JP2000012351A - Composite inductance element and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a manufacturing process by forming a first inductance element at a magnetic material core, covering a pot-type core on the first inductance, and attaching a second inductance element to the outer periphery of the pot-type core. SOLUTION: Coils 12a and 12b are wound in a coil groove of an magnetic material core 11. The magnetic material core 11 is mounted on a terminal stage 16 comprising a plurality of terminals. A bottomed pot-type core 13 is so covered over the core 11 that the coils 12a and 12b are covered. Related to the pot-type core, a hollow part is formed so that the magnetic body core is housed using such magnetic material as ferrite, with a flange 14 provided at the lower end of the side wall. Related to the pot-type core 13. The upper surface of the inside of it is bonded to the upper surface of an upper flange of the core 11 using a bonding agent, with a choke coil formed by winding a coil 15 in air-core-like attached on the outside periphery. The choke coil is positioned by the flange 14 of the hot-core type 13 and fixed with a bonding agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a composite inductance element in which a plurality of inductance elements such as a transformer and a choke coil are integrally formed.

[0002]

2. Description of the Related Art In a functional circuit such as a power supply circuit, a plurality of inductance elements such as a transformer and a choke coil are often used in the same circuit. For example, the transformer and the choke coil are functionally different from each other, but in order to reduce the number of parts of the electronic device incorporating the functional circuit, FIG.
There is a composite inductance element integrated as shown in FIG.

In the composite inductance element shown in FIG. 3, a drum core 31 made of a magnetic material is mounted on a terminal block 36 having a plurality of terminals, and windings 32 a and 32 b forming a transformer are formed in winding grooves of the drum core 31. The pot-shaped core 33 made of a magnetic material is covered so as to cover the core 31, and a winding 35 forming a choke coil is wound around a winding groove of the pot-shaped core 33.

[0004]

In the composite inductance element shown in FIG. 3, the pot type core 33 is made of a drum core 3 in order to reduce the magnetic coupling between the transformer and the choke coil.
Covered with 1. The pot-shaped core 33 has a winding groove formed by providing a flange on a side wall in order to wind a winding 35 for forming a choke coil. In this composite inductance element, a winding 32a is provided around a drum core 31;
After winding 32b, the pot-shaped core 33 is adhered to the core 31, and the winding 35 is wound around the winding groove of the pot-shaped core 33. In such a conventional composite inductance element, a winding is wound around a drum core using a winding device, once removed from the winding device, a pot-shaped core is adhered to the drum core, and then the pot is again formed using the winding device. Since the winding must be wound around the core, the winding cannot be wound around the pot core until the adhesive bonding the pot core and the drum core has hardened, complicating the manufacturing process. However, there is a problem that the manufacturing cost increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a composite inductance element capable of simplifying a manufacturing process and a method for manufacturing the same.

[0006]

According to the composite inductance element of the present invention, a pot-shaped core is formed so that a first inductance element is formed by winding a winding around a magnetic core and the first inductance element is covered. A second inductance element, which is formed by winding a coil around the pot-shaped core to form an air core, is mounted on the outer periphery of the pot-shaped core. In the method for manufacturing a composite inductance element according to the present invention, a first step of forming a first inductance element by winding a winding around a magnetic core is performed. A second core is formed by covering the core and winding the winding in an air core shape.
A second step of fitting the above inductance element to the outer periphery of the pot-shaped core.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a composite inductance element according to the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view of a first embodiment of the composite inductance element according to the present invention. In FIG. 1, reference numeral 11 denotes a magnetic core, 12a, 1
2b and 15 are windings, 13 is a pot-shaped core, and 16 is a terminal block. The magnetic core 11 is formed of a magnetic material such as ferrite, and a so-called drum core in which a disk-shaped flange is provided at both ends of a cylindrical winding shaft and a winding groove is formed between the flanges is used. In the winding groove of the magnetic core 11, windings 12a, 12b
To form a transformer. This magnetic core 11
Is mounted on a terminal block 16 having a plurality of terminals. The magnetic core 11 is covered with a bottomed pot-shaped core 13 so as to cover the windings 12a and 12b. The pot-shaped core 13 has a hollow portion formed by using a magnetic material such as ferrite so that the magnetic core can be housed, and a flange 14 is provided at a lower end of a side wall. In the pot-shaped core 13, an inner upper surface and an upper surface of an upper flange of the magnetic core 11 are bonded with an adhesive, and a choke coil formed by winding a winding 15 in an air core shape around the outer periphery is mounted. . The choke coil is positioned by the flange 14 of the pot-shaped core 13 and is fixed with an adhesive so as not to come off from the pot-shaped core 13. The lead of this transformer and the lead of the choke coil are connected to the terminal block 1
6 predetermined terminals.

