Wireless Charging

Institute： Southern Taiwan University of Science and TechnologyAdvisor： Prof. Ju-Li LinAdvisee： 4A012097Hao-Min Liu 4A012096Cheng-Ting Tsai

Wireless charging species

Wireless charging introduction

and principle

Three alliance Compare

Three Union introduced

Wireless charging Disadvantages

Outline

Magnetic induction

Magnetic resonance

Laser light sensor

WIFI-band transmission

Magnetic resonance coupling

Microwave conversion

Wireless charging species

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.

Magnetic Induction

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.

Magnetic Resonance

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.

Laser light sensor

Through the power and home Wifi network similar radio frequencies to transmit. Application of the principle is similar to Wifi

WIFI-band transmission

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.

Magnetic resonance coupling

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

Microwave conversion

2014 mergerWPC A4WP PMA

Full name Wireless Power Consortium

Alliance for Wireless Power

Power Matters Alliance

LOGO

TechnologyMagnetic induction

Magnetic resonance

Magnetic induction

Membership 145 36 40

Licensed Products 141 0 0

The main members HTC、 APPLE Samsung BlackBerry

Comparison of thethree major

alliances

Using the principle: electromagnetic induction

Specifications: Output Power: 5 W Charging distance: 5mm (Z-axis) Transmit band: 96k ~ 205khz

WPC Introduction

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

A4WP Introduction

Using the principle: electromagnetic induction

Specifications: Output power: 5 watts to 10,000 watts Charging distance: Emission band:

PMA Introduction

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.

Wireless charging disadvantages

http://technews.tw/2014/12/14/wireless-charging/

http://www.technical-direct.com/2013-05/%E7%84%A1%E7%B7%9A%E5%85%85%E9%9B%BB%E6%8A%80%E8%A1%93%EF%BC%88wireless-charging%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%A1%E9%99%90%E5%8F%AF/

References

Thanks !