Title :
High-power-factor electronic ballast based on a single power processing stage
Author :
Có, Márcio Almeida ; Simonetti, Domingos S L ; Vieira, José Luiz F
Author_Institution :
Dept. de Engenharia Eletrica, Univ. Federal do Espirito Santo, Vitoria, Brazil
fDate :
8/1/2000 12:00:00 AM
Abstract :
A new high-power-factor (HPF) electronic ballast is introduced in this paper. The proposed topology is based on a single power processing stage, and provides a high-frequency voltage to the fluorescent lamps in addition to presenting an HPF to the utility line. The power processing stage is formed by a half-bridge circuit operating above the resonant frequency, thus providing zero-voltage switching. The self-oscillating technique is employed, which increases the converter reliability with great simplicity. HPF is achieved by using a nonconventional boost stage operating in discontinuous conduction mode, which results in a lower DC-bus voltage than that produced by the conventional boost. Theoretical analysis and experimental results have been obtained for two 40-W fluorescent lamps operating at 40-kHz switching frequency and 220-V line voltage
Keywords :
AC-DC power convertors; bridge circuits; fluorescent lamps; lamp accessories; power factor correction; switching circuits; 220 V; 40 W; 40 kHz; AC/DC converters; converter reliability improvement; discontinuous conduction mode; fluorescent lamps; half-bridge circuit; high-frequency voltage; high-power-factor electronic ballast; lower DC-bus voltage; nonconventional boost stage; power factor correction; power processing stage; self-oscillating technique; switching frequency; zero-voltage switching; Circuit topology; Costs; Discharges; Electronic ballasts; Fluorescent lamps; RLC circuits; Reactive power; Resonance; Resonant frequency; Zero voltage switching;
Journal_Title :
Industrial Electronics, IEEE Transactions on
