Title :
A novel valley fill high power factor electronic ballast with dimming feature and low crest factor. Part I. Design and performance
Author :
Lam, John ; Jain, Praveen K.
Author_Institution :
Power Electron. Appl. Res. Lab., Queen´´s Univ., Kingston, Ont.
Abstract :
A novel passive high power factor electronic ballast with dimming feature and low crest factor is presented in this paper. The proposed ballast circuit combines a valley fill circuit and a new frequency modulated current fed resonant inverter as a power circuit. It provides isolation to the driver circuit without the use of any isolation devices. The controller circuit uses a simple modified 555 timer to continuously regulate the lamp current by changing the switching frequency. As a result, a low crest factor is achieved at the output lamp current. All the characteristic equations and design figures are illustrated in this paper. Design guidelines for determining circuit parameters are also provided. MATLAB analysis and Powersim (PSIM) simulation results are presented to highlight the merits of the proposed circuit for a T8-32 W fluorescent lamp
Keywords :
driver circuits; electric current control; fluorescent lamps; frequency modulation; lamp accessories; mathematics computing; power engineering computing; power factor; resonant invertors; 555 timer; MATLAB analysis; Powersim simulation; T8-32 W fluorescent lamp; characteristic equations; current fed resonant inverter; current regulation; dimming; driver circuit; frequency modulation; low crest factor; passive high power factor electronic ballast; power circuit; switching frequency; valley fill circuit; Driver circuits; Electronic ballasts; Equations; Frequency modulation; Guidelines; MATLAB; RLC circuits; Reactive power; Resonant inverters; Switching frequency;
Conference_Titel :
Industrial Electronics Society, 2005. IECON 2005. 31st Annual Conference of IEEE
Conference_Location :
Raleigh, NC
Print_ISBN :
0-7803-9252-3
DOI :
10.1109/IECON.2005.1569008