Abstract
For electric vehicle (EV) onboard charging, high efficiency and power density of the charger is required. Soft switching technique is an effective way to increase On-Board Charger (OBC) power density and efficiency. This paper presents a fixed frequency zero-voltage-switching OBC topology which can realize Zero-Voltage-Switching (ZVS) of all the power semiconductor devices. An auxiliary resonant branch is used to realize Zero-Voltage-Switching for both front-end full-bridge rectifier and phase-shift full-bridge dc-dc converter. A novel PWM scheme is proposed for the OBC topology. ZVS conditions are derived. Finally, the proposed OBC is verified by the experiment.
Highlights
For electric vehicle (EV) onboard charging, high power density of the charger is required
In order to raise the efficiency of the On-Board Charger (OBC), SiC and GaN power devices are applied in the OBC to reduce the power device loss and raise the switching frequency [2,3,4,5,6,7,8]
Two stages OBC is widely applied, which is composed of a power factor correction (PFC) unit and an isolated dc-dc converter unit
Summary
The lightweight, compact, efficient on-board charger (OBC) is critical for electric vehicles[1]. The soft switching topologies are applied in OBC to further increase efficiency and power density [4,5,6,7,8]. Traditional topologies such as boost PFC, bridgeless boost PFC and totem-pole PFC are applied in the PFC unit of OBC, which operate in hard switching mode It results in lower efficiency and lower power density. Wide output voltage range will lead to a large range of operating switching frequency, which causes excessively high working magnetic density of the transformer at low frequency, the magnetic loss of the transformer will be increased. This paper proposes a novel fixed frequency ZVS OBC topology that all power devices can achieve zero-voltage turn-on.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
