Po-Yen Chen

Development of an energy efficient street light driving system

As the LEDpsilas lumen efficiency increases rapidly in recent years, many new LED illumination applications are emerging. LEDs have features such as long-life, small and low power consumption. Therefore, they are used in various occasion such as full color large sized LED displays, traffic lights, and etc. In this paper, an energy efficient street lighting system is proposed. The presented system consists of a LED lamp module, a digitally-controlled multi-phase driving system for LED lamp and an Ethernet-based communication interface. A developed prototype system will be presented in this paper and experiments will be performed to verify the correctness of the proposed system. According to the experimental results, the lighting efficiency is 85 % and the conversion efficiency is 90 %.

Development of a Zigbee-based electronics ballast system

In this paper, a Zigbee based electronics ballast system is proposed. The presented system consists of a digitally-controlled electronics ballast for TS fluorescent lamp, a Zigbee based DAM (digitally addressable lighting interface) bridge module for wireless control and a graphical user interface (GUI) for inputting the control parameters. A developed prototype system will be presented in this paper and experimental results will be provided to verify the correctness of the proposed system.

Sequential-color voltage-adaptable RGB-LED backlight driving system with local dimming control for LCD panels

Higher luminance efficacy, faster response, lower power consumption, longer operation life, wider color gamut and environmental issues makes RGB LED backlight driving system suitable for high end LCD applications. In this paper, a sequential-color voltage-adaptable RGB LED backlight driving system with local dimming control for LCD panels is proposed. Using the topology proposed in this paper, the panel can be divided into 4 individual areas. A digitally-controlled multi-phase driving system for RGB LED lamp, a current sharing method, and a human machine interface (HMI) for dimming the backlight module will be presented. The output voltage is adjustable so that RGB LED maintains the desired string current and maximizes the efficiency. Finally, experimental results are presented to validate the effectiveness and correctness of the proposed system. Besides the presented system can successfully drive the RGB LED backlight module, and the color-mixing can be achieved using the developed HMI and driving system.

RGB LED backlight driving system with area control

Higher luminance efficacy, faster response, longer operation life, wider color gamut and environmental issues makes RGB LED backlight driving system suitable for high end LCD applications. In this paper, a RGB backlight driving system for LCD panels with individual area control is proposed. Using the topology proposed in this paper, the backlight can be divided into 96 individual areas, and can easily be expanded to higher number of areas. In order to verify the effectiveness of the proposed system, a developed prototype will be presented and experiments will be carried out. According to the experimental results, the power conversion efficiency is 90 % and individual area control can be achieved.

Design and implementation applying mechatronics system concept for a low-cost high performance wiring machine based on brushless DC motor drives

A wiring machine, driven by a brushless DC motor (BLDCM), is designed and implemented applying integration considerations of mechatronics system for a successful prototype development and described in this paper. Stable speed response during wiring operation with variations of load conditions could be achieved by making use of the portion shift of the overall system design efforts for this wiring machine. Features of its mechanical structure and mechanism of the developed wiring machine both can obviously lower the firmware requirements and level down sophisticated control algorithms, hence it is applicable to realize design concept and control methodology in two 8-bit data processing chips of PIC18F4431 and PIC18F8720. Description based on design issues of this wiring machine is also arranged for showing feasibility of the presented concept and its realization approach herein. Meanwhile, it demonstrates the effectiveness of the proposed simple control strategy for the low-cost high performance wiring machine system.