Electronics > Projects, Designs, and Technical Stuff

How do you tell what "type" of power a DC power supply is?

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John B:
Yes most applications utilise a CV power supply. When there's a single load circuit, like a string of LEDs, then it makes more sense to implement CC power supplies.

In this case the current is limited by the resistors in the LED strips, within certain margins. The current goes up and down with temperature, but is kept to an acceptable limit due to the resistors.

james_s:
Any decent equipment will have the power requirements listed right on it, or at the very least in a datasheet.

I haven't played with any of those power supplies that say they're for LED use only but I suspect they skimp on output filtering if they have any at all. It doesn't really matter if your LED strip is flickering at 20kHz, you're not gonna see the flicker, but if you try to power an electronic device from a power supply that has a load of ripple in the output it will wreak havoc.

DW1961:

--- Quote from: james_s on July 24, 2020, 04:20:37 am ---Any decent equipment will have the power requirements listed right on it, or at the very least in a datasheet.

I haven't played with any of those power supplies that say they're for LED use only but I suspect they skimp on output filtering if they have any at all. It doesn't really matter if your LED strip is flickering at 20kHz, you're not gonna see the flicker, but if you try to power an electronic device from a power supply that has a load of ripple in the output it will wreak havoc.

--- End quote ---

No doubt. I should get a analyzer. I could just TEST EVERYTHING! I should also get a variable power supply, too. I see them all over Amazon for 100 bucks.

james_s:
Anyone who does anything at all with electronics should have a multimeter, even if it's just a basic $20 model. A bench power supply with CV and CC modes is very handy but there are substitutes you can use in a pinch to accomplish most things.

AndyC_772:

--- 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.

--- End quote ---

^^^ This.

If a power supply is sold with a CE mark, then it's sold as being compliant with all applicable standards.

If the set of standards which apply is different - say, because it's being used with computing, communications or other equipment, instead of the type of equipment for which its testing and certification applies - then it's no longer compliant.

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