介绍了一种用于制盐业三相交流电机的电流、电压和温度的智能保护系统的设计与实现。

This paper introduces the design and practice of intelligence protection system for the current, voltage and temperature of three-phrase ac motors.

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最后设计调试了永磁电机直接转矩控制系统，包括IPM驱动和保护电路，电流电压采样电路以及转速采样电路等。

At last, the control system including the drive and protect circuits of the IPM and the current sample circuits and so on are designed.

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其原理包括参考电压电流电路，2.7V及1.8V电压调整电路，过流保护电路以及低压检测电路四个部分。

The schematics includes four parts: bandgap reference voltage and reference current, 2.7V and 1.8V regulator, over-load protection , Low Battery Detection (LBD) .

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