可控硅逆变式弧焊电源负载过程数学分析

本文以可控硅逆变装置为研究对象，建立了数学模型，分析了理想化电流电压波形，产测波形进行了对照；讨论了可控硅元件容量选择的依据，提出了在考虑可控硅可靠关断时应注意的问题，分析了反压及其维持时间和输出功率的关系，讨论了不形状外特性曲线工作点的工作稳定性差异。

Mathematic analysis of loading process of SCR invertor welding power source

The SCR invertor equipment is researched and its mathematic models are established in this paper. The ideal wave forms of U_f and I_f are analysed and compared with the wave forms in actual test. The choice of SCR capacity is discussed. The problems concerning the stable shutting of SCR are put forth. The relation among the reverse voltage, holding time and out-put power is discussed and the difference in working point stability for different out-put characteristic curves is also studied.