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.
另一种方法，可以增加两个电阻，用一个SPST开关禁止或使能电路。
As an alternative, you can add two resistors and use an SPST switch to disable or enable the circuit.
建立了IGBT电路仿真模型，给出了IGBT功率损耗与开关频率和栅极电阻阻值之间关系的仿真结果。
The circuit model for IGBT simulation is provided. The relationships between IGBT power loss and the switch frequency and between IGBT power loss and grid resistance are presented.
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