... parallel switch 并联开关 parallel switching circuit 并联开关电路 parallel switching relaying system 并联开关继电制 ...
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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.
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。
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