I need to power a Thermoelectric module with 10A maximum load current. I'm designing a card with a minimal design in order to change the current or the voltage across the load, given a standard voltage source.
I just need a minimal regulation of the load, which is, just be able to decrease the power of the thermoelectric module from 100% to maybe 80-90%. Thus I was thinking to control the module by voltage, since precise regulation is not needed and voltage control is usually much easier than current control.
I am choosing among a linear voltage or a switching regulator solution. The point is that the output voltage should be absolutely flat, with Maximum 5% ripple. A potentiometer should be used to "regulate" the power of the system. That's why to start with I was looking into linear voltage regulators. The point is that, to be on the safe side, I would require at least a 15V max output voltage and 20A output current model. Thus I was thinking in designing several regulators in parallel, but I am aware that this is a bad idea. How could I design a safe parallel regulator circuit?
If the linear regulator is a bad idea, is there any off-the-shelf step down switching regulator which does not require any external components (no coils or caps) more than a few resistors?
As said I'm not concerned about the accuracy of the system but just about reliability, design robustness and cost.