在电路板的设计中采用光电耦合器件、铁氧体磁珠、旁路电容滤波等方式减小了噪声。

At last of design, use optocoupler device, ferrite beads and bypass capacitor to reduce system noise.

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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。

In fact, the rectified circuit with filter condenser in the direct current side is also the serious pollution source of the harmonics.

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并采用寄生电阻预畸变与SC负电阻相结合的办法，设计的SC滤波器对寄生电容不灵敏，且电路简单。

In the process of SC design, an approach combining parasitic resistance pre-mutating and SC negative resistance is followed to achieve a simple filter circuit.

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