Using input current shaper in the implementation of high-power-factor electronic ballasts

In this paper a new solution to implement single-stage high-power-factor electronic ballasts based on the input current shaper (ICS) is presented. The ICS is implemented between main rectifier and bulk capacitor to increase the conduction angle of the main rectifier diodes up to a minimum value to obtain low current harmonics injected to the mains. The ICS incorporates only passive elements, avoiding the use of extra control circuitry, thus featuring low cost for the electronic ballast. Both analysis and experimental results are provided in the paper to validate the proposed topology.