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Contactless Battery Charger for Composite Humidity and Temperature Wireless Sensors

Marques, H. ; Borges, B. ; Ramos, P.M.

Contactless Battery Charger for Composite Humidity and Temperature Wireless Sensors, Proc Conf. on Telecommunications - ConfTele, Lisbon, Portugal, Vol. 1, pp. 1 - 1, April, 2011.

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Abstract
This paper presents the analysis and design of a
DC-DC series resonant power converter used as a contactless
battery charger (5VDC − 1A) for a mobile electronic device. The
system is enclosed in a sealed spherical shell containing
temperature and humidity wireless sensors and related electronic
circuitry for real time composting process monitoring.
Some particular characteristics of the device and its physical
dimensions impose a maximum distance between the primary and
the secondary transformer windings of 20mm. For transformer
type core and windings configuration selection criteria, an
experimental characterization of loosely coupled power
transformers was evaluated.
Both simulation and experimental results, obtained in a
150kHz laboratory prototype, were used as evidence of the
developed theoretical models and analysis.