Title :
Natural commutation method for a low-voltage high-current input DC-DC converter
Author :
Kurio, Nobuhiro ; Ogata, Kiyoshi ; Ohnishi, Tokuo
Author_Institution :
R&D Labs., Nissin Electr. Co., Ltd., Kyoto
Abstract :
This paper presents a high-efficiency isolated boost DC-DC converter with low-voltage high-current input based on a new principle of natural commutation. The proposed circuit comprises interleaved full-bridge DC-AC inverters on primary and parallel-connected bridge-rectifiers on the secondary side of a high-frequency isolation transformer. Commutation between inverters is established by the voltage across series capacitors inserted in the output of DC-AC inverters. Zero-current-switching (ZCS) of the load current is realized through commutation using no resonance operations. The operation principle, characteristics and design method are analyzed and presented herein. The feasibility of the proposed DC-DC converter is verified from its high efficiency of greater than 97% over the wide range of 20-100% of the rated load with input conditions of 25 V, 50 A, and approximate output of 350 V, 1.2 kW.
Keywords :
DC-DC power convertors; rectifiers; zero current switching; boost DC-DC converter; current 50 A; high-frequency isolation transformer; interleaved full-bridge DC-AC inverters; natural commutation method; parallel-connected bridge-rectifiers; power 1.2 kW; voltage 25 V; voltage 350 V; zero-current-switching; Capacitors; DC-DC power converters; Fuel cells; Inverters; RLC circuits; Research and development; Resonance; Switching converters; Voltage; Zero current switching; DC-DC converter; commutation; interleave; soft switching;
Conference_Titel :
Power and Energy Conference, 2008. PECon 2008. IEEE 2nd International
Conference_Location :
Johor Bahru
Print_ISBN :
978-1-4244-2404-7
Electronic_ISBN :
978-1-4244-2405-4
DOI :
10.1109/PECON.2008.4762469