Browsing by Author "Lo, Chih-Lun"

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A Single-Inductor Triple-Source Quad-Mode Energy-Harvesting Interface With Automatic Source Selection and Reversely Polarized Energy Recycling
(2019-10-01)
Chen, Po-Hung
;
Cheng, Hao-Chung
;
Lo, Chih-Lun
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
This paper presents a single-inductor triple-source quad-mode (SITSQM) energy-harvesting interface in a 0.18-mu m CMOS process. The proposed reversely polarized energy recycling (RPER) technique improves not only the conversion efficiency at low input voltage but also the system's output power range. The interface employs the buck-boost topology to convert energy from photovoltaic (PV) cells and a thermoelectric generator (TEG) to a regulated 1.2-V output. The proposed converter features four different operating modes, namely, harvesting, recycling, storing, and backup. The operating mode is automatically selected according to the input and load conditions using the automatic source selection mechanism. The experimental results demonstrate 25.3% efficiency improvement and 10x output power range extension from the proposed RPER technique. The proposed SITSQM converter automatically manages three harvesting sources with 82.1% peak conversion efficiency.
An 82.1%-Power-Efficiency Single-Inductor Triple-Source Quad-Mode Energy Harvesting Interface with Automatic Source Selection and Reversely Polarized Energy Recycling
(2018-01-01)
Lo, Chih-Lun
;
Cheng, Hao-Chung
;
Liao, Pei-Chun
;
Chen, Yi-Lun
;
Chen, Po-Hung
In this paper, a single-inductor triple-source quad mode energy harvesting interface with automatic source selection is developed for multi-source energy harvesting. The interface employs buck-boost topology to convert the energy from photovoltaic (PV) cells and thermoelectric generator (TEG) to a regulated 1.2-V output. The proposed converter has four operating modes: harvesting mode (BM), recycling, mode (RM), storage mode (SM), and backup mode (BM). The operating mode is selected automatically according to the input and load conditions to appropriately transfer the energy. The proposed reversely polarized energy recycling (RPER) technique extends the available output power range by 10x with 25.3% efficiency improvement at low input voltage. The measurement results demonstrates the proposed interface achieves the peak efficiency of 82.1%.