Electronics > Beginners
laptop power adapter replacements
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LaserTazerPhaser:
Can a meanwell or some other quality adapter replace an OEM laptop adapter if the output voltage and current meet or the current exceeds the OEM adapter?
Richard Crowley:
Does your mystery load (your unidentified laptop) use a simple 2-pole connector (implying that it operates at a fixed power: voltage/current)?  Or is it something with a more sophisticated arrangement where it negotiates voltage/current with the supply?

If it is a simple 2-pole connector, then it seems likely that any supply of proper voltage and sufficient current will work OK.
Of course it is absolutely mandatory that you get the polarity correct. Else, you will likely toast your laptop as most don't have polarity protection.

Clearly, a fixed-voltage source isn't going to work properly with a load that expects to negotiate the voltage/current.   This is difficult to answer properly as a generic question.
CJay:
As Richard says, some laptops use electronic 'serial numbers' to verify genuine or not so your lapotop may decide it's not a genuine AC adapter and refuse to charge.

I think you could probably get away with using a Meanwell supply, they seem to be generally OK but beware of cheaper supplies, I've seen significant problems with some cheap adapters which cause very odd symptoms on the laptops they're powering (USB ports not working, noise on audio, random lockups) which disappeared when a genuine adapter was used.

GigaJoe:
electronic 'serial numbers' ?
or just resistor on third pin
 
Richard Crowley:
USB-C power has four different power (voltage/current) settings.  As negotiated between the load and the supply.
Three of them are standardized at 5V, 12V and 20V (at various currents) plus an additional mode for specialized gear.

Ref: https://en.wikipedia.org/wiki/USB_hardware#USB_Power_Delivery_(USB_PD)

And, as @GigaJoe mentioned Apple started the standard of fixing the two data pins at various voltages to indicate the voltage/current capability of the supply.


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