I am using a PWM to power/regulate a Thermal Electric Cooler.With respect to the PWM only my normal supply voltage to the PWM is ~20VDC. (2.5 to 30 is an acceptable range). The PWM is calibrated to limit the maximum output to 5.75 VDC. Max allowable current to the TEC is 2.8A.
I need at times to use a battery to power the PWM. Lets assume the need for cooling is the same with respect to the TEC regardless of the source voltage to the PWM. Assuming a battery output of 12 VDC, what effect would this have on the calibration of the PWM. Would it still limit output to 5.75 or would it likely be some other value. Would it affect the current output as well?
Hope this doesn't seem like a stupid question. All I have is some old schematics for this power supply designed by a fellow 10 years ago. He is not available to answer any questions. I fix aircraft for a living. Reading schematics I can handle. Understanding what goes on in the black box is way above me.
I need at times to use a battery to power the PWM. Lets assume the need for cooling is the same with respect to the TEC regardless of the source voltage to the PWM. Assuming a battery output of 12 VDC, what effect would this have on the calibration of the PWM. Would it still limit output to 5.75 or would it likely be some other value. Would it affect the current output as well?
Hope this doesn't seem like a stupid question. All I have is some old schematics for this power supply designed by a fellow 10 years ago. He is not available to answer any questions. I fix aircraft for a living. Reading schematics I can handle. Understanding what goes on in the black box is way above me.