Applying Fully-Digitalized Control Without ADC to Active-Clamped Boost Converter

• Main Authors: Cheng-Han Chuang, 莊承翰
• Other Authors: 胡國英
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/82u3q6

碩士 === 國立臺北科技大學 === 電機工程系所 === 98 === In this thesis, an active clamp circuit applied to the boost converter is presented, which is implemented only by one auxiliary switch, one inductor and one capacitor as compared to the traditional boost converter. In this topology, the main and auxiliary switches both are turned on with zero voltage switching (ZVS) and the output diode is turned off with zero current switching (ZCS), thereby causing the efficiency of the converter to be improved. Aside from this, the auto-tuning technique based on a given look-up table is added to adjust the turn-off instant of the auxiliary switch, so as to enhance the efficiency further. As for the system control, a field programmable gate array (FPGA) is used as a control kernel to fulfill fully-digitalized control. Moreover, since the high-performance analog-to-digital converter (ADC) is costly, and hence the one-comparator sampling technique without any ADC is utilized herein to obtain information on the output voltage and input current of the converter. Finally, via theoretical analysis, mathematical deduction, and some simulated and experimental results, the feasibility and effectiveness of the proposed topology are verified.