Design and implementation of a high-efficiency bidirectional DC-DC Converter for DC micro-grid system applications

作者：Chiu Huang Jen^*; Lo Yu Kang; Kuo Shu Wei; Cheng Shih Jen; Lin Feng Tsuen

来源：International Journal of Circuit Theory and Applications, 2014, 42(11): 1139-1153.

DOI：10.1002/cta.1910

• bidirectional DC-DC converter
• micro-grid system
• zero-voltage-switching
• adaptive phase-shift control
• three-stage charging
• E-CAN communication

This paper studies the design and implementation of a non-isolated dual-half-bridge bidirectional DC-DC converter for DC micro-grid system applications. High efficiency can be achieved under wide-range load variations by the zero-voltage-switching features and an adaptive phase-shift control method. A three-stage charging scheme is designed to meet the fast-charging demand and prolong the lifetime of LiFePO4 batteries. A digital-signal-processing control IC is used to realize the power flow control, DC-bus voltage regulation, and battery charging/discharging of the studied bidirectional DC-DC converter. Finally, a 10kW prototype converter with Enhanced Controller Area Network communication function is built and tested for micro-grid system applications. A light-load efficiency over 96% and a rated-load efficiency over 98% can be achieved.

• 出版日期2014-11