JPH0558642B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a high-frequency switching power transformer for large currents using an amorphous core.

(Prior Art) As shown in Fig. 3, a conventional high-frequency switching power transformer for large currents has a toroidal coil 28 with a primary winding around a ferrite core.
A conductive member such as a copper plate or a copper rod is passed through the center of this toroidal coil 28 to connect the secondary electrode 2.
9, and a spacer 30 was used between the secondary electrode 29 and the toroidal coil 28.

However, the switching power transformer described above has the drawback that the matching between the primary side toroidal coil and the secondary side electrode is poor, resulting in increased leakage inductance.

Therefore, the applicant of the present application has already filed and proposed Japanese Patent Application No. 63-218080 in order to solve this drawback.
The high-frequency switching power transformer for large current according to this proposal, as shown in FIG. 4, has an insulating material 32 attached above and below a primary coil 31, and these assemblies are assembled into a bottomed cylindrical body with a cylindrical portion 33a inside. 3
3b, a disk-shaped secondary side is provided on the cylindrical portion 33a so as not to contact the bottomed cylindrical body 33b, and has a secondary side inner pole 34a. The inner electrode plate 34 is attached by soldering, and an insulating plate 35 is provided on the bottomed cylindrical body 33b, and the secondary outer plate 34 is also integrated with the bottomed cylindrical body 33b by soldering. Pole 36 was installed. And the secondary inner pole 3
4 and the secondary outer pole 36 are arranged in directions orthogonal to each other.

(Problems to be Solved by the Invention) In the switching power transformer having the above-described configuration, the secondary inner pole 34 is connected to the cylindrical portion 3 of the secondary conductor 33.
The secondary outer pole 36 was integrated by soldering to the protrusion provided on the bottomed cylinder 33b of the secondary conductor 33, and the secondary outer pole 36 was integrated by soldering to the protrusion provided on the bottomed cylinder 33b of the secondary conductor 33. This soldering work was not something that anyone could do, but required a skilled person.

Further, since the soldering is done by hand, there is a problem that there is variation and the appearance is not good or bad.

The present invention was made in view of the above circumstances, and
The purpose is to facilitate the connection of the secondary inner pole and the secondary outer pole, and to facilitate assembly.
In addition, the present invention aims to provide a switching power transformer that completely eliminates variations in the appearance of assembled products and reduces the number of parts.

(Means for Solving the Problems) The present invention includes a toroidal coil 1 formed by winding a primary winding 1a around a toroidal core using amorphous amorphous, and spacers provided on the inner circumferential surface and bottom side of this toroidal coil 1. 2, and a secondary conductor 3 that encloses the toroidal coil 1 provided with the spacer 2 and covers the inner and outer peripheral surfaces and bottom of the toroidal coil 1, and the secondary conductor 3 is a bottomed cylindrical outer peripheral cylinder. 3a, and an inner circumferential cylinder 3b in the form of a closed cylinder, which is provided inside the inner circumferential cylinder 3b and to which the secondary inner pole 4 is attached to the upper part, and the outer circumferential cylinder 3a.
A mounting portion 3c extending outward is formed on the upper end surface of a, and has an insertion hole 6a on the secondary conductor 3 that extends upward through the secondary conductor 3, and is connected to other equipment. A mounting plate 6 made of an insulator for mounting is provided, and a long hole 5c is provided on the mounting plate 6 through which the secondary conductor 4 is inserted in an insulated state to be exposed. The above object is achieved by providing a secondary outer pole 5 having a secondary outer pole 5 and screwing the secondary outer pole 5 onto the mounting portion 3c of the secondary conductor 3.

(Function) The switching power transformer of the present invention configured as described above has a mounting portion 3c provided on the upper end surface of the outer peripheral cylinder of the secondary conductor 3 that houses the toroidal coil.
In addition, since the secondary outer pole 5 provided on the secondary conductor 3 is screwed, special soldering work is not required, and ease of assembly, appearance, etc. are improved.

(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2. Figure 1 is an exploded perspective view of a switching power transformer. This switching power transformer is made up of a toroidal coil 1 with a primary winding 1a wound around an amorphous core material, and an insulating material attached to the toroidal coil 1. a secondary conductor 3 that accommodates the toroidal coil 1 to which the spacer 2 is attached; a secondary inner pole 4 and a secondary outer pole 5 that are screwed onto the secondary conductor 3; The secondary inner pole 4 and the secondary outer pole 5 are held in an insulating state, and the mounting plate 6 is provided between the secondary outer pole 5 and the toroidal coil 1. ing.

