A novel approach to design EV battery chargers using SEPIC PFC stage and optimal operating point tracking technique for LLC converter

Author

Haoyu Wang ; Dusmez, Serkan ; Khaligh, Alireza

Author_Institution

Electr. & Comput. Eng. Dept., Univ. of Maryland, College Park, MD, USA

fYear

2014

fDate

16-20 March 2014

Firstpage

1683

Lastpage

1689

Abstract

In this paper, a plug-in electric vehicle battery charger is proposed based on SEPIC PFC and LLC topologies. In addition, a new approach in introduced to actively control the dc link voltage and track the maximum efficiency point of a LLC converter over the wide voltage range of the high voltage battery pack. Comprehensive circuit modeling and loss analysis at maximum efficiency point of LLC converter are carried out. A 3.3 kW charger, charging the Li-ion battery with an output voltage range of 100 V to 420 V from variable dc link voltage, is designed and simulated. In comparison to conventional approaches, the LLC stage demonstrates 4.4% efficiency improvement at the heaviest load condition and 16.5% efficiency improvement in the lightest load condition.

Keywords

battery chargers; electric vehicles; power factor correction; secondary cells; voltage control; EV battery chargers; LLC converter; SEPIC PFC stage; dc link voltage control; loss analysis; maximum efficiency point tracking; optimal operating point tracking; plug-in electric vehicle battery charger; power 3.3 kW; secondary battery; voltage 100 V to 420 V; Batteries; Bridge circuits; Core loss; Resonant frequency; Topology; Voltage control; Zero voltage switching;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition (APEC), 2014 Twenty-Ninth Annual IEEE

Conference_Location

Fort Worth, TX

Type

conf

DOI

10.1109/APEC.2014.6803532

Filename

6803532