Dimming self-oscillating ballast by variable inductor

Abstract

A simple new dimming technique for self-oscillating electronic ballasts based on a variable inductance is introduced. The variable inductor is controlled by DC current. The goal is to keep the resonant condition during dimming without utilising any IC or complex control circuits. Dimming is successfully accomplished and theoretical and experimental results are presented on self-oscillated current fed push pull electronic ballast. © The Institution of Engineering and Technology 2007.