Author(s)

Bouchta Hajjine^1,2, Christophe Escriba^1,2, Samuel Charlot¹, Anne Hemeryck¹, Julien Roux^1,2, Sabeha Fettouma Zedek¹, Jean-Yves Fourniols^1,2

¹CNRS, LAAS, Toulouse, France.
²Univ. de Toulouse, INSA, Toulouse, France.

Monitoring systems for elderly require a compromise between reduced size and operational autonomy. The latter to get a system as independent as possible and to fit with our application needs for daily use. Our patch is developed as a surveillance system for old people; we chose to equip it with a wireless charging system for greater ease of use, imperceptible in the everyday life and waterproofing. This paper presents the development of a printed receiver coil to be integrated in a wireless charger to be used in an elderly tracking patch. The proposed design is validated using simulation that presents a good agreement with measurement results: Simulation (@150 KHz: L = 10.74 μH; R = 3 Ω) and Measurement (@150 KHz: L = 10.8 μH; R = 3.16 Ω). The receiver coil is elaborated on a polyimide substrate in the cleanroom of our laboratory LAAS-CNRS (Laboratory for Analysis and Architecture of Systems-National Center for Scientific Research) and a PCB (Printed Circuit Board) charger prototype is fabricated to test its performances before the integration of the wireless charging property in the tracking patch. The proposed coil presents a good compromise between small size and efficiency. For a charging current of 7.5 mA, this coil can ensure the recharging of the patch up to a distance of 4.8 mm between the Qi transmitter and receiver which is more than enough for our application.

Wireless Charger, Receiving Coil, Tracking Patch, Cleanroom Process

Hajjine, B. , Escriba, C. , Charlot, S. , Hemeryck, A. , Roux, J. , Zedek, S. and Fourniols, J. (2016) Development of a Printed Coil for Wirelessly Charging a Tracking Elderly Patch. Wireless Engineering and Technology, 7, 83-95. doi: 10.4236/wet.2016.72009.