Why Power Adapters Are So HUGE
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- Опубліковано 15 кві 2019
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Why are external AC adapters often huge and unwieldy?
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One thing you forgot to mention is certification. Generally, any device sold in North America that uses high voltage inside has to be UL rated or equivalent. By keeping the power supply outside of the device, you can re-use the same UL-rated power supply with multiple devices without having to get each one certified individually.
0:33
Just make a bunch of FOOOLLL BRRRIDDGGEEE RECTIFIERS
LMG: Linus were out of video ideas
To convert ac to DC you need a FUUUUULLL BRIDGE RECTIFIAAAA
I remember when I was in middle school. One of the pins in the power adapter for my laptop broke. So I got the brilliant Idea to cut the cable off the adapter, and the plug of the cable for the power adapter's power, then spliced it together. I took care to tape the splices individually with painter's tape( because I didn't have electrical tape) then again with packaging tape. I plugged it into the wall cautiously. Nothing happened,( I must have done it right!) Then with the greatest sense of accomplishment I've ever felt at that point I went and plugged the other end into my laptop, there was a short pop, then a loud ass pop that rang through the house, and the power shut off in both mine and my sister's room. My family thought it was a lightning strike, I let them believe it.
#TLDR
actually its not the conversion from ac to dc that is the problem.
That's not why they're called switching power supplies. They're switchmode power supplies. They contain a control chip that turns on and off at a much higher frequency than the utility supply. The high frequency means that a smaller transformer can be used, saving space and money, as well as reducing waste heat. The control chip monitors the output voltage and adjusts it by altering the switching.
Linus. I really like your videos, but this video has some cringeworthy explainations.
I backup/transcode film cam data on location.
This video is so wrong. Switching power supplies are called switching because of the way they work. ALL switching power supply convert AC to DC in the initial phase (in a 220V system the DC rises to something like 400V). Then a switching circuitry sends current impulses (15KHz - 50KHz) into a transformer. Those impulses are driven in a way that the output from the transformer is exactly what the power supply is designed to output. This has nothing to do with the fact that they can adapt to 220 or 110V outlets (actually not all switchers can adapt to this automatically.. a lot o them still has a 220/110 selector). And regarding the integrated power supply (like your example... the monitor) is still switching power supply. TVs also has switching power supplies.... consoles... basically any device used today.. has a switching power supply.
Just because transistors are getting smaller doesn't mean inductors can get smaller too, which power bricks need to regulate voltage. Some things in physics just aren't capable of being shrunken down to save space, in the name of power efficiency.
1:40
I spent 5 years in the seventies in a factory making switching power supplies for mainframes. These where about 24 inches long, 8 inches wide and about 6 inches tall and they weighed a huge amount.
Nice video. I found it both entertaining and educational. I like how you simplify a concept in a way that the general population would understand without knowing much about how electricity works. I also really enjoyed the outro for this video it was pretty amusing.
Do writers proof read scripts? Linus looking silly a lot more lately using incorrect terms.
"Smaller, lighter, more portable" I wish that were true for smartphones...
You have given one of the best reasons for the updating of our current main panel here in America [and Canada] to the European DIN rail style. Since this is an industrial and more robust system. Our current system is behind, a good 15 to 20 years to the European.
Hey guys my laptop adapter stop working so bought another one and i was playing war zone and the adapter auto turn it off , i couldn't even touch it, is there any thing that i can do to cool it a little bit? is that a efficient practice at all?