A DC-DC Boost Converter with Adaptive On-Time Control and Zero-Current Switching for Energy Harvesting System

• Main Authors: Chih-Cheng Chou, 周志城
• Other Authors: Poki Chen
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/54342875643148006935

碩士 === 國立臺灣科技大學 === 電子工程系 === 105 === Sensors play a dominate role in environmental monitoring, disaster prevetion, home care … and so forth to realize the so-called intelligent living for modern humankinds. How to power such immense sensors becomes an everlasting hot topic for related research. In this thesis, a boost converter for on-chip solar cell is proposed to power the succeeding temperature sensor. The adaptive on-time control is adopted to increase the power conversion efficiency under extreme light load and narrow the switching frequency range under input voltage variation. The zero-current switching is also applied to reduce the power loss caused by reverse recovery current to further enhance the overall conversion efficiency. The chip is realized in a TSMC 0.18-μm standard CMOS process with 1.053×0.603 mm2 chip area (including I/O pads). The operational input voltage range is 0.8V~1.2V and the output voltage is stabilized at 1.8V. With post-simulations, the output ripple is around 2% under an extremely wide load current range of 30μA~30mA. The peak power conversion efficiency is 86.45% at 5mA load current.