JP2000223330A - Line-filtering reactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized line filter by reducing a board for mounting a plurality of capacitors and a reactor in the line filter structured thereby. SOLUTION: In a line filter constituted by a plurality of capacitors 7 and a reactor, an arbitrary number of the plurality of capacitors 7 or a shaped composite capacitor is disposed surrounding an annular iron core 6 constituting the reactor to wind a coil, thereby preparing the reactor mounted internally with the capacitor 7. The reactor is mounted on a board an wired for manufacturing the small-sized line filter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line filter reactor used for a line filter for preventing electromagnetic noise generated from a power converter such as an electronic device or an inverter and electromagnetic noise flowing from a power supply. is there.

[0002]

2. Description of the Related Art The magnetic material of a reactor used for a power line filter shown in the circuit diagram of FIG. 1 has a ring-shaped iron core, and a conductor wound around the core is formed by twisting a round wire for a small current. A single wire is used, and a flat wire is often used for large currents. As the capacitor constituting the filter, a round or flat shape of a so-called film capacitor obtained by winding a ceramic capacitor or a plastic film and a metal foil and attaching a lead wire is used.

For wiring and connection, a printed board is used, and components such as a reactor, a capacitor, and input and output terminals are mounted and soldered to form a line filter. For the reactor, two coils are used for single-phase and three coils are used for three-phase. However, since these coils are wound two or three times on a single annular iron core, the size of the reactor is large. Does not change. On the other hand, a large number of individual capacitors are used, and as shown in FIG. 2, the number of individual capacitors is arranged on the plane of the printed board.

[0004]

In the above configuration, the capacitors, which are individual components, are mounted on the plane of the printed circuit board in a number corresponding to the number of components, so that assembly is complicated, and other components such as reactors, input and output terminals, etc. Since the board area is considerably large compared to the occupied mounting area, it is difficult to reduce the size of the line filter. The present invention has been proposed in view of the above, and an object of the present invention is to reduce the mounting area of a capacitor, which is an individual component, to reduce the size of a filter, and to reduce the number of assembly steps.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is to arrange an arbitrary number of capacitors constituting a filter along an annular iron core formed by winding a magnetic alloy ribbon. A line filter is formed using a reactor in which a conductor is wound and a capacitor is provided. The second invention is characterized in that the arbitrary number of capacitors are curved individual or composite capacitors. Third
Is characterized in that the arbitrary number of capacitors are cylindrical composite capacitors. The fourth invention is characterized in that the arbitrary number of capacitors is a hollow disk-shaped composite capacitor. The fifth invention is characterized in that the arbitrary number of capacitors is an arbitrary combination of a curved individual or composite capacitor, a hollow disk-shaped composite capacitor, and a cylindrical composite capacitor. Hereinafter, the present invention will be described in detail. The annular iron core is formed by winding a magnetic alloy ribbon. As the magnetic alloy ribbon, it is desirable to use an amorphous nanomicron crystal alloy ribbon having cobalt, iron, copper, or the like, and to perform a heat treatment in a magnetic field after winding to improve magnetic properties.

[0006]

The annular case for accommodating the annular iron core has a rectangular cross section, and the annular iron core and a storage portion for the individual or composite capacitor are provided therein.
Insert the capacitor terminal lead through holes where necessary in the upper case. If a slit is provided from this insertion hole to the end of the case, and the lead is inserted into the slit and moved to the insertion hole, the work of inserting the lead into the case hole is eliminated, and workability is improved. Furthermore, since the coil is wound in an annular shape, the inner circumference is narrower and the outer circumference is wider between the coil wires, so the capacitor is arranged on the outer circumference of the annular iron core, and the terminal leads of the capacitor are arranged so as to be between the wires on the outer circumference of the coil. Is preferred.

[0007]

The upper and lower cases are provided with a fitting portion and fitted together, or the upper case is fitted and then fixed with an adhesive. Further, it is desirable to provide a ventilation hole for releasing internal heat. The case is one in which a space for accommodating the capacitor is integrally provided around the annular iron core, in addition to the upper and lower cases, the inner and outer cases can be detachably combined, or the annular iron core and the hollow circle Prepare a hollow disk-shaped insulating spacer with a plate-shaped capacitor if necessary. In addition, it is desirable to round the corner of the case because it is wound, and there is a simple method of arranging a capacitor around an insulated annular iron core and fixing it with a heat-shrinkable tube or an insulating adhesive tape. The case is made of various insulating materials such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), liquid crystal polymer (LCP), and polyphenylene sulfide (PPS).
Those having solder heat resistance are desirable.

[0008] The individual capacitor may be a ceramic capacitor, or may be formed by laminating two plastic films, such as PET and PPS, on which a thin metal film is deposited, and rolling them together. And then soldering the lead wires.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the case of claim 2, a small plastic film capacitor is a round shape, and a large one such as a composite product is a flat shape pressed with a curved shape in accordance with a case storage portion. Further, it is necessary to make the number of windings constant so that the thickness of each capacitor is constant, and to change the diameter of the winding core in accordance with the capacitance value and wind it up. If the heat generated by the energization of the reactor is large, it is preferable to use a ceramic capacitor having good heat resistance.

