transducer,expandor

In this circuit,utilizing the conduction resistance of MOSFET as sampling resistor,the current is amplified by single supply amplifier,then converted to pulse signal by V-F converter,finally the pulse signal is sent to monitor circuit by optocoupler.

文中提出了一款简单的直流电流采样、隔离电路,利用抗浪涌电路(热插拔电路)MOSFET的导通电阻作为采样电阻,经过单电源运放组成的信号放大电路,和555时钟芯片组成的幅-频转换器转变为脉冲信号,通过光耦隔离,送入后级的监控电路。