JPH08227815A - Composite winding component - Google Patents

Abstract

PURPOSE: To provide a composite winding component which can be assembled easily and whose size can be reduced by forming windings for a transformer and a choke coil at the same time and constituting the transformer and the choke coil with one and the same component. CONSTITUTION: A closed magnetic path 3 and an open magnetic path 4 are formed by combination of a rectangular frame shaped core 1 and an I-shaped core 2. The I-shaped core 2 is so located that it may be extended over short sides 1b, 1c which face each other or long sides 1d, 1e which face each other of the frame-shaped core 1, with its one end projecting outside the frame-shaped core 1. A winding 7 for a transformer is formed at a part of the I-shaped core 2 which is in the closed magnetic path 3 and a winding 8 for a choke coil is formed at a part of the I-shaped core 2 which is in the open magnetic path 4. Two closed magnetic paths are formed with a combination of the rectangular frame-shaped core 1 which has a central leg section at the center and the I- shaped core 2. The winding 7 for the transformer is being formed at the part of the I-shaped core 2 which is in one closed magnetic path and the winding 8 is being formed at a part of the I-shaped core 2 in the other closed magnetic path.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite winding component in which a transformer and a choke coil are integrally formed in one component.

[0002]

2. Description of the Related Art Generally, a power supply device such as a DC-DC converter or an inverter for a fluorescent lamp has a winding such as a converter transformer for switching, an input side choke coil for noise reduction or an output side choke coil for smoothing. Parts are installed. As shown in FIG. 7, these winding parts are often configured as a single transformer T or a choke coil L and mounted in a power supply device in many cases. In recent years, however, the purpose is to reduce the size and cost of the device. In addition, composite winding parts in which both are integrally formed have come to be used. For example, in Japanese Utility Model Publication No. 3-3317, a magnetic path core is formed by combining an E-shaped core and an I-shaped core, a choke coil winding is provided on one side leg of the E-shaped core, and a side leg of the other side. Each of the converter transformer windings is shown in FIG.

Further, a structure as shown in FIGS. 8 to 12 is also conceivable. That is, FIG. 8 shows a case in which the transformer winding 7 and the choke coil winding 8 are formed in closed magnetic circuits, respectively.
0 indicates that the winding 7 of the transformer is formed in a closed magnetic circuit and the winding 8 of the choke coil is formed in an open magnetic circuit. FIG. 11 is a diagram in which the winding 8 of the choke coil is formed in an I-shaped core. The winding 7 of the transformer is attached to the middle leg of the integrally molded frame-shaped core,
The winding 8 of the choke coil is formed on the outer periphery thereof.

These are examples of composite winding parts in which the winding 7 of the transformer and the winding 8 of the choke coil are respectively formed.

[0005]

However, if the transformer T and the choke coil L are configured as individual components as described above, the mounting space becomes large and the device becomes large. Further, in the above-described composite winding component, when the winding is directly applied to the middle leg of the E-shaped core, the outer legs on both sides are obstructive, so that it is extremely difficult to wind the coil. The windings have to be treated separately, which complicates the assembly.

In addition, if the core has a complicated shape as in the above embodiment, it may be easily deformed during firing, which may cause inconvenience in accuracy when a closed magnetic circuit is formed in combination with an I-shaped core.
There is also a problem with workability.

An object of the present invention is to eliminate the above-mentioned inconvenience, perform winding of a transformer and a choke coil at one time, and configure the transformer and the choke coil with one component, so that the assembly is easy and the size can be reduced. To provide a composite winding component.

[0008]

That is, according to the present invention, a rectangular frame-shaped core (1) and opposing short side portions (1b, 1c) or long side portions (1b, 1c) of the frame-shaped core (1). 1d, 1e) and a closed magnetic circuit (3) and an open magnetic circuit (4) in combination with the I-shaped core (2) installed so that one end thereof projects outside the frame-shaped core (1). ) Is formed, the winding (7) of the transformer is applied to the I-shaped core (2) portion of the closed magnetic circuit (3), and the choke coil of the I-shaped core (2) portion of the open magnetic circuit (4) is formed. It is constructed by applying a winding wire (8).

