Transformer structure
The present invention describes a planar transformer having a plurality of juxtaposed magnetic cores as well as a two-layer printed circuit board for spiralling a plurality of windings. Each arm of a plurality of juxtaposed magnetic cores respectively goes through a corresponding hole in the middle of these windings, to magnetically couple the current in the main winding to the other windings.
1. A transformer structure, said structure comprising:
at least three juxtaposed conductor traces, wherein a middle of each conductor trace has a hole; and
a core having at least three arms, wherein each arm goes through a corresponding hole.
2. The transformer structure of claim 1 , wherein said juxtaposed conductor traces are formed over a two-layer printed circuit board.
3. The transformer structure of claim 1 , wherein the conductor traces are wired in a spiral trace.
4. The transformer structure of claim 1 , wherein each conductor trace is a multiple-turn winding.
5. The transformer structure of claim 1 , wherein the core is a ferrite core.
6. A transformer structure, said structure comprising:
a two-layer printed circuit board with at least three conductor traces and at least three holes, wherein each conductor trace surrounds a corresponding hole; and
a core having at least three arms, wherein each arm goes through a corresponding hole.
7. The transformer structure of claim 6 , wherein the core defines a magnetic path through said arms and respectively linking said conductor traces.
8. The transformer structure of claim 6 , wherein the conductor traces are wired in a spiral trace.
9. The transformer structure of claim 6 , wherein the conductor trace is a multiple-turn winding.
10. The transformer structure of claim 6 , wherein the core is a ferrite core.
11. A transformer structure, said structure comprising:
a two-layer printed circuit board with at least three conductor traces and at least three holes, wherein each conductor trace surrounds a corresponding hole; and
a ferrite core having at least three arms, wherein each arm goes through a corresponding hole.
12. The transformer structure of claim 11 , wherein the ferrite core defines a magnetic path through said arms and respectively linking said conductor traces.
13. The transformer structure of claim 11 , wherein the conductor traces are wired in a spiral trace.