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Is dc dimmer a dc buck coverter?

A

Thread Starter

abdulbadii

Joined Aug 30, 2017
85
Is mostly market found dc dimmer a dc buck coverter ?
Anyone please generous enough to break down and explain its function circuit blocks
 
ErnieM

ErnieM

Joined Apr 24, 2011
8,377
The common dimmers I've used have a 12V input to drive 12V LED strings. The strings have resistors to control the current to the LEDs when driven with the 12V.

The dimming action happens when a transistor (typically a MOSFET) switches the LED string to ground at a duty cycle appropriate to the dimming level.

Most of the duty cycle control is done with a micro, often an ESP type so they can become "smart" dimmers.
 
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