Input voltage control circuit and system for electric welding machine

Abstract

The utility model discloses an input voltage control circuit and system for an electric welding machine, and relates to the technical field of electromechanical control. Comprising a voltage access end, a rectification unit, a voltage conversion unit, a soft start unit, a voltage filtering unit and an output unit, improvement is carried out on the basis of an input power supply of an existing electric welding machine product, the input voltage control circuit for the electric welding machine is designed, various different input voltages can be accessed according to the use scene, and the input voltage control circuit is suitable for the electric welding machine. A soft start unit is designed to protect the whole input voltage control circuit, it is guaranteed that an electric welding machine product can be driven under different power supply voltage scenes, and the electric welding machine can work normally under single-phase 220V input, single-phase 380V input or three-phase 380V input.

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