Hybrid DC Converter with Current Sharing and Low Freewheeling Current Loss

Bor-Ren Lin and Guan-Yi Wu
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Bor-Ren Lin: Department of Electrical Engineering, NYUST (National Yunlin University of Science and Technology), 123, Section 3, University Road, Yunlin 640, Taiwan
Guan-Yi Wu: Department of Electrical Engineering, NYUST (National Yunlin University of Science and Technology), 123, Section 3, University Road, Yunlin 640, Taiwan

Energies, 2020, vol. 13, issue 24, 1-16

Abstract: A new hybrid high-frequency link pulse-width modulation (PWM) converter using voltage balance capacitor and current balance magnetic coupling is proposed to realize low freewheeling current loss and wide load range of soft switching operation. Series-connected H-bridge converter is adopted for high voltage applications. In addition, a voltage balance capacitor and a current balance magnetic coupling core are employed for achieving voltage and current balance. To extend zero-voltage switching (ZVS) range of switches at lagging-leg of phase-shift PWM converter, soft switching LLC converter is linked to the lagging-leg of phase-shift PWM converter. Therefore, the wide ZVS load operation is realized in the presented hybrid converter. The other high freewheeling current disadvantage in conventional phase-shift PWM converter is improved by a snubber circuit used on low-voltage side. Thus, the primary current during the freewheeling state is decreased and close to zero. In addition, the conduction losses on primary-side components of studied converter are reduced. The secondary-sides of phase-shift PWM converter and LLC resonant converter are series-connected to achieve power transfer between input and output sides. Experimental results using a laboratory prototype are provided to demonstrate the effectiveness of the studied circuit and control algorithm.

Keywords: dc/dc converters; soft switching; hybrid converter; PWM (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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