JP2003158021A - Wound-type common mode choke coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wound-type common mode choke coil which is capable of reducing the number of manufacturing processes and a cost and which can be surely mounted on a circuit board. SOLUTION: The wound-type common mode choke coil comprises a ferrite core body 10A having four leg parts 16a, 16b, 16c, and 16d formed at the corners on the bottom side respectively, a coil part 11M which is made by winding a coil winding 11 around the center of the ferrite core body 10A, and a magnetic field formation ferrite core provided with winding intertwined input electrodes 13a and 13b and winding intertwined output electrodes 14a and 14b, each of which is formed by intertwining an end part of the coil winding 11 with the leg parts 16a, 16b, 16c, and 16d and dipped the winding intertwined leg part in solder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire-wound common mode choke coil which can be manufactured on a circuit board with a reduced number of manufacturing steps and a reduced cost.

[0002]

2. Description of the Related Art FIG. 4 is a perspective view of a conventional wire wound common mode choke coil. FIG. 4 (a) shows a magnetic field forming ferrite core 50 and a closed magnetic circuit forming ferrite core 60 which constitute the wire wound common mode choke coil. FIG. 4B is a perspective view when the and are assembled, and FIG. 4B is a perspective view when the magnetic field forming ferrite core 50 is viewed from the bottom surface side.

As shown in FIG. 4A, the conventional winding type common mode choke coil is composed of a magnetic field forming ferrite core 50 and a closed magnetic circuit forming ferrite core 60, and the magnetic field forming ferrite core 50 and the closed magnetic circuit. The formed ferrite core 60 is joined and assembled to form a closed magnetic circuit. The closed magnetic circuit forming ferrite core 60 has a rectangular plane, and is fixed to the upper surface side of the magnetic field forming ferrite core 50 opposite to the bottom surface side.

As shown in FIG. 4 (b), the magnetic field forming ferrite core 50 has an H-shaped side surface, and a winding 51 is wound in the center to form a winding portion 51M.

Legs 56a, 56 are provided at the bottom corners.
b, 56c, 56d are formed, and the input electrode 53 is correspondingly formed.
a and 53b and output electrodes 54a and 54b are provided. Input electrodes 53a and 53b and output electrodes 54a and 54b
Is formed for mounting on the circuit board by melting the solder because the wettability of the ferrite material of the magnetic field forming ferrite core 50 is poor. However, the three-layer structure of Ag firing, Ni plating, and Sn plating is used. And the winding 51
The two magnet wires 51a and 51b are wound by bifilar winding, and one terminal is fixed on the corresponding input electrodes 53a and 53b, and the other terminal is fixed on the corresponding output electrodes 54a and 54b by thermocompression bonding. Therefore, a large number of manufacturing processes are required, which causes a cost increase.

Further, the magnet wire 5 thermocompression bonded to the input electrodes 53a and 53b and the output electrodes 54a and 54b.
The terminals 1a and 51b have a problem that they are easily removed (peeled) due to the heat of solder melting when they are mounted on the circuit board because the bonding area is very small.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to reduce the manufacturing man-hours, realize the cost reduction, and surely perform the mounting on the circuit board. An object is to provide a linear common mode choke coil.

[0008]

A winding type common mode choke coil according to the present invention has a ferrite core body having four legs formed in corners on the bottom side, and a winding at the center of the ferrite core body. And a magnetic field forming ferrite core having a winding portion formed by winding and a winding entangled input electrode and a winding entangled output electrode formed by soldering the ends of the winding entwined with the legs. It was configured.

In the winding-entangled input electrode and the winding-entangled output electrode, two magnet wires forming the winding are bifilarly wound around a winding portion, and two magnets forming the winding are formed. It was decided to be formed by each end of the wire.

Further, the winding entangled input electrode and the winding entangled output electrode draw the winding entangled in the leg portion obliquely at a predetermined acute angle with respect to the side surface of the leg portion, and the angle of the leg portion. It was decided to cut by.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

FIG. 1 is a perspective view of a wire-wound common mode choke coil according to an embodiment of the present invention.
FIG. 1A is a perspective view of a magnetic field forming ferrite core 10 for forming a magnetic field and a closed magnetic path forming ferrite core 20 for forming a closed magnetic circuit, which form a wound-type common mode choke coil, assembled together, and FIG. FIG. 3 is a perspective view of the magnetic field forming ferrite core 10 when viewed from the bottom side.

