JPH03141623A - Electromagnetic device - Google Patents

Abstract

PURPOSE:To miniaturize and lighten it while maintaining high performance by providing bar-shaped exciting cores between the flanges of a yoke core whose section is H-shaped, and coiling the windings around exciting cores. CONSTITUTION:A yoke core 10 whose section is H-shaped and a pair of bar- shaped exciting cores 11 and 12 are both made of Mn-Zn ferrite. For the exciting cores 11 and 12, gaps 15 and 16 are made at both sides between itself and the flanges 13 and 14 of the yoke core 10. Furthermore, windings 17 and 18 are wound, through bobbins, around each exciting core 11 and 12, and currents are applied so that the magnetism may be reduced at the foot 9 of the yoke core 10. This way, an electromagnetic device, where bellow magnetic fluxes do not interfere with each other, can be constituted, and it can be miniaturized and lightened, with high performance maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnetic device used for chokes, transformers, etc. in switching power supplies, inverter lighting devices, and the like.

[Conventional technology]

In recent years, with the demand for smaller and lighter electronic devices, there has been a need for compact and high quality electronic components. The same is true in the field of switching power supplies and inverter lighting devices, where there are particularly strong demands on the main components, chokes and transformers.

These parts usually use a plurality of inductance elements, but there has been a strong need to integrate them into one piece to make them smaller and lighter.

Therefore, as shown in FIG. 11, an E-type core 70 and an I-type core 71, both made of Mn-Zn ferrite material, are combined, and windings 74.75 are connected to both leg portions 72.73 of the E-type core 70. There is a lithium-ion packing device that integrates two inductance elements made by winding a. Each winding 74.75 has
Electricity is applied so that the induced magnetic flux (arrows in the figure indicate the flow of magnetic flux) becomes demagnetized at the central leg 76 of the E-shaped core 70.

In this way, the magnetic flux density of the central leg 76 is reduced,
The cross-sectional area of the central leg portion 76 can be reduced.

[Problem to be solved by the invention]

The electromagnetic device shown in FIG. 11 has a problem in that the stored energy is small. Therefore, as shown in FIG. 12, there is an electric IF device in which a gap 77 is formed between an E-type core 70 and an I-type core 71 to increase the stored energy. However, in such an electromagnetic device, there is a problem that the magnetic resistance of the gear 2177 portion is large, and a part of the magnetic flux flowing to one side leg 72 flows to the other side leg 73, causing mutual interference. Ta.

Therefore, as shown in FIG. 13, a gear knob 82 is provided only on the side legs 79 and 80 of the E-shaped core 78, and the central leg 81 and the I-shaped core 71 are joined to prevent mutual interference in the electromagnetic device. There is. However, in such an electromagnetic device, in order to obtain sufficient stored energy, the gear knob 82 becomes too large, and the fringing magnetic flux at the gear and knob 82 portions is caused by the winding 7.
4.75, a new problem arises in that the copper loss increases significantly and the temperature rise also increases. Moreover,
There was a gap, although small, at the joint between the central leg portion 81 and the ■-shaped core 71, and there was also a problem of mutual interference.

As described above, it has been difficult to reduce the size and weight of conventional electromagnetic devices while maintaining high performance.

Therefore, an object of the present invention is to provide an electromagnetic device in which magnetic fluxes do not interfere with each other.

[Means for Solving the Problems] The Ti1ft device of the present invention includes a yoke core with an H-shaped cross section, a plurality of rod-shaped excitation cores provided between the flanges of this yoke core, and a winding wound around this excitation core. It is prepared.

[For production]

According to the electromagnetic device of the present invention, a plurality of excitation cores are provided between the flanges of a yoke core with a II-shaped cross section.The yoke core has an H-shaped cross section and the legs are integral with the flanges, so that magnetic fluxes do not interfere with each other.

〔Example〕

A first embodiment of the present invention will be described based on FIGS. 1 to 4.

3 and 4 show an exploded front view and a plan view of the core. In the figure, IO is a yoke core with an H-shaped cross section, and 11.12 is a pair of rod-shaped excitation cores, both of which are made of M'n-Zn ferrite (5B7C manufactured by Nippon Ferrite).
).

As shown in FIG. 2, the excitation cores 11.12 are connected to the collars 13.1 of the yoke cores 10 with gaps 15.16 formed at both ends.
Provided between 14. Furthermore, in each excitation core 11 12,
Winding 1 through a bobbin (not shown) as shown in Figure 1.
7.18 is wound and energized so that the leg portion 19 of the yoke core IO becomes demagnetized (arrows in the figure indicate the flow of magnetic flux).

Now, hypothetically, yoke core IO and excitation core 11°I2
The cross-sectional area of the winding 17 is set to 80 (mnr), the inductance between the terminals of the winding 17 is set to 11: mH), and the inductance between the terminals of the winding 18 is set to Q, 5 (mH).

