Planar transformer
First Claim
1. A planar transformer with increased coupling coefficient comprising:
- a primary spiral coil having a first cross-section of primary coil lines with center points lying in a first plane, said primary spiral coil including;
an inner size Ai1 of the primary spiral coil, Ai1 being a distance between two inner-most primary coil lines in the first cross-section;
an outer size Ao1 of the primary spiral coil, Ao1 being a distance between two outer-most primary coil lines in the first cross-section;
a winding width W1 of the primary spiral coil which is half a difference between the outer size Ao1 and the inner size Ai1 ;
a secondary spiral coil positioned adjacent to the primary coil and having a second cross-section with secondary coil lines with center points lying in a second plane, parallel to the first plane, said secondary spiral coil including;
an inner size Ai2 of the secondary spiral coil being a distance between two inner-most secondary coil lines in the second cross-section;
an outer size Ao2 of the secondary spiral coil being a distance between two outer-most secondary coil lines in the second cross-section;
a winding width of the secondary spiral coil W2 which is less than the winding width of the primary spiral coil W1 (W1>
W2), said winding width W2 being half of a difference between the outer size Ao2 and the inner size Ai2 ;
wherein, the outer size Ao2 of the secondary spiral coil is no greater than the outer size Ao1 of the primary spiral coil; and
wherein the primary and the secondary spiral coils are sandwiched between soft magnetic foils with insulating layers between the magnetic foils and primary and the secondary spiral coils.
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Accused Products
Abstract
Disclosed is a planar transformer comprising a planar primary spiral coil and a planar secondary spiral coil, which are mutually insulated and laminated, wherein, (1) when the winding width W1 of the primary spiral coil and the winding width W2 of the secondary spiral coil have the relationship of W1 ≦W2, the inner size Ai1 of the primary spiral coil and the inner size Ai2 of the secondary spiral coil coincide with each other, and (2) when the winding width W1 of the primary spiral coil and the winding width W2 of the secondary spiral coil have the relationship of W1 >W2, the central axes of the primary and secondary spiral coils coincide with each other, the outer size Ao2 of the secondary spiral coil is equal to or smaller than the outer size Ao1 of the primary spiral coil, and the secondary spiral coil is arranged corresponding to a position at which magnetic flux generated by a current flowing through the primary spiral coil is largest.
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Citations
10 Claims
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1. A planar transformer with increased coupling coefficient comprising:
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a primary spiral coil having a first cross-section of primary coil lines with center points lying in a first plane, said primary spiral coil including; an inner size Ai1 of the primary spiral coil, Ai1 being a distance between two inner-most primary coil lines in the first cross-section; an outer size Ao1 of the primary spiral coil, Ao1 being a distance between two outer-most primary coil lines in the first cross-section; a winding width W1 of the primary spiral coil which is half a difference between the outer size Ao1 and the inner size Ai1 ; a secondary spiral coil positioned adjacent to the primary coil and having a second cross-section with secondary coil lines with center points lying in a second plane, parallel to the first plane, said secondary spiral coil including; an inner size Ai2 of the secondary spiral coil being a distance between two inner-most secondary coil lines in the second cross-section; an outer size Ao2 of the secondary spiral coil being a distance between two outer-most secondary coil lines in the second cross-section; a winding width of the secondary spiral coil W2 which is less than the winding width of the primary spiral coil W1 (W1>
W2), said winding width W2 being half of a difference between the outer size Ao2 and the inner size Ai2 ;wherein, the outer size Ao2 of the secondary spiral coil is no greater than the outer size Ao1 of the primary spiral coil; and wherein the primary and the secondary spiral coils are sandwiched between soft magnetic foils with insulating layers between the magnetic foils and primary and the secondary spiral coils. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10)
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9. A planar transformer with increased coupling coefficient comprising:
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a primary spiral coil having a first cross-section of primary coil lines with center points lying in a first plane, said primary spiral coil including; an inner size Ai1 of the primary spiral coil, Ai1 being a distance between two inner-most primary coil lines in the first cross-section; an outer size Ao1 of the primary spiral coil, Ao1 being a distance between two outer-most primary coil lines in the first cross-section; a winding width W1 of the primary spiral coil which is half a difference between the outer size Ao1 and the inner size Ai1 ; a secondary spiral coil positioned adjacent to the primary coil and having a second cross-section with secondary coil lines with center points lying in a second plane, parallel to the first plane, said secondary spiral coil including; an inner size Ai2 of the secondary spiral coil being a distance between two inner-most secondary coil lines in the second cross-section; an outer size Ao2 of the secondary spiral coil being a distance between two outer-most secondary coil lines in the second cross-section; a winding width of the secondary spiral coil W2 which is greater than the winding width of the primary spiral coil W1 (W1<
W2), said winding width W2 being half of a difference between the outer size Ao2 and the inner size Ai2 ; andwherein, the inner size Ai1 of the primary spiral coil and the inner size of the secondary spiral coil Ai2 are set equal.
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Specification