As shown in FIG. 1A, the wire wound common mode choke coil according to the present invention comprises a magnetic field forming ferrite core 10 and a closed magnetic circuit forming ferrite core 20. Closed magnetic circuit forming Ferrite core 20 is joined and assembled to form a closed magnetic circuit.

The magnetic field forming ferrite core 10 is shown in FIG.
As shown in (b), the winding portion forming groove 17a is formed on the bottom surface side.
The ferrite core body 10A has a winding portion forming groove 17b formed on the upper surface side.
Two legs 16a and 16b are formed at the corners of one end, and two legs 16c and 1c are formed at the corners of the other end.
6d is formed.

Two winding-entangled input electrodes 13a and 13b are formed corresponding to the leg portions 16a and 16b, respectively.
Two winding-entangled output electrodes 14 corresponding to c and 16d
a and 14b are formed.

In the ferrite core body 10A, the winding portion forming groove 17a and the winding portion forming groove 17b are sandwiched and the winding 11 is formed at the center.
Is wound to form a winding portion 11M. Winding 11
The two magnet wires 11a and 11b are the winding parts 11
It is wound on M by bifilar and magnet wire 11
One of the terminals a and 11b has a corresponding leg 16
a and 16b, the other ends of the magnet wires 11a and 11b are entwined with the corresponding leg portions 16c and 16d and soldered, and the winding entangled input electrodes 13a and 1d.
3b and winding-entangled output electrodes 14a and 14b are formed.

FIG. 2 is a side view of the winding-entangled output electrode 14b.

As shown in FIG. 2, the winding-entangled output electrode 14
In b, the magnet wire 11a of the winding wire 11 is entangled with the leg portion 16d of the ferrite core body 10A, and the solder layer 19d is formed by solder dip on the surface of the entangled magnet wire 11a.

FIG. 2 shows the winding-entangled input electrode 13 shown in FIG.
a and 13b and the winding-entangled output electrodes 14a and 14b are representative of the winding-entangled output electrode 14b, and the other winding-entangled input electrodes 13a and 13b and the winding-entangled output electrode 14a are also formed in the same manner. It is something.

FIG. 3 is a perspective view when forming the winding-entangled output electrode 14b of the magnetic field forming ferrite core 10 according to the present invention, and FIG. 3 (a) shows when the winding is entangled in the legs. 3 (b) shows a case where the winding is entangled with the legs and soldered, and FIG. 3 (c) shows a case where the end of the winding is cut.

As shown in FIG. 3A, the magnet wire 11a of the winding wire 11 is entangled a predetermined number of times with the leg portion 16d of the ferrite core body 10A. The end of the magnet wire 11a that has been entangled has a leg portion 16d as shown by an arrow P.
Is drawn diagonally to the side of.

As shown in FIG. 3 (b), the magnet wire 11a of the winding wire 11 is entwined with the leg 16d a predetermined number of times, and then a solder layer 19d is formed on the surface of the entangled magnet wire 11a by solder dipping. It Also at this time, the end of the magnet wire 11a which is entangled is pulled obliquely with respect to the side surface of the leg portion 16d as shown by an arrow P.

As shown in FIG. 3 (c), the magnet wire 11a of the winding wire 11 is entangled a predetermined number of times with the leg portion 16d of the ferrite core body 10A, and the solder layer 19 is dipped on the surface of the entangled magnet wire 11a.
Entangled magnet wire 1 when d is formed
The terminal 1a is obliquely drawn at a predetermined acute angle with respect to the side surface of the leg portion 16d and is cut at the corner of the leg portion 16d as shown by an arrow P to form the winding-entangled output electrode 14b.

FIG. 3 shows the winding-entangled input electrode 13 shown in FIG.
The winding entangled output electrode 14b is shown as a representative of the a and 13b and the winding entangled output electrodes 14a and 14b, and the other winding entangled input electrodes 13a and 13b and the winding entangled output electrode 14a are formed in the same manner. To be done.

