Title :
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
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;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2014 Twenty-Ninth Annual IEEE
Conference_Location :
Fort Worth, TX
DOI :
10.1109/APEC.2014.6803532
