In fact, the rectified circuit with filter condenser in the direct current side is also the serious pollution source of the harmonics.
而实际上，直流侧含滤波电容的整流电路也是污染严重的谐波源。
The condenser has a control circuit that controls the field excitation to provide voltage control.
调相机带有控制其励磁磁场以提供电压控制的控制电路。
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