stan2004 posted:Adrian! posted:Also... You know those chokes all of us are putting in series with the power supplies to keep the RF impedance high? Under a short circuit transient those are going to cause a massive di/dt event at the TIU too...Good point. If you open the TIU you will see such a choke at the Voltage In connectors. A short circuit current on a TIU output channel flows thru the TIU choke. So the di/dt phenomenon, for lack of a better term, is the same as the passive-mode TIU when adding the choke between the PSX-AC and the track. Same choke application - to keep the RF impedance high to protect the DCS-signal integrity.
Consulting some power electronics folks (not me) the proper terminology is "Inductive kick-back".