A novel low cost two-stage electronic ballast for 250 W high pressure mercury vapor lamps based on current-mode-controlled buck-boost inverter

In this paper, a low-cost electronic ballast for high-pressure mercury vapor (HPMV) lamps is presented. The proposed ballast is a two-stage circuit that requires only one switch and one inductor for each stage. The power factor correction (PFC) stage is a buck DC-to-DC converter operating in discontinuous conduction mode (DCM) to meet with the IEC-1000-3-2 Class C requirements. The inverter stage is a very low cost nonresonant topology, based on a buck-boost inverter controlled by means of a specific current mode control implementation. This control implementation provides an intrinsic short circuit protection and a very simple control circuitry. Also the protection against broken lamp can be easily implemented with the proposed circuitry.

[1]  A.J. Calleja,et al.  Analysis of tapped-inductor inverters as low-power fluorescent lamp ballasts supplied from a very low input voltage , 1999, 30th Annual IEEE Power Electronics Specialists Conference. Record. (Cat. No.99CH36321).

[2]  A.J. Calleja,et al.  Evaluation of a novel single-stage high-power-factor electronic ballast based on integrated buck half-bridge resonant inverter , 2000, APEC 2000. Fifteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.00CH37058).

[3]  A.J. Calleja,et al.  A low cost electronic ballast for a 36 W fluorescent lamp based on current-mode-controlled boost inverter: design example for a greenhouse application with a 120 DC bus power distribution , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).

[4]  H. Endo,et al.  A high-power-factor buck converter , 1992, PESC '92 Record. 23rd Annual IEEE Power Electronics Specialists Conference.