A welding machine and its inverter power supply device

Abstract

A welding machine and its inverter power supply device are disclosed, relating to the field of welding machine technology. The inverter power supply device includes a heat dissipation mechanism and an inverter mechanism coupled to the heat dissipation mechanism. The heat dissipation mechanism includes a heat sink, a water pump, and a circulating water tank. The heat sink is provided with liquid-cooled heat dissipation channels. The liquid-cooled heat dissipation channels, the water pump, and the circulating water tank are connected in series via pipelines. The inverter mechanism includes a transformer whose output is adapted for electrical connection to the welding machine, an inverter module electrically connected to the transformer and equipped with an insulated-gate bipolar transistor (IGBT) module, a main circuit assembly and a bypass assembly connected in parallel to the inverter module, a drive circuit electrically connected to the IGBT module, and a microcontroller unit electrically connected to the drive circuit and the transformer. The main circuit assembly includes a main circuit three-phase rectifier and a main circuit contactor. The bypass assembly includes a bypass contactor, a bypass relay, and a bypass three-phase rectifier. A first heat dissipation plane is provided at the bottom of the IGBT module. The first heat dissipation plane is attached to the heat sink.

Description

Technical Field

[0001] This utility model relates to the field of welding machine technology, and more specifically, to a welding machine and its inverter power supply device. Background Technology

[0002] In industrial production, especially for high-power equipment like aluminum can welding machines, the power supply circuits generate a significant amount of heat during operation. If this heat cannot be dissipated effectively and promptly, it will lead to excessively high equipment temperatures, potentially causing thermal damage to components, affecting the stability and reliability of the equipment, and even shortening its lifespan. Traditional cooling methods, such as simple air cooling or basic cooling systems, are often insufficient to meet the heat dissipation requirements of high-power-density inverter mechanisms.

[0003] Traditional inverter power supply systems often suffer from low heat dissipation efficiency and uneven heat distribution. This is especially true for complex inverter mechanisms that include both main and bypass dual rectifier systems, where traditional heat dissipation designs struggle to meet the cooling needs of different heat-generating components. Furthermore, the heat generated by power devices such as rectifier diodes and filter capacitors lacks effective heat dissipation pathways, easily leading to localized overheating and consequently affecting the performance and lifespan of the entire power supply system.

[0004] On the other hand, existing inverter power supply devices have shortcomings in the integrated design of the heat dissipation system and the electrical system. The connection between the heat dissipation mechanism and the inverter mechanism is often not tight enough, resulting in low heat conduction efficiency. In particular, the heat dissipation effect of critical heat-generating components such as IGBT modules directly affects the operational stability of the entire inverter power supply device. How to achieve efficient thermal coupling between the heat dissipation mechanism and the inverter mechanism while ensuring electrical insulation performance is a major technical challenge currently faced in the design of inverter power supply devices. Utility Model Content

[0005] This invention provides a welding machine and its inverter power supply device, which aims to improve at least one of the above-mentioned technical problems.

[0006] To solve the above-mentioned technical problems, this utility model provides an inverter power supply device for a welding machine, which includes a heat dissipation mechanism and an inverter mechanism connected to the heat dissipation mechanism.

[0007] The heat dissipation mechanism includes a heat sink, a water pump, and a circulating water tank. The heat sink is provided with a liquid cooling channel. The liquid cooling channel, the water pump, and the circulating water tank are connected in series via pipelines.

[0008] The inverter mechanism includes a transformer with its output terminal adapted for electrical connection to a welding machine, an inverter module electrically connected to the transformer and equipped with an insulated-gate bipolar transistor (IGBT) module, a main circuit assembly and a bypass assembly connected in parallel to the inverter module, a drive circuit electrically connected to the IGBT module, and a microcontroller unit electrically connected to the drive circuit and the transformer. The main circuit assembly includes a main circuit three-phase rectifier and a main circuit contactor. The bypass assembly includes a bypass contactor, a bypass relay, and a bypass three-phase rectifier. The output terminals of the main circuit three-phase rectifier and the bypass three-phase rectifier are electrically connected to the inverter module to rectify 380V three-phase AC power into DC power. The main circuit contactor is connected to the positive output terminal of the main circuit three-phase rectifier. The bypass contactor is connected to the 380V three-phase input terminal of the bypass three-phase rectifier. The bypass relay is connected to the bypass contactor to control the connection and disconnection of the bypass contactor.

