A variable switching frequency hybrid control for ZVS dual active bridge converters to achieve high efficiency in wide load range

Author

Xiao-Fei He ; Zhiliang Zhang ; Yong-Yong Cai ; Yan-Fei Liu

Author_Institution

Jiangsu Key Lab. of New Energy Generation & Power Conversion, Nanjing Univ. of Aeronaut. & Astronaut., Nanjing, China

fYear

2014

fDate

16-20 March 2014

Firstpage

1095

Lastpage

1099

Abstract

The Dual Active Bridge (DAB) converter with the Conventional Phase-shift Modulation (CPM) and Triangular Current Modulation (TCM) are compared in terms of the power transfer and total loss. It is noted that there exists an optimal design trade off among the switching loss, conduction loss and drive loss according to different load current and switching frequency. Therefore, the optimal switching frequency design would be beneficial to minimize the total loss and improve the performance of the DAB converter. A hybrid modulation strategy with variable switching frequency is proposed to reduce the dominant loss and improve the efficiency in wide load range. A 500 W prototype was built to verity the benefits of the proposed control method.

Keywords

bridge circuits; electric current control; zero voltage switching; DAB converter; ZVS dual active bridge converter; conduction loss; conventional phase-shift modulation; drive loss; load current; optimal switching frequency design; power 500 W; power transfer; switching loss; total loss; triangular current modulation; variable switching frequency hybrid control; wide load range; Control systems; Inductors; Modulation; Power generation; Switching frequency; Switching loss; Zero voltage switching; Dual Active Bridge (DAB); Hybrid control; Variable switching frequency;

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.2014.6803443

Filename

6803443