| 摘要 |
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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