SUMMARYIn this paper, we study the feasibility of a single-stage lighting LED lamp driver with low DC bus voltage. The operating principles and design considerations for the LED lamp driver in this study are analyzed and discussed in detail. A laboratory prototype has been built and tested. Using the prototype, high efficiency, high-power factor and LED current control were achieved using a wide AC input voltage range from 90 to 270 V.

This paper presents a multiple-input DC/DC converter for renewable energy systems. The proposed DC/DC converter can be used to obtain well-regulated output voltage from several power sources, such as wind turbines, photovoltaic arrays, fuel cells, etc. The energy provided by these power sources can be simultaneously transferred into the load. The proposed multiple-input DC/DC converter has the advantages of simple configuration, fewer components, lower cost and high efficiency. The operating principle, theoretical analysis, and design criteria are provided in this paper. A laboratory prototype with two different power sources was successfully implemented and tested. The simulation and experimental results are given to verify the feasibility of the proposed scheme.

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This paper presents a single-stage high-frequency full-bridge electronic ballast for high-pressure mercury lamps in high-luminance LCD projector systems. The studied electronic ballast is found to have high conversion efficiency due to its single-stage circuit with zero-voltage switching features. A high power factor can be achieved by using developed single-stage topology. The operation principles and design considerations are analyzed and discussed in detail. A laboratory prototype is designed and implemented for driving a 150 W projector lamp. The simulation and experimental waveforms are given to verify the feasibility of the proposed method.