JPH0897054A - Power supply transformer - Google Patents

Abstract

PURPOSE: To protect an insulating layer located at the lead-out wire of a primary winding against damage caused by burrs by a method wherein a projection separating the lead-out wire of the primary winding from a secondary winding is provided in the periphery of a spacer. CONSTITUTION: A projection 10A is provided in the periphery of a spacer 10 located between a primary winding 3 and a secondary winding 5 so as to isolate the lead-out parts 3A and 3B of the primary winding 3 from the secondary winding 5. Or, a part of the secondary winding 5 which confronts the lead-out parts 3A and 3B through the intermediary of the spacer 10 is removed. By this setup, the cut surface of a secondary winding is located inside a spacer, so that an insulating layer located on the lead-out part of a primary winding is protected against damage caused by burrs even if burrs are produced on the cut surface of the secondary winding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transformer as a power conversion means incorporated in a power supply device such as a switching power supply.

[0002]

2. Description of the Related Art A conventional example of this type of power transformer is shown in FIGS. 5 and 6, FIG. 5 is an exploded perspective view, and FIG. 6 is a sectional view of FIG. 5 and 6, reference numerals 1 and 2 are cores, and the cores 1 and 2 have protrusions 1A and 2A at their central portions.
And the winding housing 1B, around the protrusions 1A, 2A.
2B is formed. Reference numeral 3 denotes a primary winding having lead-out portions 3A and 3B. The primary winding 3 is spirally wound and formed in a flat plate shape, and the inner lead-out portion 3A is led out along a flat plate surface. 5 is a drawer part 5A, 5B
The secondary winding has a flat plate shape and a horseshoe shape, and the lead-out portions 5A and 5B are provided with screw holes 5C and 5D for external connection. Reference numeral 7 denotes an insulating member housed in the winding housing portions 1B and 2B of the cores 1 and 2, and the insulating member 7 is the protrusions 1A and 2A of the cores 1 and 2.
7A of cylindrical inner peripheral wall into which is inserted, and notch parts 7C, 7
It has an outer peripheral wall 7B whose both ends are opened by D. Reference numerals 8 and 10 denote spacers. The spacer 8 insulates the primary winding 3 from the core 1, and has a notch 8A for guiding the lead-out portion 3A inside the primary winding 3. Spacer 10
The primary winding 3 and the secondary winding 5 are insulated from each other, and the thickness thereof is changed to arbitrarily adjust the gap between the primary winding 3 and the secondary winding 5. The coupling coefficient between the wire 3 and the secondary winding 5 and the capacitance value are set to optimum values.

This power transformer is assembled by assembling a spacer between the secondary winding 5, the primary winding 3 and the secondary winding 5 in the space between the inner peripheral wall 7A and the outer peripheral wall 7B of the insulating member 7. 10, the primary winding 3, the spacer 8 between the primary winding 3 and the core 1 are installed in this order. When assembled, the secondary winding 5 has its drawn-out portions 5A and 5B projected from the cutout portion 7C of the insulating member 7,
Further, in the primary winding 3, the drawn-out portions 3A and 3B have insulating members 7
It is assembled so as to project from the notch 7D. The insulating member 7 in which the primary winding 3, the secondary winding 5, and the spacers 8 and 10 are assembled in a predetermined order in this manner is incorporated in the core 2.
In this case, the protrusion 2 of the core 2 is provided in the inner peripheral wall 7A of the insulating member 7.
A is plugged. After assembling the insulating member 7 into the core 2, the core 1 is superposed so that the protrusion 1A of the core 1 is inserted into the inner peripheral wall 7A of the insulating member 7, and the tip of the protrusion 1A of the core 1 is the end of the protrusion 2A of the core 2. Then, the core 1 and the core 2 are fixed to each other with an insulating tape or the like to complete the power transformer.

7 and 8 show another conventional example of this type of power transformer, FIG. 7 is an exploded perspective view, and FIG. 8 is a sectional view of FIG. The conventional example shown in FIGS. 7 and 8 differs from the conventional example shown in FIGS. 5 and 6 in that the primary winding and the secondary winding are respectively divided into two primary windings 3 and 4 and one primary winding. And the other secondary windings 5 and 6, and these primary windings 3 and 4 and secondary windings 5 and 6
The point is that they are connected in parallel outside.

This power transformer is assembled by assembling the other secondary winding 6, the other primary winding 4 and the other secondary winding 6 in the space between the inner peripheral wall 7A and the outer peripheral wall 7B of the insulating member 7. A spacer 11 between the other primary winding 4, one secondary winding 5 and the other primary winding 4 and a spacer 9, one secondary winding 5, one primary winding 3 and A spacer 10 between one secondary winding 5, a primary winding 3 on one side, and a spacer 8 between one primary winding 3 and the core 1 are assembled in this order. Others are the same as those of the conventional example shown in FIGS.

The power transformer shown in FIGS. 7 and 8 is characterized in that the conversion efficiency is improved because the magnetic coupling between the primary winding and the secondary winding is improved.

