This paper reports on an analysis and design the externally-coupled transcutaneous transformer (ECT) for a totally-implantable artificial heart (TAH). Although the primary coil used ouside the body is closely wound on the ferrite core, the secondary one inside the body is loosely wound on the core in order to easily attach to the body. It is difficult to accurately analyze and design the ECT because of such a different structure from general transformers. In this paper, assuming that the leakage inductance of the secondary coil caused by the loose winding is approximately equal to that without the ferrite core, we analyze and design the ECT. As a result, we found that the characteristics obtained from the analysis agreed fairy well with those from measurement, the optimum turn ratio of primary and secondary coils was 10:10, and the DC-to-DC and AC-to-AC energy transmission efficiencies were 88% and 98.5%, respectively. It is concluded that the approximate analysis and design of the ECT described in this paper is valid, and the desinged ECT shows sufficiently high performance for a TAH.
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