A dual-Mode secondary-side modulated LLC resonant converter for wide output voltage range applications
Abstract
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.
Fields of Study & Subjects
Advanced DC-DC Converters
Wireless Power Transfer Systems
Induction Heating and Inverter Technology
Publication details
- Journal / source
- IEICE Electronics Express
- Volume
- 23
- Issue
- 9
- Pages
- 20250619–20250619
- Publication date
- 12 February 2026
- Language
- EN