Power management circuits for hybrid energy harvesting
Loading...
Authors
Liu, Zemin
Issue Date
2019-08
Type
Electronic thesis
Thesis
Thesis
Language
ENG
Keywords
Electrical engineering
Alternative Title
Abstract
Using the previous studies on individual RF and thermal energy harvesting systems, an RF/thermal hybrid energy harvester is presented. Noticing that one of the inputs to the general rectifier stage that is typically connected to the ground level, can come from intermediate rectifier stages or even be the DC output from other circuits, the rectifier in this case can be used as a combining stage for thermal and RF energy. This is done by feeding the boosted voltage from the thermoelectric generator (TEG) into the DC input of the rectifier, which tends to reduce the losses in the AC energy path. Individual MPPT is ensured by fractional-OCV method for the thermal energy and optimal output voltage control for the RF energy. The prototype fabricated in 180-nm CMOS technology achieves a peak end-to-end efficiency of 63.4% with a 915-MHz input RF power and an emulated TEG with 200-Ω internal resistance. With the efficiency of the RF-DC rectifier in consideration, the reported results are comparable to recent publications which only report the efficiency by emulating the RF-DC stage with an ideal voltage source.
Description
August 2019
School of Engineering
School of Engineering
Full Citation
Publisher
Rensselaer Polytechnic Institute, Troy, NY