That is, the toroidal coil 1 has a primary winding 1a wound around the outer periphery of a toroidal core made of an amorphous alloy, and has a high saturation magnetic flux density, low heat generation, and is compact. A spacer 2 is attached to the toroidal coil 1 from below. This spacer 2 is molded from an insulating material made of synthetic resin such as polyacetal or nylon, and has a flat ring-shaped flange 2a on the lower side and a cylindrical portion 2b inserted into the center of the toroidal coil 1 in the center. The length of this cylindrical portion 2b is matched to the thickness direction of the toroidal coil 1. This spacer 2 combined with the toroidal coil 1 is housed in a secondary conductor 3 that includes it from three directions. This secondary conductor 3 is formed by drawing a conductive thin plate such as a copper plate, and includes a bottomed outer peripheral cylinder 3a and a cylindrical portion 2b of the spacer 2 inside the outer peripheral cylinder 3a.
It has an inner circumferential cylinder 3b in the form of a closed cylinder inserted into the outer circumferential cylinder 3a, and an outer circumferential cylinder 3a on the upper end surface of the outer circumferential cylinder 3a.
A plurality of mounting portions 3c are provided which are bent outward in a direction perpendicular to the mounting portion 3c. This mounting portion 3c is provided with a mounting hole 3d into which a secondary outer pole 5, which will be described later, is screwed. Furthermore, a mounting hole 3e for screwing a secondary inner pole 4, which will be described later, is provided on the upper surface of the inner circumferential cylinder 3b having a closed cylindrical shape.

The secondary inner pole 4 is made of a substantially L-shaped conductive metal piece, and the upright portion 4a has a mounting hole 4b for attaching an external lead wire, and the center of the flat portion 4c has the inner circumferential cylinder. A mounting hole 4d is provided which engages with the mounting hole 3e of 3b, and is screwed into the mounting hole 4d with a screw 7. A protruding portion extending downward from the central end surface of the flat portion 4c is a rotation stopper 4e, which is inserted and locked into a locking hole 3f provided on the upper surface of the inner circumferential cylinder 3b.

Mounting plate 6 placed on the upper surface of the secondary conductor 3
is a substantially square flat plate made of an insulating material made of synthetic resin such as polyacetal or nylon, similar to the spacer 2, and the upright portion 4a of the secondary inner pole 4 is inserted through the center of the upper surface. A platform 6b having a horizontally long hole 6a is formed. A plurality of through holes 6c corresponding to the mounting holes 3d provided in the mounting portion 3c of the secondary side conductor 3 are solidly formed in a direction perpendicular to the direction of the elongated hole 6a. Mounting holes 6 in the four corners for attaching to other equipment
d is formed. A groove (not shown) is formed on the back side of the mounting plate 6 to be attached to the upper end surface of the secondary conductor 3, so that the mounting plate 6 is covered with the secondary conductor 3. It is configured to be fitted together.

The secondary outer pole 5 is a conductive metal plate and is formed of a flat plate portion 5a disposed in close contact with the mounting plate 6, and a pair of electrode plate portions 5b standing upright from the flat plate portion 5a. There is. In the center of the flat plate part 5a, there is a long hole 5c that penetrates the base part 6b on the mounting plate 6.
The electrode plate portions 5b are formed in a pair of opposing directions. The length of the flat plate portion 5a in the width direction without forming the electrode plate portion 5b is approximately equal to the length of one side of the mounting plate 6, and the secondary conductor 3 is located near the end surface of the flat plate portion 5a. A plurality of mounting holes 5d are formed corresponding to the mounting hole 3d on the mounting portion 3c and the through hole 6c of the mounting plate 6, and the mounting hole 6d on the mounting plate 6 is formed.
By removing the portions corresponding to the above, the secondary outer electrode 5 can be insulated even if the secondary outer electrode 5 is screwed onto a separate device using screws or the like on the mounting plate 6.

