A wide input voltage and load output variations fixed-frequency ZVS DC/DC LLC resonant converter for high-power applications

Author

Canales, Francisco ; Barbosa, Peter ; Lee, Fred C.

Author_Institution

Bradley Dept. of Electr. & Comput. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA

Volume

4

fYear

2002

fDate

13-18 Oct. 2002

Firstpage

2306

Abstract

This paper presents a fixed-frequency zero-voltage-switching three-level DC/DC resonant converter. By applying phase-shift control between the primary and secondary sides of the transformer, the converter can operate at a fixed switching frequency. The converter can achieve ZVS operation in the entire load range by using the magnetizing inductance of the transformer. In addition, the converter can operate with wide input-voltage variations without penalizing the efficiency. Therefore, the converter is suitable for applications in which high efficiency and high power density are required. The principle of operation for the converter is analyzed and verified on a 2.75 kW, 775 kHz experimental prototype.

Keywords

DC-DC power convertors; inductance; magnetisation; resonant power convertors; switching circuits; 2.75 kW; 775 kHz; ZVS DC/DC LLC resonant converter; fixed switching frequency operation; high efficiency; high power density; high-frequency power conversion; magnetizing inductance; multilevel converters; phase-shift control; soft switching; three-level DC/DC resonant converter; transformer primary side; transformer secondary side; wide input voltage variations; wide load output variations; zero-voltage-switching; Inductance; Load management; Magnetic analysis; Magnetic resonance; Power supplies; Pulse width modulation; Switching converters; Switching frequency; Switching loss; Zero voltage switching;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Conference, 2002. 37th IAS Annual Meeting. Conference Record of the

Conference_Location

Pittsburgh, PA, USA

ISSN

0197-2618

Print_ISBN

0-7803-7420-7

Type

conf

DOI

10.1109/IAS.2002.1042768

Filename

1042768