基于Kent映射的混沌频率调制用于IPOS双有源桥变换器传导共模EMI抑制

With advancements in wide bandgap devices and electromagnetic materials, dual active bridge (DAB) converters are widely used, offering benefits such as increased power density and reduced filter requirements. However, their high frequency can compromise electromagnetic interference (EMI) performance. In this article, we propose a novel Kent mapping-based frequency modulation method to address this issue. It facilitates chaotic variable switching frequency modulation (C-VSFM), effectively suppressing conducted common-mode (CM) EMI in input-parallel-output-series (IPOS) DAB converters. This method reduces noise spikes in the conducted EMI spectrum, easing the demands for EMI filter design. We derive voltage spectra and real-time frequency variation ranges under C-VSFM conditions. Through experimentation, the efficacy of the proposed scheme is verified, which can effectively suppress conducted CM EMI across the test frequency band. Finally, we compare different frequency limits and draw conclusions on reducing conducted EMI effects. This analysis can aid in understanding and mitigating EMI challenges in DAB converters, offering insights for future applications.