Continuous Multi-Scroll Chaotic PWM and its Chaotic Signal Selection Method for EMI Suppression of Power Converters

Abstract

Chaotic pulse width modulation (PWM) technique has been applied to suppress electromagnetic interference (EMI) in power converters. However, traditional discrete chaotic PWM has the shortcoming that the spreading spectrum distribution is triangular in shape and the practical spreading frequency bandwidth is much larger than the designed, which will further result in the limited EMI suppression. In this paper, a continuous chaotic PWM method based on the continuous multi-scroll chaotic attractors is put forward to suppress EMI more effectively, getting better spread spectrum distribution at switching frequency and its multiples for power converters. Moreover, to guide the selection of chaotic signals in real applications, the influence mechanism of multi-scroll chaotic signals on EMI spectrum distribution is firstly analyzed in this paper so as to provide a practical chaotic signal selection method. Finally, the experiments are presented followed by the simulations on a boost converter to verify the effectiveness of the proposed continuous multi-scroll chaotic PWM method and the correctness of the given chaotic signal selection method. This paper provides design guidance for the chaotic PWM in engineering applications. INDEX TERMS Electromagnetic interference, power converters, chaotic pulse width modulation, multiscroll chaotic attractors, spectral characteristics.

A survey of conductive and radiated EMI reduction techniques in power electronics converters across wide‐bandgap devices

“…The comparison of TPWM and chaotic pulse width modulation (CPWM) spectral can be seen in Figure 12 . Yang et al proposed a continuous chaotic PWM method based on continuous multi-scroll chaotic attractors to optimize the design effect [74]. A multi-scroll circuit was realized by cascading an even passive non-linear resistor and an odd passive non-linear resistor through a negative impedance converter.…”

A Chua’s Chaotic Chirp Spread-Spectrum Power Spectral Homogenization Strategy Based on Distribution Transformation

“…The methods reported in the literature for obtaining uniformly distributed chaotic signals [31][32][33][34][35][36][37][38][39] mainly focus on one-dimensional chaotic signals and are not suitable for high-dimensional chaotic signals with higher complexity.…”