The switching power transformer having the configuration described above can be easily assembled by performing the following steps. . First, fit the spacer 2 from the bottom of the toroidal coil 1, and
is attached to the inner peripheral cylinder 3b of the secondary conductor 3, and the lead wires 1a and 1b of the toroidal coil 1 are processed. Next, the secondary inner pole 4 is fastened onto the inner peripheral cylinder 3b via the screw 7, and the mounting plate 6 is attached to the upright portion 4b of the secondary inner pole 4.
The slots provided on the back side of the mounting plate 6 are fitted into the outer circumferential cylinder 3a of the secondary conductor 3. At this time, it is confirmed that the through hole 6c of the mounting plate 6 matches the mounting hole 3d provided in the mounting portion 3c of the outer peripheral cylinder 3a, and the secondary outer pole 5 is placed on the mounting plate 6. And the elongated hole 5 on the secondary outer pole 5
c into the mounting hole 6c of the mounting plate 6.
Insert the mounting screw 8 into the mounting part 3 of the secondary conductor 3.
If it is screwed on to c, it can be assembled as shown in Fig. 2.

As described above, the switching power transformer of the present invention can be easily assembled, and since there are no connection points such as soldering, assembly is easy, and the finish is good and there is no variation in appearance.

In addition, since the inner periphery, outer periphery, and bottom surface of the toroidal coil 1 are covered with the secondary conductor 3, leakage flux is suppressed, and since the conductor surface is large, the skin effect of high-frequency current is also large, reducing leakage inductance. It has excellent features such as less

(Effects of the Invention) As explained in detail above, the switching power transformer of the present invention includes a toroidal coil 1 formed by winding the primary winding 1a around a toroidal core using amorphous amorphous, and an inner circumference of the toroidal coil 1. a spacer 2 provided on the surface and bottom sides;
The toroidal coil 1 provided with this spacer 2
and a secondary conductor 3 that covers the inner and outer circumferential surfaces and bottom of the secondary conductor 3, which is provided inside an outer circumferential cylinder 3a having a bottomed cylindrical shape,
In addition, it has an inner peripheral cylinder 3b having a lidded cylindrical shape to which the secondary inner pole 4 is attached to the upper part, and a mounting part 3 extending outwardly on the upper end surface of the outer peripheral cylinder 3a.
c is formed on the secondary side conductor 3, and has an insertion hole 6a that penetrates the secondary side conductor 3 upward, and is made of an insulator for attachment to other equipment.
and has a long hole 5c on the mounting plate 6 through which the secondary conductor 4 is insulated and exposed,
A secondary outer pole 5 having a plate portion 5b is provided, and the secondary outer pole 5 is attached to the mounting portion 3c of the secondary conductor 3.
Since the secondary inner pole and the secondary outer pole can be easily connected without soldering, anyone can easily connect the secondary side inner pole and the secondary outer pole, which improves assembly efficiency and improves the quality of the assembled product. This has the advantage that there is no variation in appearance.

Further, there is an effect that parts such as the secondary inner electrode plate 34 and the spacer 32 (see FIG. 4) provided on the toroidal coil 31 in the prior art proposed by the present applicant can be reduced.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention; FIG. 1 is an exploded perspective view of a switching power transformer;
FIG. 2 is a cross-sectional view after assembly, FIG. 3 is a perspective view of a conventional example, and FIG. 4 is a perspective view showing a prior art by the present applicant. 1...Toroidal coil, 2...Spacer, 3
...Secondary side conductor, 3a...Outer circumference cylinder, 3b...Inner circumference cylinder, 3c...Mounting part, 4...Secondary side inner pole, 5
...Secondary side outer pole, 7, 8...Screw.

Claims (1)

[Claims] 1 Toroidal coil 1 formed by winding the primary winding 1a around a toroidal core using amorphous
, a spacer 2 provided on the inner peripheral surface and bottom side of this toroidal coil 1, and a secondary side conductor 3 that encloses the toroidal coil 1 provided with this spacer 2 and covers the inner and outer peripheral surfaces and bottom thereof. The secondary conductor 3 includes an outer circumferential cylinder 3a having a bottomed cylindrical shape, and an inner circumferential cylinder 3b having a covered cylindrical shape provided inside the outer circumferential cylinder 3a and having the secondary inner pole 4 attached to the upper part thereof.
At the same time, a mounting portion 3c extending outward is formed on the upper end surface of the outer circumferential cylinder 3a, and an insertion hole 6a is formed on the secondary conductor 3 to penetrate the secondary conductor 3 upward. A mounting plate 6 made of an insulator for mounting on other equipment is provided, and a long hole 5c is provided on the mounting plate 6 through which the secondary conductor 4 is exposed in an insulated state. A switching power supply transformer characterized in that a secondary outer pole 5 having a plate portion 5b is provided, and the secondary outer pole 5 is screwed onto the mounting portion 3c of the secondary conductor 3.