Control of Three Port Series Resonant Converter for Hybridizing Different Batteries in Electric Vehicle

The design and control of an isolated three-port series resonant converter (TPSRC) to hybridize metal-air and Li-ion batteries for Electric Vehicle charging applications is proposed in this paper. Metal-air batteries having higher energy density save space, but these are not electrically rechargeable and have lower peak power capacity. On the other hand, Liion batteries can achieve the same at the cost of a bigger size. This paper proposes a control algorithm to integrate these two types of batteries, where metal-air will support the active power during normal operation, and the Li-ion battery will supply power during transient loading and regenerative braking. The design, analysis, and control system design of TPSRC are carried out elaborately in this paper. The presented advanced multivariable decoupling control also reduces the reactive power circulation in the high-frequency links of TPSRC, resulting in lower conduction loss and low peak VA rating of the electrical components. The proposed circuit and control system design is verified in a 48V/48V/400V, 1kW hardware prototype.