Wide voltage range and low current ripple bidirectional DC/DC converter

ABSTRACT

Along with the prosperous growth of battery energy storage system being applied in renewable energy system, wide voltage range regulation and low current ripple bidirectional DC/DC converters attract much attention of researchers. Based on a basic boost–buck converter and voltage multiplying unit (VMU), this article proposes a two-stage DC/DC converter. The front stage is an input parallel output serial connected boost–buck converter and the back stage contains a dual-coupled inductors VMU. The storage inductors of the front stage aremagnetically coupled with those in back stage. Employing dual coupled inductors VMU can increase voltage gain while not increasing main switch voltage stress during step-up mode, which can widen the application scenarios. During step-down mode, a fully controlled method can obtain a greater step-down voltage ratio. Due to the interleaving control mode of the main switches, the current ripple of the battery side is lower when the converter works bidirectionally. The proposed converter has the advantages of widening voltage range regulation and lowering current ripple while avoiding extreme switch duty cycle. This article discusses theoretical step-up and step-down work mode of the proposed converter. Experimental results sampled from a 12 V/115 V prototype are presented to verify the analysis of the proposed converter.

KEYWORDS:

• Wide voltage regulation
• low ripple
• bidirectional DC-DC
• fully controlled
• coupled inductor

Acknowledgements

From 2009 to 2010, he was a Visiting Student with The University of Western Australia, Perth, Australia. In 2014, he was an Endeavour Research Fellow with the The University of Western Australia. He is currently a Professor with the School of Electrical Engineering, China University of Mining and Technology. He has published two books and over 60 papers in the area of his interests. His research interests include power electronics, power line communication, fault monitoring and diagnosis, nonlinear dynamics and memristive system. (E-mail: [email protected])

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported in part by the National Natural Science Foundation of China under Grant No. 51977208.