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Energies 2016, 9(7), 501; doi:10.3390/en9070501

Analysis and Controller Design of a Universal Bidirectional DC-DC Converter

1
National Synchrotron Radiation Research Center, No. 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30077, Taiwan
2
Department of Electrical Engineering, National Taiwan University of Science and Technology, EE-105-1 #No.43, Sec. 4, Keelung Rd., Da’an Dist., Taipei 10600, Taiwan
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Ali M. Bazzi
Received: 29 April 2016 / Revised: 13 June 2016 / Accepted: 24 June 2016 / Published: 29 June 2016
(This article belongs to the Special Issue Power Electronics Optimal Design and Control)

Abstract

In this paper, first the operating principles of a non-isolated universal bidirectional DC-DC converter are studied and analyzed. The presented power converter is capable of operating in all power transferring directions in buck/boost modes. Zero voltage switching can be achieved for all the power switches through proper modulation strategy design, therefore, the presented converter can achieve high efficiency. To further improve the efficiency, the relationship between the phase-shift angle and the overall system efficiency is analyzed in detail, an adaptive phase-shift (APS) control method which determines the phase-shift value between gating signals according to the load level is then proposed. As the modulation strategy is a software-based solution, there is no requirement for additional circuits, therefore, it can be implemented easily and instability and noise susceptibility problems can be reduced. To validate the correctness and the effectiveness of the proposed method, a 300 W prototyping circuit is implemented and tested. A low cost dsPIC33FJ16GS502 digital signal controller is adopted in this paper to realize the power flow control, DC-bus voltage regulation and APS control. According to the experimental results, a 12.2% efficiency improvement at light load and 4.0% efficiency improvement at half load can be achieved. View Full-Text
Keywords: bidirectional buck–boost DC-DC converter; zero voltage switching; adaptive phase-shift control bidirectional buck–boost DC-DC converter; zero voltage switching; adaptive phase-shift control
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Liu, K.-B.; Liu, C.-Y.; Liu, Y.-H.; Chien, Y.-C.; Wang, B.-S.; Wong, Y.-S. Analysis and Controller Design of a Universal Bidirectional DC-DC Converter. Energies 2016, 9, 501.

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