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本文提出了一种适用于光伏能量收集的三模式数字降压转换器，能够处理从50nW到10mW的宽输出功率范围。通过自跟踪零电流检测技术，实现了高效的能量转换，解决了低功耗应用中宽负载范围下的效率问题。
Photovoltaic energy harvesting is an attractive method of developing battery-free systems for wireless sensors, biomedical electronics, and the internet of things (IoT). To obtain an energy-efficient system, low-power digital circuits operating in the near/sub-threshold region are widely used in such applications. Therefore, the design of a low-voltage buck converter, which converts the harvested energy to the regulated output is critical. Sub-1V buck converters have been implemented using a large inductor [1] to operate in a continuous conduction mode (CCM). Both CCM and discontinuous conduction mode (DCM) operation has been demonstrated in [2], using an analog zero current detection (ZCD) technique to extend the available output power range. However, the analog circuit limits the minimum output power to 50μW, and reduces the conversion efficiency under light load conditions. This paper presents a tri-mode digital buck converter for photovoltaic energy
Po-Hung Chen, Chung-Shiang Wu, Kai-Chun Lin
National Chiao Tung University, Hsinchu, Taiwan