An Integrated 1-stage OBC with Power Decoupling for DC charging

This paper proposes a 1-stage integrated On-Board Charger (OBC) capable of DC charging by integrating an Active Power Decoupling (APD) circuit. The 1-stage modular OBC utilizes film capacitors, eliminating electrolytic capacitors, thus offering an expectation of extended lifespan and higher power density. With a reduced number of switching components in its structure, it presents cost advantages. However, in single-phase operation, a 120Hz ripple current exists on the battery side, making DC charging impossible. In previous work, separate APD circuit to enable DC charging during single-phase operation resulted in reduced efficiency due to additional circuit stages, switches, and inductors, consequently increasing both cost and volume. In this paper, we propose a complete 1-stage OBC circuit with integrated APD for enabling DC charging. This approach effectively reduces the number of power stages, switches, and passive components, leading to increased efficiency and a reduction in both cost and volume. To validate the proposed method, a 1-stage OBC with integrated power decoupling prototype was built and achieved DC charging.