Electronics > Beginners
Power Transformer behavior at higher frequencies
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exe:
BTW, rumors ([1]) say a cheap current transformer can serve as a poor man's injection transformer. Never tried myself.

[1] "APPLICATION NOTE 3245" https://www.maximintegrated.com/en/app-notes/index.mvp/id/3245
Wolfgang:

--- Quote from: exe on January 04, 2019, 02:22:16 pm ---BTW, rumors ([1]) say a cheap current transformer can serve as a poor man's injection transformer. Never tried myself.

[1] "APPLICATION NOTE 3245" https://www.maximintegrated.com/en/app-notes/index.mvp/id/3245

--- End quote ---

Its not a rumour. For a limited frequency range, they work fine. See

electronicprojectsforfun.wordpress.com/injection-transformers/

Its also possible to make homebrew transformers as good as commercial ones, like here:

https://electronicprojectsforfun.wordpress.com/injection-transformers/measuring-commercial-and-homebrew-injection-transformers/



alireza7:

--- Quote from: Wolfgang on January 03, 2019, 09:54:00 pm ---
--- Quote from: alireza7 on January 02, 2019, 08:52:04 am ---Suppose a 220VAC to 110VAC ,50Hz, 20w transformer.

How is it's behavior in higher (1khz up to 10Mhz) frequencies? Does it attenuate signals with high frequencies or not?

Actually i want to know that if using a transformer on the mains line improves EMC of my system and protection against burst signals or not?

--- End quote ---


If you need a wideband transformer, it is probably some type of injection transformer, like here :

electronicprojectsforfun.wordpress.com/injection-transformers/





--- End quote ---

No i need essentially a base band transformer which eliminate surge , burst and conducted RF signals.
Wolfgang:
If I get you right you want a common mode choke ?
T3sl4co1l:
You can eliminate those factors with a synthesized sine wave inverter / UPS -- you cannot eliminate them with a transformer.

A transformer can attenuate them to some extent or another, so if you have some acceptable attenuation figure or noise floor or threshold, we can give a meaningful answer.

Tim
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