KR20050012173A - Switching transformer - Google Patents

Abstract

PURPOSE: A switching transformer is provided to reduce a size and a thickness of the switching transformer by excluding a shield case and a containing case from the switching transformer. CONSTITUTION: A switching transformer includes a transformer body(1), a core(9) at case, and a core(14) at upper portion. The transformer body includes a coil(4) wound around a coil bobbin and includes a pin electrode(8) inserted therein. The core at case includes a transformer body container(13) for the transformer body. The core at upper portion is attached to an upper portion of the core at case and covers an upper portion of the transformer body contained in the transformer body container.

Description

Switching transformer {SWITCHING TRANSFORMER}

The present invention relates to a switching transformer for use in consumer electronics.

In recent years, various devices are required to save space, and accordingly, they tend to be miniaturized, thinned, and the like.

Thinner-oriented devices such as DVD home theaters, liquid crystal TVs, PDPs, SWADs for mobile personal computers, etc. are considered to be the mainstream of demand in the future. As a result, switching power supplies are naturally required to be thinner. Any attempt to thin the switching power supply will limit the switching transformer.

Although there exist various types of switching transformers, as a thin type, the thin switching transformer shown in FIG. 5 is proposed by the present applicant first.

The thin switching transformer includes a transbody including a coil bobbin 22 and a pair of magnetic cores 23 in which a coil 20 and a pin terminal 21 are installed, and a storage case 25 covering the trans body. And a shield case formed on an inner surface of the storage case 25 and covering the trans body, and a resin 26 injected into the storage case 25 on which the trans body is installed.

[Patent Document 1]

Japanese Patent Application 2003-40545

When the switching transformer is used as a power source for an acoustic equipment, a noise including an audible range frequency is generated from this power supply, and the generated noise affects the acoustic equipment.

Since this noise is generated a lot from the transformer, a shield case, a storage case 25, or the like is provided to prevent noise from the transformer. In the case of a large-capacity transformer, the switching transformer is excellent.

However, in the case of small capacity, the shield case, the storage case 25, etc. are not necessarily required. In addition, if there is no shield case and the storage case 25, the size and thickness can be reduced by that much.

SUMMARY OF THE INVENTION The present invention has been proposed in view of this, and an object thereof is to provide a switching transformer which reduces the number of parts, the number of assembly steps, and the like, and further reduces the size and thickness.

1 is an exploded perspective view of Embodiment 1 of the present invention.

Figure 2 is an assembled perspective view of the first embodiment.

Figure 3 is an exploded perspective view of another embodiment of the present invention.

4 is a perspective view of a case side core of another embodiment of the present invention;

5 is a cross-sectional view of the prior art.

<Description of the symbols for the main parts of the drawings>

1,1A: transbody 2: coil bobbin

3: body portion 4: coil

5,5A: upper flange 6: lower flange

7,7A: terminal block 8: pin terminal

9,9A, 9B: Case side core 10: Bottom plate

11 center projection 12 circumferential wall

13,13A, 13B: Transbody compartment 14,14A: Upper core

According to the invention of claim 1, the transbody 1,1A and the transbody 1,1A provided with the coil 4 wound outside the coil bobbin 2, and the pin terminal 8 is planted. The case body cores 9, 9A, 9B, on which the transbody housing portions 13, 13A are formed, are attached to an upper portion of the case side cores 9, 9A, 9B, and the transbody housing portions 13, The above object is achieved by having the upper cores 14 and 14A covering the upper portions of the transbody 1 and 1A placed in 13A).

According to the invention described in claim 2, the terminal blocks 7 and 7A are formed at both ends of the flanges 5 and 5A of the coil bobbin 2, and the terminal blocks 7 and 7A according to the first aspect. And pin terminals 8 and 8A are installed in the upper and lower cores 14 and 14A to cover the terminal blocks 7 and 7A, and the upper surface and the pin terminals 8 and 8A of the terminal blocks 7 and 7A. 8A) is configured to be exposed to the outside.

In addition, in description of Claim 1 or 2, it is set as the structure which fills the resin with the said transbody accommodating part 13 and 13A in which the said transbody 1,1A was accommodated.

According to the invention as set forth in claim 1, the transbody (1, 1A) is provided in the cores (9, 9A, 9B) on the case side having an opening, and on the upper cores (14, 14A) also having a function as a lid covered on the opening side. ) And the trans-body (1, 1A) to be covered by the core, the shield member and the storage case is unnecessary, so that the material cost can be reduced, as well as easy to assemble, miniaturization It can be thinned.

According to invention of Claim 2, it can install easily on a mounting surface via the pin terminal 8 and 8A planted in the terminal block 7 and 7A which consist of insulating resin.

According to invention of Claim 3, insulation of the transbody (1, 1A) can be ensured.

Best Mode for Carrying Out the Invention

The present invention is characterized by using a core as a shield case and a storage case by omitting the shield case and the storage case for storing the transbody.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described according to drawing.

EXAMPLE

1 is an exploded perspective view of an embodiment of the present invention, Figure 2 shows an assembled perspective view.

1 is a transbody, and this transbody 1 is formed in the coil bobbin 2 which consists of insulating resin shape | molded in an appropriate shape as needed, and the outer periphery of the trunk part 3 of this coil bobbin 2. It is comprised with the coil 4 wound up.

