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High-Efficiency Transmission for Medical Implants

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1 Author(s)
Van Paemel, M. ; Joined the MICAS-group of Willy Sansen in 1979. Together with Stefaan Peeters he started the design of the cochlear implant LAURA (Leuven and Antwerp Universities Research Auditory prosthesis).

In this article, by means of appropriate circuit design the total efficiency can be optimized. On a circuit level, a high efficiency for an inductive power link can be obtained by using a class E amplifier and an active power regulator. The class E amplifier has three advantages: it has a high efficiency, it has a minimal power consumption when the secondary coil of the inductive link is shorted, and it reaches its normal operation almost immediately after turn on (although a high-Q LC circuit is involved). These properties are exploited in the design of two different power regulators, which are simple on-off control systems. The power regulators have never been realized, but the Micro-Cap simulations are really very promising. The author is hopeful that these considerations may inspire young designers to optimize inductive powering systems. Recent papers in reference [6], [7] show that modeling and designing an inductive power link with a high efficiency is still a challenge.

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Solid-State Circuits Magazine, IEEE  (Volume:3 ,  Issue: 1 )