Institute：Southern Taiwan University of Science and Technology
Advisor：Prof. Ju-Li Lin
Advisee：4A012097Hao-Min Liu
4A012096Cheng-Ting Tsai

Wireless charging species

Wireless charging introduction and
principle

Three alliance Compare

Three Union introduced

Wireless charging Disadvantages

Magnetic induction

Magnetic resonance

Laser light sensor

WIFI-band transmission

Magnetic resonance coupling

Microwave conversion

Principle of operation of the Faraday induction, when
the current through the coil, it will generate a magnetic
field; and the magnetic field generated by the voltage
will form later will produce current with the voltage, it
can be recharged with the current. Wireless charger is
such rid of the shackles of wires. Currently the most
common wireless charging solutions are mainly:
electromagnetic induction, generating a current
through the primary and the secondary coil, thus
transferring energy from the transmission segment to
the receiving end.

The sender and the receiver reaches a certain
frequency, can form a magnetic resonance
phenomenon, to achieve the purpose of energy
transmission through this way. Advantages of MRI
technology is higher transmission power, with the use
of this technology PowerByProxi said the retail side
50,100W output do not have any problem, commercial
areas and can even reach more than 1000W of output
power. The disadvantage is high cost, and the resonant
frequency will affect the transmission efficiency, but
the design is easily done on multiple devices
simultaneously charging.

The same principle and solar energy, the laser hit the
solar panels, the use of semiconductor light energy
into electrical energy, the efficiency is determined by
the conversion efficiency of solar panels, gallium
arsenide solar energy conversion rate of 35%, but the
laser vulnerable to obstruction and Weather impact,
and high energy laser harmful to people.

Through the power and home Wifi network similar
radio frequencies to transmit. Application of the
principle is similar to Wifi

Principle from the tuning fork resonance frequency of
the magnetic field will produce the coil is energized,
copper coils or if the metal around the same frequency
will be shocks, and generate electricity, the future can
be built-in power supply Notebook or Personal
Conputer, getting around with the same frequency The
receiver can be charged shocks and electronic products.

Originally radio waves have energy, used to pass
messages and sound, you can separate the energy
collected into charging energy, this method 360
transmission, no direction, the faster the farther the
wave attenuation, resulting in low conversion efficiency
2014 merger
WPC
A4WP
PMA
Wireless Power
Consortium
Alliance for
Wireless Power
Power Matters
Alliance
Technology
Magnetic
induction
Magnetic
resonance
Magnetic
induction
Membership
145
36
40
Licensed Products
141
0
0
The main
members
HTC、APPLE
Samsung
BlackBerry
Full name
LOGO





Using the principle: electromagnetic induction
Specifications:
Output Power: 5 W
Charging distance: 5mm (Z-axis)
Transmit band: 96k ~ 205khz







Using the principle: magnetic resonance coupling
Specifications:
Output Power: 5 W
Charging Distance: X-axis is 210mm
Y-axis is 140mm
Z-axis of 50mm
Transmit band: 6.78Mhz





Using the principle: electromagnetic induction
Specifications:
Output power: 5 watts to 10,000 watts
Charging distance:
Emission band:






Transmission distance: only close charging.
Transfer rate: Once range exceeds the limit, the
charging efficiency will decay
Cost: There is not yet universal, resulting in cost can
not be lowered.
Low compatibility: Because there is no unified
standard, and therefore can not change through use.
Severe fever: When will the power conversion losses,
so the user will use
Feel the high heat.


http://technews.tw/2014/12/14/wirelesscharging/
http://www.technical-direct.com/201305/%E7%84%A1%E7%B7%9A%E5%85%85%E9%9
B%BB%E6%8A%80%E8%A1%93%EF%BC%88wirel
esscharging%EF%BC%89%E6%93%BA%E8%84%AB%
E9%BA%BB%E7%85%A9%E5%85%85%E9%9B%BB
%E5%99%A8%E5%AF%A6%E7%8F%BE%E7%84%A
1%E9%99%90%E5%8F%AF/
Thanks
!