Further, in the present invention, the central leg portion (1a) is provided in the middle portion.
) In a rectangular frame-shaped core (1) and the short side parts (1b, 1c) or long side parts (1d, 1e) and the central leg part (1a) facing each other of the frame-shaped core (1). Two closed magnetic paths (3, 5) are formed in combination with the I-shaped core (2) installed so as to straddle, and a transformer winding is formed on the I-shaped core (2) portion of one closed magnetic path (3). (7) is applied, and the choke coil winding (8) is applied to the I-shaped core (2) of the other closed magnetic circuit (5).

[0010]

[Operation] According to the present invention having the above-mentioned configuration, the transformer winding and the choke coil winding are respectively provided on the I-shaped core, and the transformer is constructed by installing the winding on the short side or the long side of the frame-shaped core. It is possible to integrally form the choke coil.

With such a configuration, the winding of the choke coil and the winding of the transformer are separated by the edge of the frame-shaped core or the core of the central leg to form separate magnetic paths. These magnetic paths have almost no magnetic interference and act so as to fully satisfy the functions of the choke coil and the transformer. Moreover, since the winding of the I-shaped core can be wound before being combined with the frame-shaped core, workability is extremely good.

[0012]

1 is a perspective view showing an embodiment of a composite winding component according to the present invention, and FIG. 2 is an assembled perspective view thereof.

As shown in FIG. 2, the magnetic path core used in this composite winding component is an elongated rectangular frame-shaped core 1 and an I-shaped core 2 longer than the long side portions 1d and 1e of the frame-shaped core 1. It is composed of a combination of. The frame-shaped core 1 is provided with a rectangular mounting groove 6 into which the above-mentioned I-shaped core 2 can be fitted, on the upper surfaces of the opposite short side portions 1b, 1c of the frame-shaped core 1. By mounting and fixing the I-shaped core 2 on, the closed magnetic circuit 3 is formed inside the frame-shaped core 1 and the open magnetic circuit 4 is formed outside.

Therefore, two types of windings 7 and 8 are directly applied to the I-shaped core 2 at the same time, and the wound I-shaped core 2 is installed in the mounting groove 6 of the frame-shaped core 1 as shown in FIG. As described above, a composite winding component is formed in which the transformer winding 7 of the closed magnetic circuit 3 and the choke coil winding 8 of the open magnetic circuit 4 are integrally formed. In such a configuration, the winding 7 of the transformer and the winding 8 of the choke coil are separated by the short side portion 1b of the frame-shaped core 1 and are separated from each other, so that there is no magnetic mutual interference and each function, that is, the transformer. And the function of the choke coil can be fully satisfied. When the core is directly wound as in this embodiment, the surface of the I-shaped core 2 is subjected to an appropriate insulation treatment.

FIG. 3 is a perspective view showing another embodiment of the winding component according to the present invention, and FIG. 4 is its assembly perspective view.

In this embodiment, the frame-shaped core 1 has an elongated rectangular shape having a central leg portion 1a in the middle portion, and the short side portions 1 facing each other are formed.
b, a rectangular mounting groove 6 is provided on the upper surface of 1c, substantially in the center,
Two closed magnetic paths 3 and 5 are formed by placing and fixing an I-shaped core 2 having substantially the same length as the frame-shaped core 1 in the mounting groove 6.

Therefore, as shown in FIG. 3, the I-shaped core 2 is directly provided with the two kinds of windings 7 and 8 and the I-shaped core 2 is installed in the mounting groove 6 of the frame-shaped core 1 as in the above embodiment. As described above, a composite winding component in which the transformer winding 7 of the closed magnetic circuit 3 and the choke coil winding 8 of the closed magnetic circuit 5 are integrally formed can be configured. In such a configuration, the winding 7 of the transformer and the winding 8 of the choke coil are partitioned by the central leg 1a of the frame-shaped core 1,
Since they are magnetically separated, the functions of the transformer and choke coil are fully satisfied.

As described above, the composite winding component according to the present invention has a structure in which the transformer winding 7 and the choke coil winding 8 are provided on the I-shaped core 2 and then the I-shaped core 2 and the frame-shaped core 1 are combined. Therefore, even when the wire is wound directly on the core, the winding is easy and the workability can be improved because the processing can be performed at once. Further, since the frame-shaped core 1 and the I-shaped core 2 are vertically and horizontally symmetrical, deformation such as warpage during core firing is unlikely to occur,
Moreover, since the shape is simple, it has excellent workability, lower cost,
Miniaturization is possible.

