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? asked in Science & MathematicsEngineering · 2 months ago

How this LED board works on AC/DC10-30V?

We can see it rectifies AC and has a cap to smooth it.

There are 12 LEDs here presumably in series.

LEDs need 2-3V, so if input is 30V voltage would be 2.5V per LED, just right. 

But what if it's 10V, then voltage across each diode is only 0.8V.Are we to assume there is a boost here to step those 10V to 30V? I see no inductors.Or maybe LEDs are in parallel with a zener to keep the voltage around 3V?What you think?

Update:

https://www.aliexpress.com/item/32974073528.html?s...

Update 2:

Now i see there is an inductor, but is it for a boost converter, hm.

Update 3:

I believe this is the answer https://en.wikipedia.org/wiki/Voltage_regulator#Sw...

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