电力变换器主电路部（3），其根据该脉冲宽度调制波对 开关元件进行驱动，将直流电压转换为三相交流电压；
A power converter circuit (3) drives a switching device by the pulse-width modulated wave for converting a direct current into the three phase alternating current.
设备中变换器全套部件是串联着的变频器、电压调谐器、脉冲调谐器和放大器。
Said complete set of convertor component in the invented equipment includes the series-connected frequency transformer, voltage tuner, pulse tuner and amplifier.
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