| Electronics > Projects, Designs, and Technical Stuff |
| AC Rectified - DC Mosfet dimmer - Hints please |
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| Benta:
:-// :-// :-// --- Quote ---I never directly answer any one persons issue directly. --- End quote --- Fine. --- Quote ---That FET is pretty dinky. --- End quote --- It's an industry-standard IRF730. --- Quote ---I'm doing 480Hz quite often. --- End quote --- Fine. --- Quote ---My gates are at least six times that capacitance. --- End quote --- And? That would make matters worse. --- Quote ---I also don't allow short pulses at either end of the duty cycle. --- End quote --- ??? --- Quote ---20KHz was mentioned. --- End quote --- Not by me. --- Quote ---There doesn't seem to be any practical reason to have a resistance that high. --- End quote --- Do the calc. --- Quote ---As long as you are aware. This is for those that might consider copying parts of your circuit. --- End quote --- Yes. We're warned. |
| TJ232:
Any specific reason that you are not looking also to a more classic solution, with ZCD and Triac? You can find a nice example here: It has all the MAINS related funtions onboard (including phase detection, ZCD,etc), you just need to provide a VCNT voltage control to drive it. Voltage control can be provided by a DAC, PWM, even a 10k pot between Vcc and GND with the viper on VCNT input pin :) Also on the same channel you can find a lot of AC dimmer implementation tutorials with ESP8266, Domoticz, RaspberryPI, etc . Happy Easter! |
| bingo600:
--- 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 |
| bingo600:
--- 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. And that i should use a 100nF X2 after the diode bridge , to be nice to the environment. /Bingo --- End quote --- |
| TJ232:
--- 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? |
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