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1·In order to ensure A phase and B phase circuits are symmetric, digital potentiometer X9C503 with exterior pressed key in the feedback amplification circuit is designed.

在反馈放大电路设计时，采用数字电位器X9C503与外部按键配合，达到了A、B两相电路的对称性。

2·A closed loop control system is formed by current and Voltage feedback system by means of HALL sensor and potentiometer.

借助输出电压采样和霍尔元件，设计了电流、电压反馈电路，形成了闭环控制系统。