An improved three-level LCC converter with a novel control strategy for high-frequency high-power-density capacitor-charging power supplies

In this paper, the power factor concept of resonant converters is proposed and analyzed. A novel constant power factor control scheme for high-frequency high-power-density charging applications is proposed and studied. Based on this control scheme, the circulating energy of resonant converters is considerably reduced. Low switching losses are also achieved with very low turn off current. High efficiency can be obtained for high-frequency high-power (several kilowatts) charging applications. A 700 kHz, 10 kV three-level LCC resonant converter is designed to validate the proposed control scheme. The power density of 50W/inch/sup 3/ is achieved with over 88% efficiency at full load.

[1]  Fred C. Lee,et al.  Implementation of optimal trajectory control of series resonant converter , 1987, IEEE Power Electronics Specialists Conference.

[2]  F.C. Lee,et al.  A high-frequency high-efficiency three-level LCC converter for high-voltage charging applications , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[3]  M. Kristiansen.  Pulsed power applications , 1993, Ninth IEEE International Pulsed Power Conference.

[4]  Francisco Venustiano,et al.  Novel DC/DC Converters For High-Power Distributed Power Systems , 2003 .

[5]  R. Elwell,et al.  Current and voltage controlled capacitor charging schemes , 1995 .

[6]  Fred C. Lee,et al.  Analysis of reactive power in resonant converters , 1992, PESC '92 Record. 23rd Annual IEEE Power Electronics Specialists Conference.

[7]  J. Dickens,et al.  Compact, portable pulsed power: physics and applications , 2003, Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472).