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.
该电路具有一个主支路(1)和与该主支路(1)并联的电阻支路(2)。
The electric circuit has a main branch (1) and a resistance branch (2) connected in parallel with the main branch (1).
阻抗函数用分式多项式近似，并表达为串接的并联电阻、电感的福斯特电路形式。
The impedance function is approximated by fractional polynomial, which is represented as a series connection of parallel RL elements (Foster form).
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