T21.8 - Investigation of Electrical Safety for Non-Isolated Single-Phase On-Board Chargers used in BEV/PHEV

Wednesday, March 19, 2025

4:20 PM – 4:40 PM ET

Location: Level Three, A313

Technical Lecture Presenter(s)

Soya Kataoka

Nagoya Institute of Technology

Presentation Paper

Co-Author(s)

Shohei Funatsu (he/him/his)

Nagoya Institute of Technology
Hiroaki Matsumori, PhD

Nagoya Institute of Technology
Tokyo Metropolitan University
Takashi Kosaka, PhD (he/him/his)

Nagoya Institute of Technology
Keisuke Nakamura

Aisin Corporation
Subrata Saha, PhD

Aisin Corporation

This paper proposes a non-isolated single-phase on-board charger (OBC) for use in EV/PHEVs to meet electrical safety which is mainly caused by common mode currents. The non-isolated OBC must not only pass the touch current test (human body impedance voltage drop less than 250 mVrms by UL 2022) but must also prevent the residual current (RCD) device trip (Typical trip current is 6 mA DC and 30 mA AC in IEC 61851) by large ground leakage current due to the low common mode impedance compared to the galvanic isolated OBC. Therefore, the authors proposed a T-type PFC based non-isolated OBC which includes an active power decoupling circuit. The effectiveness of human impedance voltage drop reduction and ground leakage current reduction is verified through suitable experiments. These values are confirmed as under the limit value defined by the relevant standard.