Showing papers by "J.M. Alonso published in 1999"

Analysis and experimental results of a single-stage high-power-factor electronic ballast based on flyback converter

Abstract: A new single-stage high-power-factor electronic ballast based on a flyback converter is presented in this paper. The ballast is able to supply a fluorescent lamp assuring a high-input power factor for the utility line. Other features are lamp power regulation against line voltage variations and low lamp current crest factor, both assuring long lamp life. The ballast is analyzed at steady-state operation, and design equations and characteristics are obtained. Also, a procedure for the ballast design is presented. Finally, simulation and experimental results from a laboratory prototype are shown.

A novel single-stage constant-wattage high-power-factor electronic ballast

Abstract: A novel single-stage high-power-factor electronic ballast is presented in this paper. The ballast is obtained from the integration of a buck-boost converter and a half-bridge LC resonant inverter. The ballast features lamp power regulation against line voltage fluctuations together with high power factor and dimming capability. The steady-state analysis of the ballast is performed and a low-frequency model of the input stage is derived. A design example, including closed-loop circuitry, is also presented. Finally, some experimental results from a laboratory prototype are shown.

Using input current shaper in the implementation of high-power-factor electronic ballasts

Abstract: In this paper a new solution to implement single-stage high-power-factor electronic ballasts based on the input current shaper (ICS) is presented. The ICS is implemented between main rectifier and bulk capacitor to increase the conduction angle of the main rectifier diodes up to a minimum value to obtain low current harmonics injected to the mains. The ICS incorporates only passive elements, avoiding the use of extra control circuitry, thus featuring low cost for the electronic ballast. Both analysis and experimental results are provided in the paper to validate the proposed topology.

Design and experimental results of an input-current-shaper based electronic ballast

Abstract: This paper presents some design issues and experimental results regarding the use of the input current shaper (ICS) technique to implement high power factor electronic ballasts. The ICS is placed between main rectifier and bulk capacitor to increase the conduction angle of the main rectifier diodes up to a minimum value to obtain low current harmonics injected to the mains. Two possibilities to implement ICS-based ballast are considered in this paper: the forward-based ICS and the flyback-based ICS. Experimental results obtained from two 40 W fluorescent lamp ballasts are also presented.

Investigation of a novel high-power-factor electronic ballast based on the input current shaper

Abstract: This paper investigates the characteristics and features of a novel high input power factor electronic ballast based on the input current shaper (ICS) arrangement. The ICS is implemented between main rectifier and bulk capacitor in order to increase the conduction angle of the main rectifier diodes up to a minimum value to obtain low current harmonics injected to the mains. In this paper, the ICS is implemented using a flyback converter operating in discontinuous conduction mode, and the ballast features both good efficiency and dimming capability. Experimental results from a 40 W fluorescent lamp prototype are presented to evaluate the proposed solution.

Analysis of tapped-inductor inverters as low-power fluorescent lamp ballasts supplied from a very low input voltage

Abstract: In this paper several new one-switch nonresonant topologies able to implement fluorescent lamp ballasts are presented and analyzed. These topologies can be used as ballasts for compact fluorescent lamps (CFLs) supplied from a low DC input voltage. A new design methodology is used, centering the design goal to obtain constant power in the lamp. Design methodology is applied to several inverters including a tapped-inductor in the power topology.

New topologies for low-power and low-input-voltage fluorescent lamp ballasts: tapped-inductor-inverters analysis and design criteria

Abstract: In this paper several new one-switch nonresonant topologies, that can be used in fluorescent lamp ballasts, are presented and analyzed. The proposed topologies include a tapped-inductor in the power topology. They are specially suitable to implement ballasts for low power fluorescent lamps supplied from a low DC input voltage. The design methodology is focused on obtaining constant luminous flux in the lamp, by regulating the power delivered to the lamp against variations in the input voltage and lamp characteristic. Additionally, design criteria to select the right control method and the circuit parameters are provided.