Download - 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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