Switching Characteristics Optimization of Two-Phase Interleaved Bidirectional DC/DC for Electric Vehicles

Feng Wang,Xiaotong Xu,Hongluo Li,Yutao Luo

doi:10.3390/en12030378

Abstract

In electric vehicles (EVs), bidirectional DC/DC(Bi-DC/DC) is installed between the battery pack and the DC bus to step up the voltage. In the process of mode switching under step signal, the Bi-DC/DC will be affected by a large current inrush which threatens the safety of the circuit. In this paper, a Bi-DC/DC mode switching method based on the optimized Bézier curve is proposed. The Boost and Buck modes can be switched based on the proposed method with fast and non-overshoot switching performance. The experimental results show that the mode switching can be finished in 4 ms without overshoot based on the optimal switching curve.

Highlights

As a key component of electric vehicles (EVs), bidirectional DC/DC (Bi-DC/DC) plays an important role in DC power conversion, allowing current can flow in two directions
Bi-DC/DC with high power and high efficiency is needed in the application of EVs [1,2,3,4,5]
Bézier curve for is proposed, and a prototype is made for switching based on optimal Bézier curve for Bi‐DC/DC is proposed, and a prototype is made for experimental verification

Summary

Introduction

As a key component of electric vehicles (EVs), bidirectional DC/DC (Bi-DC/DC) plays an important role in DC power conversion, allowing current can flow in two directions. Bi-DC/DC with high power and high efficiency is needed in the application of EVs [1,2,3,4,5]. Which has the advantage of low output ripple is widely adopted. Urciuoli et al studied the Bi-DC/DC with interleaved topology and designed a 90 kW prototype which showed a low ripple rate and a high-power density [11]. Thounthong et al developed a Boost DC/DC with two-phase interleaved topology for fuel cells, which has low current ripple [12,13]. Xu et al designed a Bi-DC/DC with two-phase interleaved topology, which has greatly reduced the volume and weight compared to the traditional Bi-DC/DC [14,15]

Methods

Results

Conclusion