[0009] The bottom of the insulated gate bipolar transistor module is provided with a first heat dissipation plane. The first heat dissipation plane is attached to the heat sink.

[0010] As a further optimization, both the main three-phase rectifier and the bypass three-phase rectifier include six rectifier diodes. These six rectifier diodes are divided into three groups of two diodes connected in series in the same direction, forming three diode combinations. The middle position between the two diodes in each combination serves as the input terminal, used to input one phase of the 380V three-phase AC power. The positive terminal of the diode combination is electrically connected to the negative terminal of the inverter module. The negative terminal of the diode combination is electrically connected to the positive terminal of the inverter module.

[0011] As a further optimization, the bypass assembly also includes three bypass resistors. The three bypass resistors are electrically connected between the three input terminals of the bypass three-phase rectifier and the bypass contactor, respectively.

[0012] As a further optimization, the main circuit assembly also includes three compensation capacitors. One end of each of the three compensation capacitors is electrically connected to the input terminal of the three diode combinations. The other ends of the three compensation capacitors are electrically connected together.

[0013] As a further optimization, the main circuit assembly also includes a filter capacitor. The filter capacitor is a polarized capacitor. The positive terminal of the filter capacitor is electrically connected to the positive output terminal of the main circuit three-phase rectifier. The negative terminal of the filter capacitor is electrically connected to the negative output terminal of the main circuit three-phase rectifier.

[0014] The main contactor is located between the positive output terminal of the main three-phase rectifier and the filter capacitor.

[0015] As a further optimization, both the main three-phase rectifier and the bypass three-phase rectifier are provided with metal substrates. The metal substrates are attached to the heat sink using thermally conductive silicone grease.

[0016] As a further optimization, the casing of the bypass resistor is attached to the heat sink using thermal grease.

[0017] As a further optimization, the inverter mechanism also includes a power module. The power module is electrically connected to the water pump, the microcontroller unit, and the drive circuit.

[0018] As a further optimization, the heat dissipation mechanism also includes a water-cooling component connected to the circulating water tank, and an air-cooling component connected to the water-cooling component. The water-cooling component is configured to absorb heat from the cooling water in the circulating water tank via refrigerant and transfer it to the air-cooling component for heat dissipation.

[0019] This application also provides a welding machine that includes an inverter power supply device for a welding machine as described in any paragraph of the first aspect.

[0020] By adopting the above technical solution, the present invention can achieve the following technical effects: The present application provides an inverter power supply device for a welding machine. Through the tight connection between the liquid cooling heat dissipation channel and the inverter mechanism, combined with the design of a dual rectifier system for the main circuit and the bypass circuit, it effectively solves the problems of low heat dissipation efficiency and local overheating in traditional systems. It has the advantages of efficient heat dissipation and improved equipment operation stability and reliability. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the specific embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is the circuit diagram of an inverter power supply device.

[0023] Figure 2 This is a schematic diagram of the heat dissipation of the inverter power supply device. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0025] Example 1: In existing technologies, high-power equipment in industrial production, such as aluminum can welding machines, often faces the challenge of temperature control. The core components generate a large amount of heat during operation, and traditional heat dissipation methods, primarily air cooling, are insufficient for effective cooling.

[0026] Depend on Figures 1 to 2 As shown, this utility model embodiment provides an inverter power supply device for a welding machine, which includes a heat dissipation mechanism and an inverter mechanism connected to the heat dissipation mechanism.

[0027] The heat dissipation mechanism includes a heat sink, a water pump, and a circulating water tank. The heat sink is equipped with liquid-cooled heat dissipation channels. The liquid-cooled heat dissipation channels, the water pump, and the circulating water tank are connected in series via piping. The liquid-cooled heat dissipation channels refer to the fluid circulation paths embedded inside the heat sink, which can specifically adopt a serpentine or mesh flow channel design to remove heat through forced convection. The circulating water tank, as a storage container for the cooling medium, can be equipped with a water level sensor to monitor the coolant level.

[0028] In this embodiment, as Figure 2 As shown, the heat sink is made of metal. The flow channels are sealed by milling channels into the two plates and then sealing them with sealing rings. In other embodiments, the liquid cooling channels can also be obtained by drilling holes directly with a long drill bit. This invention does not impose specific limitations on this method.