Then, when a voltage was applied to the winding 18 and the inductance of the winding 17 was measured, it was found that the inductance value did not change and there was no mutual interference. Furthermore, winding 17. In order to investigate the influence of fringing magnetic flux on t8, we applied a voltage under the same conditions and
It was found that the temperature rise was approximately 10 degrees lower than the previous one.

According to the electromagnetic device configured in this way, the excitation core 11
Since gaps 15 and 16 were formed on both ends of 12,
The stored energy increases.

In addition, the yoke core lO has a cross section of 1] shape, and has a leg 19 and a collar 1.
3.14 are integrally formed, so that the magnetic flux of one does not flow into the magnetic path of the other and interfere with each other.

In addition, since gaps 1516 are formed at both ends of the excitation core 11.12, the size of each gap 15.16 is smaller compared to the conventional case where it is provided only on one side, and the winding 17.18 due to fringing magnetic flux is Temperature rise is small.

In addition, it has a magnetic shielding structure in which the excitation cores 11 and 12 are covered with the yoke core 10, so there is no magnetic flux leaking to the outside, there is no interaction between external components, there is no noise, and high-density mounting is possible.

In addition, the leg portion 19 of the yoke core lO has a reduction! (2) Since the magnetic flux flows, the magnetic flux density is low, so the cross-sectional area of the leg portions 19 can be reduced, and the electromagnetic device can be made smaller.

Furthermore, the yoke core 10 has an H-shaped cross section, and the flange 1314 and the leg portion 19 are integrally formed, so that the central leg portion of the E-type core and the I-type core are matched with each other as seen in the conventional El-type core. There are no problems and it is suitable for mass production.

A second embodiment of the invention is shown in FIGS. 5 and 6. Electricity+f! of this example! In the device, tapers 23, 24 are formed at both end corners of the flanges 21, 22 of a coke core 20 with an H-shaped cross section, and the excitation core 25, 26 is shaped like a rod with a circular cross section. Even in the electromagnetic device configured in this way, the same effects as in the first embodiment can be obtained.

A third embodiment of this invention is shown in FIGS. 7 and 8. The electromagnetic device of this embodiment has a yoke core 30 with an H-shaped cross section.
A total of four excitation cores 33, 34.
35 and 36 with gaps 37 and 38 formed at both ends. Each excitation core 33 to 36 has a winding 39,
40.4142 is wound, and the windings 39 to 42 are energized so that the legs 43 of the yoke core 30 are demagnetized (arrows in the figure indicate the flow of magnetic flux).

Even in the electromagnetic device in which four inductance elements are integrated in this manner, the same effects as in the first embodiment can be obtained. Note that the number of excitation cores is not limited to four.

A fourth embodiment of the invention is shown in FIGS. 9 and 10. The electromagnetic device of this embodiment includes a yoke core 50 having an H-shaped cross section with both flanges 51 and 52 circular, and four cores with gaps 53 and 54 formed at both ends between the flanges 51 and 52 of this yoke core 50. It consists of an excitation core 55 degrees 56, 57, 58, and a winding (not shown) wound around each excitation core 55 to 58.

Note that each winding is energized so that the leg portion 59 of the yoke core 50 becomes demagnetized.

Even in the electromagnetic device configured in this way, the same effects as in the first embodiment can be obtained.

In addition, in the case of each of the above embodiments, the excitation core is 11.12°25
．． 26, 33, 34, 35, 36, 55, 5657.5
Gap on both ends of 8 15.16.3738.53.64
However, the yoke cores 10 and 20 are connected without providing a gap.
．． Of course, those joined to 30.50 are also included in the present invention.

[Effects of the Invention]- According to the electromagnetic device of the present invention, a plurality of excitation cores are provided between the flanges of a yoke core with an H-shaped cross section, and the yoke core has an I-shaped cross section and the legs are integral with the flanges. Therefore, the effect that the magnetic fluxes do not interfere with each other can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the first embodiment of the invention, Fig. 2 is a partial front view thereof, Fig. 3 is a partially exploded front view thereof, Fig. 4 is a partially exploded plan view thereof, and Fig. 5 is a partial front view thereof. A partial front view of the invention;
6 is a partial plan view thereof, FIG. 7 is a partial front view of the third embodiment of the present invention, FIG. 8 is a sectional view thereof, and FIG. 9 is a partial perspective view of the fourth embodiment of the present invention. , FIG. 10 is a partial plan view thereof, FIG. 11 is a cross-sectional view of the conventional example, FIG. 12 is a cross-sectional view of another conventional example, and FIG. 13 is a cross-sectional view of still another conventional example. 10.20, 30.50...Yoke core, 11°12
．． 25.26, 33, 34, 35, 36.5556.5
7.58... Excitation core, 13, 14, 2122.31
．． 32 51.52...Tsuba, 17,1839.40.
41.42... Winding Figure 1 Figure 7 Figure 8 Figure 11 Figure 2 Figure 2

Claims (1)

[Claims] An electromagnetic device comprising a yoke core with an H-shaped cross section, a plurality of rod-shaped excitation cores provided between the flanges of the yoke core, and a winding wound around the excitation core.