A New Control Method for a Bi-Directional Phase-Shift-Controlled DC-DC Converter with an Extended Load Range
1
Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
2
Hong Kong Branch of National Rail Transit Electrification and Automation Engineering Technology Research Center, Hong Kong, China
*
Author to whom correspondence should be addressed.
Energies 2017, 10(10), 1532; https://doi.org/10.3390/en10101532
Received: 21 July 2017 / Revised: 29 September 2017 / Accepted: 29 September 2017 / Published: 10 October 2017
(This article belongs to the Special Issue Emerging Power Electronics Technologies for Power Systems and Machine Drives)
Phase-shifted converters are practically important to provide high conversion efficiencies through soft-switching techniques. However, the limitation on a resonant inductor current in the converters often leads to a non-fulfillment of the requirement of minimum load current. This paper presents a new power electronics control technique to enable the dual features of bi-directional power flow and an extended load range for soft-switching in phase-shift-controlled DC-DC converters. The proposed technique utilizes two identical full bridge converters and inverters in conjunction with a new control logic for gate-driving signals to facilitate both Zero Current Switching (ZCS) and Zero Voltage Switching (ZVS) in a single phase-shift-controlled DC-DC converter. The additional ZCS is designed for light load conditions at which the minimum load current cannot be attained. The bi-directional phase-shift-controlled DC-DC converter can implement the function of synchronous rectification. Its fast dynamic response allows for quick energy recovery during the regenerative braking of traction systems in electrified trains.
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Keywords:
phase-shift-controlled converters; zero voltage switching; zero current switching; light load condition; load range
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MDPI and ACS Style
Xu, W.; Chan, N.H.L.; Or, S.W.; Ho, S.L.; Chan, K.W. A New Control Method for a Bi-Directional Phase-Shift-Controlled DC-DC Converter with an Extended Load Range. Energies 2017, 10, 1532.
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