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Is dc dimmer a dc buck coverter
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abdulbadii:
Is mostly market found dc dimmer a dc buck coverter ?
Anyone please generous enough elaborate its function circuit blocks
Terry Bites:
For an LED dimmer?
This would be a controlled current source.
See a typical driver with circuit fucntions explained
www.infineon.com/dgdl/Infineon-ILD8150_ILD8150E-DataSheet-v01_05-EN.pdf?fileId=5546d462696dbf120169ba96613f4c20
Siwastaja:
No idea. You would need to post an example of what you think is a "mostly market found dc dimmer", then we can guess.
Optimum way to drive LEDs is a constant-current power supply, which internally provides adjustable current, and has a control input. In such case the "dimmer" would be just a controller which drives the control input.
If the "dimmer" is a separate product which takes DC voltage in and then drives the LEDs, then it - at least hopefully - does constant current regulation and turns the non-optimal voltage based power supply into better-for-LED current source. Buck is a very likely topology to implement this.
Or, the separate dimmer could be something as simple as an adjustable resistor. Who knows, there is a lot of crap on the market.
ajb:
A standalone "DC dimmer" designed for constant-voltage LED loads (for example 12V LED tape), if that's what you're talking about, is just PWM. Its functional circuit blocks would include some sort of PWM signal generator (maybe a 555, maybe an MCU) and a transistor, that's about it. If you added a second transistor or a diode (which might already be present if the dimmer was also designed for inductive loads like motors), an output inductor, and some feedback, then you'd have a buck converter.
There are also dimmable LED drivers in both constant current and constant voltage mode variations that I suppose you could refer to as a 'DC dimmer'. One of those that operates from a DC input might be a buck converter, but ones that operate off of AC line voltage likely use a different topology.
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