Wireless Electricity Transmission

Magnetic induction is a technology that you will probably remember from your physics classes at high school.

You need two coils, a transmitter coil and a receiver coil. An alternating current in the transmitter coil generates a magnetic field which induces a voltage in the receiver coil. This voltage can be used to power a mobile device or charge a battery.

The presentation below shows how to build a wireless charging system using magnetic induction. 

You will see that products need more than coils and alternatining currents. For energy-efficient power transfer the phone must be able to shut down the transmitter when the battery is full. The phone, therefore, needs to send control signals to the charging station.

The presentation is also available as PDF download.

 

From the Qi Blog

Beware of fake wireless phone chargers

Wireless chargers are sophisticated, high-tech products – safe, efficient, and easy to use. More than 50 million wireless chargers are used safely every day, and that number is growing fast. The vast majority of these 50 million wireless chargers use our Qi standard. We are proud of Qi’s safety record.
Read more

Wireless power market surges as usage leaps forward

IHS Market shares perspective on wireless power market
Read more

De’Longhi Group joins the Wireless Power Consortium

The Wireless Power Consortium has welcomed a new member recently: De’Longhi Group of Treviso, Italy.
Read more