A Circuit for Energy Harvesting Using On-Chip Solar Cells

作者：Ghosh Suvradip^*; Wang Hsuan Tsung; Leon Salas Walter D

来源：IEEE Transactions on Power Electronics, 2014, 29(9): 4658-4671.

DOI：10.1109/TPEL.2013.2273674

• DC-DC power conversion
• energy harvesting
• integrated circuits (ICs)
• solar energy
• switching circuits

This paper addresses on-chip solar energy harvesting and proposes a circuit that can be employed to generate high voltages from integrated photodiodes. The proposed circuit uses a switched-inductor approach to avoid stacking photodiodes to generate high voltages. The effect of parasitic photodiodes present in integrated circuits (ICs) is addressed and a solution to minimize their impact is presented. The proposed circuit employs two switch transistors and two off-chip components: an inductor and a capacitor. A theoretical analysis of a switched-inductor dc-dc converter is carried out and a mathematical model of the energy harvester is developed. Measurements taken from a fabricated IC are presented and shown to be in good agreement with hardware measurements. Measurement results show that voltages of up to 2.81 V (depending on illumination and loading conditions) can be generated from a single integrated photodiode. The energy harvester circuit achieves a maximum conversion efficiency of 59%.

• 出版日期2014-9