Multiport Interleaved Resonant DC-DC Converter for Off-Board Electric Vehicle Charging Application

The electric vehicles (EVs) are occupying the transportation sector at pace and it is expected to surpass the fuel-based vehicle in the upcoming decade. One of the major hurdles for EV is the requirement for multiple fast charging stations to meet the demand of charging of the EV. Thus arises the requirement for fast chargers that could satisfy the demand for better mileage and shorter span of charging. The proposed article is on multiport output series resonant interleaved DC-DC converter with unidirectional power flow capability of different ports with particular voltage level. Having a multiport structure reduces the requirements of components resulting the cost and volume of the system decreases in comparison with the same number of individual chargers. A control method using pulse width modulation and frequency modulation is obtained to control the output voltage and power for the three port converters. The interleaved output of the three ports helps to obtain low ripple peak current for high frequency (HF) transformer secondary side and high charging current obtained. A 3.3kW three-port output interleaved DC-DC converter has been designed and simulated in MATLAB simulation software for variable input voltage and ZVS soft-switching is achieved for wide range of input voltage.