Author Topic: Strange signal on CE of bridge any idea's on what this is?  (Read 629 times)

Offline donnersm

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Strange signal on CE of bridge any idea's on what this is?
« on: September 05, 2019, 07:48:28 PM »
Busvoltage: 340V max
prim 7,5 winding  flat spiral inner diameter 14 cm outer diameter 28cm
sec: 1780 diameter 8cm  32Awg
Topload toroid minor=5 major=20
tank cap: 0.033uf
Resonance 208Khz


Using UD2.7c with phase shift
Half bridge using semikron SKM100GB125DN


All signals all looking good, as in....What I expect.

However in order to adjust the phase lead  to eliminate spikes....nothing much happens.
I mean it does something because I can hear the sound change when I adjust the slot 7 inductor and i can see the signal on the scoop shift a little from left to right and back.  I tried several inductors up to 393.

I connected my high voltage differental probe to the CE of on part of the bridge and I see a nice pulse train except it has a strange puls in the middle. It's like it is skipping or extending a pulse...( see attachment..I have no idea why it is doing this. When i change the slot 7 inductor or adjust it....that pulse changes and you can see two pulses glued together ....So I am guessing it it related to the phase shift. however, when i disable the phase lead by changing the jumper....it is still there..

Jeroen van Dijk who is helping me is also not sure what the cause is.( UpDATE......according to him its related to the OCD....he has always been right so far...heheh.) Anyway, beside the fact that i need some help, I like to post it here because i believe there is something to lear for others as well. 
I am afraid to run the coil full power until I know what is causing this and how to solve it.
« Last Edit: September 05, 2019, 07:52:57 PM by donnersm »

Offline Mads Barnkob

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Re: Strange signal on CE of bridge any idea's on what this is?
« Reply #1 on: September 05, 2019, 08:32:40 PM »
Do not worry, this is where your interrupter stops and the energy reverses back into the DC bus as its rings down.

There would be something wrong if it was missing!

You can see it here as the blue trace and yellow is primary current:

« Last Edit: September 05, 2019, 08:36:31 PM by Mads Barnkob »
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Offline donnersm

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Re: Strange signal on CE of bridge any idea's on what this is?
« Reply #2 on: September 06, 2019, 02:11:13 PM »
Thanks Mads….that's all I need to know!  Time to increase the Amps!

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Re: Strange signal on CE of bridge any idea's on what this is?
« Reply #2 on: September 06, 2019, 02:11:13 PM »

 


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