Patent ID: 7808355

Claim:
A combined type transformer comprising: primary and secondary coils; a single transformer core having said primary and secondary coils wound therearound; and at least one inductor core provided in correspondence with at least one of said primary and secondary coils, wherein said transformer core and said inductor cores are formed of different materials, wherein each of said primary and secondary coils has a projecting coil portion that projects outwardly from at least one side surface of said transformer core, wherein said at least one inductor core includes first and second inductor cores provided in respective ones of the projecting coil portions of the primary coil, and third and fourth inductor cores provided in respective ones of the projecting coil portions of the secondary coil, wherein said transformer core and said primary and secondary coils constitute a transformer, the primary coil and said first and second inductor cores constitute a first inductor, and the secondary coil and said third and fourth inductor cores constitute a second inductor, and wherein said transformer core has a middle magnetic path portion and side magnetic path portions located at both sides of the middle magnetic path portion, and wherein said primary coil is provided in an upper region of the middle magnetic path portion, while said secondary coil is provided in a lower region of the middle magnetic path portion.