Abstract
A new dual-output LLC resonant converter is presented for high power density and high efficiency dual-output application. A new control freedom is provided by replacing two diodes in the secondary-side rectifier with two MOSFETs. Variable frequency modulation plus secondary side phase-shift modulation scheme is adopted to realize precise regulation of both the two outputs simultaneously. Meanwhile, zero-voltage switching and zero-current switching can be ensured for all the MOSFETs and diodes, respectively, to reduce switching losses. The operational principles, characteristics, control strategies, and design considerations are analyzed in detail. Experimental results with a 420W-rated dual-output prototype are provided to verify the effectiveness and advantages of the presented converter.
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