The premise of effective feedback control of DC-DC converter to avoid entering the chaotic state is to make a correct judgment on the working behavior of the converter according to the characteristics of the converter output signal and take corresponding control measures. This paper takes the PWM BUCK converter as the research object, analyzes and studies its output signal under different circuit parameters, and proposes and proves that the Fourier des criptor method is used to extract output signals characteristics as the basis for judging the working behavior of the converter. It lays the foundation for realizing intelligent monitoring of the working behavior of the converter by using neural network.
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