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.
Highlights
With the more and more strict requirements on high power density and high reliability, electromagnetic interference (EMI) suppression is becoming a key issue in power converters, especially with the extensive use of wide bandgap semiconductor devices [1]–[4]
Chaotic pulse width modulation (PWM) is to suppress EMI based on modulation technology of power converters, which has the advantages of no increase of external hardware and no increase of the volume, weight, and cost of power converters [8]–[11]
Different chaotic PWMs have been applied to various types of power converters to suppress conducted EMI, such as DC-DC converters, AC-DC converters, motor drive systems, etc., which can effectively reduce the peaks of EMI, and largely reduce the volume and cost of the EMI filters in power converters [12]–[15]
Summary
With the more and more strict requirements on high power density and high reliability, electromagnetic interference (EMI) suppression is becoming a key issue in power converters, especially with the extensive use of wide bandgap semiconductor devices [1]–[4]. Z. Yang et al.: Continuous Multi-Scroll Chaotic PWM and Its Chaotic Signal Selection Method distribution and different effects of EMI suppression. The discrete chaotic mappings are usually used in chaotic PWM as frequency modulated signals, but the chaotic signals generated by the discrete chaotic mappings have a strong jump characteristic, which limits the EMI suppression effect of chaotic PWM for power converters [20]. Chaotic dynamical behaviours of the discrete chaotic mappings are relatively simple and the chaotic signals generated by the discrete chaotic mappings have a strong jump characteristic, which results in a limited effect on EMI suppression and the unwanted spreading frequency bandwidth for power converters. Switches will be formed by comparing modulated wave and chaotic carrier, which means power converters are working under MC-PWM
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