Split-type multifunctional underwater arc welding power supply and operating method thereof

A split-type multifunctional underwater arc welding power supply, comprising a shore power supply module and an underwater power supply module, wherein

• the shore power supply module includes a shore power supply main circuit unit and a shore power supply control unit;
• the shore power supply main circuit unit includes an input filter circuit, an IGBT full-bridge inverter circuit, an intermediate frequency transformer, and an output rectification filter circuit;
• the shore power supply control unit includes a shore power supply digital signal controller, an inverter driving circuit, an output voltage sampling circuit;
• the underwater power supply module includes an underwater power supply main circuit unit and an underwater power supply control unit;
• the underwater power supply main circuit unit includes a chopping circuit, an output filtering circuit;
• the underwater supply control unit includes an underwater power supply digital signal controller, a booster circuit, a chopping driving circuit, a welding voltage sampling circuit, a welding current sampling circuit, a given voltage setting circuit and a given current setting circuit;
• the shore power supply module is arranged on a shore, and the underwater power supply module is carried underwater;
• and
• an input power supply, the input filter circuit, the IGBT full-bridge inverter circuit, the intermediate frequency transformer and the output rectification filter circuit are sequentially connected in series;
• the output rectification filter circuit is connected to an input terminal of the output voltage sampling circuit, and an output terminal of the output voltage sampling circuit is connected to the shore power supply digital signal controller;
• an output terminal for control signals of the shore power supply digital signal controller is connected to an input terminal of the inverter driving circuit, an output terminal of the inverter driving circuit is connected to a controlled terminal of the IGBT full-bridge inverter circuit;
• an output terminal of the output rectification filter circuit is respectively connected to an input terminal of the chopping circuit and an input terminal of the booster circuit;
• an output terminal of the chopping circuit is connected to an input terminal of the output filter circuit, and an output terminal of the output filter circuit is connected to a torch and a workpiece;
• an output terminal of the booster circuit is connected to the torch and the workpiece;
• the torch and the workpiece are respectively connected to an input terminal of the welding voltage sampling circuit and an input terminal of the welding current sampling circuit;
• an output terminal of the welding voltage sampling circuit, an output terminal of the welding current sampling circuit, an output terminal of the given voltage setting circuit and an output terminal of the given current setting circuit are all connected to the underwater power supply digital signal controller;
• the output terminal for control signals of the underwater power supply digital signal controller is connected to an input terminal of the chopping driving circuit;
• an output terminal of the chopping driving circuit is respectively connected to a controlled terminal of the chopping circuit and a controlled terminal of the booster circuit;
• and the shore power supply digital signal controller is communicatively connected to the underwater power supply digital signal controller.