Electronics > Projects, Designs, and Technical Stuff
How do you tell what "type" of power a DC power supply is?
John B:
It looks sketchy. I'm not sure I'd trust a cheapo AC/DC pack off ebay/ali-whatever anymore, certainly not one that is "UL LIGTED" :-DD
I've had too many bad experiences, fake specs, bad reliability, even completely random modules shoved inside the plastic pack you see. Not to mention the safety risk you take in isolation and potentially starting fires.
DW1961:
--- Quote from: John B on July 23, 2020, 10:09:28 am ---It looks sketchy. I'm not sure I'd trust a cheapo AC/DC pack off ebay/ali-whatever anymore, certainly not one that is "UL LIGTED" :-DD
I've had too many bad experiences, fake specs, bad reliability, even completely random modules shoved inside the plastic pack you see. Not to mention the safety risk you take in isolation and potentially starting fires.
--- End quote ---
UL Ligted? HAHAHAHA, NICE catch!
So, back to the original question, what is the difference in DC PSU? Does it matter what "type" they are regarding what you can run with them?
I'll start another thread about portable DC power supplies and how to tell if they are any good or not. I guess my question is can you use any quality 12V portable supply with any 12V application, regardless of type of power it delivers?
PS--I'm not plugging in anything to my "good" electronics before I know it's a good supply.
capt bullshot:
Might be just for regulation and applied standards reasons.
Lighting is a different kind of equipment than e.g. a general purpose power brick, so it's tested and declared conforming to different standards.
I bet the load device (wether it's actual LED lighting or something else that can cope with the provided output) can't read that fine print and will just work ;)
DW1961:
--- Quote from: capt bullshot on July 23, 2020, 05:08:48 pm ---Might be just for regulation and applied standards reasons.
Lighting is a different kind of equipment than e.g. a general purpose power brick, so it's tested and declared conforming to different standards.
I bet the load device (whether it's actual LED lighting or something else that can cope with the provided output) can't read that fine print and will just work ;)
--- End quote ---
Yeah, I think you are just right on that too. Reading this page really clarified things. Most all LED light strips or multi-light LED system us CV drivers. One poster above said it might be because ripple and some other undesirable artifact is present becasue it is a 'dirty' supply, but LEDs don't care about ripple (maybe). Constant Voltage is the LED standard.
https://www.ledsupply.com/blog/constant-current-led-drivers-vs-constant-voltage-led-drivers/
Incidentally, my SONY laptop power supply (made by Light-on) says CC/CV on it so I guess it can do both. That makes me wonder if laptops need both? IF so, we know for sure one reason that power supply says for "LEDs only."
capt bullshot:
--- Quote from: DW1961 on July 23, 2020, 06:10:26 pm ---
Incidentally, my SONY laptop power supply (made by Light-on) says CC/CV on it so I guess it can do both. That makes me wonder if laptops need both? IF so, we know for sure one reason that power supply says for "LEDs only."
--- End quote ---
That'd be rather uncommon. Usual laptop bricks have CV output, and some kind of overload limiting / shutdown mechanism (which of course might be some kind of CC operation). I've never seen a laptop that relied on CC operation of its supply.
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