In the case of the third aspect, in the case of the cylindrical composite capacitor housed outside the annular iron core, after winding the plastic film capacitor with the case itself as the winding core, the annular iron core is housed in the same case. FIG. 3 shows a sectional view. Similarly, a cylindrical composite capacitor housed in the inner periphery of an annular iron core is wound around a case (not shown) fitted inside the annular iron core case as a bobbin of the capacitor and fitted inside the annular iron core case. .

Alternatively, the dielectric ceramic green sheet is punched in a strip shape for the inside or outside of the annular iron core in consideration of the shrinkage rate after firing, and a composite electrode is printed and a predetermined number of layers are laminated and pressed. Then, it is rolled into a cylinder and fired to form a cylindrical composite ceramic capacitor. Alternatively, the green sheet may be punched into one long strip, printed with a composite electrode, superposed on the green sheet for interlayer insulation, and fired in multiple layers.

In the case of the fourth aspect, the hollow disk-shaped composite capacitor housed in a state of being stacked on the annular iron core is formed by firing a green sheet of a barium titanate-based dielectric ceramic having a predetermined dielectric constant by about 20%. Taking into account the subsequent shrinkage, punching is performed into a hollow disk with dimensions after firing that match the case, composite electrodes are printed, laminated and pressed, and then integrally fired and lead attached.
In addition, on a sintered ceramic substrate in the form of a hollow disk, a paste is prepared by mixing a glass powder and an organic binder with a dielectric ceramic powder, and the multilayer pattern is alternately printed with an electrode pattern using a conductor paste, and integrally fired at 1000 ° C or less. A composite capacitor substrate can also be used.

In the case of the fifth aspect, various structures can be configured by arbitrarily combining the above-described various capacitors at arbitrary positions on the left, right, up, and down of the sectional view of the annular iron core.

In order to complete a line filter, a capacitor is mounted and coil-wound, and then the terminals of the reactor and the capacitor are penetrated into the terminal holes of the printed wiring board and are connected by soldering. If a capacitor that could not be accommodated in the reactor and input and output terminals are mounted on this printed board, it becomes a line filter. Further, the coil terminals of the reactor can be used as input and output terminals as they are.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A width of 20 mm and a thickness of 0.02 mm
Of amorphous nano-micron crystalline alloy
A ring-shaped iron core having a diameter of 0 mm, an outer diameter of 60 mm, and a height of 20 mm was formed and subjected to a heat treatment at 460 ° C. in a magnetic field to remove distortion, thereby producing a ring-shaped iron core made of an amorphous nanomicron crystal alloy.
(Alps Electric Co., Ltd .; Nanopalm)

As an embodiment of the individual capacitor according to the first and second aspects, two PET films each having a thickness of 12 μm and a thickness of 13 mm and having a thickness of 13 mm are stacked on a winding core having a diameter of 2 mm and wound up to a capacitance value of 0.02 μF. After being removed from the winding core and pressed into a flat shape, heat-treated at 135 ° C., and then wound with a 0.10 mm-thick polyester adhesive tape as an exterior, a 3.5 mm-thick, 6.5 mm-wide, 13 mm-high capacitor element is formed. Then, molten solder was sprayed on both sides of the element, and then a lead of 1.2 mmφ was soldered thereon to produce 14 capacitors 0.02 μF shown in FIG.
As shown in FIG. 2, two capacitors of 0.02 μF were manufactured as a 0.01 μF capacitor in a series of two capacitors. Next, connect 5 capacitors of 0.02μF each in parallel,
Two sets of 0.1 μF capacitors shown in FIG. 6 were manufactured.

Next, the annular iron core is accommodated in the inner peripheral side of the lower case having the partition wall shown in FIG. 7, and the capacitors 0.01 μF2 and 0.1 μF2 are accommodated in the outer peripheral side. The terminals of the coil and the capacitor were inserted through the holes, and the lid was covered. Two coils of 1 mH were formed by winding an insulated copper wire of 1.2 mmΦ for 12 turns, and the reactor for the line filter shown in FIG. 8 was formed. .

After inserting the terminals into the printed circuit board having through holes and wiring patterns corresponding to the terminals of the line filter reactor and soldering them, the output terminals are connected to complete the line filter. FIG. 9 shows a perspective view of the finished product.

The cylindrical capacitor according to claim 3 has a U-shaped bobbin on the outer side of the case cross section shown in FIG.
m, PET film of width X-1 mm
Two composite capacitors of 0.1 μF and two 0.01 μF were rolled up to form four composite capacitors. At this time, the terminals are drawn out with the aluminum foil interposed therebetween and lead wires are connected. The subsequent steps are the same as described above.

