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This work presents detailed analysis of LLC resonant converter to accurately predcit the voltage gain of the converter. Nowadays, Lithium-ion battery cells are mostly preferred for on-board electrical vehicle (EV) battery chargers due to their high power density. This results in wide range output voltage regulation for battery charger. The output voltage regulation of LLC resonant converter is provided by the changing of switching frequency. The conventional first harmonic approximation (FHA) method is usually used for resonant converters and it is not reliable when switching frequency changes in wide range, especiaaly below resonance region. Therefore, the objective of this paper is accurate prediction of the voltage gain characteristic for LLC resonant converter used in EV battery charge applications. The detailed theoretical anlysis of the LLC resonant converter is presented and the presented analysis is compared with a simulation study with 2.7 kW output power and 250 V-450 V output voltage range.

Accurate Prediction of Voltage Gain of the LLC Resonant Converter for EV battery Charge Applications