Analysis of compensation networks for a transcutaneous WPT system to achieve compliance with ICNIRP basic restrictions

The paper deals with the application of the wireless power transfer (WPT) technology, based on near field inductive coupling, in implantable medical devices (IMDs). A transcutaneous WPT system is considered here to transfer a power of over 10 watts. The selection of the most adequate topology of the compensation network is a key point to mitigate the variation of physical quantities inside the human body, such as internal electric field E and specific absorption rate (SAR). An investigation is here provided to demonstrate the different behavior of each compensation topology in order to obtain compliance with ICNIRP limits in biological tissues.