[0029] The inverter mechanism includes a transformer with its output terminals adapted for electrical connection to a welding machine, an inverter module electrically connected to the transformer and equipped with an insulated-gate bipolar transistor (IGBT) module, a main circuit assembly and a bypass assembly connected in parallel to the inverter module, a drive circuit electrically connected to the IGBT module, and a microcontroller unit (MCU) electrically connected to the drive circuit and the transformer. The main circuit assembly includes a main circuit three-phase rectifier and a main circuit contactor. The bypass assembly includes a bypass contactor, a bypass relay, and a bypass three-phase rectifier. The output terminals of the main circuit three-phase rectifier and the bypass three-phase rectifier are electrically connected to the inverter module to rectify 380V three-phase alternating current (DC) into direct current (AC). The main circuit contactor is connected to the positive output terminal of the main circuit three-phase rectifier. The bypass contactor is connected to the 380V three-phase input terminal of the bypass three-phase rectifier. The bypass relay is connected to the bypass contactor to control the switching on and off of the bypass contactor. Preferably, the microcontroller unit is connected to both the bypass relay and the main contactor to control the switching on and off of the main contactor.

[0030] The main circuit three-phase rectifier converts high-voltage AC power to DC power, and a contactor is installed at its positive output terminal to control the circuit's on / off state. The relays in the bypass assembly act as electronic switches, controlling the conduction state of the high-current circuit through a low-voltage signal.

[0031] The insulated-gate bipolar transistor (IGBT) module has a first heat dissipation plane at its bottom. This first heat dissipation plane is attached to the heat sink. The planarization of the bottom of the IGBT module increases the contact area and improves thermal conductivity. In this embodiment, the transformer's metal casing is directly and tightly attached to the heat sink using thermally conductive silicone grease. In other embodiments, a specially designed heat dissipation base plate can be customized for the transformer, and then the base plate is fixed to the heat sink.

[0032] Specifically, the coolant circulates along the heat sink channels driven by the water pump, absorbing the heat generated by the transistor modules. When the main circuit is operating normally, the main circuit contactor closes, and the three-phase AC power is rectified and supplied to the inverter module. When an abnormal current is detected, the bypass relay triggers the bypass circuit to prevent overload damage to the main circuit. The microcontroller unit monitors system parameters in real time and coordinates the operation of the drive circuit and the heat dissipation mechanism. The heat sink acts as a heat exchange medium, transferring the heat generated by the electrical components to the coolant, which is then processed by external cooling equipment to maintain system thermal balance.

[0033] Compared to pure air cooling solutions, this approach improves heat dissipation uniformity. The main-bypass dual-path design enhances system redundancy, automatically switching power supply lines under overload conditions. The planar bonding structure between the transistor module and the heatsink simplifies the installation process and reduces contact thermal resistance. Through these technical solutions, this application effectively controls component operating temperatures, preventing performance degradation caused by overheating. The dual-circuit power supply design improves system reliability, avoiding downtime caused by single-point failures. The composite heat dissipation structure adapts to high power density scenarios, maintaining stable operation of the equipment in harsh environments. Heat in temperature-sensitive areas is rapidly dissipated, reducing the risk of localized overheating and extending the service life of critical components.

[0034] Based on the above embodiments, in an optional embodiment of the present invention, such as Figure 1 As shown, both the main three-phase rectifier and the bypass three-phase rectifier include six rectifier diodes. These six diodes are arranged in three groups of two, connected in series in the same direction, forming three diode combinations. The middle position between the two diodes in each combination serves as the input terminal, used to input one phase of the 380V three-phase AC power. The positive terminal of the diode combination is electrically connected to the negative terminal of the inverter module. The negative terminal of the diode combination is electrically connected to the positive terminal of the inverter module.

[0035] Preferred, such as Figure 1 As shown, the bypass assembly also includes three bypass resistors. These three bypass resistors are electrically connected between the three input terminals of the bypass three-phase rectifier and the bypass contactor, respectively. The bypass resistors are used to limit inrush current.

[0036] Specifically, the three-phase alternating current is converted into direct current through a full-bridge rectifier circuit consisting of six diodes. The bypass resistor limits the sudden change in input current when the bypass contactor is closed, preventing damage to the rectifier diodes and subsequent circuitry.

[0037] Traditional three-phase rectifier circuits typically lack surge suppression measures at the input, making contactor contacts susceptible to burnout from current surges. This solution effectively mitigates the problem of sudden current changes during circuit closure by adding a current-limiting resistor to the bypass circuit.

