Electronics > Projects, Designs, and Technical Stuff
AC Rectified - DC Mosfet dimmer - Hints please
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Zero999:

--- Quote from: TJ232 on April 18, 2017, 04:23:31 pm ---
--- Quote from: bingo600 on April 17, 2017, 07:02:19 am ---
--- Quote from: TJ232 on April 15, 2017, 10:09:16 am ---Any specific reason that you are not looking also to a more classic solution, with ZCD and Triac?
..

Happy Easter!

--- End quote ---

I am interested in PWM'ing the dimmer , and avoid ZCD issues.

For me the "DC" dimmer is "elegant" ,  i do think i'll put in a small 12v 500mA psu , and see if i can get rid of the capasitive psu.
Just bought a few small ones.

I have seen your page(s) , nice projects. But i'd like to go with the DC version.
Happy easter to you too.

Ps: My EE friend says a 10uF/400v would be suficcient , if one goes down that route.

/Bingo

--- End quote ---

Thank you :)

But what's so appealing about PWM'ing the dimmer in that way, what do you consider to be the main advantage of it?

--- End quote ---
Advantage compared to what? A huge variable transformer?

Personally, I'd prefer to use good old fashioned phase control.
TJ232:

--- Quote from: Hero999 on April 19, 2017, 08:09:55 am ---
--- Quote from: TJ232 on April 18, 2017, 04:23:31 pm ---
--- Quote from: bingo600 on April 17, 2017, 07:02:19 am ---
--- Quote from: TJ232 on April 15, 2017, 10:09:16 am ---Any specific reason that you are not looking also to a more classic solution, with ZCD and Triac?
..

Happy Easter!

--- End quote ---

I am interested in PWM'ing the dimmer , and avoid ZCD issues.

For me the "DC" dimmer is "elegant" ,  i do think i'll put in a small 12v 500mA psu , and see if i can get rid of the capasitive psu.
Just bought a few small ones.

I have seen your page(s) , nice projects. But i'd like to go with the DC version.
Happy easter to you too.

Ps: My EE friend says a 10uF/400v would be suficcient , if one goes down that route.

/Bingo

--- End quote ---

Thank you :)

But what's so appealing about PWM'ing the dimmer in that way, what do you consider to be the main advantage of it?

--- End quote ---
Advantage compared to what? A huge variable transformer?

Personally, I'd prefer to use good old fashioned phase control.

--- End quote ---

This was actually also my question, a more classical phase control solution with ZCD and Triac versus the DC PWM MOSFET as above.
mrTheWheel:
@Benta,

Can you please provide me the schematic of your improvements for a AC PWM dimmer circuit?

It seems dimmable LED bulbs need PWM. I wanted to build the revised circuit (the one without the red cross) but indeed the big 400volt capacitor is not going to fit in a small enclosure so I like your idear of placing the cap. between the R4/R5.

Thanks in advance!
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