Ideas for thermoelectric cooler with current mode control

Ruzbeh Shariff

Prodigy 30 points

Other Parts Discussed in Thread: DRV591

Hi,

I'm looking at designing a bidirectional supply to run a thermoelectric cooler.

I've seen the DRV591, but it doesn't meet the requirements of my application.

My application requires currents of +/- 8 A with a voltage up to +/- 20 V to drive that current.

I'm thinking of using a PWM controller to run a voltage controlled buck converter where the feedback loop is closed around output current instead of output voltage.

Just wondering if TI has anything that might have already been done along these lines?

Thanks,

Ruz

over 10 years ago

0 JohnTucker over 10 years ago

TI__Guru**** 191445 points

Can you post your complete specification?

0 Ruzbeh Shariff over 10 years ago in reply to JohnTucker

Prodigy 30 points

Hi John,
Sure. The module is to behave like a current source.

Vin = 24V @ 300W max
Vout = +/- 1 - 20 V
Iout = +/- 0 - 8 A

The set point is set in Amps.
The resolution is +/- 50mA.
Ripple of +/- 50mA is OK.

The slew rate is in ms.
Low switching frequencies (100-400 kHz) are OK. The magnetics don't have to be very small.

Anything I missed?
-Ruz

0 JohnTucker over 10 years ago in reply to Ruzbeh Shariff

TI__Guru**** 191445 points

So you are really not looking for bi-directional converter, but a 24 V input with output from a range of +/- 20 V and current +/- 8A, correct? And you want to force the current and let the voltage fall where it may?

0 Ruzbeh Shariff over 10 years ago in reply to JohnTucker

Prodigy 30 points

Yes, exactly.

-Ruz

Power management

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Ideas for thermoelectric cooler with current mode control