Hybrid Modulation Strategy for Dual Active Bridge LLC Resonant Converter

The dual active bridge LLC resonant converter as an isolated DC-DC converter has garnered growing interest due to the increasing demand for residential energy storage solutions. To reduce the switching frequency variation range, a hybrid modulation strategy combining frequency modulation (FM) with phase-shift modulation (PSM) is introduced. Compared with conventional frequency modulation strategy, the dual active bridge LLC resonant converter achieves the same gain range with this hybrid modulation over a narrower switching frequency range.