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http://dx.doi.org/10.6113/JPE.2014.14.3.468

Optimized Design of Bi-Directional Dual Active Bridge Converter for Low-Voltage Battery Charger  

Jeong, Dong-Keun (Department of Electrical Engineering, Pusan National University)
Ryu, Myung-Hyo (Power Conversion and Control Research Center, HVDC Research Division, KERI)
Kim, Heung-Geun (Department of Electrical Engineering, Kyungpook National University)
Kim, Hee-Je (Department of Electrical Engineering, Pusan National University)
Publication Information
Journal of Power Electronics / v.14, no.3, 2014 , pp. 468-477 More about this Journal
Abstract
This study proposes an optimized design of a dual active bridge converter for a low-voltage charger in a military uninterrupted power supply (UPS) system. The dual active bridge converter is among various bi-directional DC/DC converters that possess a high-efficiency isolated bi-directional converter. In the general design, the zero-voltage switching(ZVS) region is reduced when the battery voltage is high. By contrast, efficiency is low because of high conduction losses when the battery voltage is low. Variable switching frequency is applied to increase the ZVS region and the power conversion efficiency, depending on battery voltage changes. At the same duty, the same power is obtained regardless of the battery voltage using the variable switching frequency. The proposed method is applied to a 5 kW prototype dual active bridge converter, and the experimental results are analyzed and verified.
Keywords
Bi-directional control algorithm; Dual active bridge (DAB) converter; Soft switching (ZVS); Variable switching frequency;
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