By Topic

Use of saturable inductor to improve the dimming characteristics of frequency-controlled dimmable electronic ballasts

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Lee, S.T.S. ; Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, China ; Chung, H.S.-H. ; Hui, S.Y.

This work presents an investigation into the use of saturable inductor to improve the dimming characteristics of frequency-controlled dimmable electronic ballasts with a half-bridge series-resonant parallel-loaded inverter. The concept is based on the fact that the effective resonant frequency increases as the inductor current increases, if the unsaturable inductor in the resonant tank circuit is replaced with a saturable one. Susceptibility of the lamp power to the switching frequency variation at low luminous level can be reduced. This can lessen the problem of lamp flickers at dimmed level and result in a wider dimming range and improved controllability. The method gives a simple solution of improving the dimming characteristics without changing the circuit structure. A fundamental frequency model that includes the characteristics of the nonlinear lamp resistance and filament resistance is applied in the analysis. A PSIM simulation model for the saturable inductor is developed. Theoretical predictions are verified with the experimental results of a 36-W T8 prototype.

Published in:

Power Electronics, IEEE Transactions on  (Volume:19 ,  Issue: 6 )