4.8 Article

A Novel Nonisolated GaN-Based Bidirectional DC-DC Converter With High Voltage Gain

Journal

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 69, Issue 9, Pages 9052-9063

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2021.3113015

Keywords

Inductors; Topology; High-voltage techniques; Stress; Clamps; Capacitors; Switches; Gallium nitride; high voltage gain; low voltage stress; switched-capacitor

Funding

  1. Science and Technology Plan of Guangdong Province, China [2017B010112002]

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A nonisolated bidirectional dc-dc converter is proposed for energy storage systems, which has the advantages of simple structure, fewer components, common ground, lower voltage stress, and wide voltage gain range. Compared with conventional buck converters, the novel converter increases the effective duty cycle and reduces voltage stresses across the active switches.
A nonisolated bidirectional dc-dc converter is proposed for energy storage systems in this article. The proposed converter is composed of three active switches, two synchronous rectifiers, two clamping capacitors, and two inductors. The proposed converter has advantages of being a simple structure, a fewer number of components, a common ground, lower voltage stress, and wide voltage gain range. Compared with the conventional buck converters, the novel converter triples the effective duty cycle and lowers voltage stresses across the active switches. A 300-W/500-kHz GaN-based experimental prototype is built and tested to verify the correctness and validity, demonstrating a peak efficiency of 94.54% in step-down mode and a peak efficiency of 94.88% in step-up mode.

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