This having to worry about how far


This technology was proven some 100 years ago
but up until recently has it become more relevant. From a child’s toy to a smartphone
and even a vehicle, today’s technology relies heavily on rechargeable batteries.


Wouldn’t it be great to have your smartphone charging
on or near your table as you enjoy dinner out with friends? Or never be disappointed
by an uncharged set of wireless headphones? How about never having to worry
about how far you may or may not make it in an electric vehicle? Say goodbye to
those bulky batteries and anxiety from the dreading ‘low battery’ notification.

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Like many things in today’s society, technology is evolving and scientist are
discovering new ways to recharge batteries wirelessly. Wireless charging, in
time, has the ability to become the new standard, in the same way that wi-fi
replaced Ethernet cables.


            If this concept has been around for
so many years, how come it has not been utilized until recent years? One major
setback is that wireless charging does not offer the convenience of ‘quick
charging’ as a wired connection would. Another inconvenience is that the device
must be within close proximity to the charging pad, which leaves the user
unable to use it while it is charging.


How does this magic charging work? For
simplicity, let’s start with the idea that for induction charging there must be
a transmitter (example: charging pad) and a receiver (example: cellphone). By
means of a power adapter or USB, direct current is supplied to the wireless
charging system. By using FET’s, a transistor can be used as a switch to drive
current through a series capacitor. The energy within the transmitter is then
converted to alternating current. The transmitting coil will develop a magnetic
field from the alternating current. The receiver has a very similar setup,
including a receiving coil used to gather the incoming power. The receiver is
able to rectify the power using diodes and will filter the power using
capacitors. After the power has been rectified and filtered, it is applied to
the battery in need of charging.



















Scientist have used this concept to evolve and
discover other ways to charge batteries such as resonant charging and far-
field charging. Using resonant frequencies, energy is transferred from the
transmitter to a receiver at distances from 10 centimeters (near-field) up to 15
meters (far-field). By eliminated the need for wired charging, the chances of
dust, water and other corrosive materials can no longer enter. Now that batteries
do not need to hold a charge as long, the batteries can be made smaller. Other benefits
to cutting the cord would be to replace hearing aids and cardiovascular devices
with wireless charging batteries, removing the requirement to have the battery


            The future of this technology is
said to be able to walk into a room and have your smart watch/ smartphone/
laptop begin charging. The future is having an electric vehicle charging as it is
driving down the highway. The future is replacing AC power cords with wireless