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| 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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