JP2001155941A - Choke coil for power supply rectifier circuit and adjustment method thereof - Google Patents

Abstract

[PROBLEMS] To easily adjust the current-inductance characteristics of a choke coil for a power supply rectifier circuit. SOLUTION: An E-shaped core 2 has side legs 2b, 2c on both sides of a center leg 2a and is joined to an I-shaped core 1.
The edge of one end of the I-shaped core is directly abutted on the end face of one side leg 2c, and separate magnetic materials 10 and 11 are attached to the end faces of the central leg 2a and the remaining side leg 2b. The I-shaped core 1 is butted through.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main body core provided with a winding having an I-shaped core and at least two legs having abutting surfaces at both ends of which are abutted. The present invention relates to a choke coil for a power supply rectifier circuit connected to the input side of a capacitor input type power supply rectifier circuit and a method of adjusting the choke coil.

[0002]

2. Description of the Related Art In FIG. 5A, a capacitor input type power supply rectifier circuit in which a smoothing capacitor C1 is provided on the output side of a rectifier circuit and a choke coil Z1 is connected on the commercial power supply input side is shown in FIG. As described above, the current that changes in accordance with the load L1 is supplied in the voltage peak region, and as the load L1 becomes lighter, the time width W becomes a sharp pulse with a narrower time width, and the harmonic component increases. . As a countermeasure against this, it is possible to reduce the harmonic component by increasing the inductance when the load L1 is light by reducing the inductance as the current increases. As such a choke coil, a method of forming a wedge-shaped gap in a core to increase the magnetic resistance as the magnetic flux increases is well known.
Japanese Patent No. 316039 also discloses a choke coil for suppressing a harmonic current in which a stepped gap having a different space width is provided in a core.

[0003]

According to the choke coil using such a core, the structure is simpler than the method using an active filter or the like. It is suitable. However,
In the case of small-scale production, it is necessary to process the core each time to adjust and test the gap to a desired current-inductance characteristic,
Moreover, in that case, a heat treatment may be required again with a magnetic material having a high magnetic permeability. Furthermore, it is difficult to repair a power supply device that has already been used when a problem such as noise disturbance occurs.

The present invention has been made in view of the above points, and
An object of the present invention is to provide a choke coil for a power supply rectifier circuit that can easily adjust inductance characteristics and a method of adjusting the choke coil.

[0005]

In order to achieve this object, the invention provides, according to claim 1, an I-shaped core and at least two legs abutting the I-shaped core,
A main body core with a winding, and a choke coil for a power supply rectifier circuit connected to an AC power supply input side of the rectifier circuit, wherein an edge of one end of the I-type core is attached to an end surface of one leg. It is characterized in that the I-shaped core is butted to the end face of the remaining leg via a separate magnetic material.

[0006] By abutting the edge of one end of the I-shaped core to the end face of one leg, a wedge-shaped gap is formed by the inclined I-shaped core. Between the other end of the I-shaped core and the end face of the remaining leg, through a magnetic material, a gapless or gapped butt is performed depending on the shape. According to the third aspect, when the magnetic material is plate-shaped and one or more of the I-type cores are in contact with each other, at least one wedge-shaped gap is formed between the end surfaces of the remaining legs and the magnetic material. Is done. Inductance initially increases with the amount of magnetic flux due to the initial permeability, and in a wedge-shaped gap, the reluctance increases with the magnetic resistance depending on the wedge shape of the gap contacted or separated at the tip, with the total reluctance combined. It increases with. Therefore, the magnetic resistance can be increased in accordance with the increase in current, and the current level at which saturation occurs can be increased.
The current-inductance characteristics are adjusted to become flat.

According to the second aspect, the main body core is an E-shaped core having side legs on both sides of the central leg, and the central portion of the I-shaped core is abutted to the central leg via a magnetic material.
The characteristics of the EI core can also be adjusted by adjusting the gap of the center leg.

[0008] An I-shaped core and a main body core having at least two legs abutting on the I-shaped core and wound are provided, and are connected to an AC power input side of a rectifier circuit. According to a fourth aspect of the present invention, there is provided a method of adjusting a choke coil for a power supply rectification circuit for adjusting a current-inductance characteristic of the choke coil for a power supply rectification circuit. The material is brought into contact, the edge of one end of the I-shaped core is abutted against the end surface of one leg, and the I-shaped core is abutted on the end surface of the remaining leg via a magnetic material to obtain a desired one. A current-inductance characteristic is obtained.

