Welding machine arc striking control circuit

Abstract

The invention discloses a welding machine arc striking control circuit. The welding machine arc striking control circuit comprises a pulse witch sampling circuit, an error comparison amplifier circuit, a pulse width setting circuit and a pulse width recovery circuit; the pulse witch sampling circuit is used for obtaining pulse driving signals from an inverter driving circuit which is arranged in a welding machine to generate pulse width sampling signals; the pulse width setting circuit is used for generating pulse width setting signals; the error comparison amplifier circuit is used for enabling the pulse width sampling signals to be in comparison with the pulse width setting signals and lowering the pulse width control voltage in the welding machine after error signals which are obtained through comparison are amplified; the pulse width recovery circuit is used for enabling the pulse width control voltage to be recovered to the preset working voltage after the arc striking of the welding machine succeeds. According to the welding machine arc striking control circuit, the pulse width of the pulse driving signals during the arc striking of the welding machine is reduced and accordingly the impact current in the process of the arc striking of the welding machine can be significantly reduced, the impact on related devices which are arranged in the welding machine during arcing of the welding machine is reduced, the reliability of the integral machine is improved, and the service life of the integral machine is extended.

Description

technical field [0001] The invention relates to the technical field of welding arc striking control, in particular to a welding machine arc striking control circuit. Background technique [0002] Welding machine is an important equipment in the field of production and processing, spanning multiple technical fields such as welding technology, electric arc and power electronics. With the maturity of inverter gas shielded welding power supply technology, due to its small size, light weight and energy saving compared with traditional welding machines, its application range is becoming wider and wider. During the arc ignition process of the inverter welding machine, the entire control loop in the inverter welding machine has a process of establishment from open loop to closed loop. During the establishment process, current overshoot is prone to occur in the control loop, which will cause impact on the power devices of the inverter welding machine, such as switch tubes and rectif...

AI Technical Summary

Problems solved by technology

During the establishment process, the current overshoot phenomenon is prone to occur in the control loop, which will cause impact on the power devices of the inverter welding machine, such as switching tubes, rectifier tubes, etc., and then affect the reliability and life of the whole machine

There is currently no good solution for this

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