High-efficiency coupling-insensitive transcutaneous power and data transmission via an inductive link

Abstract

Abstract-This paper presents a new approach for transmitting RF power and signal via an inductive link. Such an approach optimizes the power efficiency of the overall transmission scheme comprising the power amplifier plus the inductive link. Power amplification is based on the single ended class E concept. The power amplification stage is self oscillating, the oscillation frequency thus being influenced by the coupling of the coils. The resulting operating frequency offset yields an improved power transmission performance of the circuit since the oscillation frequency tracks the absolute transmission efficiency maxi-mum. A detailed analysis is given. Realization of the described ap-proach requires a minimal number of circuit components. Experimen-tal and theoretical results are in good agreement. I