What I was saying is that you don't need an inductor or the high-side FET. That gives a smooth DC voltage, something that you do not need. The thermal lag of the system is much greater than electrical time constant, which means PWM is the way to go. You can get away with a single mosfet controlling the TEC. Trust me, I have spent about a month doing research with these devices..

By using a switching supply, you are only introducing losses and lag into the system. Although, I admit, the lag isn't a problem because of the thermal lag of the PEC.

For the controller, you can get away with a very simple proportional control.

Steve

Hi Steve,

Do you use a digital or analog signal to control the PWM when using it with a propotional controller? and does it provides heating and cooling

Thanks in Advance

 

This is obviously related to your post in the General section, but we prefer that you not hijack and existing thread. Always start a new one for a new question, even if related.

This is the original thread - http://forum.allaboutcircuits.com/showthread.php?t=16201&page=2

 

This is obviously related to your post in the General section, but we prefer that you not hijack and existing thread. Always start a new one for a new question, even if related.

This is the original thread - http://forum.allaboutcircuits.com/showthread.php?t=16201&page=2

Sorry about that..I ll try to start a new thread next time