There are three AC sampling methods commonly used at the signal end of the power system: the zero-crossing method, the adaptive prediction method, and the hardware phase-locked loop. The algorithm principles of the zero-crossing method and the adaptive prediction method are introduced, and the hardware circuit of the phase-locked loop is analyzed, and it is found that they each have their own advantages and disadvantages. The schematic diagram of the phase-locked loop composed of phase-locked devices and the details of the annotation are given to guide related practical activities.
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