Electronics > Beginners
Can I charge my laptop with DC-DC boost converter
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Reksyong:
I'm not good at explaining but I will try my best.
The thing is will my laptop be damaged if I charge it directly with a dc to dc boost converter from a 12V battery? Like this automatic buck-boost converter which I have at the moment: https://www.aliexpress.com/item/100W-Automatic-Boost-Buck-Converter-CC-CV-5-30V-To-1-25-30V-8A-5V-12V/32704420331.html?spm=a2g0s.9042311.0.0.1aca4c4dhAqoYG


Since this is a switch mode converter and I don't have an oscilloscope, I'm not sure if the output will be clean or does any noise in the dc output will damage anything inside the laptop. I did search on youtube that other people are actually powering it with a boost converter but didn't really say much if it's safe or not.
rx8pilot:
There are no guarantees, but as long as the voltage matches and the current capability is the same or higher..... you should be fine. Even if it is somewhat noisy, the computer should be able to cope with it.

Perhaps you can add a ferrite just before the connector just to be safe.

Short and misplld from my mobile......

David Hess:
Unless there is some other problem, it will work fine.  Noise should not be an issue and if it was, it would not damage the laptop.

The most likely problems are failure of the external boost converter which applies high voltage to the laptop or drawing excessive current causing the external converter to drop its output voltage or shut off.

Rick Law:

--- Quote from: David Hess on May 27, 2018, 04:49:34 pm ---Unless there is some other problem, it will work fine.  Noise should not be an issue and if it was, it would not damage the laptop.

The most likely problems are failure of the external boost converter which applies high voltage to the laptop or drawing excessive current causing the external converter to drop its output voltage or shut off.

--- End quote ---

Another possible failure - I hit that one likely due to my own lack of experience....

The laptop will soak up quite a bit of current.  Your plugs, connectors, better be made well.  Poor connections will heat up.  My connector was cut from a failed laptop brick with some of the strands already broken at the stripped part.  With a very short wire already (plug with about just about a couple of inches of wire), I did not re-cut that to strip it better - and I soldered the rest poorly, the connection got rather hot and eventually broke by itself during my first go.  It looks to me the remaining strains got too hot burnt away - I think.  In any event, I ended up cutting and re-strip it nicely just to prove it can work.  It did work but I ended up buying a replacement laptop brick with a long and un-patched cabled.

I can imagine, piping 6A over a poorly made plug to charge your laptop overnight may not give you a good night sleep.
Reksyong:

--- Quote from: rx8pilot on May 27, 2018, 05:23:18 am ---There are no guarantees, but as long as the voltage matches and the current capability is the same or higher..... you should be fine. Even if it is somewhat noisy, the computer should be able to cope with it.

Perhaps you can add a ferrite just before the connector just to be safe.

Short and misplld from my mobile......



--- End quote ---

I was thinking of adding the ferrite as well.



--- Quote from: David Hess on May 27, 2018, 04:49:34 pm ---Unless there is some other problem, it will work fine.  Noise should not be an issue and if it was, it would not damage the laptop.

The most likely problems are failure of the external boost converter which applies high voltage to the laptop or drawing excessive current causing the external converter to drop its output voltage or shut off.



--- End quote ---

Is there any safety measure that I can use to shutoff the boost converter from going over voltage if it ever occur?


--- Quote from: Rick Law on May 27, 2018, 05:41:44 pm ---Another possible failure - I hit that one likely due to my own lack of experience....

The laptop will soak up quite a bit of current.  Your plugs, connectors, better be made well.  Poor connections will heat up.  My connector was cut from a failed laptop brick with some of the strands already broken at the stripped part.  With a very short wire already (plug with about just about a couple of inches of wire), I did not re-cut that to strip it better - and I soldered the rest poorly, the connection got rather hot and eventually broke by itself during my first go.  It looks to me the remaining strains got too hot burnt away - I think.  In any event, I ended up cutting and re-strip it nicely just to prove it can work.  It did work but I ended up buying a replacement laptop brick with a long and un-patched cabled.

I can imagine, piping 6A over a poorly made plug to charge your laptop overnight may not give you a good night sleep.

--- End quote ---

Thanks for the heads up, I didn't know my power brick was supplying maximum of 6A as well.   :-DD

This mean that this boost converter will produce a lot of heat as well.
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