Title :
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
fDate :
3/1/1995 12:00:00 AM
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% to discontinuous-conduction-mode operation are given
Keywords :
AC-DC power convertors; circuit testing; control system analysis; control system synthesis; feedback; load regulation; network analysis; network synthesis; nonlinear control systems; power factor; power system harmonics; rectifiers; rectifying circuits; voltage control; 1 kW; 48 V; DC-side current ripple; buck rectifier; discontinuous-conduction-mode operation; harmonic-free input current; incremental analysis; isolated battery charger; large-signal analysis; load regulation; low-distortion AC line current waveforms; nonlinear ripple feedback; performance; spoiling effect; test results; unity power factor; zero output voltage; Batteries; Feedback; Filters; Frequency; Galvanizing; Inductors; Pulse width modulation; Rectifiers; Resonance; Voltage;
Journal_Title :
Power Electronics, IEEE Transactions on