On both ends of the trunk portion 3 of the coil bobbin 2, upper flanges 5 and lower flanges 6 each having an outer shape, for example, have an arc shape, are formed, and both ends of the upper flange 5 are formed. The thick terminal block 7 is integrally formed, and a plurality of pin terminals 8 are planted on the upper surface of the terminal block 7 at appropriate intervals. In addition, the lead wire (not shown) of the coil 4 wound around the outer circumference of the trunk portion 3 is, as is well known, a predetermined pin through a lead groove (not shown) formed in the coil bobbin 2. It is wound around the source of the terminal and soldered, and the transbody 1 is formed by this.

Reference numeral 9 is a case side core made of a molded product of ferrite, and a central protrusion 11 is formed at the center of the bottom plate 10 on which the transbody 1 is placed, and around the bottom plate 10 is shown. In the above state, the circumferential wall 12 standing upward is formed, and the space portion between the central protrusion 11 and the circumferential wall 12 serves as the trans-body accommodating portion 13.

In this example, the central protrusion 11 is formed in a cylindrical shape corresponding to the hollow portion of the trunk portion 3 of the coil bobbin 2. In addition, the transbody accommodating part 13 is formed in the shape corresponding to the external shape so that the upper and lower flanges 5 and 6 and the terminal block 7 of the coil bobbin 2 can be accommodated inside.

Reference numeral 14 denotes an upper core, made of the same material as the case side core 9, and provided above the opening of the case side core 9.

The upper core 14 is formed in a rectangular plate shape, for example, and covers an upper portion of the upper flange 5 between the terminal blocks 7 of the transbody 1 accommodated in the case side core 9. Is installed. In this case, the upper flange 5 is covered, and an adhesive agent (not shown) is applied to the circumferential wall 12 of the case-side core 9 to be contacted between the lower portions of the corresponding upper core 14, The upper core 14 and the case side core 9 are integrated.

The coil 4 and the upper and lower flanges 5 and 6 of the transbody 1 are covered by the case side core 9 and the upper core 14, and the case side core 9 and the upper core 14 It functions as a shield case and a storage case.

In assembling, the trans-body body 1 separately assembled beforehand is accommodated in the trans-body accommodating part 13 of the case side core 9, and also the resin like epoxy resin is filled. After filling and curing the resin, the upper core 14 is attached to the upper part of the circumferential wall 12 of the case side core 9 through an adhesive, so that the switching transformer can be easily assembled with a small number of assembling steps. In addition, a magnetic gap of a suitable interval is provided between the central protrusion 11 and the covered upper core 14 as is well known. In addition, the upper surfaces of the terminal blocks 7 and 7A protrude from the upper surface of the upper core 14 in consideration of installation on the attachment surface.

In the above description, the case where the resin is filled after the transbody 1 is stored in the case-side core 9 has been described. However, the upper core 14 is covered after the transbody storage, and the resin is vacuum-filled therein. Also good. In this case, mixing of air can be prevented and the transbody 1 can be insulated reliably.

In addition, the resin filling may be omitted by using a three-layer electric wire as the electric wire of the coil 4.

In addition, depending on the specification, the electric wire of the coil 4 may be used as a normal electric wire, and filling of resin may be abbreviate | omitted.

In addition, the shape of the transbody 1, the case side core 9, and the upper core 14 is not limited to the above-mentioned example of FIG. 1 and FIG. 2, For example, as shown in FIG. The transbody 1A is housed in a case-side core 9A having a transbody housing portion 13A capable of accommodating the transbody 1A, with the transverse body 1 having the transverse body 1A in a substantially long circular shape. It is good also as a structure which covered the plate-shaped upper core 14A in which the notch part 14a which exposes the upper surface of 7A of terminal blocks of 1A was covered.

In addition, as shown in FIG. 4, the outer body and the transbody accommodating part 13B of the case-side core 9B are made into a long circular shape, or formed in an appropriate shape as needed, and also the transbody and upper case which are assembled to it It may be a shape corresponding thereto.

INDUSTRIAL APPLICABILITY The present invention can be used for DVD home theaters, liquid crystal televisions, PDPs, SWADs for mobile personal computers, and the like.

Claims (3)

The coil body 2 is wound around the coil bobbin 2 and the pin terminals 8 are provided with a trans main body 1, 1 A, and a trans body storing part 13, 13 A for accommodating the trans body 1, 1 A. ) Is formed on the case-side cores 9, 9A, 9B, and the transbody body 1, which is attached to the case-side cores 9, 9A, 9B and placed in the trans-body accommodating portions 13, 13A. A switching transformer comprising upper cores (14, 14A) covering an upper portion of 1A). A terminal block (7, 7A) is formed at both ends of the flanges (5, 5A) of the coil bobbin (2), and the pin terminals (8, 8A) on the terminal block (7, 7A). And the upper cores 14 and 14A cover the terminal blocks 7 and 7A, and the upper surfaces of the terminal blocks 7 and 7A and the pin terminals 8 and 8A are exposed to the outside. Switching transformer. The switching transformer according to claim 1 or 2, wherein a resin is filled in the trans-body accommodating portion (13, 13A) in which the trans-body (1, 1A) is accommodated.