针对目前无功补偿装置中采用的单相过零投切方法存在的缺点，本文提出采用模糊控制的方法。
In order to overcome the disadvantage of the single phase passing zero control in the reactive power compensation device, fuzzy control is put forward in this paper.
该方法以电网电压为同步信号，在电网电压信号的过零点采样直流侧电容电压，并通过周期离散控制可以获得负荷电流有功分量。
The new control way can realize linear control for DC-bus voltage and get the fundamental component of the load current synchronously with a little of calculation.
介绍了反电动势过零位置检测的原理及实现方法，并采用了数字式转速、电流双闭环控制。
One kind of sensorless control system for brushless DC motor based on DSP was introduced and the principle of back-EMF zero-crossing detection and realization method was discussed in detail.
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