Unable to send current through high frequency transformer

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Discussion Overview

The discussion revolves around the challenges faced in achieving expected current gain in a transformer operating at 20kHz. Participants explore potential causes for the lack of voltage across a load despite the expected gain under no load conditions, focusing on transformer design and winding methods.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant reports a current gain of 9.3 but observes no voltage across a 1k resistive load, suggesting a possible issue with the winding method of the secondary.
  • Another participant inquires about the nature of the gain (voltage or current), the impedance of the load, and the turns ratio of the transformer, indicating these factors may influence performance.
  • A different participant emphasizes the need for clarification on the turns ratio, questioning whether it is 9.3:1 or 1:9.3, and requests additional details about the core material and shape.
  • One participant corrects a previous statement regarding the turns ratio, specifying that for a current gain of 9.3, the primary should have 9.3 times more turns than the secondary.

Areas of Agreement / Disagreement

Participants express uncertainty regarding the specific cause of the issue, with multiple viewpoints on the importance of turns ratio, winding methods, and load impedance. The discussion remains unresolved with no consensus on the underlying problem.

Contextual Notes

Limitations include unclear notation regarding turns ratio and insufficient details about the transformer core, which may affect the analysis of the problem.

atich
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I am building a transformer of about 9.3 gain operating at 20kHz. One would think this is saturation but if that were the case there would at least be some voltage across the load. The gain of the transformer is as expected for no load conditions but I cannot get this same voltage across a load. What could be the cause of this?
 
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Is the 9.3 voltage gain or current gain? What is the impedance of your load? How many turns do you have for your primary and secondary and what type of core are you using?

Do you have any ideas what the problem might be?
 
the 9.3 is current gain. There is no voltage across the load which is a 1k resistive load. I think it has to do with the manner in which I have wound the secondary. What is the proper method of doing this? This isn't saturation.
 
For a current gain of 9.3 the primary should have 9.3 more turns than the secondary. What happens to the signal generator output when you put a 1K resistor across it?
 
I don't understand your notation clearly. Are you saying that there is a 9.3:1 turns ratio or a 1:9.3 ratio? What is the measured voltage ratio?
What is the core made of and what shape is it? Do you have a picture. The reason I ask is that the fault seems so bizarre that there must be something drastically wrong.
 
Correction to post #4: I left out the word times and in "For a current gain of 9.3 the primary should have 9.3 times more turns than the secondary."
 

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