A duty ratio measuring circuit, which using differential voltage amplifier as core component, was designed utilizing the relationship between the duty ratio and the compensatory terminal of PWM IC.

介绍一种利用占空比与PWM电路补偿端电压之间的关系，设计的以差动电压放大器为核心构成的占空比测量电路；它能以数字显示形式直接给出脉冲电源输出电压的占空比。

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