JPS5821137Y2 - pot core - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pot core, and particularly to a pot core made of ferrite used in fields of relatively high power such as cores of transformers for switching power supplies.

Conventionally, ferrite cores have been widely used in fields that handle relatively small amounts of high-frequency power, but as switching power supplies have recently come to be used as stabilized power supplies for electronic devices, ferrite cores have been widely used in fields that handle relatively small amounts of high-frequency power. It is also being used as the core of transformers.

In this case, in order to reduce radiation noise due to leakage magnetic flux,
A pot core with a large magnetic shielding effect is often used.

1 to 3 show conventional pot cores used in the above applications.

Fig. 1 shows a square pot core 1. This square pot core 1 is integrally formed with a task part 2 and its periphery, and has a square prism surface on the outside and a circumferential surface on the inside. It is composed of a ring part 3 and a cylindrical slug part 4 formed integrally at the center of the task part 2, and has a cutout part 5 for drawing out the winding wire formed as necessary.

On the other hand, FIG. 2 shows a circular pot core, and this circular pot core 10 includes a task part 11 and a ring part 12 integrally formed on the periphery thereof and having a circumferential surface on both the outside and inside. and a cylindrical slug portion 13 integrally formed in the center of the disk portion 11,
It has a notch 14 formed as necessary for drawing out the winding wire.

Further, FIG. 3 shows a modified square pot core 20, which has a ring portion 22 with cutout surfaces 21 formed at the four corners, and is otherwise the same as the square pot core 1. The structure is as follows.

By the way, the above three types of pot cores 1, 10, and 20 are all equivalent in terms of magnetic properties, but when used in switching power supply transformers, etc., a large winding frame is required, so a square type pot core is used. In the pot core 1, the cross-sectional area of the ring part 3 inevitably becomes large, so the square pot core 1 is the worst in terms of the amount of material used, and the amount of material used decreases in the order of the modified square pot core 20 and the circular pot core 10.

On the other hand, when handling large amounts of power, the heat dissipation of the core must also be taken into account, and in this respect, the square pot core 1 has the largest surface area and has the greatest heat dissipation effect, and the modified square pot core 20
, the heat dissipation effect becomes worse in the order of circular pot core 10.

Therefore, with the conventional pot core 1,10°20, it was not possible to satisfy both of the 92 different demands of improving the heat dissipation effect and reducing the amount of material used.

In view of the above points, the present invention aims to provide a pot core that has good magnetic properties and heat dissipation effects and can reduce the amount of material used.

Embodiments of the pot core according to the present invention will be described below with reference to the drawings.

In FIGS. 4 and 5, the pot core 30 includes a disk portion 31, a ring portion 32 integrally formed on the periphery thereof, and a cylindrical slug portion 33 integrally formed at the center of the disk portion 31. It has a notch 34 formed as necessary for drawing out the winding wire.

Here, the outer surface of the ring portion 32 has a substantially rectangular prism surface, and furthermore, at the corners of the outer surface, there are small side surfaces 35 orthogonal to each other.
．． Corner recesses 37 each partitioned by 36 are formed.

Further, the inside of the ring portion 32 is a circumferential surface.

According to the above configuration, the following effects can be achieved.

(1) The surface area of the pot core 30 is equivalent to the surface area of the square pot core 1, and the heat dissipation effect is good.

(2) Since the corner recesses 37 are formed at the corners of the ring portion 32 that do not affect the magnetic properties, the amount of material used can be reduced without impairing the magnetic properties, which is economical.

(3) If the corner recess 37 is used to pass the screw 40 as shown in FIG. 5, the pot core 30 can be fixed to a board or the like with the screw, and the installation can be facilitated.

(4) The heat sink 50 can be easily mounted as shown in FIG. 6 by using the mounting screws 40 that pass through the corner recess 37.

In the above embodiment, the corner recess 37 is formed at the corner by the orthogonal small side surfaces 35 and 36, but the recess may be formed by mutually bending three or more small side surfaces.

As shown above, the present invention provides a pot core that has good magnetic properties and heat dissipation effects, and can reduce the amount of material used.

[Brief explanation of drawings]

Fig. 1 is a plan view showing a conventional square pot core, Fig. 2 is a plan view showing a conventional circular pot core, Fig. 3 is a plan view showing a conventional modified rectangular pot core, and Fig. 4 is a plan view showing the conventional modified rectangular pot core. A perspective view showing an example of such a pot core, FIG. 5 is a plan view of the same,
FIG. 6 is a side view when a heat sink is attached. 1... Square pot core, 2, 11.31...
...Task part, 3.12.32...Ring part, 4,13.33...Slug part, 35°3
6...Small side, 37...Corner recess, 40
...screw, 50...heat sink.

Claims (1)

[Scope of utility model registration request] In a pot core consisting of a disk portion, a ring portion integrally formed on the periphery thereof, and a slug portion integrally formed at the center of the disk portion, the outer surface of the ring portion is formed into a substantially square prism shape. A pot core made of ferrite for a switching power supply, characterized in that a corner recessed portion consisting of two small side surfaces that intersect with each other is formed at four corners of the outer surface thereof.