Multiple Fluorescent Lamps Research Articles

A Novel Single-Stage High-Power-Factor Electronic Ballast With Boost Topology for Multiple Fluorescent Lamps

A novel single-stage high-power-factor electronic ballast with boost topology for multiple fluorescent lamps is presented in this paper. A high power factor at the input terminal is achieved by operating the boost converter in discontinuous conduction mode. With carefully designed circuit parameters, soft switching on the power switches of the resonant inverter can be retained to attain high circuit efficiency. A prototype electronic ballast designed for four 20 W fluorescent lamps is built and tested to verify the analytical predictions. Satisfactory performance is obtained from the experimental results.

Single-Stage Voltage Source Charge-Pump Electronic Ballast With Switched-Capacitor Dimmer for Multiple Fluorescent Lamps

This paper presents a single-stage electronic ballast for driving multiple fluorescent lamps in which a dimming control scheme is proposed to regulate the lamp current. A laboratory prototype is built and tested, and it is found that the unity power factor can remain under individual lamp brightness control. The experimental results are therefore shown to verify the feasibility of the proposed method.

High-efficiency low-stress electronic dimming ballast for multiple fluorescent lamps

An electronic dimming ballast with a lead-lag tank operation (LLTO) having the properties of high efficiency and low stress is introduced in this paper. The ballast is configured with a voltage-fed half-bridge series-resonant parallel-loaded inverter (SRPLI) acting as a lamp driver. It is loaded with resonant tanks which are designed and operated to be capacitive and inductive to theoretically achieve both zero-voltage switching (ZVS) and zero current switching (ZCS) and to eliminate the reactive current circulating through the switches, resulting in low switching and conduction losses. Moreover, the merit of a successive lamp ignition can be attained with the proposed operation scheme so that current stress imposed on the switches can be reduced. With the plasma model of fluorescent lamps, the analysis, operating principle, and dimming control strategy of the electronic ballast are described in detail. On the other hand, the limitations of the proposed scheme are pointed out. Computer simulation results and experimental measurements are used to verify the theoretical prediction and analytical discussion.

蛍光灯多灯用調光式ICインバータの開発

蛍光灯多灯用調光式ICインバータの開発