Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [wireless-charging]

162 questions
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Wireless Power Transfer for a toothbrush

The general idea is to charge a cordless toothbrush from 12V DC, instead of the mains. I have used a simple circuit that I more or less lifted from a Linear AppNote/Demo manual (DC1969). I would like the circuit to be as simple as possible. The…
AndersG
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How big does my wireless charging coil need to be?

Background: I need to wirelessly charge a battery at about 100W. However, there seems to be a gap in the wireless charging market. There are plenty of wireless power transfer systems operating in the sub 20W range for mobile phones, and several in…
Rocketmagnet
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Would a room-sized coil used for inductive coupling and wireless energy transfer be feasible?

My understanding of inductive coupling is that it isn't feasible over long distances because the spread of the magnetic field lines happens rapidly, so not much flux will go through the receiver coil if it's too far apart (not a physicist, this may…
Whelchel
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Measured Q factor of LC circuit does not correspond with calculated and simulated

Still having a problem with measured value of Q factor of parallel LC circuit. My measurememt setup looks like on the picture below. I use Function generator SFG-1003 and Oscilloscope Rohde-Schwarz RTB2002. My LC circuit consists of: L= 33,4 uH R=…
Kols
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How to build a self-made Qi compatible (wireless) charger

So I recently discovered that my phone, a Nexus 5, has Qi wireless charging capabilities. I was wondering if it is possible to make my own charging coil with 24/26awg wire that would look something like this (but without the driver circuit). Then, I…
boblee
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Can wireless charging become more energy efficient?

I've stumbled upon a few articles saying that wireless charging takes more energy to charge something compared to the cable. Like this one. Like in the test from the article, it takes 47.33 % more energy. Why is that? Is there something…
Maltoon Yezi
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Is it viable to transfer electrical power through a glass pane?

I know that there is a way to induct electricity with an electromagnetic field. I also know that is the part of physics used by wireless phone chargers. I have a basic understanding of physics and some electronics. I wonder why there is no product…
Przemek B
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What would happen if you accidentally casually put your apple watch on a wireless charger meant for phones or other higher power devices for hours?

What would happen if you accidentally, casually (because they're supposed to be so convenient!) put your apple watch on a wireless charger meant for phones or other higher power devices for hours? Or rather, what are the general things to take note…
Allen Sierra
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Coupling coefficient variation in Wireless power transfer

Question regarding WPT compensation topologies. I'm trying to make a inductive wireless power transfer system where the RX coil can move quite conisderably relative to TX coil and still transfer decent amount of power. The problem I'm encountering…
Raitis Bērziņš
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Is it possible to redesign a portable electronic device such that it can be charged by a domestic microwave oven?

Soon after iPhone 6 was introduced there was a prank claiming that the smartphone can be charged by leaving it in a running domestic microwave. TL;DR don't do it, it is very, very unsafe. There's a number of videos showing how a lot of things goes…
sharptooth
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Qi Receiver on PCB

I'm looking at implementing Qi charging in my project, would it be possible to have a Qi receiver directly on the back of the PCB (copper traces in the shape of a coil)? Could this interfere with the electronics on the front of the PCB?
Jens
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How does the floating light bulb rotate and power off?

I am trying to understand on a high level, how famous floating light bulb actually works. https://www.floately.com/products/volta-light-bulb I kind of understand how it floats and how it is supplies power to the bulb via electromagnetic…
ng.newbie
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H-bridge PCB with N-channel MOSFETs and a MOSFET driver not working

I recently designed an H-bridge circuit to try to develop a wireless charging circuit. I am currently generating the PWN signals with a function generator. There are two signals which are at 10 Vp-p at 100 kHz with a 50% duty cycle. These signals…
EmeraldMonk
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How to add a magnet to a coil's center without disturbing coil's charging effect?

I have a very nice wireless charger which can charge my smartwatch. Smartwatch itself contains a neodymium magnet on its back (and there are chargers which also contain another neodymium magnet to align the charger and chargee). This is how it looks…
Daniel
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Simple wireless charging standard as used in toothbrushes?

I have a project that requires wireless charging of a small hand-held controller with a single 1S lithium-ion cell. People's initial thought was to use the standard Qi mobile phone chargers to save reinventing the wheel, however they appear to need…
John U
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