Improved start-up scenario for single-stage electronic ballast

This paper presents improved start-up scenario for single-stage electronic ballast derived with synchronous switch technique (SST), Based on the SST, the derivation of a single-stage inverter (SSI) used for realizing the ball ast is then addressed. The SSI can achieve both high power factor and balla sting function. During lamp start-up transition, power imbalance may exist between the power factor correction semi-stage and the ballast semi-stage, and filament preheating is an important issue. Power imbalance usually resu lts in a high de-link voltage which, in turn, imposes high stress on the sw itching devices. Investigation of the ballast operation is conducted, from which control strategies for reducing component stresses and hot resistance detection circuits for minimizing electrode sputtering are therefore propo sed. Hardware measurements have verified that on-off tests are higher than 18 000 times without significant sputtering.