High-performance ripple feedback for the buck unity-power-factor rectifier

Author

Lo, Yen-Wu ; King, Roger J.

Author_Institution

Dept. of Electr. Eng., Toledo Univ., OH, USA

fYear

1993

fDate

15-19 Nov 1993

Firstpage

948

Abstract

The buck unity power factor rectifier has harmonic-free input current with complete load regulation down to zero output voltage. A new “nonlinear ripple feedback” is proposed which exactly cancels the spoiling effect of DC-side current ripple on the low-distortion AC line current waveforms, even for large amounts of ripple. This cancellation is independent of operating point and readily implemented with analog hardware, thereby permitting economies in the design of the DC filter while maintaining harmonic-free operation. Both large-signal and incremental analyses of the rectifier are given. Confirming experimental results from a 1 kW 48 V isolated battery charger operating with current-ripple levels ranging from 50 percent to discontinuous-conduction-mode operation are given

Keywords

battery chargers; electric current control; feedback; filters; nonlinear control systems; power factor; power system harmonics; rectifiers; rectifying circuits; 1 kW; 48 V; DC filter; DC-side current ripple; buck rectifier; design; discontinuous conduction mode operation; harmonics; incremental analysis; input current; isolated battery charger; large-signal and incremental analysis; load regulation; low-distortion AC line current waveforms; nonlinear ripple feedback; output voltage; unity power factor; Batteries; Feedback; Filtering; Filters; Galvanizing; Hardware; Inductors; Rectifiers; Signal analysis; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics, Control, and Instrumentation, 1993. Proceedings of the IECON '93., International Conference on

Conference_Location

Maui, HI

Print_ISBN

0-7803-0891-3

Type

conf

DOI

10.1109/IECON.1993.339147

Filename

339147