Author Topic: Why only one flip flop for ZCS-OCD triggering?  (Read 176 times)

Offline Overlordcheese

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Why only one flip flop for ZCS-OCD triggering?
« on: June 27, 2022, 08:31:45 PM »
Hello! I was recently looking at the UD2.7c, as is my daily practice. I always lived the implementation of a flip flop to make it so that in the event of an over current, UVLO, or the pulse has ended, that ZCS is ensured… but that flip flop only changes state when the ultrafast comparator changes from negative to positive, so only half of the ZCS events are detected. Why don’t we invert this signal, do the same thing we did with the other flip flop, and feed both flip flop’s output into an AND gate.
if this sounds stupid, am sorry, but I’ve been thinking on it for a while

Offline davekni

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Re: Why only one flip flop for ZCS-OCD triggering?
« Reply #1 on: June 28, 2022, 05:09:25 AM »
Quote
if this sounds stupid, am sorry, but I’ve been thinking on it for a while
No, definitely not stupid.  Adds a little bit of complexity in order to gain half-cycle-faster response to over-current.  My DRSSTC checks OCD on both edges much like you suggest.
David Knierim

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Re: Why only one flip flop for ZCS-OCD triggering?
« Reply #1 on: June 28, 2022, 05:09:25 AM »

 


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