SPICE simulation of implantable solar power supply for sustainable operation of cardiac biosensors Online publication date: Thu, 25-Jun-2015
by Munna Khan; Ajai Kumar Singh; Syed Shakir Iqbal
International Journal of Biomedical Engineering and Technology (IJBET), Vol. 18, No. 2, 2015
Abstract: This paper presents a low-power implantable solar power supply for battery-operated cardiac biosensors. The main focus of this paper is to generate power from a Photovoltaic (PV) array placed beneath the skin to replenish the depleting battery of the implantable cardiac biosensors. The new methodology extracts maximum power from the implanted PV array receiving Near-Infrared (NIR) light through the skin from the external source and relies completely on power produced by implanted PV array for its operation. The proposed scheme employs a novel voltage-based Maximum Power Point Tracking (MPPT) technique that uses the virtual open-circuit voltage to regulate the supply continuously. The implementation uses PV array modelled in SPICE that provides 10-25 mW power for a current range of 6-14 mA. Simulations show that the implantable supply produces sufficient power and voltage to charge the battery of low-power implantable cardiac biosensors like pacemaker.
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