Design of A High Efficiency Buck-Boost Multiple Output Converter

• Main Authors: Chen,Wei Chih, 陳偉智
• Other Authors: 劉萬榮
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/19883077380547550030

碩士 === 國立臺北大學 === 電機工程研究所 === 100 === Multiple voltages are often required for powering many hand-held electronic devices. In such applications, multiple DC-DC converters are often used to convert from a battery to proper multiple output voltages. Each converter usually requires one inductor for the power conversion. Therefore, the multiple inductors used for such application are relatively bulky and a waste of space. In recent years, however, a new class of converters has been reported capable of providing multiple outputs using only single inductor. Therefore, This thesis propose a module using just three power switchers and one compensation with Voltage mode control. These can lower down the loss of the switch, decrease the need of the external components, and has better noise immunity. We use ordered power distribution control (OPDC) which works in continuous conduction mode (CCM) with high efficiency. The DC-DC converter has been implemented in TSMC 0.35-μm 2P4M CMOS process. According to the measurement results, the maximum peak-to-peak output voltage ripple is less than 20mV, and current ranges are between 1mA and 100mA. The DC-DC converter operates in frequency 500 kHz~1MegHz and supplies voltage ranges from 3.6 to 3.8V. The first Buck output voltage can be 1.8V~2.5V and the other Boost output holds 4V~4.6V. The highest efficiency of the circuit can reach up to 94% when the two outputs’ loads are both 50mA.