对外电路而言，在基波频率下有源滤波器被控制为无限大阻抗，在谐波频率下被控制为小电阻。
The active filter acts as an infinite impedance to the external for the fundamental frequency and as a low resistor for harmonic frequencies.
引起开机即烧保险的几个元件分别是滤波电容、消磁电阻、行管等。
Insurance boot that is caused by burning a few components are filtering capacitors, resistors degaussed, such as line pipe.
分析表明，采用合适电容值的低等效寄生电阻的滤波电容，并提高开关频率，可减小输出电压跌落。
The analyses show that using a low equivalent series resistance (ESR) capacitor with a carefully determined value and raising switching frequency can decrease output voltage fall.
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