[0008] This composite inductance element is manufactured by the following method. First, the windings 12a, 1a are formed in the winding grooves of the magnetic core 11 fixed to the terminal block 16 using a winding device or the like.
2b is wound, and the leads of the windings 12a and 12b are connected to predetermined terminals. Next, the pot-shaped core 13 is bonded to the magnetic core 11 and
A choke coil formed by winding the winding 15 in an air core shape in advance is fitted around the outer periphery of 3. The lead wire of the winding 15 is connected to a predetermined terminal of the terminal block 16.

FIG. 2 is a sectional view of a second embodiment of the composite inductance element according to the present invention. The magnetic core 21 is provided with flanges at both ends of a winding shaft, a winding groove is formed between the flanges, and a transformer is formed by winding the windings 22a and 22b in the winding groove. The magnetic core 21 is mounted on a terminal block 26 having a plurality of terminals. The magnetic core 21 is provided with a winding 22
The bottomed pot-shaped core 23 is covered so that a and 22b are covered. The pot-shaped core 23 has a hollow portion so that the magnetic core can be stored using a magnetic material such as ferrite. The pot-shaped core 23 is covered with the magnetic core 21, and a choke coil formed by winding a winding 25 in an air core shape around the outer periphery is mounted. The choke coil is positioned by the terminal block 26 and fixed so as not to come off the pot-shaped core 23. The lead of the transformer and the lead of the choke coil are connected to predetermined terminals of the terminal block 26, respectively.

Although the embodiment of the composite inductance element of the present invention has been described above, the present invention is not limited to the above-described embodiment. For example, although the case where the transformer and the choke coil are formed integrally in the embodiment has been described, a plurality of inductance elements each functioning as a separate element in the circuit, such as a coil and a choke coil, a transformer and a choke transformer, are formed integrally. You may. Also, the magnetic core is attached to the terminal block after the winding is wound using a winding device,
The winding leads may be connected to the terminals of the terminal block. Further, when the choke coil is formed by using a winding having a large wire diameter, it can be prevented from being detached from the pot-shaped core by a lead tied to the terminal, so that the choke coil does not need to be bonded with an adhesive.

[0011]

As described above, the composite inductance element according to the present invention is a second inductance element formed by winding a winding in the form of an air core around the outer periphery of a pot-shaped core having no winding groove. Is attached, so that there is no need to wind a coil around the pot-shaped core using a conventional winding device, and when the pot-shaped core is bonded to the magnetic core of the first inductance element, A second inductance element formed in advance in an air core shape is fitted on the outer periphery of the core. Therefore, the composite inductance element of the present invention does not need to interrupt the operation until the adhesive bonding the pot-shaped core and the magnetic core is hardened as in the related art, and the manufacturing process can be simplified. Further, according to the method for manufacturing a composite inductance element of the present invention, the pot-shaped core is placed on the magnetic core so that the first inductance element is covered, and the second winding is formed by winding the winding in an air core shape. The step of fitting the above-mentioned inductance element to the outer periphery of the pot-shaped core is provided, so that the manufacturing process can be simplified as compared with the case where the winding is wound around the pot-shaped core using a conventional winding device.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment of a composite inductance element according to the present invention.

FIG. 2 is a sectional view of a composite inductance element according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a conventional composite inductance element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Magnetic core 12a, 12b, 15 Winding 13 Pot type core 16 Terminal block

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H01F 31/00 T

Claims (3)

[Claims] 1. A first inductance element is formed by winding a winding around a magnetic core, and a pot-shaped core is covered so as to cover the first inductance element. A second winding formed by winding the winding in an air core shape
A composite inductance element, wherein the inductance element is mounted. 2. The composite inductance element according to claim 1, wherein a flange for positioning the second inductance element is provided on a side wall of the pot-shaped core. 3. A first step of winding a winding around a magnetic core to form a first inductance element, placing a pot-shaped core on the magnetic core so as to cover the first inductance element, A second inductance element formed by winding a winding into an air core shape is fitted on the outer periphery of the pot-shaped core.
A method for manufacturing a composite inductance element, comprising the steps of: