Application of Wavelet Packet Entropy in Fault Characteristic Analysis of Buck Converter

The inductance current and output voltage information is extracted when the Buck converter under Continuous Conduction Mode and Discontinuous Conduction Mode, the normal information and various fault information are prepossessed by wavelet decomposition, and then decomposed by the 4 layers wavelet packet.Finally, each layer is calculated by the energy entropy. The results show that this method can clearly reflect various fault characteristics of Buck converter, and there is a large difference between normal entropy value and fault entropy value, the appropriate entropy value range can be set as the threshold of fault discrimination to realize the fault diagnosis of Buck converter.