Embedded system operated digitalization soft switch inversion arc welder

Abstract

The invention relates to a digital soft switch inverter arc welding machine which is controlled by an embedded system. The digital soft switch inverter arc welding machine mainly solves the technical problems of the deficiencies on the control performances and the dynamic response aspect of the traditional welding machine, difficult realization of the real-time control of the welding arc and the improvement of the reliability of an inverter welding machine and so on. A main circuit is controlled by a control circuit to realize the arc welding, the pulse width modulation adopts a soft switch phase-shifting circuit; a pulse drive and protection circuit adopts a drive two magnetic tank type pulse transformer, a capacitor, a twisted-pair line, a TVS tube and a resistor are simultaneously added for continuous protection, thus preventing over-voltage and misconduction of IGBT which is caused by the over-voltage. The digital soft switch inverter arc welding machine is mainly used for various welding.

Description

technical field [0001] The invention relates to a digital soft switch inverter arc welding machine controlled by an embedded system. Background technique [0002] So far, DC welding machines have gone through four stages of development, namely rotary DC arc welding machines, silicon rectifier arc welding machines, thyristor (silicon controlled silicon) DC welding machines and IGBT (insulated gate bipolar transistor) inverter welding machines. , and its advancedness increases successively. Among them, the IGBT inverter welding machine is the main type at this stage. Compared with the thyristor welding machine, its main advantages are: small size, light weight, easy to store and easy to move; fast dynamic response, arc welding Stable, good weld formation; good control performance, easy to realize timely control of the welding process and form an automatic welding system; allow a wide range of grid voltage fluctuations, the main working principle of the IGBT inverter welding ma...

AI Technical Summary

Problems solved by technology

[0004] The traditional hard switching control technology means that when the voltage or current on the switch tube is not zero, the switch tube is forced to be turned on or off. Switching loss is generated in the switch, and the switching loss is proportional to the operating frequency of the switch. In the working converter in the hard switching state, as the frequency rises, on the one hand, the loss of the switching tube will increase significantly, and the efficiency of the converter will be greatly reduced. On the other hand, it will also generate serious electromagnetic interference (EMI)

The defects of hard switching control technology limit the further improvement of the operating frequency of the converter working in the hard switching state, and limit the reduction of the volume and weight of the converter, making it difficult to achieve high integration and miniaturization

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