자기공진방식의 전력전송에 대한 BAN에서의 응용 가능성 연구

Abstract

Several studies have proposed the application of wireless power transmission in body area networks, in which power is transferred in a form of an electromagnetic wave or conduction current. However, its transmission efficiency decreases rapidly as a transmission distance increases.

This thesis presents a feasibility on power transmission using magnetic coupling to body area network. The effects of various conditions such as the body posture, transmission distance, number of coils were analyzed to apply magnetic coupling method with a high efficiency to power transmission between devices located on the human body.

The transmission efficiency decreases as the arrangement of the coils changes according to body movement and the misalignment of the center of coils that causes a coil to shift horizontally. However, efficiency is maintained highly with a maximum of 46.2% at a distance of 10 cm, and over 5% at least even when the transmission path has a large curvature of 90 degree. In comparison with wireless power transmission, power transmission using the resonant coils that are coupled strongly through the magnetic field shows high transmission efficiency, even when the human body exists on the transmission path. Therefore, using resonant coils, it is possible to achieve high transmission efficiency in power transmission between devices located on the human body for body area networks. And also, it can be used for easily attachable resonant coils inserted clothes in order that the efficiency of power transmission using magnetic coupling to body area network can be maximized. This method can be applied to energy harvesting based on human body activity to collect energy without wires via harvesting devices located on the human body.