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Type: Posts; User: Swend

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1. ## Thread: Determine Transformer Loss

by Swend
Replies
6
Views
200

### Closed: Re: Determine Transformer Loss

I think I just have come up with a extremely bad design that is extremely lossy.

Thank you, And how about the way I calculate power i.e. can I calculate average power by summing the...
2. ## Thread: Determine Transformer Loss

by Swend
Replies
6
Views
200

### Closed: Re: Determine Transformer Loss

Hi arajur

Here is a picture of one. I use one to measure primary voltage and a second one to measure secondary voltage.
155132

This is exactly my point, it must be very inefficient,...
3. ## Thread: Determine Transformer Loss

by Swend
Replies
6
Views
200

### Closed: Re: Determine Transformer Loss

OK, I will try to rephrase my question.

Accorcing to electronics-tutorials.ws in a ordinary power-transformer with sine AC, the efficiency is
155109

And the power is calculated like this...
4. ## Thread: Determine Transformer Loss

by Swend
Replies
6
Views
200

### Closed: Determine Transformer Loss

Hi friends.

I would like to know the loss (power/energy) in a air-core pulse transformer of my own fabrication.

What we are looking at is this:
155096

I'm measuring voltage with two...
5. ## Thread: Bridge Rectifier won't Rectify

by Swend
Replies
26
Views
638

### Closed: Re: Bridge Rectifier won't Rectify

Yes that's what I did, but I wrote the opposite., sorry. And now I changed caps because the 1n blew up it was only 3KV. So I found some old USSR caps of 22p 12KV put those across the 100M, and a...
6. ## Thread: Bridge Rectifier won't Rectify

by Swend
Replies
26
Views
638

### Closed: Re: Bridge Rectifier won't Rectify

So I made a 100:1 with 100M+100n/1M+1n and it also works. I was actually using 100:1 until this voltage rise thing threw me off in the wrong direction. The top resistor is made of glass and the...
7. ## Thread: Bridge Rectifier won't Rectify

by Swend
Replies
26
Views
638

### Closed: Re: Bridge Rectifier won't Rectify

Well, I tried adding capacitance (ranging from 33p to 2.2n) across the 100M, and what I saw on the scope was that the full 6Vp-p from the signal generator appeared across the lower 100K resistor,...
8. ## Thread: Pulse transformer output measured vs. calculated?

by Swend
Replies
23
Views
605

### Closed: Re: Pulse transformer output measured vs. calculated?

I don't think there is one

155074

You only get the current after integration, see post #20
9. ## Thread: Pulse transformer output measured vs. calculated?

by Swend
Replies
23
Views
605

### Closed: Re: Pulse transformer output measured vs. calculated?

Whats the reasoning for that the ramp should not be there? The trace in post #20 is the integrated result, the raw di/dt output is as below scope trace and does not show any DC offset. Here is a...
10. ## Thread: Bridge Rectifier won't Rectify

by Swend
Replies
26
Views
638

### Closed: Re: Bridge Rectifier won't Rectify

"my first DIY HV probe" - ;-) Actually it's my second, the first one was with a 10x10M resistors that didn't work quite well. Maybe I should run a fundme.com campaign and get me some prof equipment,...
11. ## Thread: Bridge Rectifier won't Rectify

by Swend
Replies
26
Views
638

### Closed: Re: Bridge Rectifier won't Rectify

That's a nice probe, I will wish for one.

Me too, so I tried to make them compensated, see post #14

- - - Updated - - -
12. ## Thread: Bridge Rectifier won't Rectify

by Swend
Replies
26
Views
638

### Closed: Re: Bridge Rectifier won't Rectify

Well, I tried adding capacitance (ranging from 33p to 2.2n) across the 100M, and what I saw on the scope was that the full 6Vp-p from the signal generator appeared across the lower 100K resistor,...
13. ## Thread: Pulse transformer output measured vs. calculated?

by Swend
Replies
23
Views
605

### Closed: Re: Pulse transformer output measured vs. calculated?

Here is the revised measurement with my newly compensated voltage dividers

155064

X-axis is nanoseconds
"hi" = primary
"lo" = secondary

This is measured with 30Kohm load on the secondary.
14. ## Thread: Bridge Rectifier won't Rectify

by Swend
Replies
26
Views
638

### Closed: Re: Bridge Rectifier won't Rectify

OK, I will order some 1Megs and try your suggestion.

