Design and Implementation for Tunable Adaptors

• Main Authors: Hsiao-Wen Chen, 陳曉雯
• Other Authors: Yung-Shan Chou
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/19412793035158294566

碩士 === 淡江大學 === 電機工程學系碩士在職專班 === 96 === This thesis presents an output voltage tunable design for the adaptors. The design consists of a scheme which can automatically detect the load conditions. Accordingly, the output voltage of the adaptors is tuned to be smaller in the light load, which in turn reduces the associated MOSFET loss so as to achieve the purpose of saving energy. Whereas in heavily load, the output voltage of the adaptors is tuned back to the normal value. The core of the design is a fuzzy system chip implemented by Complex Programmable Logic Device (CPLD), which is comprised of Fuzzifier Module, Fuzzy Knowledge base (FKB), Fuzzy Inference Engine and Defuzzifier Module. Having obtained the current sampled data, a PWM signal is produced through the operation of the fuzzy system chip. The pwm signal is fed into the adaptors to adjust the adaptor output voltage in order to align with the desired reference voltage. In this thesis the design has been applied to a notebook. Experimental results demonstrate that the tunable adaptors design can achieve energy saving, temperature reduction and acoustic noise reduction. This idea of the design can be applied to several electrical products.