Thus, the characteristics are adjusted by abutting one or more plate-shaped magnetic materials in contact with the I-shaped core while conducting a test. Claim 5
Accordingly, the main body core is an E-shaped core having side legs on both sides of the center leg, and the I-shaped core is formed from the side leg opposite to the side leg to which the edge of the I-shaped core abuts. One or a plurality of plate-like magnetic materials having a length reaching the leg are brought into contact with the I-shaped core, and then one or a length which cannot reach the central leg from the opposite side leg. By stacking a plurality of plate-like magnetic materials, it is possible to adjust the characteristics of the EI type core by adjusting the gap of the central leg by the contact surface of one or more magnetic materials with the I-type core. is there.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A choke coil according to an embodiment of the present invention and its adjustment will be described with reference to FIGS. This choke coil basically takes into consideration a desired current-inductance characteristic as shown in FIG.
Central leg 2a on which winding 3 is applied and side legs 2 on both sides thereof
E-type core 2 of a laminated iron core as a body core having b and 2c
And an I-shaped core 1 of a laminated iron core. Further, in order to adjust the current-inductance characteristics based on such a core, the magnetic material 10, which is longer than the lateral width of the side leg 2b to secure the taping margin, and between the side leg 2b and the center leg 2a. A large number of magnetic materials 11 that can be bridged, magnetic materials 12 that are relatively short and have a relatively short bridging length, and magnetic materials 13 that are as long as the magnetic materials 11 and are thin are prepared for adjustment. These magnetic materials are made of the same material as the I-shaped core 1 and have a plate shape, that is, a plate shape having a uniform thickness.

When manufacturing a choke coil having desired characteristics, as shown in FIG. 3, the current-inductance characteristics are measured each time and the magnetic materials 10 to 13 are used to connect the I-type core 1 and the E-type core 2 to each other. Adjust the gap between the butting surfaces. The characteristics of the standard type core 1A of FIG. 2A are indicated by the symbol A in the figure. In this case, the inductance is small and gradually increases in the rising region of the current, and when the current increases to some extent, the inductance is rapidly reduced due to saturation of the core 1A. Hereinafter, the gap-adjusted core 1 shown in FIGS. 2B to 2E will be described.
The characteristics of A are indicated by symbols BF in the figure.

As shown in FIG. 1B, first, the magnetic material 10 is aligned with the end of the E-shaped core 1, wound around a tape 18, and temporarily fixed in a state of contact with the E-shaped core 1. Is butted to the side leg 2c and to the side leg 2b via the magnetic material 10. In this case, a completely separated gap 19 is formed between the center legs 2a, so that the magnetoresistance is rapidly increased, and a flattened current-inductance characteristic is obtained with a small maximum inductance. As shown in FIG. C, when two sheets are stacked, the surface is further flattened with a smaller maximum inductance.

As shown in FIG. 1D, the magnetic material 11 is brought into contact with the I-shaped core 1 and then the magnetic material 10 is superposed on the I-shaped core 1.
Of the wedge-shaped gap 19 is brought into contact with the center leg 2a.
a is formed. In this case, the wedge-shaped gap 1 of the side leg 2b
9b and the wedge-shaped gap 19c of the side leg 2c together with the wedge-shaped composite gap at the tip contact are formed. The inductance decreases slightly due to the edge butting, and the magnetic flux density of the core 1A with respect to the current increase due to the increase of the current due to the interposition of the wedge-shaped gap. The level of increase is reduced, and the saturation current level is higher than in the standard core 1A of FIG. 2A.

As shown in FIG. 1E, the magnetic material 12 is further overlapped, its edge is brought into contact with the central leg 2a, and its wedge-shaped gap is made two pieces with a small separation distance, so that the tip contact 4 is formed. The adjustment amount can be further reduced by the wedge-shaped gap of the individual composition.

As shown in FIG. 2F, the magnetic material 13 is brought into contact with the center of the I-shaped core 1 and the distance between the center legs 2a is reduced, so that the center of FIG. Characteristic can be adjusted.

These gaps can be replaced with one wedge-shaped gap formed by processing the I-shaped core 1 so as to exhibit equivalent characteristics.
5 and the like, the I-type core 1 shown in FIG.
Can be adjusted to a characteristic corresponding to the wedge-shaped gap. That is, as shown in FIG. 3A, the tip of the magnetic material 14 slightly abuts against the center leg, so that the inductance can be rapidly reduced when the current increases (see the dotted line in FIG. 3). ). As shown in FIG. B, the magnetic material 15 can be interposed halfway through the center leg 2a, and can be adjusted so that the inductance is rapidly reduced when the current increases to some extent (see the dashed line in FIG. 3). .

