Hello,
Due to the PGA incapability to provide the needed current for the resolver's primary coil. I've chosen to used external discrete excitation circuit. The solution is as follow: connect each of the OEx prin to a simple biased push-pull transistor amplifier (Class AB) through a coupling capacitor.
The circuit seems to be working fine in normal operation. but in case if EXC+ and EXC- are shorted, there is an important amount of current passing through the transistors.
My question is : Can the internal Excitation diagnostics of the PGA (using IEx feedback pins) detect and disable the internal exciter in such faults. or am i obliged to add a current limitation solution (using transistors)?
Thank you for the support.
Yassine
