Power loss analysis of a TET system for high power implantable devices

Efficiency of a transcutaneous energy transfer (TET) system is very important when delivering a substantial amount of power both in terms of heat generation and battery capacity for portable operation. Accurate analysis of the efficiency of different sub-systems within a TET system is important to identify the areas where significant improvements are most likely. A general approach to characterizing and quantifying power losses is presented. The methods are used to identify power loss components in a TET system capable of providing 10W of power under loose coupling conditions. It has been found the greatest potential for efficiency improvements for this system is associated with power conditioning stage, primary resonant inductor and base/gate drive circuits.