Three-Phase LLC Series Resonant DC/DC Converter Using SiC MOSFETs to Realize High-Voltage and High-Frequency Operation

SiC MOSFETs are applied to constitute a three-phase, 5-kW LLC series resonant dc/dc converter with isolation transformers. A switching frequency of around 200 kHz for the transistors successfully reduces the volume of these isolation transformers, whereas insulated-gate bipolar transistors (IGBTs) a...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2016-04, Vol.63 (4), p.2103-2110
Main Authors: Nakakohara, Yusuke, Otake, Hirotaka, Evans, Tristan M., Yoshida, Tomohiko, Tsuruya, Mamoru, Nakahara, Ken
Format: Article
Language:English
Subjects:
Circuit faults
current balancing transformers
LLC resonant converter
MOSFET
Power conversion
SiC MOSFETs
Silicon
Silicon carbide
Switches
three phase
zero current switching (ZCS)
Zero voltage switching
zero voltage switching (ZVS)
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Summary:SiC MOSFETs are applied to constitute a three-phase, 5-kW LLC series resonant dc/dc converter with isolation transformers. A switching frequency of around 200 kHz for the transistors successfully reduces the volume of these isolation transformers, whereas insulated-gate bipolar transistors (IGBTs) are not capable of achieving such a high switching speed. The high-voltage tolerance of SiC MOSFETs, 1200 V, enables increasing the input voltage up to 600 V. High-voltage tolerance, on the other hand, is not compatible with low on-resistance for Si MOSFETs. A three-phase circuit topology is used to achieve up to 5 kW of power capacity for the converter and reduce per-phase current at the same time. Current-balancing transformers among these three phases effectively suppress a maximum peak current from arising in the circuit, a technique that miniaturizes the input and output capacitances. The conversion efficiency of the converter reaches 97.6% at 5-kW operation.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2015.2499721