Magnetic Induction and Resonance

8/13/2019 Magnetic Induction and Resonance

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Content

Introduce to the related technologies Key parameters

Inductor and Induction Resonance

Experiments 1 ee : es gn a quare oop n uc or

Inductance 2nd Week : Design a 13.56MHz HF Antenna

Resonance Magnetic Coupling RLC Resonator


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OLEV

KAIST are experimenting with embedding electric strips in roadbeds thatmagnetically transfer energy to battery-powered vehicles

Road-Embedded Rechargers


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Wireless Charger

Wireless charging pad

A charging station sends energy through inductive coupling to anelectric device, which stores the energy in the battery


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Wireless Energy Transfer

Intel demonstrated their new technology for wireless transmission ofpower which uses magnetic induction to transmit power withoutcables. It showed a power loss of only 25% when lighting a 60 W light bulb over a distance of two feet [2008]


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Contactless Smart Card

A contactless smart card is a card in which the chip communicates withthe card reader through an induction technology similar to that of anRFID (at data rates of 106 to 848 kbit/s).


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NFC

NFC , allows for simplified transactions, data exchange, and wirelessconnections between two devices in close proximity to each other.


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Technology

OLEV magnetically transfer energy Wireless charger inductive coupling Wireless power transfer magnetic induction Contactless smart card induction technology

Two coils : Induction, Magnetic couplingInductive coupling, Magnetic induction

Single coil : Inductor, Magnetic field

Two coils system


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Single coil

A loop or coil of conductive material like copper, carrying an alternatingcurrent (AC), is a very efficient structure for generating or capturingor storaging magnetic field.

Fig. 1 An inductor , simply a loop or loops of conducting wire

Single coil : Inductor, Magnetic field


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Two coils : Magnetic Coupling

If a conductive loop is connected to an AC power source, it will generate anoscillating magnetic field in the vicinity of the loop. A second conducting loop, brought close enough to the first, may capture

some portion of that oscillating magnetic field, which in turn, generates orinduces an electric current in the second coil. (Faradays Law)

Two coils : Induction, Magnetic couplingInductive coupling, Magnetic induction


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Q factor for Communication

Q1) For the high-speed datacommunications, ______is required.

(1) High Q LC Resonator(2) Low Q LC Resonator

Q ~ 1/BW

Q3) How do you control theQ of LC Resonator?

Q2) For the high-efficiency wireless power transfer, ______ is required.(1) High Q LC Resonator(2) Low Q LC Resonator


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RLC Resonator

RLC Circuit

The Q of the parallel circuit are given by

L


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1st Week

Design a Square Loop Inductor (L)


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2 nd Week

Design a 13.56MHz HF Antenna (RLC resonator)


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Magnetic Induction and Resonance