- Jan 1, 1970
John said:Nice circuit, a few parts doing a lot of stuff. The only warning I'd
give Jamie is that he may not want fast edges getting into his
isolated analog stuff, and it would be tricky to slow this one down.
Our thermocouple supply was a classic open-loop forward converter,
dual nfets driving a center-tapped transformer, and we shaped the gate
drives to soften things up. Efficiency didn't matter much here. And we
got a nice clean square wave out of the secondaries, which also
clocked the delta-sigma ADC!
If I disable the PWM to the transformer for a couple cycles during ADC
reading would that get rid of the fast edges and common mode noise
I fixed the backwards diodes/caps on the positive and negative rails
of the floating bipolar supply:
"http://rocketresearch.nekrom.com/new/isolated bipolar powersupply/isolated bipolar powersupply3.jpg"