JPH0672218U - High frequency coil - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce both the skin effect and proximity effect (eddy current) at the same time, and to achieve miniaturization equivalent to the use of a rectangular wire. A coil formed by continuously knitting a plurality of assembly lines U1, U2, U3 ... In such a manner that each assembly line U1 ... Displaces alternately to the inside Pi and the outside Po so that the outer shape approximates a rectangular wire. It is formed by winding the wire material 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high frequency coil suitable for use in a high frequency switching power supply transformer or the like.

[0002]

[Prior art and problems]

 Conventionally, a transformer for a high-frequency switching power source that inputs and outputs a low voltage and a large current (several hundred amperes) is known, but the coil (winding part) used in this type of transformer is used for a large current, and For the purpose of miniaturization as much as possible, it is not uncommon to make flat rectangular wire with high occupancy efficiency.

By the way, the coil using such a rectangular wire has a problem that the amount of current flowing through the coil is limited by the skin effect due to the high frequency current. For this reason, a coil is used in which the skin effect is reduced by using a composite wire made up of many wires. However, even a coil using such a composite wire does not solve the problem of proximity effect due to high-frequency magnetic field and eddy current, and therefore, for example, there is a problem of abnormal heat generation due to non-uniformity of current distribution in the wire. there were.

The present invention solves the above-mentioned problems existing in the prior art, and is capable of simultaneously reducing both the skin effect and the proximity effect (eddy current), and in addition, it has a small size equivalent to that of using a rectangular wire. An object of the present invention is to provide a high-frequency coil capable of achieving high efficiency.

[0005]

[Means for Solving the Problems]

 In the high frequency coil 1 according to the present invention, a plurality of assembly lines U1, U2, U3 ... Are knitted so that each assembly line U1 ... It is characterized in that it is formed by winding a coil wire material 2 which is continuously formed so as to be approximated. In this case, the assembly lines U1 ... Are composed of an assembly material of a plurality of insulated single wires C.

[0006]

[Action]

 According to the high frequency coil 1 of the present invention, since it is basically a combination of a plurality of insulated single wires C ... Assembling wires U1. .

In addition, since the coil wire material 2 is continuously formed so that the outer shape approximates to a rectangular wire by knitting a plurality of assembly wires U1, ..., A rectangular wire is formed in terms of shape. As a result, the occupancy efficiency in the coil configuration is improved. Further, since each assembly line U1 ... Is knitted so as to be dislocated to the inner Pi and the outer Po alternately, the current distribution in each assembly line U1 ... Is made uniform, and the adverse effect due to the proximity effect (eddy current) is reduced.

[0008]

【Example】

 Next, a preferred embodiment according to the present invention will be described in detail with reference to FIGS.

First, a large number of assembly lines U1, U2, U3 ... In which a plurality of insulated single wires C ... Then, the coil wire material 2 having an outer shape similar to a rectangular wire is continuously formed by knitting the assembly lines U1. In this case, the assembly lines U1 ... Are knitted so as to be dislocated alternately to the inside Pi and the outside Po of the coil wire material 2. That is, FIG. 4 shows the coil wire material 2 linearly expanded, but one gathering line U1 is zigzag so as to alternately pass the inside Pi and the outside Po in the rectangular wire (coil wire material 2). Knit into FIG. 3 shows a stitch pattern after weaving the assembly lines U1 ...

Further, FIGS. 1 and 2 show a high frequency coil 1 having an inner diameter Y formed by winding a coil wire material 2 having a width X. In this case, if X << Y, FIG. Although it may be manufactured by winding the coil wire material 2 which has been previously knitted in a straight line as shown in, the coil wire material 2 is directly knitted so that the coil wire material 2 has a circular solenoid shape under conditions other than X << Y. increase. Then, the continuously formed coil wire material 2 is cut into a desired length (number of turns), insulation at both ends is removed, and a pair of connection terminals (connection fittings) 3 and 4 are attached and fixed. In this case, since both ends of the coil wire material 2 have flexibility, it is possible to extremely easily perform processing of both ends, connection, etc., as compared with a normal rectangular wire. Reference numerals 5 and 6 denote fixing bands for fixing the wound coil wire material 2. The high frequency coil 1 is configured as described above.

Therefore, since the high frequency coil 1 according to the present embodiment basically combines the aggregated wires U1 ... Consisting of the aggregated material of a plurality of insulated single wires C ..., the adverse effect due to the skin effect is reduced. At the same time, since the assembly lines U1 ... Are knitted so as to be alternately displaced to the inside Pi and the outside Po, the current distribution in each assembly line U1 ... Is made uniform and the adverse effects due to the proximity effect and the eddy current are reduced. Further, since the coil wire material 2 whose outer shape is close to a rectangular wire is continuously formed by knitting a plurality of assembly wires U1, ..., A rectangular wire is formed in terms of shape, and thereby the occupancy efficiency in the coil configuration is improved. It is raised and miniaturized.

Although the embodiments have been described in detail above, the present invention is not limited to such embodiments, and the details of the configuration, shape, material, quantity, etc. do not depart from the gist of the present invention. Can be changed arbitrarily.

[0013]

[Effect of device]

 As described above, the high-frequency coil according to the present invention is formed by continuously knitting a plurality of assembly lines so that the assembly lines are alternately displaced inward and outward, so that the outer shape approximates a rectangular wire. Since the coil wire material is wound, both the skin effect and the proximity effect (eddy current) can be reduced at the same time, and in addition, the size reduction equivalent to that of using the rectangular wire can be achieved.

[Brief description of drawings]

FIG. 1 is a plan view of a high frequency coil according to the present invention,

FIG. 2 is a perspective view of the high-frequency coil,

FIG. 3 is a pattern diagram of stitches of the high frequency coil,

FIG. 4 is a development view for explaining the high frequency coil,

[Explanation of symbols]

 1 High-frequency coil 2 Coil wire material U1 ... Assembly line C Single line Pi inside Po Outside

Claims (2)

[Scope of utility model registration request] 1. A coil wire material, which is continuously formed so that the outer shape approximates a rectangular wire by knitting a plurality of assembly lines so that the assembly lines are alternately displaced inward and outward. High frequency coil characterized by. 2. The high frequency coil according to claim 1, wherein the assembly wire is an assembly material of a plurality of insulated single wires.