A Three-in-One Converter for Regular and Emergency Lighting Applications
ABSTRACT This paper presents a three-in-one converter for regular and emergency lighting applications. The converter can function as regular ballast, emergency ballast, and battery charger/discharger, achieving regular and emergency lighting features. The three-in-one converter used in the ballast is an integration of a bidirectional flyback converter and two half-bridge series-resonant parallel-loaded inverters. The derivation and operating principle of the proposed converter are first presented, and an application to regular and emergency lighting is then developed. With the proposed converter and a single-chip microcontroller EM78P458, a low cost multifeature electronic ballast can be readily implemented and installed. Hardware measurements have verified its feasibility and the desired features.
Conference Paper: Push-pull self-oscillating electronic ballast for battery application[Show abstract] [Hide abstract]
ABSTRACT: This paper presents an electronic ballast for battery applications. Low voltage applications including battery, have increased importance, due to emergency illumination applications as well as automotive applications. The ballast uses a push-pull converter, with a self-oscillating command to supply the lamp. Push-pull converter is well suited for battery application, when compared to half-bridge, since it doubles the voltage on the converter operation, while the half-bridge divides it. The self-oscillating circuit is used because of its reliability and simplicity, as well as low cost. In this ballast a 40 W fluorescent lamp and a 24 V battery are used. Design guidelines for the push-pull converter and the self-oscillating circuit are presented. Experimental results show the functionality of the converter as well as it proves it to be a good solution for several battery applications.Industry Applications Conference, 2005. Fourtieth IAS Annual Meeting. Conference Record of the 2005; 11/2005
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ABSTRACT: This paper presents the analysis and design of an isolated single-stage converter achieving high-power-factor correction and fast regulation. By using the technique suggested by Wu et al., a buck-boost converter and a flyback converter can be integrated to form the discussed converter. The buck-boost semistage working in the discontinuous conduction mode (DCM) functions as a power-factor corrector, and the flyback semistage operating in the DCM is a voltage regulator which is controlled, theoretically, to be independent of load variation. An approximated small-signal model of the converter operating in the DCM is developed. Design of a peak-current feedback loop with an optimal proportional integral controller is also presented. A prototype is implemented to verify that the analysis and design are effective and feasibleIEEE Transactions on Industrial Electronics 09/1999; DOI:10.1109/41.778230 · 6.50 Impact Factor
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ABSTRACT: A unified approach to developing single-stage power converters which can fulfil multiple functions is presented. Four synchronous switches corresponding to the four common node types of two active switches are introduced. The approach is then to replace the active switches in multistage converters (in cascade or cascode connection) with one or several of the synchronous switches and their degenerated versions to form a single-stage converter. Illustrations of using these switches to develop single-stage converters are presented. These are started with the development of the well-known single-stage switch-mode converters (SMCs), buck-boost, Cuk, sepic, and Zeta (also named dual sepic), from the basic converters, buck and boost. Then, synthesis and applications of other single-stage converters are addressed. Due to increased component stresses, the developed single-stage converters are primarily suitable for applications with moderate power levelsIEEE Transactions on Aerospace and Electronic Systems 02/1998; DOI:10.1109/7.640279 · 1.39 Impact Factor