A Wide Output Range HB-2LLC Resonant Converter With Hybrid Rectifier for PEV Battery Charging

This paper proposes an HB-2LLC resonant converter with hybrid rectifier to realize wide output voltage control range (100–420 V) for plug-in electric vehicle (PEV), on-board battery charging. The converter has two resonant tanks, each connected with one of the two primary windings of transformer. The two resonant tanks are alternately fed from 400 V dc source by operating two power switches, each with a half switching cycle. The hybrid rectifier connected at the secondary of transformer can be operated as a bridge rectifier or voltage doubler. It operates as a bridge rectifier to achieve output voltage range of 100–250 V for deeply depleted battery charging, and as a voltage doubler to achieve output voltage range of 250–420 V for normal battery charging. To validate the operation and performance of converter, a laboratory prototype rated at 1.5 kW output power and 400 V input dc voltage was designed and implemented. The presented results show that with combined mode changing and frequency control, the converter achieves an output voltage range of 100–420 V. The peak efficiency of converter was measured to be 95.21% at a peak power of 1.5 kW. Thus, the proposed converter is suitable for PEV battery charging application.