In this embodiment, the case of directly winding on the I-shaped core 2 is shown, but the present invention is not limited to this, and a bobbin (not shown) having a winding is attached to the I-shaped core 2. It may be configured with. Further, the frame-shaped core 1 and the I-shaped core 2 may be fixed to each other by fitting with the mounting groove 6, but for secure fixing, it is preferable to sandwich them with an adhesive or a metal fitting.

In this embodiment, the I-shaped core 2 is the frame-shaped core 1.
The short side portions 1b and 1c are installed between the long side portions 1d and 1e, but in this case,
The mounting groove 6 is provided on both long side portions 1d and 1e, and the central leg portion 1a is provided between the long side portions 1d and 1e.

FIG. 5 shows an inverter circuit constructed by using the composite winding component of the present invention, and FIG. 6 shows a forward converter circuit. Although the circuit concerned is conventionally known, the description of the circuit operation is omitted, but FIG. 5 shows an example in which the input side choke coil L and the converter transformer T are integrally formed to form a composite winding component, and FIG. 6 shows the converter transformer T and the output. This is an example in which the side choke coil L is integrally formed to form a composite winding component.

[0022]

As described above, the composite winding component according to the present invention has a structure in which an I-shaped core having a transformer winding and a choke coil winding is laid on a frame-shaped core. Even when wound directly on the core, the winding is easy, and the workability is extremely good because the transformer and choke coil can be wound at once.

Further, since the frame-shaped core and the I-shaped core are vertically and horizontally symmetrical, deformation such as warpage during firing of the core hardly occurs,
Moreover, since the shape is simple, it has excellent workability, lower cost,
Can be miniaturized.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a composite winding component according to the present invention.

FIG. 2 is an assembled perspective view of FIG.

FIG. 3 is a perspective view showing another embodiment of the composite winding component according to the present invention.

4 is an assembled perspective view of FIG. 3. FIG.

FIG. 5 is a circuit diagram showing an example of an inverter using the composite winding component of the present invention.

FIG. 6 is a circuit diagram showing an example of a forward converter using a composite winding component.

FIG. 7 is a perspective view showing a state in which a single transformer and a choke coil are mounted.

FIG. 8 is a perspective view showing an example of a conventional composite winding component.

FIG. 9 is a perspective view showing an embodiment different from that of FIG. 8;

FIG. 10 is a perspective view showing another embodiment different from that of FIG. 9;

FIG. 11 is a perspective view showing an embodiment different from that of FIG.

FIG. 12 is a perspective view showing an embodiment different from that of FIG. 11;

[Explanation of symbols]

 1 Frame-shaped core 1a Central leg 1b, 1c Short side 1d, 1e Long side 2 I-shaped core 3, 5 Closed magnetic path 4 Open magnetic path 7 Transformer winding 8 Choke coil winding

Continued Front Page (72) Toru Hirohashi 5-36-11 Shimbashi, Minato-ku, Tokyo Inside Fuji Electric Chemical Co., Ltd.

Claims (2)

[Claims] 1. A rectangular frame-shaped core (1) and a short side (1b, 1c) or a long side (1d, 1e) of the frame-shaped core (1) facing each other. , And a closed magnetic path (3) and an open magnetic path (4) are formed by a combination with an I-shaped core (2) installed with one end protruding outside the frame-shaped core (1), and the closed magnetic path (3) is formed. ), The winding (7) of the transformer is applied to the I-shaped core (2), and the winding (8) of the choke coil is applied to the I-shaped core (2) of the open magnetic circuit (4). Winding parts. 2. A rectangular frame-shaped core (1) having a central leg (1a) in an intermediate portion, and opposing short side portions (1b, 1c) or long side portions of the frame-shaped core (1). (1d, 1e) and the I-shaped core (2) installed so as to straddle the central leg (1a) form two closed magnetic paths (3, 5), and one closed magnetic path (3) The winding (7) of the transformer is applied to the I-shaped core (2) of the
A composite winding part formed by winding a choke coil winding (8) on the shaped core (2).