. Among them, the first diode D1 and the second diode D2 can both play a rectifying role and also play a freewheeling role. In Figure 2 the power supply circuit shown, the output rectifier circuit adopts a half-wave rectification mode. Among them, the first diode D1 plays a rectifying role, and the second diode D2 plays a freewheeling role. In addition, a full-bridge rectification mode can also be used for output rectification, and the present application does not limit this.

[0070] The following will be combined Figure 2 to understand some embodiments of the power supply circuit for more detailed description.

[0071] In the first power supply circuit, the power supply grid is connected to the primary side of the transformer T1 through the AC input port 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 first power supply current after rectification flows through the inductor L1 to the load, completing the power supply.

[0072] In the second power supply circuit, a lithium battery power supply module is used to provide power. Exemplarily, as Figure 2 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 matched with the load.

[0073] Specifically, the filter capacitor C1 is connected to the positive and negative poles of the lithium battery power supply module respectively, thereby being 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 further controlling the output state of the second power supply circuit. The second power supply current passing through the second switch tube Q1 passes through the inductor L2 and flows to the load, thereby completing the power supply.

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

[0075] For example, in the second power supply circuit, a third diode D3 can also be arranged for current guidance and battery backflow protection. Specifically, the first end of the third diode D3 is connected to the source S of the second switch tube Q1, and the second end of the third diode D3 is grounded.

[0076] For example, Figure 2 As shown, the ground end of the first power supply circuit is connected to the ground end of the second power supply circuit, and 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] For example, 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, for example, 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 related to the embodiments of the present application can include a welding rod, a welding wire, and the like, but is not limited thereto.

[0079] In the first power supply circuit, the power grid transmits power to the primary side of the transformer T1. This part of the power supply circuit (which can also be referred to as the original side main circuit of the electric welder) can be implemented in the form of a full-bridge topology, a half-bridge topology, a double-tube forward topology, a single-end forward topology, a phase-shifted full-bridge topology, and the like, but is not limited thereto. It can be understood that the specific implementation of converting the power provided by the power grid into a voltage and current suitable for input to the primary side of the transformer T1 is not the focus of the present application, and this method can also be referred to related technologies, which will not be described further herein.

[0080] Those skilled in the art can understand that Figure 1 and Figure 2The structure shown in the figure is only a block diagram of 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. Specifically, the power supply circuit can 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, another aspect of the present application also provides a power supply method for a welding machine. The power supply method is implemented by using the power supply circuit for a welding machine provided in the foregoing embodiments, and at least provides three power supply modes: a first power supply mode, a second power supply mode, and a third power supply mode.

[0082] The first power supply mode outputs a first power supply current to the load by the first power supply circuit, and the second power supply circuit is turned off. The second power supply mode outputs a second power supply current to the load by the second power supply circuit, and the first power supply circuit is turned off. The third power supply mode outputs a target power supply current to the load by the first power supply circuit and the second power supply circuit together, 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 a welding machine 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 working requirement, 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 in the case where there is no power supply network, thereby reducing the dependence on the power supply network and reducing the risk of equipment damage caused by the instability of the power supply network. In the third power supply mode, the power supply by the power supply network and the battery together can reduce the power supply current output by the power supply network, thereby avoiding the problem of power grid tripping during the use of the welding machine, and being conducive to improving the stability of the power supply network.

[0084] In some embodiments, as shown in Figure 3 The power supply method can specifically include the following steps S110-S120.

[0085] In step S110, a power supply mode selection interface is displayed, and the power supply mode selection interface displays 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 a 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 can be a user interface (User Interface, referred to as UI) displayed on the display device of the welding machine. The operator can select the required power supply mode through the user interface.

[0088] In the third power supply mode, the power supply method can control the first power supply current outputted by the first power supply loop to be the first current value by adjusting the duty cycle of the first switch tube, for example.

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

[0090] In some embodiments, as shown in Figure 4 When the third power supply mode is enabled, the power supply method can further include steps S210-S230, for example.

[0091] In step S210, the target current value of the target power supply current is obtained.

[0092] The target current value can be calculated according to the power demand required by the load operation, the working state of the load, and other influencing factors, for example.

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

[0094] Since the first power supply current outputted by the first power supply loop is limited by the actual circuit carrying capacity, for example, the current limit of the electric welder can be constrained by factors such as fuses and sockets. Therefore, the maximum current value that the first power supply loop can provide can be calculated according to the above-mentioned limiting conditions, and this is taken as the first current value.

[0095] In step S230, the 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 loop is insufficient to meet the target power supply current demand, then the second power supply loop makes up the insufficient part. Specifically, the value of the supplementary current that needs to be provided by the second power supply loop can be determined by calculating the difference between the target current value and the first current value, and this is taken as the second current value. On this basis, the control circuit can adjust the output state of the second power supply loop according to the calculation result to ensure that the total amount of current outputted by the first power supply loop and the second power supply loop together 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 requirement of the electric welding machine, so as to ensure that the electric welding machine can still work stably under the condition that the current of the first power supply circuit is limited, and is not limited by the power supply grid. Therefore, when the power supply capacity of the first power supply circuit is insufficient, the second power supply circuit is enabled in time to supplement the power supply, so as to effectively improve the power supply efficiency and stability of the power supply method, reduce the risk under a single power supply mode, and avoid the situation that the welding is interrupted due to the current limit of the first power supply circuit.

