Manual arc welding power supply with arc control function

Abstract

The invention discloses a manual arc welding power supply with an arc control function. The manual arc welding power supply comprises a rectifying circuit, an inverter circuit, a transformer circuit, a secondary rectifying circuit, a control circuit and an arc control circuit; the rectifying circuit, the inverter circuit, the transformer circuit and the secondary rectifying circuit are connected in sequence, the control circuit is connected with the inverter circuit, the conduction time of the inverter circuit is controlled, and thus the output current of the secondary rectifying circuit is controlled; the input of the arc control circuit is connected with the output of the secondary rectifying circuit, the output of the arc control circuit is connected with the control circuit, and the arc control circuit is used for outputting a pulse arc control signal with a constant pulse width to the control circuit according to the output of the secondary rectifying circuit and controlling the conduction time of a power tube in the inverter circuit. When the output of the welding power supply is reduced, the constant pulse signal is output to control the conduction time of the power tube in the inverter circuit, so that the output voltage of the welding power supply is increased, the arc breaking phenomenon is effectively avoided, and the arc breaking phenomenon can be effectively controlled.

Description

technical field [0001] The invention relates to the technical field of inverter welding power supplies, in particular to a manual arc welding power supply with an arc control function. Background technique [0002] At present, the inverter welding power supply first converts the alternating current into direct current through rectification, and then uses the high-frequency IGBT module to convert the direct current into high-frequency alternating current. After the transformer transforms the voltage, it is converted into direct current through secondary rectification. The advantages of fast dynamic response, easy arc starting, stable current, small welding spatter and beautiful weld shape have been widely used. [0003] The power frequency AC power of the power frequency AC power grid is converted into DC power after the rectification circuit. The AC output from the secondary circuit of the transformer is rectified and filtered to become a more stable DC for welding. [000...

AI Technical Summary

Problems solved by technology

[0004] The output welding current of the inverter welding power supply is determined by the control pulse width of the power device in the inverter circuit. PWM with constant pulse width is the basis for welding output stable current, but in order to reduce costs, the main circuit of manual welding current is not designed Output reactor, in this case, due to human factors such as welding techniques, or external factors such as irregular welding base metal, wind, spatter particles, etc., the welding output current will be discontinuous, that is, the inverter welding machine will fail during the welding process. Arc breaking phenomenon; arc breaking phenomenon will have a great impact on special welding power sources with high requirements, and even cause poor welding seam formation and cause the workpiece to become unqualified

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