Improved Circuit for Compact Fluorescent Light Bulbs

Many governments have mandated that conventional incandescent light bulbs be phased out and replaced with fluorescent light bulbs (CFLs) to conserve energy and reduce cost.  However, in dimming applications, incandescent are still preferable to CFLs due to superior performance and compatibility with standard dimmer switches.  The circuit developed by the proposed research will allow consumers to experience the same dimming performance with CFLs as with incandescent, with no change to existing lighting wiring and dimming hardware.  The proposed circuit is highly efficient, cost effective and compact, and also improves the poor power factor performance of CFLs currently available.  By achieving high input power factor throughout the whole dimming range, power drawn from the grid is fully converted into useable power, improving power conversion efficiency from grid to lamp.  Industrial partner Cistel will benefit from development of a highly marketable technology that will help Ontario meet its energy conservation goals.

Faculty Supervisor:

Dr. Praveen Jain


John Lam


Cistel Technology Inc.


Engineering - computer / electrical




Queen's University



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