JPH0747847Y2 - Common mode choke coil - Google Patents

Description

[Detailed Description of Device] a. Object of the Invention [Industrial field of application] The present invention relates to a board-mounted common mode choke coil mounted on an electronic device and used as a noise filter for suppressing electromagnetic noise.

[Conventional technology]

Toroidal cores, UU cores, and square-shaped cores are used as the magnetic cores of conventional common mode choke coils (hereinafter simply referred to as common coils).

The toroidal type common coil is a coil in which two windings are insulated from each other and wound from an insulating case containing a magnetic core (hereinafter referred to as a core) having a high relative magnetic permeability characteristic.
The pin terminals were fixed on the terminal block or the mounting table, which was mounted on the board. Therefore, it is difficult for the conventional common coil to wind the winding work, it is difficult to provide a partition plate for electrically isolating the two windings in the winding, and the common coil using the toroidal coil type core is difficult. Since there is little leakage flux in the coil, there is inconvenience that the amount of attenuation in the low frequency band is small, so that a UU type core or a square shaped core is used instead. The UU type common coil has two windings wound around a winding frame with pin terminals, which has a partitioning guard between windings and a partitioning guard inside the winding, and inserts one magnetic leg of the U-shaped core into the winding core. And butt them together, and then tighten them with 2
It is a structure that closes the back of two U-shaped cores and holds them in a closed magnetic circuit, but since the UU-shaped core has a gap in the abutting surface of the two cores, the required leakage flux that is effective when DC currents are superposed can be obtained. On the other hand, since the main inductance has a low value due to the air gap, it has been realized by increasing the number of windings, resulting in a large shape.

On the other hand, the conventional common coil with a square-shaped core stores the core in an insulating case that integrally has a partition plate between the windings and inside the winding, and has two windings on the opposite sides of the core from above the insulating case. It is a wound structure, and the required leakage flux is secured by separating the two windings.

[Problems to be solved by the device]

The square-shaped core has more leakage flux than the toroidal core, and since the number of windings on the inner diameter side of the core can be increased, a large inductance can be obtained with the same outer shape of the core. Since the plate is integrated with the insulating case, there is a problem that the central rectangular space available for winding the winding is small, which results in inefficient winding work.

B. Configuration of the Invention [Means for Solving the Problems] The present invention separately prepares an insulation case for a square-shaped core and a partition plate between windings, and the insulation case has an outer periphery of opposite sides in which a partition plate inside the winding is provided. Side recesses are formed in the vicinity of both ends of the side face, and a ridge is provided in the longitudinal direction at the center of the side face on the inner peripheral side of the other facing side. The plate is provided with retaining pieces with hooks projecting at the four corners, and it is provided uprightly and integrally with the central portion of the rectangular base plate with the pin terminals hung down, and an insulating case with winding and a rectangular base plate are provided. The winding partitioning plate is fitted in the vertical groove, and the engaging claws of the holding pieces are engaged in the engaging recesses for combination, and the winding is connected to the pin terminals.

[Action]

The insulation case that uses a square-shaped ferrite core that can increase the number of windings on the inner diameter side is divided into upper and lower parts, and the case division piece is divided into two parts. The windings divided into two legs after they are fitted to each other are divided into two legs, and the windings are separated by two winding partition plates that stand upright at the center of the rectangular base plate that attaches the common coil to the board. It can be split and attached to a square base plate, while a two-piece insulation case using a square-shaped core that is integrally assembled by the fitting recess attached to the insulating case and the latching claw provided on the square base plate This is the common choke coil used.

〔Example〕

FIG. 1 is an external view of an embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof.

In FIG. 1, 1 is an insulating case, 2 is a partition plate in the winding,
Reference numeral 3 is an engaging concave portion, 4 is a winding wire, 5 is a rectangular base plate, 6 is an inter-winding partition plate, 7 is a retaining claw holding piece, and 8 is a pin terminal.

As shown in FIG. 2, the insulating case 1 is composed of two case-divided pieces 10 of the same shape and the same size which can be put on the square-shaped ferrite core 9 from above and below to be butted. The case division piece 10 has a bottomed double-sided rectangular tube shape as shown in the lower part of FIG.
On the outer cylinder 11 and the inner cylinder 12, a fitting stepped portion 13 is formed on the peripheral surfaces on the opposite sides of the center line parallel to the long side (on the left side of the center line, the inner cylinder 11 and the inner cylinder 12 are It is formed on the peripheral surface, and on the right side, on the outer peripheral surfaces of the outer cylinder 11 and the inner cylinder 12, respectively. In the fitting stepped portion 13, each case division piece is connected with a slight break (exaggerated in the drawing) at the center line.

The winding inner partition plate 2 has a side surface on the outer peripheral side (outer peripheral surface of the outer cylinder 11), a bottom surface and a side surface on the inner peripheral side (inner circumference of the inner cylinder 12) at the center of the opposite sides of the long sides of the case division piece 10. Surface), and the distance between the side end faces on the inner peripheral side thereof is determined by the winding partition plate 6
The upper end surface on the outer peripheral side is slightly lower than the upper end surface on the inner peripheral side so that when the case pieces 10 are combined, there is a gap for winding transition.

