Transformer and power converter
An object is to improve a core and heat radiation properties from the coil, and to reduce the size of a transformer. In order to attain the object described above, a transformer includes a bobbin wound around with a coil, a columnar core center portion in which the bobbin is mounted, and a plurality of core leg portions joining both ends of the core center portion on the outside of the coil. The size of the core leg portion is larger than the size of the other core leg portions, and the core leg portion includes a flat outer circumferential surface approximately parallel to a surface which is tangent to an outer circumferential side surface of the coil. The transformer is disposed in a housing such that the outer circumferential surface of the core leg portion is tangent to a floor surface of the housing.
1. A transformer comprising:
a coil configured by winding a conductive wire into a shape of a spiral cylinder;
a core center portion having a columnar shape in which the coil is mounted; and
a plurality of core leg portions joining both ends of the core center portion on the outside of the coil,
wherein the transformer is disposed in a storage housing in a state in which a central axis of the core center portion is approximately parallel to a floor surface of the storage housing on which the transformer is mounted,
wherein the transformer is disposed in the storage housing such that one core leg portion of the plurality of core leg portions includes a flat outer circumferential surface approximately parallel to a tangential plane which is tangent to an outer circumferential side surface of the coil having a spiral cylindrical shape, and the outer circumferential surface of the one core leg portion is tangent to the floor surface of the storage housing, and the outer circumferential surface of the one core leg portion adheres to the floor surface of the storage housing through a high thermal conducting material.
2. The transformer according to claim 1 ,
wherein a size of the one core leg portion is larger than a size of the core leg portion of the plurality of core leg portions, which is different from the one core leg portion.
3. The transformer according to claim 1 ,
wherein at least one core leg portion of the plurality of core leg portions, which is different from the one core leg portion, includes a flat outer circumferential surface approximately parallel to a tangential plane which is tangent to an outer circumferential side surface of the coil having a spiral cylindrical shape, and a heat radiation fin is disposed on the outer circumferential surface.
4. The transformer according to claim 1 ,
wherein a high thermal conducting material is interposed between an inner wall of the coil having a spiral cylindrical shape and an outer wall of the core center portion in which the coil is mounted.
5. The transformer according to claim 1 ,
wherein of four terminals which are respectively connected to a primary coil and a secondary coil configuring the coil, two terminals are disposed on one end surface side of the coil, and two other two terminals are disposed on an other end surface side of the coil.
6. A power converter comprising:
a transformer including a coil configured by winding a conductive wire into a shape of a spiral cylinder, a core center portion having a columnar shape in which the coil is mounted, and a plurality of core leg portions joining both ends of the core center portion on the outside of the coil;
a storage housing in which the transformer is mounted on a floor surface; and
a fan which is disposed on a side surface portion of the storage housing and blows cold air to the transformer,
wherein the transformer is disposed in the storage housing such that a central axis of the core center portion is approximately parallel to the floor surface of the storage housing on which the transformer is mounted and a direction of the central axis of the core center portion is identical to a direction of the cold air blown from the fan, wherein the transformer is disposed in the storage housing such that one core leg portion of the plurality of core leg portions includes a flat outer circumferential surface approximately parallel to a tangential plane which is tangent to an outer circumferential side surface of the coil having a spiral cylindrical shape, and the outer circumferential surface of the one core leg portion is tangent to the floor surface of the storage housing, and wherein the outer circumferential surface of the one core leg portion adheres to the floor surface of storage housing through a high thermal conducting material.
7. The power converter according to claim 6 ,
wherein a size of the one core leg portion is larger than a size of the core leg portion of the plurality of core leg portions, which is different from the one core leg portion.
8. The power converter according to claim 6 ,
wherein at least one core leg portion of the plurality of core leg portions, which is different from the one core leg portion, includes a flat outer circumferential surface approximately parallel to a tangential plane which is tangent to an outer circumferential side surface of the coil having a spiral cylindrical shape, and a heat radiation fin is disposed on the outer circumferential surface.
9. The power converter according to claim 6 ,
wherein a high thermal conducting material is interposed between an inner wall of the coil having a spiral cylindrical shape of the transformer and an outer wall of the core center portion in which the coil is mounted.
10. The power converter according to claim 6 ,
wherein of four terminals which are respectively connected to a primary coil and a secondary coil configuring the coil of the transformer, two terminals are disposed on one end surface side of the coil, and two other two terminals are disposed on an other end surface side of the coil.