Little Help With Wireless Charging Specs

Boogr

Well-known member
Oct 25, 2018
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I'm just trying to better understand the whole wireless charging situation with my Pixel 3 XL.

As I understand it:

* The Pixel Stand (and the phone) use some proprietary protocol/hardware to actually "fast charge" a Pixel 3?

* Regular Qi pads output at 5W, and there are others that do 7.5W and/or 10W for handsets like iPhones and Galaxy's to "fast charge" them?

So is there a recommended wattage for pads to charge a Pixel 3?

Is there a "do not exceed" wattage to be aware of?

Is something like this still compatible with a Pixel 3 or is there a potential for problems?

https://www.amazon.com/Wireless-Seneo-Certified-Standard-Charging/dp/B071FNL73K/ref=sr_1_5?ie=UTF8&qid=1540772254&sr=8-5&keywords=qi+10+watt+wireless+charger

Any other info or light you can shed on this would be greatly appreciated.
 
The Pixel 3 / 3 XL uses Qi standard, meaning it will charge with any wireless charger. Until now, the only charger that utilizes 'fast charge' and will charge at a full 10W is the Pixel Stand. So even if you use a third party rapid charger, 5W, 7.5W or 10W, the Pixel will limit the charge to 5W. Google is working with third party charger so "Google Certify" and use fast charging (7.5W or 10W).
So far, I do not believe wireless chargers out there go above 10W, so you should not be worried there.
 
The phone draws what it's designed to draw, Boogr, the pad doesn't "push" the power into the phone, so a 5,000 Watt charging pad will work just fine, as long as it follows the Qualcom Quick Charge standards. The phone and the pad actually communicate (wirelessly, of course) and come to an agreement as to what the fastest charge voltage they have in common is. (That's where the "wattage" comes in - 2 Amps at 5 Watts is 2.5 Watts - 2 Amps at 9 Volts is 4.5 Watts, etc.) If the pad could supply 500 Amps at 9 Volts, the phone would still draw 2 Amps.

It's like light bulbs. Your house probably "supplies" about 200 Amps, but a 100 Watt light bulb still draws 100 Watts (1 Amp). Plug it into a 10,000 Watt, 110 Volt generator, and it still draws 1 Amp.

So there's no "do not exceed" wattage. If you're looking for a charging pad for a Pixel 3, and want to keep the same pad for future phones, look for the highest rating pad (or stand) you can find. The Pixel will only use 10 Watts, but you can buy Qualcom Quick Charge 3 wireless chargers that will supply up to 18 Watts, if you can find any (that's the current maximum specified), and the phone will still draw only 10 Watts. When you buy your next phone that will draw 18 Watts (20 Volts at probably about 1.11 Amps), the charger will supply it. If you can find a Quick Charge 4 pad, that will extend the use even further, as phones that support that standard come out. And your old 2010 phone? They weren't wireless, but if you plug one into a QC 4 charger, the charger doesn't get any answer from the phone, so it reverts back to the old 5 Volt charge, and everything's fine.
 

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