Author Topic: Phase lead problems on ud2.7c  (Read 596 times)

Offline vince1

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Phase lead problems on ud2.7c
« on: January 27, 2023, 01:26:20 AM »
I have been having problems tuning the phase lead on my drsstc for some time now. It works perfectly fine, even when the phase lead is on, but the phase doesnt change much when i adjust it. The inductor is, to my knowledge, not shorted.

Specs:
Cm200 fullbridge
100kHz freq
currently only running on 40v to test the driver

Is there something obvious I am missing?

Offline davekni

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Re: Phase lead problems on ud2.7c
« Reply #1 on: January 27, 2023, 05:22:46 AM »
Quote
but the phase doesnt change much when i adjust it. The inductor is, to my knowledge, not shorted.
Need more information to make a useful reply.  What is your CT ratio?  What cores are you using?  Do you have the standard 51 ohm burden resistor for CT output (resistor on UD2.7 board)?  What is the min and max inductance of adjustable inductor?  Do you have scope captures showing phase lead at both ends of adjustment?  How did you determine that phase isn't changing much (ie. what signals did you scope)?
David Knierim

Offline vince1

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Re: Phase lead problems on ud2.7c
« Reply #2 on: January 27, 2023, 12:49:46 PM »
Right,that makes a lot of sense! I don't really known how I expected you to know with the info 1 gave. I will go take scope shots tonight and post them here, along with the CT specs and the inductance.

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Re: Phase lead problems on ud2.7c
« Reply #2 on: January 27, 2023, 12:49:46 PM »

 


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