Accuracy-Enhanced Simplified Time-Domain Analysis for Inner Phase-Shift Control in CLLC Converter

Le résumé fourni par la source

The CLLC converter is widely utilized in applications requiring bidirectional power flow. While pulse frequency modulation (PFM) has traditionally been employed to control CLLC converter, it fails to adequately regulate voltage under high-frequency operation and light load. Inner phase-shift modulation (IPSM) offers a promising alternative by modulating the angle of primary-side switches to achieve a wide output voltage range and full load operation. However, IPSM faces challenges in calculating phase-shift range, implementing soft-switching, and achieving synchronous rectification. This paper introduces an accuracy-enhanced simplified time-domain analysis (STDA) method to accurately analyze IPSM. Through accurate descriptions of modal waveforms and multi-condition calculations, the method derived time-domain expressions that enhance accuracy, allowing for an accurate fit to ideal waveforms, softswitching conditions, and phase-shift ranges. More detailed lowerror synchronous-rectification (SR) timings are precisely derived. Experimental verification using a 1.5-kW CLLC converter confirms that the proposed method aligns with theoretical calculations. The operating efficiency is shown to improve by 0.70%–1.05% with accurate synchronous rectification at light load.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.