[0038] Preferred, such as Figure 1 As shown, the main circuit assembly also includes three compensation capacitors and one filter capacitor. One end of each of the three compensation capacitors is electrically connected to the input terminals of the three diode combinations. The other ends of the three compensation capacitors are electrically connected together. The filter capacitor is a polarized capacitor. The positive terminal of the filter capacitor is electrically connected to the positive output terminal of the main circuit three-phase rectifier. The negative terminal of the filter capacitor is electrically connected to the negative output terminal of the main circuit three-phase rectifier. The main circuit contactor is located between the positive output terminal of the main circuit three-phase rectifier and the filter capacitor.

[0039] Compensation capacitors are capacitive components connected across the input terminals of a rectifier bridge. In the front end of a 380V three-phase input rectifier, a capacitor is connected to ground (or neutral point) at each phase input terminal, and the midpoints of these three capacitors are connected together. This connection method usually forms a Y-type (star-type) EMI filter circuit, which is also often called a "three-phase filter capacitor" or "safety capacitor".

[0040] A filter capacitor is an energy storage element connected in parallel to the rectifier output terminal. It is used to smooth the pulsating DC voltage after rectification. The main circuit contactor is located between the positive output terminal of the rectifier and the filter capacitor, meaning that an electromagnetic contactor is used as the main circuit switch; specifically, an AC contactor can be used to control the on / off state of the main circuit.

[0041] Specifically, the compensation capacitors form a star-shaped filter network at the three-phase input terminals, suppressing high-frequency interference and improving three-phase imbalance. The filter capacitors establish a stable DC bus voltage at the rectifier output terminals, providing a stable power supply environment for the inverter module. A main circuit contactor is installed between the rectifier output terminals and the filter capacitors, enabling rapid disconnection of the main circuit under abnormal operating conditions, protecting the filter capacitors from surge current damage.

[0042] In existing technologies, rectifiers generally lack voltage balancing devices at the input end, which can easily lead to output voltage fluctuations due to three-phase imbalance. However, this solution significantly improves the symmetry of the input voltage through the star connection structure of the compensation capacitor.

[0043] Through the above technical solutions, this application achieves multiple protections and stability improvements for the three-phase rectifier circuit. Effective suppression of surge current reduces arc erosion of contactor contacts. The introduction of compensation capacitors balances input voltage fluctuations. The reasonable layout of filter capacitors ensures the stability of the DC bus. The position setting of the main contactor provides overcurrent protection for the filter capacitors.

[0044] Based on the above embodiments, in an optional embodiment of the present invention, the main three-phase rectifier and the bypass three-phase rectifier are provided with metal substrates. The metal substrates are attached to the heat sink using thermally conductive silicone grease. Preferably, the housing of the bypass resistor is attached to the heat sink using thermally conductive silicone grease.

[0045] A heat sink is the core heat transfer component of a liquid cooling system. Specifically, it can be implemented by embedding liquid cooling channels in an aluminum alloy plate, serving as an intermediate carrier for the transfer of heat to the coolant.

[0046] The metal substrate refers to the supporting structure that carries the electronic components of the rectifier. It can be made of aluminum or copper alloy materials, and its high thermal conductivity allows it to quickly dissipate the heat generated inside the rectifier. Thermal grease is a thermally conductive medium that is filled at the contact surface between the metal substrate and the heat sink. It can be made of a mixture of silicone oil and zinc oxide and is used to eliminate microscopic gaps at the contact surface to reduce thermal resistance.

[0047] The bypass resistor housing refers to the protective shell that encloses the resistor material. Specifically, it can be made of anodized aluminum. Its direct contact with the heat sink allows the heat generated by the resistor to be quickly transferred to the liquid cooling system.

[0048] A metal substrate is fixed to the bottom of the main and bypass three-phase rectifiers. Heat generated by the rectifier diodes during operation is conducted through the metal substrate to the heat sink surface. Thermal grease is applied in a uniform, thin layer to the interface between the metal substrate and the heat sink, filling the microscopic gaps between them and forming a continuous heat conduction path. Coolant in the internal liquid cooling channels of the heat sink circulates and carries away heat, achieving continuous heat dissipation for the rectifier. The bypass resistor's casing is tightly bonded to the heat sink surface using thermal grease. The Joule heat generated by the resistor is conducted through the casing to the heat sink, where it, along with the rectifier heat, is processed by the liquid cooling system.

