Wall plug charging and power flow
Discussion
This should be something that i should know or at least know how to find out, but for some reason i cannot find any information on this, so i'm turning to you intelligent lot for help.
I have a Samsung 45W fast charger, that plugs into the wall.
Could anyone tell me if it is the charger or the device that is charging, that is intelligent to know how much power it can give or take?
To give you an example.
My phone, Samsung S10 Note+ can take as much power as the wall plug can give, and fast charges in as little time as possible.
That's all well and good, the phone knows how much power is coming in, and charges accordingly. If i use a different source of power for a charge, the phone charges at a slower pace.
However, i would also like to use the same Samsung wall plug charger to charge the battery on my wireless earphones and baby monitor handheld, when it's not charging my phone, more out of convivence and just keeping to the one cable.
Both of these devices have a USB-C connection, but the manual for the earphones case mentions to not use a fast charger (small print) and there is no information about the baby monitor.
However, the baby monitor has DC 5V 1A by the USB port, there are no marking on the earphone case.
Is there a possibility that i could "overcharge" the batteries in either of these devices, via the USB-C connection?
I have a Samsung 45W fast charger, that plugs into the wall.
Could anyone tell me if it is the charger or the device that is charging, that is intelligent to know how much power it can give or take?
To give you an example.
My phone, Samsung S10 Note+ can take as much power as the wall plug can give, and fast charges in as little time as possible.
That's all well and good, the phone knows how much power is coming in, and charges accordingly. If i use a different source of power for a charge, the phone charges at a slower pace.
However, i would also like to use the same Samsung wall plug charger to charge the battery on my wireless earphones and baby monitor handheld, when it's not charging my phone, more out of convivence and just keeping to the one cable.
Both of these devices have a USB-C connection, but the manual for the earphones case mentions to not use a fast charger (small print) and there is no information about the baby monitor.
However, the baby monitor has DC 5V 1A by the USB port, there are no marking on the earphone case.
Is there a possibility that i could "overcharge" the batteries in either of these devices, via the USB-C connection?
My concern is that i don't want the battery to heat up, because of the amount of power that is coming down that USB cable.
I have a Philips cordless beard trimmer, and i used the wrong cable once to charge it.
The Philips unit has it's own wall plug charger, with a built in "transformer" so that the correct amount of charge is coming into the battery.
Once i plugged in another cable, which looked identical, but for another device, and after 10mins the Philips was hot to the touch. It was immediately unplugged and left the in steel bath to cool.
That other cable was plugged straight into a USB socket on a Belkin multiplug strip.
I have a Philips cordless beard trimmer, and i used the wrong cable once to charge it.
The Philips unit has it's own wall plug charger, with a built in "transformer" so that the correct amount of charge is coming into the battery.
Once i plugged in another cable, which looked identical, but for another device, and after 10mins the Philips was hot to the touch. It was immediately unplugged and left the in steel bath to cool.
That other cable was plugged straight into a USB socket on a Belkin multiplug strip.
USB chargers ought to negotiate with the device to determine what it's able/willing to accept, and should start off limiting to a lower current until that negotiation is done - as such, provided everything is working as intended, there shouldn't be any issues with using a higher power USB charger on a device that only expects to pull "standard" USB levels of power.
Dedicated chargers with a captive cable ending in a DC barrel plug or similar should also adapt to what's being charged, however this will be entirely dependent on the device itself limiting the input current, so you may find that some devices cheap-out here and simply rely on the current limiting in the original charger they came with rather than having any current limiting within the device itself - in these cases, using a different charger with a higher current limit could well cause problems.
Dedicated chargers with a captive cable ending in a DC barrel plug or similar should also adapt to what's being charged, however this will be entirely dependent on the device itself limiting the input current, so you may find that some devices cheap-out here and simply rely on the current limiting in the original charger they came with rather than having any current limiting within the device itself - in these cases, using a different charger with a higher current limit could well cause problems.
Edited by twister on Sunday 11th December 15:57
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