This paper deals with wireless power transfer (WPT) based on magnetic coupling resonance in order to delivery power to a cardiac pacemaker from the outside of the body. The high-efficiency power delivery, implantation, and safety are key parameters for a WPT system, designed for active implantable medical devices. Therefore, this paper is focused on high-efficiency power transfer, implantation, and safety issues. For the wireless charging of the pacemaker, the LC-S compensation topology is presented and designed based on high-efficiency power delivery. The resonant components of the LC-S compensation topology were extracted in order to ensure that WPT converter operates at resonance frequency. The operation of the presented WPT charging converter is validated by a prototype operating at 300-kHz operation frequency. At 4.2 V output voltage and 0.45 A output current, the WPT efficiency of the prototype is measured as 82.39%. Finally, the safety evaluation of the proposed WPT converter is also discussed based on reference values presented in the literature.

This paper evaluates the performance of a wireless power transfer (WPT) converter for active implantable medical devices (AIMDs). The efficiency is the key parameter in the design of a WPT converter for charging of AIMDs. The compensation topology of a WPT system has an important role for high efficiency power transfer. Thus, this work analyses a WPT converter using LC/S hybrid compensation topology, for wireless charging of AIMDs, in terms of high efficiency power transfer. In the efficiency analyses, the WPT converter is tested by 3D electromagnetic simulation software. 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 than recommended restrictions.

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