[0007]

In each of the above power transformers, the spacer between the primary winding and the secondary winding insulates the primary winding from the secondary winding and keeps the thickness thereof. By changing it, the gap between the primary winding and the secondary winding can be adjusted arbitrarily, and the coupling coefficient and the capacitance value between the primary winding and the secondary winding can be set to optimum values. However, usually, as thin as possible is used so as to increase the coupling coefficient between the primary winding and the secondary winding to improve the conversion efficiency.

By the way, the flat secondary winding is usually formed by punching, but if there is a burr on the cut surface, the burr exceeds the thickness of the spacer and the insulating layer at the lead-out portion of the primary winding is formed. Risk of damage and insulation failure. However, removing the burrs on the cut surface of the secondary winding requires work man-hours, which causes a cost increase. An object of the present invention is to provide a power transformer in which even if a burr is formed on the cut surface of the secondary winding, the burr does not damage the insulating layer of the drawn-out portion of the primary winding.

[0009]

In order to achieve the above-mentioned object, the invention described in claim 1 or 2 comprises two members having a winding housing portion around a protrusion formed in the central portion, A pair of cores arranged by reversing the members of
A primary winding that is wound in a spiral shape and has a pair of lead-out portions; a secondary winding that is formed in a flat plate and has a pair of lead-out portions; and an inner peripheral portion of the primary winding and the secondary winding A power transformer comprising an insulating member that insulates the outer periphery from the core, and the primary winding and the secondary winding are stacked and arranged in the winding housing portion of the pair of cores while insulating each other with a spacer. In the above, the outer periphery of the spacer is provided with a protrusion that separates the lead-out portion of the primary winding from the secondary winding, or is opposed to the lead-out portion of the primary winding of the secondary winding through the spacer. Remove the part to be used. Further, claim 3 or 4
The invention described in (1) is composed of two members having a winding housing portion around a protrusion formed in the central part, and a pair of cores arranged by reversing one member, and a pair of cores wound in a spiral shape, each pair being a pair. Each divided into two primary windings having a lead-out part, each divided into two secondary windings formed in a flat plate and each having a pair of drawn-out parts, said one divided primary winding and one The secondary windings of the other primary winding and the other secondary winding of the other primary winding and the other secondary winding of the spacer while keeping the insulation of each other by the spacer, and they are sequentially stacked and arranged. A power transformer comprising an insulating member that insulates an inner peripheral portion, an outer peripheral portion of each of the secondary windings and a core from each other, and the insulating member is housed in a winding housing portion of the pair of cores. On the outer circumference of each spacer. Each of the primary windings is provided with a convex portion that separates the drawn-out portion from each of the secondary windings, or the drawn-out portion of each of the secondary windings of each of the primary windings is provided with each of the spacers. Remove the facing part.

[0010]

According to the invention described in claim 1 or 3, even if burrs are formed on the cut surface of the secondary winding, the burrs are provided on the outer circumference of the spacer between the primary winding and the secondary winding. Since the protruding portion separates the primary winding from the lead-out portion, the burr does not damage the insulating layer of the primary winding.

In any of the second and fourth aspects of the invention, since the portion facing the lead-out portion of the primary winding of the secondary winding via the spacer is removed, the cut surface of the secondary winding in this portion is removed. Is located inside the spacer, and even if burrs are formed on the cut surface of the secondary winding, the burrs do not damage the insulating layer of the drawn-out portion of the primary winding.

[0012]

1 is an exploded perspective view showing an embodiment of a power transformer of the invention described in claim 1. In FIG. The embodiment shown in FIG. 1 is different from the conventional example shown in FIGS. 5 and 6 in that the lead-out portions 3A, 3B of the primary winding 3 are provided on the outer periphery of the spacer 10 between the primary winding 3 and the secondary winding 5. The point is that a convex portion 10A is provided to isolate between the secondary winding 5 and the secondary winding 5.

In this embodiment, even if burrs are formed on the cut surface of the secondary winding 5, the burrs are separated from the lead-out portions 3A and 3B of the primary winding 3 by the convex portion 10A provided on the outer periphery of the spacer 10. Therefore, the burr does not damage the insulating layers of the lead-out portions 3A and 3B of the primary winding 3,
Insulation failure is prevented. Others are the same as those of the conventional example shown in FIGS.

FIG. 2 is an exploded perspective view showing an embodiment of the power transformer of the invention described in claim 2. The embodiment shown in FIG. 2 is different from the conventional example shown in FIGS. 5 and 6 in that a portion 5G facing the lead-out portions 3A and 3B of the primary winding 3 of the secondary winding 5 with a spacer 10 is removed. In point. In this embodiment, the lead-out portion 3 of the primary winding 3 of the secondary winding 5 is
Since the portion 5G facing the A and 3B via the spacer 10 is removed, the cut surface 5E of the secondary winding 5 in this portion comes to be located inside the spacer, and the cut surface of the secondary winding has a burr. Even if this occurs, this burr will be
Insulation defects are prevented without damaging the insulating layers of A and 3B. Others are the same as those of the conventional example shown in FIGS.

