JPH0566936U - Plane coil - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the planar coil from increasing in size and to suppress the temperature rise. [Structure] The width of the inner conductor of the spiral conductor is made larger than that of the outer conductor.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a plane coil used for a transformer or a choke.

[0002]

[Prior Art]

 FIG. 3 shows an exploded perspective view of a conventional thin transformer using a planar coil. A plan view of the conventional planar coil is shown in FIG. The planar coil 11 is formed by forming a spiral conductor 13 on an insulator 12, and 15 is a hole into which a core is inserted. A required number of flat coils 11 are stacked and sandwiched by a pair of ferrite cores 14 to form a thin transformer. As this plane coil, there are various structures such as a single-sided or double-sided printed coil, a copper plate punched coil, and the number of turns is appropriately set. Also, in this planar coil, the conductor width was the same from the inside to the outside.

[0003]

[Problems to be solved by the device]

 In this conventional planar coil, the heat generated in the inner part was large and the temperature rise was large. In this planar coil, the part where the maximum temperature rises becomes a problem, so the heat generation in this inner part was a constraint on its use. To control this temperature rise, heat generation can be reduced by increasing the conductor cross-sectional area, but there is a problem that the plane coil becomes larger when the conductor cross-sectional area is increased. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a planar coil capable of reducing the temperature rise without increasing the size.

[0004]

[Means for Solving the Problems]

 According to the present invention, in a planar coil in which conductors are arranged spirally on an insulating plate, the width of the inner conductor of the spiral conductor is made larger than the width of the outer conductor. In the present invention, the inner conductor width is increased and the conductor cross-sectional area is increased, so that it is possible to reduce the temperature rise on the inner side where heat is easily generated.

[0005]

【Example】

 A plan view of an embodiment according to the present invention is shown in FIG. In this embodiment, the widths of the inner conductor 1, the outer conductor 2 and the conductor 3 in the middle thereof are changed so that the conductor 3 in the middle is thicker than the conductor 2 in the outer side and The conductor 1 is thickened. As a result, the temperature rise could be reduced by 5% as compared with the conventional planar coil. The outer dimensions of the planar coil of this embodiment are the same as the conventional one.

[0006]

[Effect of the device]

 According to the present invention, the temperature rise can be reduced and the range of use of the planar coil can be expanded without increasing the size of the planar coil. In addition, the temperature rise of transformers, chokes, and other components that use planar coils can be suppressed, and the range of components used can be expanded and reliability can be improved.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment according to the present invention.

FIG. 2 is a plan view of a conventional example.

FIG. 3 is an exploded perspective view of a thin transformer using a plane coil.

[Explanation of symbols]

 1, 2, 3 conductors 11 planar coil 12 insulating plate 13 conductor 14 ferrite core 15 holes

Claims (1)

[Scope of utility model registration request] 1. A flat coil having a spirally arranged conductor on an insulating plate, wherein a width of a conductor inside the spiral conductor is larger than a width of an outer conductor. ..