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| 14.4V ground reference for ADC |
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| Arjunan M R:
Oops, a mistake int the circuit. I connected the input of the opamp in reverse :-DD |
| Arjunan M R:
--- Quote from: Simon on May 20, 2019, 11:41:27 am --- --- Quote from: Arjunan M R on May 20, 2019, 09:09:54 am --- I don't want to go in trouble finding the value of the capacitor and resistor and the pwm frequency of the MCU. I will stick with DAC . It will be much more simpler for me. --- End quote --- If you can't do that then you are wasting your time with electronics, it's a free DAC and you are budget constrained yet you are using all of the over the top expensive solutions. What you want to do is feasible provided you do not put anything digihal in a regulation feedback loop. Current limiting you may get away with but there will be a delay. --- End quote --- Its a good idea especially if you are designing a psu with higher power rating. :-+ :-+ I will do this in my next psu project which will be more cheaper :) because it will be high power and low accuracy |
| Simon:
I was refering to your current limits. This is usually done in analogue so reacts instantly. There are smart mosfets that will cut out in 1µs if overloaded. if the current limit does not react fast enough it can still damage stuff. PWM DAC is easy. the output voltage will be the averaged PWM value, you use a low pass filter that has a cut off frequency 10-100 times lower than the PWM, simple matter of physics. |
| Arjunan M R:
--- Quote from: Simon on May 20, 2019, 03:34:00 pm ---I was refering to your current limits. This is usually done in analogue so reacts instantly. There are smart mosfets that will cut out in 1µs if overloaded. if the current limit does not react fast enough it can still damage stuff. PWM DAC is easy. the output voltage will be the averaged PWM value, you use a low pass filter that has a cut off frequency 10-100 times lower than the PWM, simple matter of physics. --- End quote --- Can you tell me a part number of any of that smart mosfets? |
| Arjunan M R:
I was trying to get rid of that atmega644 and use arduino uno ((atmega328p) which i already have) so i can get the cost down :-+. I am trying to put as many things as possible in the I2C. |
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