Proposed magnetic integration techniques for two-stage high power factor dimmable electronic ballasts

Abstract

This paper proposes the magnetic integration techniques for two-stage high power factor dimmable electronic ballasts. To confirm that the proposed magnetic integration circuits do not degrade the normal operating performances in terms of noise reduction performances and power factor improvements, three prototypes are implemented and tested with the same designing conditions. From the experimental results, it can be concluded that the electronic ballast with integrated magnetic cores of a buck inductor and a resonant inductor using single set of “EI” magnetic core, where a CM choke uses separate single “EI” magnetic core, provides a good agreement in terms of noise reduction performances and power factor improvements comparing with that of the conventional electronic ballast where all magnetic components use three sets of “EI” magnetic cores separately. Thus, by comparing between the proposed circuit and traditional one, it can be seen that one set of “EI” magnetic core can be eliminated without any degradations of the operating performances. © 2018 Praise Worthy Prize S.r.l.-All rights reserved.