philipTheTech

the first run on the overhauled driver with no soda got to -20c in 3.5 minutes :)

the old way was to run the Peltier's at max cooling and then turn the power down so it was at 1c steady state were it would take time freeze the soda solid again 😂 soon I will be able to analyze the new cooling profile and have an analog PI(D?)...

I use a 0.3% 100ohm at 0C temperature sensorMAX31865 and digikey 1759-1020-nd I 3D printed a rotation/compression ring to squeeze the sensors onto the side of the can for direct measurements this is a 2.8mm sensor. I bring it down to -10c for...

next is to create a PID and use the eFlexPWM as the throttle to set the temperature of five Peltier 1206s to almost freeze a can in my 500W soda cooler. (-10c in 4.5 minutes)

WOW! this is exactly what I was looking for. Thanks.

I will be controlling 5 FETS , 6 amps each on 2 25Amp PS so for the discusion here, I will focus on the 3 controllers here. wow I think it would be easer to use 555 timers to make an offset to a PWM 🤣

Also recommend searching forum for eFlexPWM library. One of the examples is 3 x PWM at 0, 120, 240 deg as you would have for AC motor control. The examples run right out of the box on T4.x

how do I set the PWM outputs to a 30% offset and be able to set the %On Time different values?

the Engineers I am working with said a 12V 30KHz PWM is a good way to go. I was working on a 5 channel 29V Half Bridge Current Mode Buck, and changed to 12V PWM.

each Peltier draws 6 amps and I need to go from a 90% PWM to 5%. 3 Peltier's will draw from on 15V PS and i do not want the PDMs from the Teency to be in phase. I would like a 30% phase shift to distribute the current draw. for example if the...