5 Peltier drive Single Can Thermal Electric Soda Cooler (SCTESC) controlled with a TC4.1 PID

[philipTheTech]

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 PDMs are at 30% then the PS would be 6 Amp conscious. PWM rate is to be around 30KHz. the test code would have a POT that would set the PWMs from 5 to 95%. How do I fix the phase at 30%?
Philip

 

[MarkT]

You know about PWM (without LC smoothing) being bad for Peltier devices and their efficiency?

Fixing that will also cure the uneven current drain.

 

[philipTheTech]

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.