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Old 10th September 2018, 06:32 PM   #91
jackinnj is offline jackinnj  United States
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The Bode-100 thread
Can you run the impedance plot on the primary -- load the trafo with 50R and 5K. Maybe we can design a zobel.

You can calibrate the bode 100 in impedance mode with 1206 SMD resistor and Pomona BNC to Banana adapter -- open, short, load. Make sure that the value of the resistor matches that in the advanced setting pop-up dialogue.
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Old 10th September 2018, 10:09 PM   #92
DualTriode is offline DualTriode  United States
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Plots;

first 50R

Then 4.99K
Attached Images
File Type: png Big HR 50R.png (46.5 KB, 97 views)
File Type: png Big HR 4.99K.png (48.5 KB, 97 views)
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Old 11th September 2018, 05:17 PM   #93
jackinnj is offline jackinnj  United States
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The Bode-100 thread
Here's the Omicron application note for trafo modeling:
https://www.omicron-lab.com/fileadmi...ling_V_2_0.pdf
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Old 12th September 2018, 09:44 PM   #94
DualTriode is offline DualTriode  United States
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Hello,

Over the summer I spent some quality time with the book Power Integrity by Steven Sandler including Chapter 7 about Measuring Impedance. I also spent time with the transformer modeling Application Note. I am trying to understand what I know.

If you make all the measurements and calculations discussed in the Application Note you have everything you need for a transformer SPICE model.

Jack,

The big Home Roll injection transformer impedance plots looked a little messy. So I tested the little brother transformer with the terminations that you recommended. Plus I included 3 more termination:

Primary shorted or 0 Ohms.
Primary 10 Ohms.
Primary 50 Ohms.
Primary 4.99K Ohms.
Primary open.

See the attached plots. I do not see any sharp peaks where a zobel would help.

Looking at the plots it becomes clear to me that termination impedance (Load) has everything to do with the transfer curves of the injection transformer. If there is no injection resistor per say and the injection transformer coil is in series with the power supply it looks to me that the effective termination impedance of the injection transformer is closer to the 5K or higher impedance end of the range of things.

See Post 59 to see the transformer.

Thanks DT
Attached Images
File Type: png Small 40 turn 250 F short.png (43.4 KB, 75 views)
File Type: png Small 40 turn 250 F 10R.png (44.5 KB, 75 views)
File Type: png Small 40 turn 250 F 50R.png (44.6 KB, 74 views)
File Type: png Small 40 turn 250 F 4.99R.png (45.9 KB, 5 views)
File Type: png Small 40 turn 250 F Open.png (46.4 KB, 8 views)

Last edited by DualTriode; 12th September 2018 at 09:47 PM.
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Old 13th September 2018, 01:11 AM   #95
jackinnj is offline jackinnj  United States
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I am working on the reflow oven at the moment -- Controleo3
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Old 13th September 2018, 03:59 AM   #96
DualTriode is offline DualTriode  United States
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Sounds like fun new things.

Be careful of the nasty fumes that come from the solder paste and flux.

DT
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