Analysis and Implementation of Multi-Resonant DC Power Supply

• Main Authors: Hung-Yu Su, 蘇鴻羽
• Other Authors: Bor-Ren Lin
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/93867403915520609191

碩士 === 國立雲林科技大學 === 電機工程系碩士班 === 93 === With the development of power electronic technique, DC / DC converters are widely used in the telecommunication and other electronic products. Traditional PWM converters due to high switching losses limited the power density and switching frequency. The switching losses will result in large EMI and RFI, so the reduction of switching losses is a major subject to the power supply designer. Resonant converters have drawn lots of attentions due to high efficiency, high switching frequency and high power density. To achieve this targets, with high switching frequency, high efficiency and power density must be developed. Resonant converters are based upon the half-bridge and full-bridge PWM topologies. There are two types of control schemes, duty cycle control and frequency control, to control the output voltage. For frequency control scheme, a symmetrical waveform with variable switching frequency is to control the output voltage. The characteristics and operation principles of series resonant converter, parallel resonant converter and Series-Parallel resonant converter have been proposed and studied. LLC resonant converter has been important in recent years, because of its high efficiency, optimize the converter at high input voltage, high frequency operation capability and simple structure. It is a multi-resonant zero voltage switching converter. The ZVS turn on and low turn off current of MOSFETs can be achieved. With magnetic integration concept, all the magnetic components including inductances transformer leakage and magnetizing can be easily integrated into one magnetic core. The operation principle of LLC resonant converter, design analysis and the experimental results are describled and discussed in this thesis.