A 21 m Operation Range RFID Tag for “Pick to Light” Applications with a Photovoltaic Harvester
Keywords: 
RFID tag
Voltage limiter
RFID reader
Photovoltaic harvester
“Pick to light”
Issue Date: 
2020
Publisher: 
MDPI
Project: 
823895 - SENSOFT - SMART SENSING FOR RAPID RESPONSE TO CHEMICAL THREATS ON SOFT TARGETS
info:eu-repo/grantAgreement/AEI/Retos Investigación: Proyectos I+D+i/TEC2017-89403-C2-2-R/ES/SISTEMA SENSOR PARA JAULAS DE PISCIFACTORIA
ISSN: 
2072-666X
Note: 
This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license
Citation: 
Astigarraga, A. (Aingeru); Lopez-Gasso, A. (Alberto); Golpe, D. (Diego); et al. "A 21 m Operation Range RFID Tag for “Pick to Light” Applications with a Photovoltaic Harvester". Micromachines. 11 (11), 2020,
Abstract
In this paper, a novel Radio-Frequency Identification (RFID) tag for “pick to light” applications is presented. The proposed tag architecture shows the implementation of a novel voltage limiter and a supply voltage (VDD) monitoring circuit to guarantee a correct operation between the tag and the reader for the “pick to light” application. The feasibility to power the tag with different photovoltaic cells is also analyzed, showing the influence of the illuminance level (lx), type of source light (fluorescent, LED or halogen) and type of photovoltaic cell (photodiode or solar cell) on the amount of harvested energy. Measurements show that the photodiodes present a power per unit package area for low illuminance levels (500 lx) of around 0.08 µW/mm2 , which is slightly higher than the measured one for a solar cell of 0.06 µW/mm2 . However, solar cells present a more compact design for the same absolute harvested power due to the large number of required photodiodes in parallel. Finally, an RFID tag prototype for “pick to light” applications is implemented, showing an operation range of 3.7 m in fully passive mode. This operation range can be significantly increased to 21 m when the tag is powered by a solar cell with an illuminance level as low as 100 lx and a halogen bulb as source light.

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