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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