[0049] This solution utilizes the synergistic effect of a metal substrate and thermal grease to centrally conduct heat from the rectifier and bypass resistor to the liquid cooling system, forming a unified thermal management architecture and resolving the temperature gradient problem caused by discrete heat dissipation. Through this technical solution, this application achieves centralized heat conduction from the rectifier and bypass resistor, effectively reducing operating temperature fluctuations of power devices. The tight fit between the metal substrate and the heat sink prevents the formation of localized hot spots, and the application of thermal grease improves interface heat transfer efficiency. The direct contact between the bypass resistor housing and the heat sink solves the problem of insufficient heat dissipation from the resistor element in traditional solutions, ensuring that the system maintains a stable thermal balance during continuous operation.

[0050] Based on the above embodiments, in an optional embodiment of the present invention, such as Figure 1 As shown, the inverter mechanism further includes a power module. The power module is electrically connected to the water pump, the microcontroller unit, and the drive circuit. Preferably, the heat dissipation mechanism further includes a water-cooling component coupled to the circulating water tank, and an air-cooling component coupled to the water-cooling component. The water-cooling component is configured to absorb heat from the cooling water in the circulating water tank via refrigerant and transfer it to the air-cooling component for heat dissipation.

[0051] A power module is a device that provides electrical energy to the water pump, microcontroller unit, and drive circuit. It can be implemented using a switching power supply or a DC regulated power supply, and its function is to provide a stable operating voltage for each component. A water-cooling assembly is a device that transfers heat through the principle of phase change heat transfer. It can be implemented using a refrigeration cycle system including a compressor, evaporator, and condenser, and its function is to transfer the heat carried by the cooling water in the circulating water tank to the external environment. An air-cooling assembly is a device that dissipates heat using forced convection. It can be implemented using an axial fan combined with aluminum heat sink fins, and its function is to accelerate the dissipation of heat carried by the refrigerant.

[0052] The cooling water circulates between the tanks. As the temperature of the cooling water rises within the tanks, the evaporator coils of the water-cooled components absorb heat, and the refrigerant, driven by the compressor, transfers this heat to the condenser of the air-cooled components. An axial fan continuously blows air across the condenser fins, rapidly dissipating the heat carried by the refrigerant into the air. This composite heat dissipation method, through two heat exchange processes, ensures timely heat removal from the inverter mechanism while avoiding the failure risk of a single heat dissipation method under extreme conditions.

[0053] Traditional welding machine cooling systems often employ a single water-cooling or air-cooling structure, which is prone to a sharp drop in heat dissipation efficiency under high temperature and humidity environments. This solution, through the cascading of water-cooling and air-cooling components, achieves graded heat transfer and dispersed heat dissipation, improving the environmental adaptability of the cooling system and reducing system energy consumption through the integrated power supply design of the power module. Through the above technical solution, this application effectively solves the problem of component overheating caused by insufficient heat dissipation in the inverter power supply device during continuous operation, while avoiding the risk of short circuits caused by condensation of cooling water in low-temperature environments. The coordinated operation of the water-cooled and air-cooled components ensures the stable operation of the heat dissipation system under different environmental conditions, and the centralized power supply design of the power module further improves the system reliability.

[0054] Based on the above embodiments, in an optional embodiment of the present invention, The MCU uses a Microchip Technology DSP, specifically the DSPIC33FJ16GS606. This chip is a high-performance 16-bit DSPIC processor with high computing power and low power consumption. Furthermore, this processor supports multiple communication interfaces, including UART, SPI, and CAN bus, facilitating communication with other devices.

[0055] The power supply module is a Mean Well high-efficiency switching power supply module (5V, 12V, 15V module). This module can stabilize the input voltage to the required output voltage and has high conversion efficiency and low power consumption. Using this module can reduce energy loss and improve the overall performance of the inverter.

[0056] The IGBT module model is FF200R12KE3 (rated current 200A). The IGBT drive circuit module model is 2SD315AI. The filter capacitor model is Black Diamond 470UF / 450V. The power transformer's turns ratio is 25:1.

[0057] Example 2: This application also provides a welding machine that includes an inverter power supply device for a welding machine as described in any paragraph of Example 1.

