Loss Shifted Design of Transcutaneous Energy Transfer Systems

Abstract

This paper describes an analytical design procedure for shifting losses in a transcutaneous inductive energy transfer system. Miniaturization of implanted components is commonly desired. However, the local power loss density is limited by thermal issues. Optimizing components of the transfer system such as coils themselves is the common way for reducing power losses. Shifting power losses represents an additional method for miniaturizing components on the secondary side of a transcutaneous energy transfer system. Design equations for an asymmetrical loss distribution in an inductive energy transfer system are presented. Measurements of exemplary systems support the calculations and show that the secondary coil power losses can be drastically reduced with the drawback of increased losses on the primary side and a lower overall efficiency.