A DC-DC converter can give rise to a great variety of behaviors and unstable output signals, depending on the values of the parameters of the circuit. The behaviors can become chaotic from stable work state and the output performance tends to be worse. In this paper, a PWM Buck converter is studied as a research object, the output signals of DC-DC converter in different parameters of the circuit are analyzed. A method of using neural network to identify chaotic behavior of DC-DC converter is put forward. Th...