Single-stage Charge-pump Voltage-source Electronic Ballast For A 70 W Hps Lamp

Abstract

In this paper a single-stage charge-pump voltage-source electronic ballast for a 70 W High Pressure Sodium [HPS] lamp is proposed. Although charge-pump ballasts have already been studied in fluorescent lamp applications, for HPS lamps this topology represents a new research topic. The proposed topology is a combination of a double charge-pump and a half-bridge inverter which share the same switches operating complementary. A microprocessor is used to generate the switching frequency, drive the ballast and to supervise and control the power at the lamp. The proposed ballast presents high power factor and energy efficiency, which is improved by the zero-voltage switching technique. Experimental results obtained on a 70 W high-pressure sodium lamp are discussed.

Keywords

• electronic ballast
• high-pressure sodium lamp
• Power Factor Correction - PFC