High Frequency Time-division Multi-phase Series-series Resonant Coreless Power Converter

• Main Authors: Kuo-Syun Chien, 簡國訓
• Other Authors: Jing-Yuan Lin
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/sn6xfq

碩士 === 國立臺灣科技大學 === 電子工程系 === 106 === This thesis presents a high frequency time-division multi-phase series – series power converter, and using coreless planar transformer as the main structure of transmission power that achieve the purpose of thinning size. Explain how to choose the best planar coils and optimize overall circuit efficiency. In order to reduce its switching loss at high frequency, primary side switches achieve Zero-Voltage-Switching(ZVS). Synchronous rectifier is utilized on the secondary side to minimize the conduction loss. Gallium Nitride devices are used both at primary and secondary switches to reduce the converter volume and switching losses to achieve high power density. Based on the planar transformer design, analyze the geometric shape of coils through Maxwell to obtain higher quality factor coils. Reducing copper loss of primary and secondary side, and increase the coupling coefficient to improve transmission efficiency by changing the winding configuration. Eventually, analyze the effect of coils with different turns-ratio for resonant tank current and element loss to select optimal planar transformer. According to the experimental result, the maximum output power of overall systems is 100W and the highest power transmission efficiency can be up to 87.8%, and verify effect of the coils parameter for overall loss.