The winding support plate 14 extends the inner side wall (the short side wall of the inner cylinder 12) of the opposite side of the short side of the case division piece 10 outward, and extends over the bottom surface and the outer side surface. It is provided in a shape.

The engaging recesses 3 are formed in the vicinity of both ends of the outer peripheral side surface of the opposite side of the long side and outside the winding support plate 14, respectively, and the fitting stepped portion 13 is formed on the outer peripheral surface of the outer cylinder 11. At the place, it is formed so that a part of the fitting step 13 is lowered.
On the side formed on the inner peripheral surface of the outer cylinder 11, the side wall is fitted with the fitting step portion 13
It is shaped to cut out a little deeper.

In the central portion of the side surface on the inner peripheral side of the opposing piece on the short side of the case dividing piece 10 (which is also the central portion of the winding support plate 14), the winding partition plate 6 and the vertical groove 16 for guiding the winding partition plate are provided. The protrusion 15 is provided.

The square base plate 5 is an insulating plate that is one size larger than the planar outer shape of the insulating case 1 (case divided piece 10 ). As shown in FIG. Are parallel to each other and are integrally provided, and the four corners of the surface (three points are shown)
The holding piece 7 with a hook of a square bar is integrally provided on the
Standoff protrusions 17 are provided near the four corners on the bottom surface, and a plurality of pin terminals 8 are provided along a side line parallel to the winding partition plate 6.
(One of the four is shown in the figure). The vertical groove on the side surface of the rectangular base plate 5 is for guiding the lead wire of the winding wire 4. Downward hooking claws 18 corresponding to the fitting recesses 3 of the case dividing piece 10 are provided on the upper surface of the square bar-shaped holding side 7 with hooking claws that faces the partition plate 6.

Put the square-shaped ferrite core 9 into the two case dividing pieces 10 and assemble into the insulating case 1 to divide the winding 4 into the winding partition between one winding partition plate 2 and the winding support plate 14. Winding 2
Similarly, the winding wire 4 is wound around the winding partition formed by the inner partition plate 2 of the other winding wire. Vertical groove 16 of insulating case 1 with winding 4
The inter-winding partition plate 6 is fitted to the above and the insulating case 1 is pressed until the in-winding partition plate 2 and the winding support plate 14 come into contact with the rectangular base plate 5. By this pressing, the hooking claw 18 is slidably contacted with the side surface of the insulating case, and then fitted into the hooking concave portion 3 to prevent the insulating case 1 from coming off the rectangular base plate 5. The lead wire of the winding wire 4 is passed through the vertical groove of the base plate 5 and connected to the pin terminals 8, respectively, to form a board-mounted common choke coil.

C. Effect of the Invention [Effect of the Invention] In the common coil of the square-shaped core according to the present invention, the inter-winding partition plate is separated from the insulating case with the in-winding partition plate, and the insulating case has a vertical groove for guiding the inter-winding partition plate. Since the protrusions are provided and the engaging recess is provided on the side of the case, and the winding partition plate is provided on the square base plate with the retaining piece with the engaging claws corresponding to the engaging recess, the winding work efficiency is improved. Is better than before, and the insulating case can be easily fixed to the base plate by fitting it with the winding partition plate. Therefore, it has a large amount of attenuation in the low frequency band and is effective in impulsive noise that also has the amount of attenuation in the high frequency band. Type common choke coil can be provided at a lower cost than before.

[Brief description of drawings]

FIG. 1 is an external view showing an embodiment of the present invention. 2 is also an exploded perspective view 1 ... Insulating case, 2 ... Winding partition plate, 3 ... Engagement recess, 4 ... Winding wire, 5 ... Rectangular base plate, 6 ... Winding partition plate, 7: Holding piece with hooks, 8: Pin terminal, 9: Square-shaped ferrite core, 10: Case split piece, 11: Outer cylinder, 12: Inner cylinder, 13: Fitting step , 14 ...... Winding support plate, 15 ...... ridge, 16 ...... vertical groove, 17 ...... Stand-off lug, 18 ...... Latch claw.

Claims (1)

[Scope of utility model registration request] 1. A common mode choke coil formed by winding two windings on opposite sides of the core from above an insulating case accommodating a square-shaped ferrite core. Partition plates inside the winding are provided around the outer walls of the opposite sides of the case, and engaging recesses are formed near both ends of the outer side surface, and the vertical direction is provided at the center of the inner side surface of the other opposite side. Each of which is provided with a vertical groove, and in which the winding partitioning plate is provided upright in the central portion, and the holding pieces with hooking claws are provided at the four corners to project. The rectangular base plate having the pin terminals vertically erected and the insulating case are combined by fitting the inter-winding partition plate in the vertical groove and engaging the retaining claws of the holding pieces in the engaging recesses, Common mode with windings connected to pin terminals Yokukoiru.