Design of Off Board Charger with Interleaved Full-Bridge LLC Converter for Electric Vehicle Applications

Electric vehicles are better solution for a greener, noiseless transportation. EVs such as bikes, cars, buses etc. are already seen on the road. As known, the need for higher power ratings, fast charging and low battery discharge are some of the criteria to be satisfied. An interleaved Full-bridge LLC resonant converter for an Off-Board Charger has been proposed in this paper by considering some of the requirements of a modern-day EV such as requirement of high power and fast charging. The control strategy is a combination of Pulse Width Modulation (PWM) and Variable Frequency Technique (VF). This control method assists in maintaining the output voltage within a range of 40V-110V. The model is designed so as to deliver a maximum of 20kW. The topology proposed with the help of the control approach proposed helps in achieving the stability, robustness. It is sensitive to the changes and is flexible enough to adapt to the required output voltages.