Invention Grant
US09405261B2 Method and apparatus for detecting phase of input power 有权
用于检测输入功率相位的方法和装置

Method and apparatus for detecting phase of input power
Abstract:
A phase detector includes an alternating current input unit to which input power is applied; a zero cross generator that outputs a zero cross signal at a zero cross point of the input power by using a photo coupler; and a zero cross detector that converts the zero cross signal to a pulse signal and detects the phase of the input power based on the pulse signal. A compensation capacitor is connected in parallel at a first side of the photo coupler.
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