When a characteristic close to a desired characteristic is obtained in the core 1A of FIG. 2D, which has a somewhat large current level at which the inductance is reduced and the saturation level is increased as the current gradually increases, as shown in FIG. The members 10 and 11 are fixed at their protruding portions with a tape 22,
Then, tap the I-shaped core 1 on the E-shaped core 2
It is fixed in a state where it is tilted and abutted with the intervention of 0 and 11. Next, unlike the normal abutting state, the both ends of the I-shaped core 1 are not abutted in a contact state, so that a flexible magnetic material 23 is joined to these outer peripheral surfaces to prevent magnetic flux leakage. At the same time, the right and left heights are aligned to facilitate fixing. Furthermore, it is impregnated with a varnish and fixed with a fixing frame (not shown).

When the characteristics of the choke coil in use are adjusted as required by the same method, the I-type core and the main body core are separated from each other, and an adjustment test is performed by using a plurality of types of prepared magnetic materials. Confirm that the characteristics can be obtained, and then butt again with a magnetic material interposed.

The above-mentioned plate-shaped magnetic material may be laminated,
The present invention is also applied to a choke coil using a U-shaped core as a main body core. Various shapes can be considered for the separate magnetic material for adjustment.

[0020]

According to the first and second aspects of the present invention, a choke coil with a combined core whose current-inductance characteristics are adjusted by a butt gap can be realized without performing gap machining on the core. According to the third aspect of the present invention, since the separate magnetic material has a plate shape, a plurality of types can be easily manufactured, and the choke coil can be easily adjusted. According to the fourth and fifth aspects of the present invention, the current-inductance characteristics can be easily adjusted simply by abutting one or more plate-shaped magnetic materials on the I-shaped core and in contact with each other. A method is implemented. The choke coil already in use can be repaired by performing an adjustment test.

[Brief description of the drawings]

FIG. 1 is a perspective view of a choke coil being manufactured according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an adjustment method using a magnetic material of the choke coil.

FIG. 3 is a diagram showing current-inductance characteristics in an adjustment stage according to FIG. 2;

FIG. 4 is a diagram illustrating an adjustment method of the choke coil using still another magnetic material.

5A and 5B illustrate a general power supply rectifier circuit with a choke coil. FIG. 5A is a diagram illustrating the circuit configuration, and FIG. 5B is a diagram illustrating the operation thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 I-type core 2 E-type core 2a Central leg part 2b, 2c Side leg part 10-15 Plate-shaped magnetic material 19-19c Gap

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01F 27/24 J

Claims (5)

[Claims] 1. A rectifier circuit comprising: an I-shaped core; and a main body core having at least two legs abutting on the I-shaped core and being wound, and connected to an AC power input side of a rectifier circuit. In the choke coil for a power supply rectifier circuit, the edge of one end of the I-shaped core is abutted against the end face of one leg, and the I-core is connected to the end face of the other leg via a separate magnetic material. A choke coil for a power supply rectifier circuit, characterized by abutting die cores. 2. The main body core is an E-shaped core having side legs on both sides of a center leg, and the center of the I-shaped core is abutted to the center leg via a magnetic material. The choke coil for a power supply rectifier circuit according to claim 1. 3. The choke coil for a power supply rectifier circuit according to claim 1, wherein the magnetic material has a plate shape, and one or a plurality of magnetic materials are superposed on and contact with the I-shaped core. 4. An rectifier circuit comprising: an I-type core; a body core having at least two legs abutting on the I-type core; A method of adjusting a choke coil for a power supply rectifier circuit for adjusting a current-inductance characteristic of a choke coil for a power supply rectifier circuit, comprising: an I-shaped core having one or more plate-shaped magnetic materials in contact with the I-shaped core; Then, the edge of one end of the I-shaped core is abutted against the end face of one leg, and the I-shaped core is abutted against the end face of the other leg via the magnetic material to obtain a desired current-inductance. A method for adjusting a choke coil characterized by obtaining characteristics. 5. The main body core is an E-shaped core having side legs on both sides of a central leg, and a side leg opposite to the side leg with which the edge of the I-shaped core abuts on the I-shaped core. One or a plurality of plate-like magnetic materials having a length reaching the central leg from the portion may be brought into contact with the I-shaped core, and then reach the central leg from the opposite side leg. 5. The method for adjusting a choke coil according to claim 4, wherein one or a plurality of plate-shaped magnetic materials having different lengths are overlapped.