Author(s): Yasushi Takemura
Wireless power transmission to a medically implantable device deeply located in the human body is essential to develop future therapeutic and diagnosis technology. We present a power receiving module of 20 mW using a thin magnetic wire of 0. 25 mm diameter. A magnetization reversal in magnetic wires with bistable magnetization states induces pulse voltage in a pick-up coil which has been known as Wiegand effect. A twisted FeCoV wire is one of the optimum material yielding this effect. A Fe0. 4Co0.5V0.1 wire of 11 nm length was used as the core material in the pick-up coil. An alternating magnetic applied field of 4.8 kA/m at 10 kHz was applied to the wire. The induced votage to the pick-up coil was measured, and the power obtained from this voltage as power source was evaluated. We achieve the wireless power transmission of 20 mW to a medically implantable device under the excitation field condition which can be realized by a body-sized excitation coil with practical power supply. The experimental details and other possible applications including battery-less modules are also discussed in the presentation.
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