Performance evaluation of a wireless charging converter for active implantable medical devices

Abstract

This paper evaluates the performance of a wireless power transfer (WPT) converter for active implantable medicaldevices (AIMDs). The efficiency is the key parameter in the design of a WPT converter for charging of AIMDs. Thecompensation topology of a WPT system has an important role for high efficiency power transfer. Thus, this workanalyses a WPT converter using LC/S hybrid compensation topology, for wireless charging of AIMDs, in terms of highefficiency power transfer. In the efficiency analyses, the WPT converter is tested by 3D electromagnetic simulationsoftware. The maximum efficiency is obtained as 72.33% while the output voltage is 4.2 V and the current is 0.45 A.Finally, safety performance of proposed WPT converter is also evaluated based on specific absorption rate (SAR) analysis.The average peak spatial head/torso SAR produced by WPT converter is obtained as 0.0254 W/kg, which is lower thanrecommended restrictions.