[0098] In some other embodiments, as shown in FIG. 11, when the third power supply mode is enabled, the power supply method can further include steps S310-S320. Figure 5

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

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

[0101] Different from the previous embodiment, in the present 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 that require adjustment of the power supply distribution ratio according to different working requirements. For example, when the user wants to preferentially use the battery or reduce the 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 supply distribution ratio adjustment interface can be a user interface displayed on the display device of the electric welding machine. The operator can 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, as shown in FIG. 11, the power supply method can further include steps S410-S420. Figure 6

[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. The monitoring process can be implemented by a battery management system (BMS), but is not limited thereto. The BMS can provide a state parameter of the remaining power, for example, a remaining capacity percentage of the battery.

[0106] In step S420, when the remaining power is lower than the preset minimum power threshold, an alarm information is sent out.

[0107] The form of the alarm information is not specifically limited in the embodiments of the present application. For example, the user can be informed that the battery power is about to be exhausted by sending out a beeping sound, flashing an indicator light, or displaying a low power warning on a display device, so as to remind the user to take measures in time, for example, replacing the battery or switching the power supply mode, etc., to avoid the work interruption of the electric welding machine due to power failure.

[0108] It should be noted that the power supply methods of the electric welding machine in the embodiments of the present application can be implemented by corresponding electric welding machine power supply circuits, so that the technical features between the method embodiments and the circuit embodiments can be replaced and supplemented with each other without conflict, so that the technical content of the present application can be known to those skilled in the art.

[0109] The technical features of the above-described embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features of the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0110] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An electric welding machine power supply circuit, characterized by, The power supply circuit comprises: a transformer, a first power supply circuit, a second power supply circuit and a control circuit, wherein a primary side of the transformer is connected to the first power supply circuit, and a secondary side of the transformer is connected to a load; the first power supply circuit is powered by a power grid, and the control circuit is connected to the first power supply circuit to control an 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, and the control circuit is also connected to the second power supply circuit to control an output state of the second power supply circuit; the control circuit controls the output states of the first power supply circuit and the second power supply circuit to switch a power supply mode of the electric welding machine power supply circuit, and the electric welding machine power supply circuit has a first power supply mode, a second power supply mode and a third power supply mode; in the first power supply mode, the first power supply circuit outputs a 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 a second power supply current to the load, and the first power supply circuit is turned off; and in the 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 comprises 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.

2. The electric welding machine power supply circuit according to claim 1, wherein the first power supply circuit comprises a first switch tube, and the output state of the first power supply circuit is controlled by using the first switch tube; the second power supply circuit comprises a second switch tube, and the output state of the second power supply circuit is controlled by using the second switch tube.

3. The power supply circuit for a welder as defined in claim 1, wherein, The power supply circuit further comprises: an output rectifier circuit, wherein the output rectifier circuit comprises a first diode and a second diode, 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 electric welding machine power supply circuit according to claim 3, wherein the secondary side of the transformer comprises a first winding and a second winding; the first end of the first diode is connected to a first end of the first winding, and the first end of the second diode is connected to a first end of the second winding; a second end of the first winding and a second end of the second winding are connected and serve as a center tap of the transformer.

5. The power supply circuit for a welder as defined in claim 1, wherein, a ground end of the first power supply circuit is connected to a ground end of the second power supply circuit.

6. A method of supplying power to an electric welding machine, characterized by, The power supply method is implemented by using the electric welding machine power supply circuit according to any one of claims 1 to 5, and the power supply method provides at least the following three power supply modes: in the first power supply mode, the first power supply circuit outputs a 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 a second power supply current to the load, and the first power supply circuit is turned off; and in the 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 comprises 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. A 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, the target power supply current including 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 power supply method of an electric welder according to claim 6, wherein The power supply method comprises: displaying a power supply mode selection interface, the power supply mode selection interface displaying the first power supply mode, the second power supply mode and the third power supply mode; in response to a selection instruction obtained by the power supply mode selection interface, enabling a corresponding power supply mode.

8. The power supply method for electric welder as claimed in claim 7, wherein, 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 comprises: adjusting the duty cycle of the first switch tube to control the first power supply circuit to output the first power supply current with a first current value; adjusting the duty cycle of the second switch tube to control the second power supply circuit to output the second power supply current with a second current value.

9. The power supply method of an electric welder according to claim 8, wherein, When the third power supply mode is enabled, the power supply method further comprises: obtaining a target current value of the target power supply current; determining the first current value of the first power supply current according to the current limit of the first power supply circuit; determining the second current value of the second power supply current according to the difference between the target current value and the first current value.

10. The power supply method of an electric welder according to claim 8, wherein, When the third power supply mode is enabled, the power supply method further comprises: displaying a power supply distribution ratio adjustment interface; in response to an input instruction obtained by the power supply distribution ratio adjustment interface, determining the distribution ratio of the first power supply current and the second power supply circuit in the target power supply current.

11. The power supply method of an electric welder according to claim 7, wherein, When the second power supply mode is enabled, the power supply method further comprises: 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, issuing an alarm information.

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