Super speed inverting square wave composite pulse current pole-changing arc-welding power supply device

Abstract

The present invention discloses a super rapid exchanging method compound pulse current polarity changing arc welding power supply device used for electric arc welding, which comprises a DC power supply, a full bridge transfer circuit, a control system, a drive circuit, a parallel absorbing protecting circuit and a pulse current output circuit. The parallel absorbing protecting circuit is consists of an electrolytic condenser CE, a high frequency capacitance C and a power resistor R. The pulse current output circuit consists of a second follow current inductance LP, a fifth power switch tube TP and a second power diode DP. The DC power supply comprises an assistant DC power supply, a first DC power supply and a second DC power supply. The first DC power supply is used for providing a background current, and the second DC power supply is used for supplying a peak current Tpp, and the control system adopts a DSP processor chip. The current ascension rate of the power supply equipment output polarity changing square wave current of the present invention is not less than 50A / Mus, and the rate of descent is not less than 50A / Mus, and the current ascension rate of the compound pulse is not less than 50A / Mus, and the current ascension rate is 10 to 15 A / Mus, and the frequency of the compound pulse is 1kHz to 30 kHz, and the duty ratio is 10 percent to 90 percent.

Description

technical field [0001] The invention relates to a power supply device suitable for arc welding, more particularly, an ultra-fast conversion square wave compound pulse electrorheological polarity arc welding power supply device, which belongs to the field of modern power electronic inverter technology. Background technique [0002] Variable polarity welding power supply is a new type of welding power supply that replaces sine wave AC and square wave AC power supplies, and is mainly used in tungsten argon arc welding and plasma arc welding. The variable polarity power supply is actually a square wave AC power supply that can be independently adjusted between the current frequency and the positive and negative half-wave current amplitudes and time ratios. Research in recent years has shown that the switching frequency of variable polarity current is one of its important characteristic parameters. The conventional variable polarity welding power supply is restricted by many fac...

AI Technical Summary

Problems solved by technology

The conventional variable polarity welding power supply is restricted by many factors such as the design principle of the power supply hardware circuit. The rising rate and falling rate of the output variable polarity current are about <5A / μs respectively, so it is impossible to realize the higher frequency range of the output variable polarity current. welding

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