JPS6032743Y2 - choke coil - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a choke coil with a heat sink.

Choke coils used in filter circuits such as the output of switching regulators are generally constructed by winding a coil around a toroidal iron core, but it is already known that this choke coil generates a considerable amount of heat when used. If the heat is left unchecked, it will have an adverse effect on other heat-sensitive electronic circuit components such as semiconductor elements, so some kind of countermeasure is needed.

Furthermore, as mentioned above, choke coils are usually incorporated together with other electronic circuit components, for example, on a board.
As the packaging density increases, it is necessary to take measures to effectively suppress heat generation on each component side.

The present invention was proposed in view of the above points, and its purpose is to radiate heat generated by the choke coil by integrally attaching a radiator with radiation fins to the choke coil equipped with a toroidal iron core. The aim is to quickly dissipate it through the vessel.

The present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In FIG. As is well known, the heat radiator 2 is made of a material with good thermal conductivity, has a generally semicircular shape, and has a large number of radially extending heat radiating fins 2a formed on its outer circumference.

Further, the arc of the inner circumferential surface of the heat radiator 2 is formed to correspond to the outer circumferential surface of the toroidal iron core 1, and the outer circumferential surface of the heat radiator 2 is connected to the outer circumference of the toroidal iron core 1. ing.

Therefore, when assembling the choke coil, as shown in Figure 0, the heat sink 2 is joined onto the outer periphery of the toroidal iron core 1, and then the coil 3 is assembled using a winding machine (not shown).
By winding it around it, a choke coil can be constructed.

Note that the heat sink 2 is approximately 172 cm from the outer peripheral surface of the toroidal iron core 1.
In other words, it is joined over approximately half the local area, and when the coil 3 is wound, the heat radiating fins 2 are joined in the heat radiator 2 part.
It is sufficient to wind the coil 3 through the toroidal iron core 1 between a and 2a, thereby connecting the heat sink 2 to the toroidal iron core 1.
It is possible to fix it to

FIG. 2 shows another embodiment of the heat sink used in the present invention, and in this embodiment, the length of the heat dissipation fins 2a' is formed to be gradually shorter toward both ends, with the center being the apex. It has certain characteristics.

Therefore, in this embodiment, as shown in FIG. 3, when the choke coil is erected on the substrate 5 using the support member 4, the length of the radiation fins 2a' at both ends is short. Other electronic components 6.7 can be installed nearby.

In other words, if the heat dissipation fins are long, the space factor on the board becomes high, which may restrict the attachment of other electronic components 6 and 7, or increase the size of the device. Since the radiation fin 2a' is formed to have a short length, other electronic components 6 and 7 can be placed adjacent to each other, and the mounting density on the board 5 can be increased compared to the previous embodiment. .

As described above, according to the present invention, a radiator having a large number of radially extending radiating fins formed on the outer periphery is joined to the ring-shaped toroidal iron core over approximately half the outer periphery, and the radiator and the toroidal iron core Since the heat radiator is attached and fixed via the coil wound around the toroidal core, there is no need to use adhesive or separately manufactured fixtures when attaching the heat radiator to the toroidal iron core. This has the advantage of preventing high costs, being easy to install and fix, and being able to quickly dissipate heat generated during use to the outside via the radiator.

Further, since the heat sink is provided on a part of the outer periphery of the toroidal iron core, an increase in size is prevented and the mounting density on the printed circuit board is not reduced.

It goes without saying that the heat sink used in the present invention can be applied not only to choke coils having a toroidal iron core but also to toroidal transformers.

[Brief explanation of the drawing]

Figure 1 shows one embodiment of the present invention, Figure A is an exploded perspective view, Figure 0 is a side view of a choke coil with a heat radiator, Figure 2 is another embodiment of the heat radiator, and Figure 3 is the same as above. FIG. 2 is an explanatory diagram showing a state in which a heat sink is installed on a substrate. 1...Troidal iron core, 2...Radiator, 2a. 2 a/...Radiating fin.

Claims (1)

[Scope of utility model registration request] A radiator having a large number of radially extending radiating fins formed on the outer periphery is joined to a ring-shaped toroidal iron core over approximately half the outer periphery, and a coil is wound around the radiator and the toroidal iron core. A choke coil formed by attaching and fixing the heat radiator.