Operation of high-frequency resonant converters on the utility line with improved characteristics

Author

Bhat, Ashoka K S

Author_Institution

Dept. of Electr. & Comput. Eng., Victoria Univ., BC, Canada

Volume

12

Issue

4

fYear

1997

fDate

7/1/1997 12:00:00 AM

Firstpage

623

Lastpage

636

Abstract

Operation and characteristics of Class-D-type resonant converters on the utility line are presented. Two types of resonant converters (LCC- and LCL-type) operating with variable frequency control as well as variable pulse width (fixed frequency) are considered. Analysis and simple design procedures (with design examples) are given. SPICE simulation and experimental results obtained for the designed converters (rated at 250 W) are presented to verify the theory. It is shown that high-line power factor (PF) (>0.95) and line-current total harmonic distortion (THD) of <25% are obtained for the LCC-type converter (with a capacitor ratio of one) for a wide-load range (from full load to 10% rated load) without any active control, and the switch-peak current decreases with the load current. Although the LCL-type converter gives about 20% THD at full load, it increases to about 29% at lighter loads. However, the LCL-type resonant converter can operate in lagging PF mode for the entire line cycle and for a wide-load variation

Keywords

PWM power convertors; SPICE; circuit analysis computing; frequency control; harmonic distortion; power factor; power system harmonics; resonant power convertors; 250 W; Class-D-type resonant converters operation; LCC-type resonant converter; LCL-type resonant converter; SPICE simulation; high-frequency resonant converters; high-line THD; high-line power factor; lagging PF mode; line-current total harmonic distortion; switch-peak current decrease; utility line; variable frequency control; variable pulse width; wide-load variation; Capacitors; DC-DC power converters; Frequency conversion; Hafnium; Reactive power; Resonance; Switching converters; Switching frequency; Total harmonic distortion; Voltage;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/63.602557

Filename

602557