access icon free Hybrid full-bridge converter for DC microgrids: analysis and implementation

This study presents a soft-switching converter for direct current microgrid applications. The studied converter includes n cells of the hybrid full-bridge converter with primary-series–secondary-parallel connection for high-voltage input and large current output applications. Thus, the voltage stress of power switches and the current stress of rectifier diodes are decreased. Therefore, the low-voltage stress and low conduction resistance of power metal–oxide–semiconductor field-effect transistors are utilised in the studied converter to reduce conduction losses on power switches. The flying capacitors are connected between each circuit cell to prevent voltage unbalance on input split capacitors. On each circuit cell, a full-bridge converter with an additional half-bridge circuit is employed to achieve low circulating current losses, less output inductance and a wide range of zero-voltage switching. Finally, the studied converter with 1800 W rated power is constructed and tested to verify the theoretical analysis.

Inspec keywords: switchgear; zero voltage switching; bridge circuits; rectifying circuits; power MOSFET; zero current switching; distributed power generation; power semiconductor diodes; power capacitors

Other keywords: low conduction resistance; half-bridge circuit; flying capacitor; input split capacitor; power metal-oxide-semiconductor field-effect transistor; power 1800 W; conduction loss reduction; low circulating current; rectifier diode; DC microgrid application; primary-series-secondary-parallel connection; power switch; zero-voltage switching; hybrid full-bridge converter; low-voltage stress; current stress; soft-switching converter; direct current microgrid application

Subjects: Switchgear; AC-DC power convertors (rectifiers); Junction and barrier diodes; Insulated gate field effect transistors; Power semiconductor devices; Distributed power generation; Power electronics, supply and supervisory circuits

http://iet.metastore.ingenta.com/content/journals/10.1049/iet-pel.2017.0504
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