Transcutaneous Energy Transmission System for Ventricular Assist Device with Transmission Distance of 2 cm: Stabilization of Output Voltage by Compensation Circuit

A transcutaneous energy transmission system (TETS) is one of the methods for supplying power to a ventricular assist device (VAD). The driving power of VAD changes during exercise or rest by changing the load resistance with a rated voltage of 24 V. Therefore, it is necessary to introduce a DC–DC converter to TETS and to design TETS with less output voltage fluctuation when changing the load resistance. In this study, two types of compensation topologies—SS and double-sided LCC topologies—are introduced to TETS, and their output voltage fluctuations are compared. Consequently, the double-sided LCC topology can reduce the output voltage fluctuation by 13% more compared to the SS topology. Furthermore, when a DC–DC converter is introduced to TETS with the double-sided LCC topology, the rated voltage of the VAD can be kept constant, and the transmission efficiency reaches more than 50%.