I'm designing an industrial control system that incorporates several peltier devices.
As I understand it, these devices are more efficient when driven with a constant voltage, vs being cycled every few seconds.
What I would like to do is drive the peltiers using PWM in the kHz range, and run the power through an inductor to limit the current ripple.
The issue is that my go-to device for high current control is an SSR like this: AD-SSR6M12-DC-200D Afaik, these will not work at kHz frequencies; and at lower frequencies the inductor becomes excessively large.
So here's what I'm wondering. Is there an industrial type device similar to a SSR that will work at kHz frequencies? Ideally I would like to keep the isolation feature as well.
I know I could build my own MOSFET circuit to accomplish this, but a reliable off the shelf device would be preferable. Does such a thing exist?
My peltiers, and the PLC outputs are all 24 volts. The peltiers draw 4.2A at 24V
Link to Peltier Assembly.