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A dual-Mode secondary-side modulated LLC resonant converter for wide output voltage range applications
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DOI：10.1587/elex.23.20250619.png)
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Abstract
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Traditional LLC converters suffer from efficiency degradation and load-dependent voltage regulation when operating off-resonance for wide output ranges. This paper proposes a dual-mode secondary-side modulated LLC topology. The primary side switches between Dual Full-Bridge (DFB) and Dual Half-Bridge (DHB) modes, significantly widening the output voltage range. Simple secondary-side PWM modulation achieves load-independent regulation and maintains ZVS operation at the resonant frequency for high efficiency. A PI-BPNN smooth transition strategy is introduced to mitigate voltage overshoot during mode switching. A 195 V input, 48.75-390 V output prototype validates the converter's advantages and the control strategy's effectiveness.
Keywords:
LLC Converter
wide output voltage range
load-independent voltage gain
zero voltage switching (ZVS) pulse width modulation (PWM)
high-efficiency
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204
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