0 foreword
Pulse MIG(Metal Inert Gas) is one kind fuses extremely inert gase protects solder. Welder of digital pulse MIG has a lot of advantage, important place is had in production industry. Power source of inversion of development arc solder has important sense.
Report of arc solder inversion is come from on century since 80 time are published, perfect through ceaseless development, already became solder the mainstream product of power source. The inversion frequency of power source of arc solder inversion is in commonly 20 ～ 100kHz, because current inversion power supply uses imitate circuit control more, limitted function of inversion power source rise. The digitlization of welder is to solder now the tide that equipment develops, it makes digital control application becomes a possibility at power source of arc solder inversion. In home, the research that digitlizes welder still is in start level, than the world advanced level still has very big difference. This makes we study power source of arc solder inversion had very big necessary.

Main circuit of 1 power source is designed
1. 1 system is summarized
Pulse MIG solder is one kind solders electric current is periodic of change extremely fused inert gase protects solder, it to soldering equipment asks taller. The switch frequency of main circuit wants tall, answer speed to want fast, trends answers function to be close friends, ripple of output electric current wants small, want what a variety of material, welding wire diameters fall in different condition to be able to get used to a variety of soldering solder demand. If the graph is shown 1 times, pulse MIG welder basically divides composition by 6 ministries.

1. 1. 1 advocate loop
Advocate the power transformation circuit that loop is a system, the commutate of three-phase alternating current that its function is the 380V that gets on electrified wire netting is hand-in-hand inversion of bridge-type of travel intermediate frequency, via be being outputted after rectification again, output electric current can amount to 450 ～ 500A.
1. 1. 2 drive circuit
Drive circuit has protective function, prevent to had appeared to flow, the circumstance such as overheat. Transistor of the insulation bar in drive inversion loop high-power (IGBT) is right spark pulse requirement is strict, its switch loss also with spark the slope of pulse, extent closely related.
1. 1. 3 advocate accuse board circuit
Advocate accuse board circuit is part of welder pilot core. Used on control change control of PI of closed circuit of parameter electric current and control of PI of voltage closed circuit. The system alternates through D ／ A the imitate that sends drive board inputs a mouth, via drive IGBT output. Pilot feedback measures the sampling of the voltage that is final output and electric current to be worth.
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