A high power factor flyback-half-bridge converter for fluorescent lighting

• Published in: IECON '98. Proceedings of the 24th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.98CH36200) Vol. 2; pp. 935 - 940 vol.2
• Main Authors: do Prado, R.N., Bonalso, S.A., Greff, D.S.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 1998
• Subjects: Arthritis; Circuit topology; Diodes; Electronic ballasts; Filters; Fluorescence; Fluorescent lamps; Frequency conversion; Reactive power; Voltage
• ISBN: 0780345037; 9780780345034
• DOI: 10.1109/IECON.1998.724219

This paper presents the analysis, design and practical considerations of a high power factor electronic ballast for fluorescent lamps. The proposed topology is the combination of a flyback converter and a half-bridge series-resonant parallel-loaded inverter. The high power factor is guaranteed by the use of a flyback converter operating in discontinuous-conduction mode. The high-frequency supply of the lamp is given by the half-bridge converter. The self-oscillating technique is employed, which increases the converter reliability with great simplicity and low cost. In spite of it simplicity, a high performance concerning load and supply is achieved, ensuring a sinusoidal and in-phase supply current.