| Summary: | 碩士 === 國立高雄應用科技大學 === 電機工程系 === 99 === The traditional illumination sources are being replaced by high power white LED because of the advantages, such as small size, high efficiency, long life and others. Therefore, high-power white LED is used as the light source to design indoor lamps in this thesis. An AC-DC single-stage flyback converter was employed to implement the driving surce, and a Digital Signal Processor (DSP) is used to integrate the digital regulation of the converter and the dimming of the LED. The proposed method can increase the system efficiency and reduce the circuit size. In addition, the phase-shifted PWM method can decrease the conduction losses and improve the optical properties of the LED array. Finally, individual module was combined to produce a prototype, and the circuit characteristics of the system were tested and analyzed. The experimental results show that the prototype can operate with high power factor, high efficiency, and good optics.
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