主电路开关频率恒定，容易实现。
The main circuit switching frequency is constant, which is desirable for industrial applications.
主电路以反并联的晶闸管作为控制开关，控制焊接用的电阻点焊变压器通电与否。
In the main circuit, the inverse parallel couple SCRs (silicon-controlled rectifier) are used as a electric switch, switching the transformer of resistance spot welding.
分析了一种带交流谐振环节软开关谐波补偿器的主电路拓扑。
A topology of the main circuit for the harmonic compensator with a resonant AC link soft-switching is analyzed.
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