| Summary: | 碩士 === 國立高雄海洋科技大學 === 微電子工程研究所 === 99 === This study presents an AC/DC converter with high-step-down ratio of non-isolation Buck Converter used in LED lighting systems. Utilizing the Buck Converter as the basic framework for circuitry, we modify the circuit for alternating dual switches and add an additional inductor for storing/releasing energy considering the characteristics of output efficiency of buck converter with the expectation of achieving the low-power consumption of LED lighting systems. There is no need for high frequency transformer to increase the duty cycle ratio by applying the dual switches and dual inductors into the circuitry. The improvement of such device significantly fixes the inefficiency and instability of the high voltage drop pressure of the Buck Converter due to the duty cycle is too small. Without the use of transformers, the circuit structure is relatively simple. Therefore, it could reduce the cost of driver circuit, and increase its competitiveness in the business/commercial market. Through simulation and analysis in this particular study, we strive to validate our assumptions by assembling the proposed circuit, then testing it with a LED driver test module.
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