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EDGE　PROCESS　ON　ARC　WELDING　INVERTER　COMMUTATING

Chinese Journal of Mechanical Engineering 1997年第2期10卷 106-111,147页

作者： Li Zhongyou, Jao JudongShandong University of Technology, South China University of Technology

Half-bridge circuit is taken as example, the physical essential of current pulse front edge and back edge in PWM of PFM converter is analyzed. The appearance of varying current-source or transfor- mation from voltage-source into current-source in primary of converter is necessary condition for forming front and back edges. Through synchrenously varying of primary current and secondary current , and current shifting between two secondary windings in constant magnetic condition, transformation of basic Stages is realized.

关键词： Welding ,Inverter Pulse edge Constant magnetic current shifting

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Principle　analysis　and　electromagnetic　design　of　half－bridge　commutating　circuit　for　thyristor　arc　welding　inverter

引用

China Welding 1996年第1期5卷 10-21页

作者： LI Zhongyou LI Qiaomin YANG Min LI Qingbin and YANG Youli(Welding Department. Shandong University of Technology. Ji’nan. 250014) Welding Department Shandong University of Technology Ji'nan 250014 ***

A novel theory of the commutating process of half/bridge thyristor are welding inverter is presented. According to the characteristic of its typical primary current pulse, a commutating process can be divided into three stages. ie.. front-edge wave-head stage and back-edge *** equivalent circuits of each stage are presented respectively. For wave-head stage, the differential equation about the voltage across commutating capacitor has been set up with the initial condition of nonzero-current and nonzero-voltage. and its solutions are completely in accord with the practically measured waveforms. For front and back edge stages, the theory of current shifting on constant magnetic condition is introduced. The process, in which the inverse voltage across commutating capacitor is formed, and the rule, according to which the inverse voltage *** discussed. In addition. each. special operating state is studied carefully and a reasonable design state is determined. By T-type equivalent circuit in the design. state. the fundamental formulas for accurate engineering design are derived. Finally. two design cases are given.

关键词： RLCU equivalent circuit current shifting inverse voltage forming design State

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