Abstract
CLLC resonant converter normally faces light-load problems of unsatisfying voltage regulation and efficiency. This paper presents a novel asymmetric pulse width modulation (APWM) control scheme to improve the voltage regulation ability and efficiency of full-bridge CLLC resonant converter. In this control scheme, the proposed APWM method is utilized to reach the desired voltage gain lower than unity at resonant frequency with soft switching of all switches in light-load conditions, and the pulse frequency modulation (PFM) is combined to realize the voltage gain higher than unity. In comparison with traditional PFM, the proposed control scheme effectively regulates the output voltage and achieves satisfactory efficiency over entire load conditions. This control scheme is verified by experiments on a 21.5V/380V and 200W GaN based full bridge CLLC converter prototype, proving desirable voltage gain and favorable efficiency from light-load to full-load conditions.
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