COIL DEVICE, COMPOSITE COIL DEVICE AND TRANSFORMER DEVICE

摘要

A transformer-type compact and thin coil device having a high coupling degree between a primary coil and a secondary coil, and a transformer device in which a plurality of sets of the transformer-type coil devices are incorporated, are provided. A coil device (1) includes a first winding portion (2) in which a primary coil wire (5) and a secondary coil wire (6) are wound in bifilar form so as to arrange them alternately in a plane, a second winding portion (3) in which a secondary coil wire (6) is wound so as to arrange it in a plane in parallel to the plane of the first winding portion, and a secondary coil connecting portion (4) which connects an inner diameter portion of the secondary coil wire in the first winding portion to an inner diameter portion of the secondary coil wire in the second winding portion. A transformer device (50) is formed by incorporating a plurality of sets of the transformer-type coil devices (1) each formed in above manner.