[0058] Obviously, the above detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to describe preferred embodiments, not all embodiments, and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Based on the embodiments of the present invention, any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art to all other embodiments obtained without inventive effort are within the scope of protection of the present invention.

Claims

1. An inverter power supply device for a welding machine, characterized in that, It includes a heat dissipation mechanism and an inverter mechanism coupled to the heat dissipation mechanism; The heat dissipation mechanism includes a heat dissipation plate, a water pump, and a circulating water tank; the heat dissipation plate is provided with a liquid cooling heat dissipation channel; the liquid cooling heat dissipation channel, the water pump, and the circulating water tank are connected in series through pipelines; The inverter mechanism includes a transformer with its output terminal adapted for electrical connection to a welding machine, an inverter module electrically connected to the transformer and equipped with an insulated-gate bipolar transistor module, a main circuit assembly and a bypass assembly connected in parallel to the inverter module, a drive circuit electrically connected to the insulated-gate bipolar transistor module, and a microcontroller unit electrically connected to the drive circuit and the transformer. The main circuit assembly includes a main circuit three-phase rectifier and a main circuit contactor. The bypass assembly includes a bypass contactor, a bypass relay, and a bypass three-phase rectifier. The output terminals of the main circuit three-phase rectifier and the bypass three-phase rectifier are electrically connected to the inverter module to rectify 380V three-phase AC power into DC power. The main circuit contactor is connected to the positive output terminal of the main circuit three-phase rectifier. The bypass contactor is connected to the 380V three-phase input terminal of the bypass three-phase rectifier. The bypass relay is connected to the bypass contactor to control the connection and disconnection of the bypass contactor. The bottom of the insulated gate bipolar transistor module is provided with a first heat dissipation plane; the first heat dissipation plane is attached to the heat sink.

2. The inverter power supply device for a welding machine according to claim 1, characterized in that, The main three-phase rectifier and the bypass three-phase rectifier each include six rectifier diodes; the six rectifier diodes are divided into three groups of two diodes connected in series in the same direction to form three diode combinations; the middle position of the two diodes in the diode combination is used as the input terminal to input one phase of the 380V three-phase AC power; the positive terminal of the diode combination is electrically connected to the negative terminal of the inverter module; the negative terminal of the diode combination is electrically connected to the positive terminal of the inverter module.

3. The inverter power supply device for a welding machine according to claim 2, characterized in that, The bypass assembly also includes three bypass resistors; the three bypass resistors are electrically connected between the three input terminals of the bypass three-phase rectifier and the bypass contactor, respectively.

4. The inverter power supply device for a welding machine according to claim 2, characterized in that, The main circuit assembly also includes three compensation capacitors; one end of each of the three compensation capacitors is electrically connected to the input terminal of the three diode combinations; the other ends of the three compensation capacitors are electrically connected together.

5. The inverter power supply device for a welding machine according to claim 1, characterized in that, The main circuit assembly also includes a filter capacitor; the filter capacitor is a polarized capacitor; the positive terminal of the filter capacitor is electrically connected to the positive output terminal of the main circuit three-phase rectifier; the negative terminal of the filter capacitor is electrically connected to the negative output terminal of the main circuit three-phase rectifier. The main contactor is located between the positive output terminal of the main three-phase rectifier and the filter capacitor.

6. The inverter power supply device for a welding machine according to claim 2, characterized in that, The main three-phase rectifier and the bypass three-phase rectifier are provided with metal substrates; the metal substrates are attached to the heat sink with thermal grease.

7. The inverter power supply device for a welding machine according to claim 3, characterized in that, The casing of the bypass resistor is attached to the heat sink using thermally conductive silicone grease.

8. An inverter power supply device for a welding machine according to any one of claims 1 to 7, characterized in that, The inverter mechanism also includes a power module; the power module is electrically connected to the water pump, the microcontroller unit, and the drive circuit.

9. An inverter power supply device for a welding machine according to any one of claims 1 to 7, characterized in that, The heat dissipation mechanism further includes a water-cooling component connected to the circulating water tank, and an air-cooling component connected to the water-cooling component; wherein the water-cooling component is configured to absorb heat from the cooling water in the circulating water tank through a refrigerant and transfer it to the air-cooling component for heat dissipation by the air-cooling component.

10. A welding machine, characterized in that, An inverter power supply device for a welding machine as described in any one of claims 1 to 9.

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