Power optimisation for wearable heart rate measurement device with wireless charging G. Kiruthiga, A. Sharmila, P. Mahalakshmi, M. Muruganandam Journal of Medical Engineering and Technology, 2017 Continuous measurement of heart rate is necessary for monitoring the patients with heart ailments. A wearable which continuously measures heart rate of an individual by a method called reflectance-based photoplethysmography (PPG) computes the heart rate of an individual according to the volumetric changes in blood flowing through the body is developed. In order to make the device more compact as well as with IP67 and IP68 standard, wireless charging technique is employed because it helps to get rid of wires while charging. Following the Qi standard for designing wireless power receiver circuits makes the device interoperable and work with greater efficiency with reduced losses. Impedance matching and designing the circuit to operate under resonance condition increases coupling efficiency in case of inductive coupling.
Wireless charging for low power applications using Qi standard G Kiruthiga, Mahajan Yash Jayant, A. Sharmila International Conference on Communication and Signal Processing Iccsp 2016, 2016 Wireless power charging powers the storage device without any cords which makes the device more compact, water proof, easy to use and provide even more comfort. The efficiency of power transfer depends on many factors, few of them are quality factor of the inductor coil, coupling coefficient, distance between receiver and transmitter coil, impact of core used for the coil. This paper discusses about wireless power transfer by inductive coupling technique, design considerations of the coil used for power transfer and tuning of LC tank circuit to attain resonant frequency between transmitter and receiver.
Enhancement of fetal ecg signal using adaptive noise cancellation International Journal of Pharma and Bio Sciences, 2015