Thereafter, the magnetic field forming ferrite core 10 is
The closed magnetic circuit forming ferrite core 20 is joined and assembled to form a wire wound common mode choke coil. When the wire-wound common mode choke coil is mounted on the circuit board, the solder layer formed on the winding-entangled input electrodes 13a and 13b and the winding-entangled output electrodes 14a and 14b shown in FIG. The winding-entangled input electrodes 13a and 13b and the winding-entangled output electrodes 14a and 1
4b can be soldered to the conductor pattern formed on the circuit board. Since the ends of the magnet wire are entangled with the leg portions and the solder layers are formed on the four surfaces of the leg portions, they can be reliably mounted on the circuit board without peeling off.

In the above embodiment, the winding-entangled input electrodes 13a and 13b and the winding-entangled output electrodes 14a and 14b.
Entangles the winding with the legs, then dips the entangled windings and cuts the ends of the winding to form, but not limited to this, entangle the winding with the legs. It is also possible to cut the ends of the winding and form the entangled winding by solder dipping.

As described above, the magnetic field forming ferrite core 10 is electrically joined by the winding entangled input electrode and the winding entangled input electrode having a simple structure which does not require the conventional formation of electrodes and crimping of the winding to the electrodes. By doing so, it is possible to reduce the number of manufacturing steps and realize the cost reduction, and to reliably mount the circuit board.

[0028]

The wound-type common mode choke coil of the present invention is formed by a ferrite core body having four legs formed in corners on the bottom side, and a winding wound around the center of the ferrite core body. Since it has a magnetic field forming ferrite core having a winding entanglement input electrode and a winding entanglement output electrode formed by soldering the ends of the winding entangled with the leg portion, The number of manufacturing steps can be reduced to realize cost reduction, and the mounting on the circuit board can be surely performed.

The winding-entangled input electrode and the winding-entangled output electrode are formed by each end of the magnet wire, in which two magnet wires forming the winding are bifilarly wound around a winding portion. Therefore, the common mode choke coil can be accurately formed.

Further, the winding-entangled input electrode and the winding-entangled output electrode draw the winding entangled in the leg portion obliquely at a predetermined acute angle with respect to the side surface of the leg portion, and the angle of the leg portion. Since it is formed by cutting with, it can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a perspective view of a wire-wound common mode choke coil according to an embodiment of the present invention, and FIG. 1A is a magnetic field forming ferrite core for forming a magnetic field and a closed magnetic circuit forming a wire wound common mode choke coil. FIG. 1 is a perspective view of a closed magnetic circuit forming ferrite core for use in assembly.
(B) is a perspective view of the magnetic field forming ferrite core when viewed from the bottom side.

FIG. 2 is a side view of a winding-entangled output electrode.

FIG. 3 is a perspective view when forming a winding-entangled output electrode of a magnetic field forming ferrite core according to the present invention.
FIG. 3 (a) shows the case where the winding is entangled in the legs, and FIG.
3B shows a case where the winding is entangled with the legs and soldered, and FIG. 3C shows a case where the end of the winding is cut.

FIG. 4 is a perspective view of a conventional wire-wound common mode choke coil, and FIG. 4 (a) is a perspective view when a magnetic field forming ferrite core and a closed magnetic circuit forming ferrite core that constitute the wire wound common mode choke coil are assembled. FIG. 4B is a perspective view of the magnetic field forming ferrite core when viewed from the bottom side.

[Explanation of symbols]

10, 50 Magnetic field forming ferrite core 10A Ferrite core body 11 windings 11M winding part 13a, 13b winding-entangled input electrode 14a, 14b winding-entangled output electrode 16a, 16b, 16c, 16d Legs 17a, 17b Winding portion forming groove 19d solder layer 20 Ferrite core with closed magnetic circuit

Claims (3)

[Claims] 1. A ferrite core body having four legs formed in corners on the bottom side, a winding portion formed by winding a winding in the center of the ferrite core body, and an end of the winding. A winding-type common mode choke coil, comprising: a magnetic field forming ferrite core having a winding-entangled input electrode and a winding-entangled output electrode, which are entwined with the leg and solder-dipped. 2. The winding-entangled input electrode and the winding-entangled output electrode are formed by bifilar winding of two magnet wires forming the winding around a winding portion and each end of the magnet wire. The wire-wound common mode choke coil according to claim 1, wherein. 3. The winding entangled input electrode and the winding entangled output electrode draw the winding entangled in the leg portion obliquely at a predetermined acute angle with respect to a side surface of the leg portion, and an angle of the leg portion. The wound-type common mode choke coil according to claim 1 or 2, wherein the winding-type common mode choke coil is formed by cutting.