Abstract
This paper studies a particular single-stage power-factor-correction (PFC) switching regulator employing a discontinuous-conduction-mode (DCM) boost-input cell and a continuous-current-mode (CCM) forward output cell. Although this single-stage PFC regulator can provide a reasonably high power factor when its PFC stage is operating in discontinuous mode, substantial reduction in line-current harmonics is possible by applying a suitable frequency-modulation scheme. This paper derives a frequency-modulation scheme and proposes a practical implementation using a simple translinear analog circuit. A quantitative analysis on the total harmonics distortion (THD) of the line current when the circuit is subject to a limited range of frequency variation is presented along with some considerations for practical design. Experimental data obtained from a prototype confirms the effectiveness of the proposed frequency-modulation scheme. The proposed analog translinear circuit allows custom integrated circuit (IC) implementation, making it a viable low-cost solution to the elimination of line-current harmonics in switching regulators.
| Original language | English |
|---|---|
| Pages (from-to) | 75-83 |
| Number of pages | 9 |
| Journal | IEEE Transactions on Power Electronics |
| Volume | 13 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1 Dec 1998 |
Keywords
- Control
- Power factor correction
- Switch-mode power supplies
ASJC Scopus subject areas
- Electrical and Electronic Engineering