Three-Level Resonant Converter With Double Resonant Tanks for High-Input-Voltage Applications

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A new resonant converter having low voltage stress and nearly constant efficiency against line variation for high-and wide-input-voltage applications is presented in this paper. It is similar to a three-level zero-voltage-switching pulsewidth modulation converter (TL ZVS PWMC) with two flying capacitors. In the proposed converter, however, two flying capacitors are used as the resonant capacitors, and the output voltage regulation is achieved by frequency modulation. The main advantages of the proposed converter are that, since the sum of the voltages of two resonant capacitors is constant and is equal to half of the input voltage, the voltage across each switch clamps to half of the input voltage and keeps the balance. Moreover, all main switches and rectifier diodes are softly switched under full-line and full-load conditions, and high efficiency can be constantly achieved over a wide input voltage range. These advantages solve the drawbacks on TL ZVS PWMCs. The features, operation principles, and relevant analysis results over a wide input voltage range of the proposed converter are presented in this paper. The validity of this study is confirmed by the experimental results of a prototype converter with 400-600-V input, 48-V/10-A output, and 200-kHz resonant frequency. The experimental results show that the maximum efficiency of the proposed converter is 95.08% under a full-load and a 600-V input and slightly varies across the 400-600-V input voltage range.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2012-09
Language
English
Article Type
Article
Keywords

DC-DC CONVERTER; ZERO-VOLTAGE; DC/DC CONVERTER; SWITCHES; SCHEME

Citation

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, v.59, no.9, pp.3450 - 3463

ISSN
0278-0046
DOI
10.1109/TIE.2011.2170397
URI
http://hdl.handle.net/10203/101407
Appears in Collection
EE-Journal Papers(저널논문)
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