8

I was wondering why there are different symbols for common mode chokes and if/how they affect the way I have to connect them.

Common Mode Choke Types

(Upper image is incorrect but left here for understanding the comment from @Felthry)

Common Mode Choke Types

Most often I see type 1 and there is no doubt on how to use them. But with types 2 and 3 I'm not so sure. They must have different meanings as I saw them simultaneously in one circuit. Can anyone enlighten me or refer me to a decent source on what the difference is?

ocrdu
  • 8,705
  • 21
  • 30
  • 42
Peder
  • 223
  • 2
  • 6
  • That's odd... I'd thought types 2 and 3 were alternatives to the dot notation for showing relative polarity, but if they have dots as well as the core symbols, I suppose it isn't. – Hearth Nov 19 '18 at 14:08
  • @Felthry You are right. I uploaded a new image. So Type 2 and 3 are equal? – Peder Nov 19 '18 at 14:29
  • I _think_ (don't quote me on this) that types 2 and 3 are just a method of showing the relative orientation of the windings. 2 and 3 are not the same, but if you swap the polarity of one of the windings, 2 turns into 3 and vice versa. – Hearth Nov 19 '18 at 17:33
  • Does this answer your question? [Inductor Symbol? What does this symbol indicate?](https://electronics.stackexchange.com/questions/439554/inductor-symbol-what-does-this-symbol-indicate) – Tim Williams Apr 03 '23 at 20:47

0 Answers0