Patent ID: 8400250

Claim:
A combined type of transformer comprising: two windings; a transformer core including a transformer magnetic leg portion around which the windings are wound, the transformer magnetic leg portion extending in the axial direction of the windings; two inductor cores disposed in the axial direction, each including an inductor magnetic leg portion around which one of the windings is wound and being disposed next to the transformer core, wherein when at least one of the windings is conducted, a magnetic flux is generated at the transformer magnetic leg portion and the inductor magnetic leg portions, which provides functions of a transformer and inductors, wherein the transformer core comprises: the transformer magnetic leg portion; a transformer outer magnetic leg portion extending in parallel to the transformer magnetic leg portion, disposed outside an outer circumferential surface of the windings; and a pair of transformer bases respectively connecting ends of the transformer magnetic leg portion and ends of the outer magnetic leg portion; wherein each of the inductor cores comprises: the inductor magnetic leg portion; an inductor outer magnetic leg portion extending in parallel to the inductor magnetic leg portion, disposed outside an outer circumferential surface; and a pair of inductor bases respectively connecting ends of the inductor magnetic leg portion and ends of the inductor outer magnetic leg portion, and wherein the windings are wound to generate magnetic fluxes in such directions that the magnetic fluxes are cancelled out in a magnetic closed circuit in the transformer core.