基于ST7MC反电势过零检测的电压暂态分析及方案改进

Voltage Transient Analysis and Program Improvement on ST7MC BEMF Zero-crossing Detection

介绍了一种基于ST7MC的反电势过零检测方法。通过对PWM关断期间断电绕组端电压的暂态分析,提出了一种在不同占空比情况下分别对PWM的关断或导通阶段进行采样的改进型反电势过零检测方法。

A BEMF zero-crossing detection method based on ST7MC was introduced in this paper. By the voltage transient analysis of non-energised phase during PWM OFF time, an improved method that sampling in PWM OFF or ON time at different duty cycle was presented.