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I mean obviously it would work, but it's a very expensive way to get a partial charge into a phone.
And that’s before the losses incurred in the car lighter plug, many of which use a linear regulator to burn off the excess voltage as heat!
Or free for those who work at live events where they regularly change microphone batteries long before they're near dead. Granted, such events are far less common nowadays with the COVID crisis that's going on.
Haven't seen one that bad in a very long time, even the really cheap ones use switchers nowadays.
A friend of mine had one of these cheap switchers fail and test the OVP circuit on his phone. It had 13.8V on the USB output. Thankfully most modern phones have these protection ICs and it simply refused to charge ("Charger Not Compatible With This Device"), but I can imagine some devices could easily be damaged.
Quote from: tom66 on July 20, 2020, 07:11:47 pmA friend of mine had one of these cheap switchers fail and test the OVP circuit on his phone. It had 13.8V on the USB output. Thankfully most modern phones have these protection ICs and it simply refused to charge ("Charger Not Compatible With This Device"), but I can imagine some devices could easily be damaged.And now the various fast charge standards intentionally boost the voltage when requested by the device. How long before some cheap charger comes out with a bug that causes it to raise the voltage on something other than the proper command? Might the USB standards get amended to require devices to survive up to 20V to cover that scenario?
I've never been a fan of using USB strictly for power, and these various nonstandard USB implementations to transfer more power are doubly stupid. If they want to use higher voltages they should have used a different connector.