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Photovoltaic Cells with Increased Voltage Output for Optical Power Supply of Sensor Electronics

: Helmers, H.; Wagner, L.; Garza, C.E.; Reichmuth, S.K.; Oliva, E.; Philipps, S.P.; Lackner, D.; Bett, A.


Lerch, Reinhard (Vorsitzender) ; AMA Fachverband für Sensorik e.V., Wunstorf:
AMA Conferences 2015. Proceedings : SENSOR 2015 and IRS 2 2015; Nuremberg Exhibition Centre, Germany, 19. - 21.5.2015
Nürnberg: AMA Service, 2015
ISBN: 978-3-9813484-8-4
International Conference on Sensors and Measurement Technology (SENSOR) <17, 2015, Nuremberg>
International Conference on Infrared Sensors & Systems (IRS²) <14, 2015, Nuremberg>
Conference Paper
Fraunhofer ISE ()
Material; Solarzelle; Technologie; III-V-Photovoltaik; Konzentrator-Photovoltaik; Power-by-Light; cell; multi-junction; multi-segment; misalignment; temperatur; votlage; power light; Materialien - Solarzellen und Technologie

An elegant solution for the power supply of sensor electronics is the application of power-by-light technology. With this technology several challenges related to conventional copper wiring are inherently overcome; benefits are galvanic isolation, the suppression of electromagnetic interference, and the possibility to combine power and bidirectional data transmission in a single fiber link. In order to power sensor electronics efficiently, a supply voltage in the range 3 to 12 V is typically required. This paper deals with the photovoltaic laser power converter used to convert the transmitted optical power back into electricity. The advanced cell concepts of multi-junction and multi-segment cells are discussed which both aim at an increased output voltage on the device level, thereby eliminating the need for additional DC/DC conversion. Modeling and experimental results of GaAs based cells are presented, namely of single-junction 2- to 12-segment cells as well as of a dualjunction single-segment structure. A discussion of the pros and cons of the different concepts is given, focusing on the consequences of misalignment and temperature changes.