The hollow disk-shaped composite capacitor according to claim 4 is obtained by mixing a barium titanate-based powder (ZX2, manufactured by Kyoritsu Ceramic Industry Co., Ltd.) with a binder (polyvinyl butyral) and a solvent (toluene), and using a doctor blade to reduce the thickness to zero. .
Four sheets punched out into a hollow disk having 20% firing shrinkage molded into a 5 mm green sheet, laminated and pressed, fired at 1380 ° C., outer diameter 46 mmΦ, inner diameter 28 mm
A capacitor substrate shown in FIG. 11 having Φ, a thickness of 1.7 mm, and a dielectric constant of 29,000 was formed. Next, composite electrodes are printed with silver paste on both sides of the substrate, fired at 850 ° C, and lead wires are soldered to form a hollow disk-shaped composite capacitor in which two 0.01 μF and two 0.1 μF are arranged. did.

Next, on the annular iron core, a thickness of 0.5
mm bake plate is punched into the same shape via an insulating spacer, the hollow disk-shaped composite capacitor is stacked and stored in the lower case, and the terminal of the coil and capacitor is passed through the terminal hole of the upper case and the lid is closed. In the same manner as described above, winding was performed to form a line filter reactor.

According to an embodiment of a structure combining various capacitors according to claim 5, a hollow disk composite capacitor is disposed on a ring-shaped iron core via a spacer as shown in a sectional view of a case shown in FIG. A cylindrical composite capacitor was placed outside. As a result, the total capacitance value that can be accommodated by the capacitor increases, so that a multi-stage filter with a large number of components or a multi-phase filter can be configured. Further, since the terminals of the capacitor can be arranged in two rows, the design of the wiring board and the terminal connection are facilitated.

As described above, the reactor for a line filter of the present invention incorporates a capacitor constituting a filter in the reactor, thereby reducing the number of assembling steps and reducing the size of the filter board on which the reactor and the capacitor are mounted. It is possible to provide a small line filter.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a power supply line filter.

FIG. 2 is a component mounting diagram of a conventional filter wiring board.

FIG. 3 is a sectional view in which a film capacitor is wound into a case in a cylindrical shape and an annular iron core is housed.

FIG. 4 shows a round film capacitor.

FIG. 5 is a film capacitor pressed in a curved shape.

FIG. 6 shows five film capacitors connected in parallel in a curved shape along the outer periphery of the case.

FIG. 7 is a sectional view of a case in which a partition is provided inside.

FIG. 8 is a sectional view in which a cylindrical composite ceramic capacitor and a ring-shaped iron core are housed in a case having a partition wall therein.

FIG. 9 is a perspective view of a line filter in which a reactor with a built-in capacitor is mounted on a filter substrate.

FIG. 10 is a substrate for a fired composite ceramic capacitor.

FIG. 11 is a cross-sectional view in which a cylindrical composite film capacitor is wound into a case, and a hollow disk-shaped composite ceramic capacitor is housed via a ring-shaped iron core and a spacer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Filter board 2 ... Reactor 3 ... Film capacitor 4 ... Filter terminal 5 ... Reactor case 6 ... Annular iron core 7 ... Cylindrical composite film capacitor 8 ... Partition wall 9 ... Coil terminal 10 ... … Capacitor terminal 11 …… Upper case 12 …… Coil 13 …… Insulating spacer 14 …… Hollow disc-shaped composite ceramic capacitor

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shinichiro Hayashi 1-18-18 Nakamagome, Ota-ku, Tokyo Soshin Electric Co., Ltd. (72) Inventor Tetsuya Fukai 1-18-18 Nakamagome, Ota-ku, Tokyo No. Soshin Electric Co., Ltd. F-term (reference) 5E058 DA06 DA07 5E082 AA01 BB02 CC01 DD13 DD15 EE07 FG26 FG27 FG34 LL15 5J024 AA01 BA14 DA01 DA27 EA09

Claims (6)

[Claims] 1. A reactor for a line filter used for a line filter configured by combining a plurality of capacitors and a reactor, wherein an arbitrary number of capacitors among the plurality of capacitors constituting the filter are arranged substantially uniformly along the annular iron core. A reactor for a line filter with a built-in capacitor, in which a conductor is wound around the coil to form a coil. 2. The reactor for a line filter according to claim 1, wherein the arbitrary number of capacitors are individual or composite capacitors having a curved shape along the annular iron core. 3. The reactor for a line filter according to claim 1, wherein the arbitrary number of capacitors is a cylindrical composite capacitor along an annular iron core. 4. The reactor for a line filter according to claim 1, wherein the arbitrary number of capacitors are hollow disk-shaped composite capacitors along the annular iron core. 5. The capacitor according to claim 1, wherein the arbitrary number of capacitors is any combination of curved individual or composite capacitors along the annular iron core, hollow disk-shaped composite capacitors, and cylindrical composite capacitors. Item 7. A reactor for a line filter according to Item 1. 6. A line filter using the reactor for a line filter according to claim 1. Description: