Title :
A new proposal of switched power oscillator with soft-commutation applied as a HPF electronic ballast
Author :
Gomes de Freitas, Luiz Carlos ; Coelho, E.E.A. ; Vierira, J.B., Jr. ; Simoes, M.G. ; De Freitas, L. C Gomes
Author_Institution :
Faculdade de Engenharia Eletrica, Univ. Fed. de Uberlandia, Brazil
Abstract :
A new switched power oscillator with reduced conduction losses, zero voltage and zero current turning on, and zero voltage turning off, is presented in this paper. The proposed topology consists on a buck plus boost converter operating in continuous conduction mode (CCM) associated to a self-oscillating LC series resonant circuit. This new power oscillator can be applied as an electronic ballast for fluorescent lamps as well as self-oscillating auxiliary medium open loop power supply. Circuit description and experimental results of the proposed HPF electronic ballast with low THDI (7.3%), high PP (99.73%), and crest factor equal to 1.4 are presented. A high power factor electronic ballast prototype switching at 40 kHz for a 40 W fluorescent lamp has been built and analyzed experimentally and by simulation.
Keywords :
DC-DC power convertors; fluorescent lamps; harmonic distortion; lamp accessories; oscillators; power conversion harmonics; resonant power convertors; switching convertors; 40 W; 40 kHz; CCM; HPF electronic ballast; THD; buck plus boost converter; conduction loss reduction; continuous conduction mode; crest factor; electronic ballast; fluorescent lamp; open loop power supply; self-oscillating LC series resonant circuit; switched power oscillator; Circuit topology; Electronic ballasts; Fluorescent lamps; Power supplies; Proposals; RLC circuits; Reactive power; Turning; Voltage-controlled oscillators; Zero voltage switching;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2004. APEC '04. Nineteenth Annual IEEE
Print_ISBN :
0-7803-8269-2
DOI :
10.1109/APEC.2004.1295801
