Hi - I have an application running a 1 kW 500VDC to 25V DC supply for a klystron filament heater. I am using a 3 phase forward converter - each phase driven by a FET half bridge to a transformer primary returning to input mid-point. I drive the six gate drives using six HRTIM pins.
I have programmed this so that each of the gate drive pulses is turned on at a fixed time in the master cycle, and turned off by one of two things: either a timer counter (thus setting duty cycle %) or an event connected to an internal comparator. The comparators use an internal DAC for the -IN reference, and are pinned out to a rectified current transformer on the primary. This then gives me both duty cycle and peak current control for continually adjusting providing regulation.
What I would like is a continual running diagnostic where I can read the status from the HRTIM and determine what caused the most recent commutation off (i.e. counter compare or comparator event). Right now I have to infer that indirectly by calculations and settings, and it would be nice to confirm this directly. I see no control registers for the HRTIM that would give me this sort of status, but there are a large number of control registers so I may have missed this. It may also be possible to hack some clever parallel connection such as separately (in parallel) counting events of comparator triggers, which I could compare to the total number of off-commutations for an interval.
Any ideas? Thanks! Jeff Casey
