The Power Consortium is a business alliance of more than 80 companies that are working on similar
technology.
The list of the member countries include: Convenient Power, Fulton
Innovation,
National Semiconductor, Nokia, Philips, Sang Fei, Sanyo and
Texas Instruments etc. The organization started in 1998 with the aim of
creating a
Wireless power charging standard so that the
charging station
and the electronic product recognize each other and charge
automatically.
The consortium has already proved that the electric power can be
transmitted without wires and over limited distance this process is
pretty simple as well. The company has worked on developing a pretty
simple mechanism using which they can develop a platform that could
recognize the device that is kept on it and keep it fully charged all
the time. The technology that they use is pretty simple and pretty
effective one as well in simple words it is called the
Electromagnetic
Induction and the phenomenon is known as Inductive charging, In this
method there exists a charging station that sends power to the device
kept on top with the help of a inductive coupling the induced charge on
the other device is stored on separate batteries.
Qi wireless charging standard basics.
The Qi standard has been developed by the
Wireless Power Consortium
and is applicable for electrical power transfer over distances of up to
40 millimetres (1.6 inches).
The Qi wireless charging standard uses a power transmission pad that
is akin to the charger that would be used in a normal wired system, and a
compatible wireless power receiver that is located in the device to be
charged. The power transfer then takes place using magnetic induction.
The way in which the wireless power charging is achieved conforms to
the standard and allows a single Qi wireless charger from any supplier
to be used to charge any Qi compatible device. As most wireless charging
systems now conform to this standard, it means that only one
charger
pad is required to charge all devices.
There are two categories for Qi wireless chargers:
- Low power: The low power category covers chargers that
can deliver power in the range 0 - 5 watts. This will cover most of the
domestic portable devices like mobile phones, music players, Bluetooth
earpieces, etc..
- Medium power: Chargers in the medium power category can deliver power up to 120 watts.
Within any Qi wireless charging system, there are two main elements:
- Base Stations: The Qi base station is the device
that provides inductive power for the wireless transmission. As such it
contains a power transmitter of which a major element is the
transmitting coil. The overall Qi charger typically has a flat surface.
This is normally referred to as the Interface Surface. The mobile device
or devices may be placed on top of this surface.
- Mobile Devices: The Qi mobile devices are those
which consume the wirelessly transmitted power. This is typically used
to charge the battery contained within the mobile device.
To keep the efficiency as high as possible, it is necessary to ensure
that he coupling between the transmit and receive coils is as high as
possible. To achieve this the mobile device must be placed in the
position where this can be achieved. The Qi standard defines two ways of
achieving this:
- Guided positioning: This form of placement on a Qi
charger involves the use of means to guide the user to place the mobile
in the correct place on the Qi base station for charging.
- Placement anywhere: The second form of Qi charger
placement does not require the user to accurately place the mobile
device on a particular area of the charging surface. Instead a wider
area is usable. This can be achieved by using more than one transmitter
coil.
The frequency used for Qi chargers is located between about 110 and
205
kHz for the low power Qi chargers up to 5 watts and 80-300 kHz for
the medium power Qi chargers.