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Zero-voltage-switching multi-resonant three-level converters | IEEE Conference Publication | IEEE Xplore

Zero-voltage-switching multi-resonant three-level converters


Abstract:

This paper proposes a new family of zero-voltage-switching multi-resonant three-level converters (ZVS-MR-TLCs), which is derived by introducing a LCC multi-resonant netwo...Show More

Abstract:

This paper proposes a new family of zero-voltage-switching multi-resonant three-level converters (ZVS-MR-TLCs), which is derived by introducing a LCC multi-resonant network to the basic three-level converters. The unique arrangement of a multi-resonant network results in absorption of all major parasitic components in the resonant circuit, including switch output capacitor, diode junction capacitor and transformer leakage inductor. Compared with the traditional multi-resonant converters (MRCs), which is a two-level converter, the proposed converters achieve ZVS in a wider load range, reduce the voltage stress on the switches and diodes, and the filter can be reduced significantly. Buck ZVS-MR-TLC is taken as the example to illustrate the operation principle, characteristics and the advantages over the buck ZVS-MRC. A 1 kW prototype converter is built in our lab to verify the theoretical analysis.
Date of Conference: 20-25 June 2004
Date Added to IEEE Xplore: 15 November 2004
Print ISBN:0-7803-8399-0
Print ISSN: 0275-9306
Conference Location: Aachen, Germany

I. Introduction

The main advantage of three-level converter (TLC) is that the voltage stress on switches is only the half of the input voltage, so TLC is very suited for high voltage and high power DC-to-DC conversion [1]. [2] analyzed the derivation of TLC, and extended the derivation to all the dc-dc converters, and proposed a family of TLCs, including Buck, Boost, Buck-Boost, Cuk, Sepic, Zeta, Forward, Flyback, Push-Pull (PP), Half-Bridge (HB), Hybird Full-Bridge (H-FB) and Full-Bridge (FB) TLCs. [3] introduced the concept of blocking capacitor and modified the six non-isolated TLCs to make the output share ground with the input, among which the Buck TLC and Boost TLC are the same as the converters proposed in [4]. The blocking capacitor is essentially the same as the flying capacitor popularly called in three-level and multi-level converters. So hereinafter we rename the blocking capacitor as flying capacitor.

References

References is not available for this document.