The influence of impulse current waveform on 50 Hz continuous current of switching type surge protective device(SPD) was studied.
研究了冲击电流波形对开关型电涌保护器（SPD）的工频续流的影响。
The final analysis proved that a phase-shifting surge SPWM optimal control of the inverter, a simple control circuit, in the phase shift smaller, better quality waveform.
最后分析证明了采用移相调压最优SPWM控制的逆变器，控制电路简单，在移相角较小时，波形质量较好。
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