Welding staring circuit of IGBT inverted gas protective welder

Abstract

The invention relates to a welding staring circuit of an IGBT inverted gas protective welder, which has a structure that a primary coil of a control transformer is connected with an industrial power supply, a secondary coil of the control transformer is serially connected with a primary coil and a first resistor of an isolation transformer, a secondary coil of the isolation transformer is serially connected with a welding gun switch, and two ends of the first resistor are connected with two ends of a second resistor through a rectifier bridge and a filter capacitor; two ends of the second resistor are connected with the input ends of an optical coupler, one of the output ends of the optical coupler is connected with a high level of a power supply, the other output end is grounded through a fourth resistor, and voltage obtained at two ends of the fourth resistor serves as a switching signal of a post-control circuit. The invention has the advantages that the design of the circuit is simple, optimized, safe and reliable; the isolation transformer ensures that the welding gun switch is isolated from the control circuit, thereby preventing high-frequency signal from directly entering into the control circuit; 9V of AC controls the primary side of the optical coupler after rectified and filtered, thereby ensuring that a fore-circuit is isolated from a post-circuit again; and finally the whole service life of the welder is prolonged.

Description

technical field [0001] The invention relates to a starting circuit, in particular to a welding starting circuit of an IGBT inverter type gas shielded welding machine. Background technique [0002] CO 2 Various types of gas shielded welding such as / MAG / MIG / TIG are high-performance, high-efficiency and energy-saving welding methods. 2 Gas and mixed gas and inert gas are welding methods with shielding gas. [0003] The principle is to heat and melt the base metal itself by means of an arc generated between the electrode and the (welding wire) weldment, and then form the weld metal. During the welding process, the electrode, (welding wire) molten pool, arc and the seam area heated by the arc are protected by gas and not polluted by the atmosphere. [0004] The new welding inverter power supply developed with modern power electronics technology has become the most promising metal processing and welding equipment due to its high efficiency, energy saving and excellent control ...

AI Technical Summary

Problems solved by technology

However, since the relay itself controls the on-off state through a mechanical movement, the life of the relay itself is related to the reliability of the control circuit part. Usually, the normal use time of the welding machine using this circuit is not very long.

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