Multifunctional welder control circuit and method capable of automatically resisting high-frequency and high-voltage breakdown

Abstract

The invention discloses a multifunctional welder control circuit and method capable of automatically resisting high-frequency and high-voltage breakdown. The circuit comprises a rectifying module, a protecting module, an inverting module, a power supply circuit, a control board module, a wire feeding circuit, a wire feeding motor module and an arc striking high-voltage module, and further comprises an anti-interference isolation module; the anti-interference isolation module is connected with the control board module, the wire feeding circuit and the wire feeding motor module, is used for isolation protection of the wire feeding motor module and the wire feeding circuit under control by the control board module, or communicates with the wire feeding circuit and the wire feeding motor module for normal gas shielded welding; and the control board module realizes switching of a welder between a gas shielded welding mode and a plasma argon arc welding mode through control of the anti-interference isolation module and the arc striking high-voltage module. The circuit can eliminate high-frequency harmonic waves of plasma argon arc welding during high-frequency arc striking to effectivelyprevent the breakdown or damage phenomenon of a driving part of the wire feeding motor.

Description

technical field [0001] The invention relates to the technical field of welding machines, in particular to a multifunctional welding machine control circuit and method for automatically resisting high-frequency and high-voltage breakdown. Background technique [0002] At present, the multifunctional welding machines without automatic anti-high frequency interference (traditional multifunctional welding machines) in the prior art generally include two functions of plasma argon arc welding and gas shielded welding. Such as figure 1 As shown, in terms of circuit composition, a multifunctional welding machine without automatic anti-high-frequency interference includes a rectifier module 10, a protection module 20, an inverter module 30, an arc high-voltage module 40, a power circuit 50, and a control board module 60 , wire feeding circuit 70, wire feeding motor module 80, welding torch and workpiece. Among them, the rectifier module 10 is composed of the main switch K1, the rec...

AI Technical Summary

Problems solved by technology

[0003] When the traditional multi-functional welding machine uses high-frequency arc ignition in plasma argon arc welding, because the welder uses high-frequency high-voltage with a frequency of hundreds of thousands of hertz and a voltage of several thousand volts (such as 2500V), it breaks down the air gap to form an arc, so high High-frequency arc ignition is a strong harmonic interference source, which may cause breakdown or damage to the low-voltage DC 24V wire feeding circuit of the same system

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