Study and Implementation of a Novel DC-DC Converter for Low Output Voltage and High Output Current

• Main Authors: Chih-Hsien Hsieh, 謝志賢
• Other Authors: Ray-Lee Lin
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/59898430870319487879

碩士 === 國立成功大學 === 電機工程學系碩博士班 === 97 === “A novel DC-DC converter for low output voltage and high output current” is proposed in this thesis. The voltage ratio of this converter is half of a conventional buck converter with the same duty cycle. Since the output current is the sum of two-phase inductor currents with 180 phase-shifts, therefore, the inductors’ current stress and the output current ripple can be effectively reduced. Moreover the currents through two-phase inductor can be balanced automatically, so an extra current-sharing control circuit is no longer required. Consequently, this novel DC-DC converter is suitable for low voltage and high current applications. This thesis first analyzes the proposed converter operating principles and circuit characteristics, and then derivates the voltage mode open-loop small-signal model to discuss the system stability and design the feedback compensator network. Eventually, a prototype circuit with input 12 V and output 1.5 V/ 40 A is implemented to verify the accuracy and feasibility of the proposed converter.