Watts Up

27 09 2017

Power to your iThing

🚽 WC is the traditional water closet

But talking about this would be off-topic.

Lets talk about *W* ireless *C* harging that means bringing Watts up to your iThing after laying it down on a little machine which functional principle was already born about 150 years ago.

Without the groundbreaking publication of “A Dynamical Theory of the Electromagnetic Field” in 1865, by Scottish J.C. Maxwell wireless charging wouldn’t be possible. So much for the copycat discussion and the simple fact that everything has its preceding ideas.

Again Apple isn’t the first offering WC but after listed as one of the 213 members of the Wireless Power Consortium they now want *to make the things better than they are*. And they will do it again. Others will follow.

How WC works …

ction chargers use an induction coil. An alternating current creates an alternating electromagnetic field around the coil. A second induction coil in the iPhone takes energy from the electromagnetic field and converts it back from alternating to direct electric current to charge the Li-Ion battery.

The source field must cover the receiving coil which results in a short range of energy transfer. So iPhone and charger must be in close contact without any metallic objects between them (they would be a shielding for the electromagnetic field) except an additional case for the iPhone (Leather or Silicone). A metal plate, sometimes used for magnetic car mounts, may already be obstructive.

Over greater distances this method is highly inefficient and wastes the vast majority of the energy put into the transmitting coil. Greater distances between sender and receiver coils can be achieved when the inductive charging system uses *resonant inductive coupling*.

Think of it like this …

A tuning fork can cause another to vibrate when both are tuned to the same pitch. Using the resonance phenomenon energy transfer can drastically be increased and wouldn’t require a close contact between charger and iPhone.

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xcited to see what’s coming next after Apple will massively engage in the WPC. AirPower is just the beginning.

Thanks for taking your time.


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