Abstract:
A voltage-quadrupler interleaved bidirectional dc-dc converter with intrinsic equal current sharing is presented in this article. The proposed converter offers a wide vol...Show MoreMetadata
Abstract:
A voltage-quadrupler interleaved bidirectional dc-dc converter with intrinsic equal current sharing is presented in this article. The proposed converter offers a wide voltage conversion ratio, which makes it suitable for interconnecting the energy storage unit with dc bus for electric vehicle applications. A high voltage gain and low voltage stress across switches are achieved by adopting the capacitive voltage-divider stage, which enables the designer to employ a low-voltage switch with a small on-resistance RDS(ON). As a result, it allows the converter to run more efficiently and cooler. An interleaved connection at the low-voltage side paves the way for reducing the current ripple, which reduces the filter size and increases the power-density. Moreover, a built-in equal current sharing is achieved for two interleaved phases without using a current-sharing control scheme. The operating principle, steady-state characteristics including the current and voltage stress of the switches, and comparison with other state-of-the-art bidirectional converters are carried out in detail. Finally, to verify theoretical analysis, a 2-kW scaled-down laboratory prototype of the proposed converter using Gallium-Nitride switches is implemented.
Published in: IEEE Transactions on Industrial Electronics ( Volume: 68, Issue: 2, February 2021)