本文分析了两路交错并联双管反激变流器的工作模式，采用开关平均法建立了电流断续模式（DCM）下的变流器小信号模型。
The operation modes of the interleaved double-transistor flyback converter have been analyzed. The DCM small signal AC model using the averaged switch method has been built up.
采用状态空间平均法建立了全桥逆变式弧焊电源主回路的平均状态方程，经过线性化处理推导出频域小信号模型。
The paper introduces the dynamic characteristic and the structure of arc welding power, and gives a method of designing arc welding power which using DSP chip as a controller.
在电路平均法基础上对占空比限制加以改进，并考虑寄生参数的影响，推导出状态方程，建立其小信号模型。
On the base of classic state-space averaging, this paper modifies and considers the parasitic effects of circuit elements which lead to equation of the state, so the small-signal model is established.
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