The toroidal core was excited by sharp pulse current. The sensor circuit is composed of peak value detector, Butterworth low-pass filter and differential amplifier.

磁芯采用高频脉冲电流励磁，信号处理电路由峰值检波、低通滤波及差动电路构成。

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The circuit is divided into full bridge module, charge sense amplifier module, correlated double sampling and holding module, closed-loop feedback module, low-pass filter and time controlling module.

检测电路分为全桥平衡模块、电荷放大器模块、信号放大模块、相关双采样模块、采样保持模块、闭环反馈模块、低通滤波模块和数字时序控制模块。

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First, rectified DC voltage are compared with the given value and subtraction, and then obtained voltage control value after get through a low-pass filtering and the error amplifier.

首先将整流直流电压的测量值与给定值进行比较并相减，再经过具有低通滤波功能的误差放大器后得到电压控制量。

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