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I'm trying to figure out what kind of transformer this is. It's part of an AC to DC converter.

It's a symbol of a transformer with a Z between the two windings.

enter image description here

Andy Hemphill
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    Hi, please check https://electronics.stackexchange.com/questions/407633/common-mode-choke-symbol-and-orientation, the LCM, i believe, stands for L Common Mode – MakePlatanGreatAgain Apr 03 '23 at 14:36

1 Answers1

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It is not a transformer.

It is two magnetically coupled inductors, i.e. a common-mode choke.

Justme
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    A transformer *is* a perfect description of it; it's just being used sideways to a power transformer (e.g., think of it as a 1:1 current transformer). Note that the "inductors" are never rated for saturation current (or if they are, it's extremely small). (Mind I'm here using '"inductor"' in the commercial sense i.e. a component sold for energy storage purposes, with rated inductance, Q and Isat; and "transformer" in the sense of a power transfer component intended to store minimal energy.) – Tim Williams Apr 03 '23 at 19:29