FIGS. 3 and 4 are exploded perspective views showing embodiments of the power transformer of the invention described in claims 3 and 4, respectively. In the embodiment shown in FIG. 3, the spacers 10 and 11 of the conventional example shown in FIGS. 7 and 8 are provided with projections 11A and 11B as in the embodiment shown in FIG.
In the embodiment shown in FIG. 7, the spacers 10 and 11 of the one and the other secondary windings 5 and 6 of the conventional example shown in FIGS. 7 and 8 are opposed to the drawn portions of the one and the other primary windings 3 and 4. The parts 5G and 6G to be removed are removed in the same manner as in the embodiment shown in FIG. 2, and the operation and effect of these embodiments are the same as those in the embodiment shown in FIG. 1 or 2.

[0016]

According to the power transformer of the invention described in claims 1 to 4, even if burrs are formed on the cut surface of the secondary winding, the burrs do not damage the insulating layer of the drawn-out portion of the primary winding. Insulation failure is prevented and reliability is improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a power transformer of the invention described in claim 1.

FIG. 2 is an exploded perspective view showing an embodiment of the power transformer of the invention described in claim 2.

FIG. 3 is an exploded perspective view showing an embodiment of a power transformer of the invention described in claim 3.

FIG. 4 is an exploded perspective view showing an embodiment of a power transformer of the invention described in claim 4.

FIG. 5 is an exploded perspective view showing an example of a conventional power transformer.

6 is a sectional view of FIG.

FIG. 7 is an exploded perspective view showing a different example of a conventional power transformer.

8 is a sectional view of FIG.

[Explanation of symbols]

1 core 2 core 3 primary winding, one primary winding 4 other primary winding 5 secondary winding, one secondary winding 5G part of one primary winding facing through a spacer 6 spacer other Secondary winding 6G A portion facing the lead-out portion of the other primary winding via a spacer 7 Insulating member 10 Spacer 10A Convex portion 11 Spacer 11A Convex portion

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location 9375-5E H01F 31/00 H

Claims (4)

[Claims] 1. A pair of cores comprising two members each having a winding accommodating portion around a protrusion formed in the central portion, one member being inverted and the other, and a pair of spirally wound cores. A primary winding having a lead-out portion, a secondary winding formed in a flat plate shape and having a pair of lead-out portions, and an insulation for insulating the inner peripheral portion, the outer peripheral portion, and the core of the primary winding and the secondary winding from each other. A primary winding and a secondary winding, wherein the primary winding and the secondary winding are stacked and arranged in the winding housing portion of the pair of cores while insulating them from each other by a spacer, and the primary winding is provided on the outer periphery of the spacer. A power transformer characterized in that a convex portion is provided to isolate the wire drawing portion and the secondary winding. 2. A pair of cores comprising two members each having a winding housing portion around a protrusion formed in the central portion, one member being inverted, and a pair of cores spirally wound. A primary winding having a lead-out portion, a secondary winding formed in a flat plate shape and having a pair of lead-out portions, and an insulation for insulating the inner peripheral portion, the outer peripheral portion, and the core of the primary winding and the secondary winding from each other. A primary winding and a secondary winding, wherein the primary winding and the secondary winding are stacked and arranged in a winding housing portion of the pair of cores while insulating them from each other by a spacer. A power supply transformer, wherein a portion of the primary winding facing the lead-out portion via the spacer is removed. 3. A pair of cores, each of which is composed of two members each having a winding housing portion around a protrusion formed in a central portion, one member being reversed, and a pair of cores which are wound in a spiral shape. Each divided into two primary windings having a lead-out part, each divided into two secondary windings formed in a flat plate and each having a pair of drawn-out parts, said one divided primary winding and one The secondary windings of the other primary winding and the other secondary winding of the other primary winding and the other secondary winding of the spacer while keeping the insulation of each other by the spacer, and they are sequentially stacked and arranged. A power transformer comprising an insulating member that insulates a core from an inner peripheral portion and an outer peripheral portion of each of the secondary windings and the secondary winding, and the insulating member is housed in a winding housing portion of the pair of cores. , On the outer circumference of each spacer Re power transformer, characterized in that a convex portion to isolate between the lead-out portion and each of the secondary windings of the primary winding. 4. A pair of cores, each of which is composed of two members each having a winding housing portion around a protrusion formed in the central portion, and one member is inverted, and a pair of cores which are spirally wound. Each divided into two primary windings having a lead-out part, each divided into two secondary windings formed in a flat plate and each having a pair of drawn-out parts, said one divided primary winding and one The secondary windings of the other primary winding and the other secondary winding of the other primary winding and the other secondary winding of the spacer while keeping the insulation of each other by the spacer, and they are sequentially stacked and arranged. A power transformer comprising an insulating member that insulates a core from an inner peripheral portion and an outer peripheral portion of each of the secondary windings and the secondary winding, and the insulating member is housed in a winding housing portion of the pair of cores. , The primary of each secondary winding Power transformer, characterized in that the removal of the respective portions opposing each other via the respective spacer to the lead portion of the line.