Looking for a power supply that i can use to power modern laptops with.
My understanding is that they do not just take straight DC 19v but instead they communicate with the charger via data pins and charger responds back as requested.
Obviously average power supply cant do that so is there anything i can look at ?
Something that can limit the current also.
Thanks !
OK....
1. Given your question it would have been useful if you posted a picture , Since you didn't we need to assume it's a basic connector that
has only + and -
a datasheet would have been good as well or wiring diagram.
2. If it is the type that has only Positive and Negative, here is what you do if you plan to run it off a bench power supply.
- First you find a connector that will actually comfortably and snuggly fit into the charging socket, Preferably one that you could butcher.
You cut it off (Preferably) a non working power supply/ Charger , long enough so you have enough slack.
- Now you need to apply power to it, so you CHECK THE POWER REQUIREMENTS ON YOUR LAPTOP
Now you said 19V (it's likely that it's DC but you need to specify this) so let's make the assumption it's 19V DC on the output.
THE TAKE AWAY OF VOLTAGE IS......... DO NOT EXCEED THE VOLTAGE RATING as you will blow capacitors in your laptop.
Voltage is Pressure, ... Too much pressure = BANG !!!
However... Too Little pressure does not. so.. 17V-19V DC is going to be fine,
If you stuff up, it will result in the laptop not starting up, or it will result in slower charge or not full charge.
- Now you need to know the current rating (this is equally important as the voltage), since you have not provided it, i will assume one.
Let's say your laptop has a current rating of 2A (May be written as 2000mA),
Current is speed in a circuit, so....
You need to AT LEAST MEET THE REQUIREMENT, But not go under it .
So, You can have a 2A - 3.5A Transformer but i wouldn't go higher.
so remember DO NOT EXCEED THE VOLTAGE
however..........DO MATCH OR SLIGHTLY EXCEED THE CURRENT
if you provide less current worst case scenario ,it will not switch on, Not because something blew, but because there is not enough
current circulating through the circuit to keep everything powered.
it's important to know these things up front, However, if you hook it up to a bench supply IN CONSTANT VOLTAGE MODE
the current should figure itself out,Assuming your power supply can supply at least that much
- Lastly, YOU MUST GET THE POLARITY CORRECT. so , is it Centre Positive , or Centre Negative, chance are it's centre positive, BUT DO CHECK.