Charging Strategy of Integrated Onboard EV Charger with Small Intermediate Capacitor

Shuai You; Zheng Wang; Yuxing Sun

doi:10.17775/CSEEJPES.2021.04700

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Charging Strategy of Integrated Onboard EV Charger with Small Intermediate Capacitor

Regular Papers | 更新时间：2026-10-15

- Charging Strategy of Integrated Onboard EV Charger with Small Intermediate Capacitor
- CSEE Journal of Power and Energy Systems Vol. 11, Issue 4, Pages: 1810-1819(2025)
- 作者机构：
  
  1. School of Electrical Engineering, Southeast University,Nanjing,China
  2. State Grid Jiangsu Maintenance Company,Nanjing,China
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2021.04700
  CLC：
- Published：01 July 2025
- 稿件说明：
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Shuai You, Zheng Wang, Yuxing Sun. Charging Strategy of Integrated Onboard EV Charger with Small Intermediate Capacitor[J]. CSEE Journal of Power and Energy Systems, 2025, 11(4): 1810-1819.
DOI：

Shuai You, Zheng Wang, Yuxing Sun. Charging Strategy of Integrated Onboard EV Charger with Small Intermediate Capacitor[J]. CSEE Journal of Power and Energy Systems, 2025, 11(4): 1810-1819. DOI： 10.17775/CSEEJPES.2021.04700.

摘要

Abstract

The purpose of this paper is to investigate charging strategies for integrated electrolytic capacitorless onboard chargers (OBC) in electric vehicles (EVs). An integrated OBC shares power converters and inductance with the traction system. An electrolytic capacitor is avoided in DC link of this integrated OBC. Thus

volume is reduced and reliability is improved for the power conversion system. In this paper

a charging strategy is proposed for this integrated system with uncontrolled rectification

where active switches are kept off in the power inverter on machine side. Consequently

a virtual DC-link voltage is with a half-wave shape. An extended phase-shift (EPS) operation is proposed for high-frequency DC/DC converters with this charging strategy

respectively. By designing a dedicated modulation and control strategy

sinusoidal charging power and the satisfied grid current are achieved for the system. Both theoretical analysis of operation modes and experimental verification with laboratory prototypes have been presented for the proposed charging strategy.

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