Cell phone fast charging circuits

Nov 14, 2018 6 Replies
M

Hello,



My Motorola phone supports "Turbo" charging, apparently charging my phone at 9-12V after establishing a secret handshake with the charger.



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Is there a chip that performs this authentication?



I'd like to build a car charger for my phone without blowing it up, but I haven't seen any sample schematics.



All I've seen is a reference to a Qualcomm patent:

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Apparently Turbopower is compatible with the Qualcomm method.



Oh! I found this too, which mentions details on the secret handshake:

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but this seems odd to build a boost converter to boost 5V to 12V, especially if vehicle power is available at 12-14V already.



Any suggestions?



Thanks,



Michael



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M

I may have answered my own question...

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Input voltage specs seem a little low for vehicle use though. I guess I'll need a Buck after all...

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Michael

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M

And that led me to...

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from this list:

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M
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G

Well good, I'm glad that's cleared up. Always happy to help. :^)

George H.

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M

Many thanks :D

Sometimes researching while writing a question clears things up.

Although, I'm surprised I haven't found many amateur circuit builders playing with the ACT4526 or the CHY100D...

Michael D.

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G

Sure I find the same thing... I start writing a question to SED and half way through my brain comes up with what might be the answer.

George H.

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M

On that note, I did some tests to see if the TurboCharging is worth it or if it's all in my head.

The 2.1A charger gave me a linear charge rate charging my phone from 55% battery to 81%, and charged at a rate of 0.68% per minute.

My Motorola Turbo Charger gave me a linear charge rate from 53% to 77% and charged at a rate of 1.4% per minute, then slowed down after 77%. This is more than twice as fast as the 2.1A charger.

Michael

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