Hsiu-Ming Huang

A multiple-input DC/DC converter for renewable energy systems

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

Design of an RGB LED Backlight Circuit for Liquid Crystal Display Panels

This paper presents a red, green, and blue (RGB) light-emitting diode (LED) backlight circuit for liquid crystal display (LCD) panels. Some studies have been conducted to devise dimming methods that regulate the RGB LED currents. In this paper, design considerations for the RGB LED backlight are presented. A laboratory prototype for 20-in panels is implemented and tested. The color gamut of an LCD panel with the designed RGB LED backlight is measured and discussed. The experimental results of the laboratory prototype are also shown to verify feasibility of the findings.

A Single-Stage SEPIC PFC Converter for Multiple Lighting LED Lamps

This paper presents a SEPIC PFC converter for driving multiple lighting LED lamps. With the aid of this converter, high power factor and high efficiency can be achieved by a simple single-stage circuit with low device stress features. A burst-mode dimming method is used to regulate the current and brightness of multiple LED lamps. A laboratory prototype is also built and tested. With the prototype, high power factor can remain under universal input voltage operation and individual lamp brightness control.

A single-stage dimmable electronic ballast with high power factor

A novel fixed frequency electronic ballast that consists of a single-stage asymmetrical half-bridge inverter, a load resonant tank and a switched-capacitor dimming control circuit is proposed for driving fluorescent lamps. High efficiency and unity power factor are achieved by the proposed single-stage topology. The switched-capacitor dimming control technique in the studied high frequency electronic ballast provides better EMI features. The steady-state operating principle and design procedure for the proposed single-stage dimmable electronic ballast are analyzed and discussed in detail. A ballast prototype was implemented at the laboratory. The experimental results verify the feasibility of the proposed method.

High-Frequency Dimmable Electronic Ballast for HID Lamps

This paper presents a high-frequency electronic ballast for high intensity discharge lamps. A new fixed frequency dimming method with low electromagnetic interference (EMI) features is developed in this research. The proposed electronic ballast has the advantages of high power density, simple circuit, and low EMI features. The circuit operating principle and design procedures are described in detail. A laboratory prototype was built and tested. The simulation and experimental waveforms verify the feasibility of the proposed scheme

A SINGLE-STAGE PHASE-SHIFTED FULL-BRIDGE ELECTRONIC BALLAST FOR HIGH-PRESSURE MERCURY LAMPS

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.

PAS power supply harmonic elimination by active conditioner

An active power line conditioner is proposed for an aerospace power system that is composed of multiple paralleled power modules. The current harmonics generated by the power supply system can be eliminated and the number of modules in the power supply system can be reduced. Experimental results on a prototype system were shown to verify the feasibility of this method. The proposed power supply system demonstrates benefits such as high efficiency, low current harmonics, and simple configuration.