- - - Updated - - -

Yes FvM did mention that, and that's what I'm going to do today.

- - - Updated - - -
15. ## Thread: Pulse transformer output measured vs. calculated?

by Swend
Replies
23
Views
605

### Closed: Re: Pulse transformer output measured vs. calculated?

if you use a resistor instead of a reactive component e.g. the transformer, the ringing will gradually diminish with increasing resistance, until about 1.5Kohm when the pulse becomes a smooth...
16. ## Thread: Pulse transformer output measured vs. calculated?

by Swend
Replies
23
Views
605

### Closed: Re: Pulse transformer output measured vs. calculated?

It's a commercial thing, if I were to discuss that in public, it would become public domain and then it wouldn't be commercial anymore, I'm sure you can appreciate that, I'm not trying to be a...
17. ## Thread: Pulse transformer output measured vs. calculated?

by Swend
Replies
23
Views
605

### Closed: Re: Pulse transformer output measured vs. calculated?

There is no square pulse anywhere, what you are seeing is the pulse.
18. ## Thread: Bridge Rectifier won't Rectify

by Swend
Replies
26
Views
638

### Closed: Re: Bridge Rectifier won't Rectify

I calculated Z for the secondary winding to about 60ohm, and the resistive load is 30Kohm (2nd measurement) - does that qualify as hi-Z?

Could you suggest a specific one?

- - - Updated -...
19. ## Thread: Bridge Rectifier won't Rectify

by Swend
Replies
26
Views
638

### Closed: Re: Bridge Rectifier won't Rectify

Hi Brian.

It is a single pulse, here is the oscillogram from the primary side, you have to multiply v/div with 10.000 (TEN THOUSAND) to get the correct voltage.
155046

I'm sure there...
20. ## Thread: Bridge Rectifier won't Rectify

by Swend
Replies
26
Views
638

### Closed: Re: Bridge Rectifier won't Rectify

The three oscillograms were side by side when I submitted the post, but now I see they are on top of each other, so the original post has lost it's meaning. So let's start again from the beginning.
...
21. ## Thread: Bridge Rectifier won't Rectify

by Swend
Replies
26
Views
638

### Closed: Bridge Rectifier won't Rectify

Hi friends!

I made a simple diode bridge rectifier, except that each diodes is made up of ten STTH812 in series, and those are ultrafast 1200V 8A diodes with 100nS rrt and 400nS frt. But it...
22. ## Thread: Pulse transformer output measured vs. calculated?

by Swend
Replies
23
Views
605

### Closed: Re: Pulse transformer output measured vs. calculated?

For voltage, a resistive 1000:1 voltage divider 100M/100K. For current, a Rogowski coil.

I'm sure that it does, but I use the same measurement technique on the primary, so I'm hoping that any...
23. ## Thread: Pulse transformer output measured vs. calculated?

by Swend
Replies
23
Views
605

### Closed: Re: Pulse transformer output measured vs. calculated?

Yes, could that be the reason that the voltage drops on both primary and secondary when I add more winding on secondary? I'm a little bit puzzled by that, could it have something to with the fact...
24. ## Thread: Pulse transformer output measured vs. calculated?

by Swend
Replies
23
Views
605

### Closed: Re: Pulse transformer output measured vs. calculated?

I hear what you are saying, but there are some issues with that. First is that what's on the primary side cannot be simulated, and secondly I'm the manufacturer of the pulse transformer which a...
25. ## Thread: Pulse transformer output measured vs. calculated?

by Swend
Replies
23
Views
605

### Closed: Re: Pulse transformer output measured vs. calculated?

Actually it's a physical circuit, not a simulation. And of-course I was wrong applying ohm's law. Basically I just wanted to check if calculated would yield something close to measured in order to...
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