JPS598344Y2 - High voltage LC composite parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-voltage LC composite component used as a line filter for a magnetron tube used in high-frequency, high-power devices, such as microwave ovens.

Recently, high-power electromagnetic waves in the UHF and VHF bands have come to be used not only in industrial equipment such as broadcasting equipment, but also in consumer equipment such as microwave ovens, and as their use increases, leakage from these equipment increases. Noise pollution caused by electromagnetic waves has come to the fore as a major social problem.

In order to prevent such noise pollution, various line filters have been proposed.

FIG. 1 shows a conventional example of a high voltage LC composite component designed to prevent noise in a magnetron tube.

In this conventional example, mutually independent electrodes 2 a and 2 b and a common electrode 3 are arranged around the through holes la and 1 b on both sides of a flat dielectric ceramic 10 provided with two through holes la and lb. At the same time, the common electrode 3 of the dielectric ceramic 1 is soldered and fixed onto the other electrode 5b of the high voltage ceramic capacitor 5, which has one electrode 5a soldered and fixed on the grounding fitting 4, and further fixed with ferrite or the like. One end 7 a , B a of the coils 7 and 8 wound on the rod-shaped magnetic body 6
are led out through the through holes 1a and 1b, electrically connected to the electrodes 2a and 2b by soldering or conductive adhesive, respectively, and the entire structure is molded with an insulator 9.

The insulator 9 is made of SiO2, A1203, Fe as a filler.
203 etc. is uniformly dispersed in the grounding fitting 4, the insulation case 10 and the insulation pusher ll.
It is shaped by 1 by casting into a, llb.

In order to use the above-mentioned high voltage LC composite component as a line filter for a magnetron tube such as a microwave oven, the coil terminals 7b and 8b of the inductance coils 7 and 8 are
Heater 12b of magnetron tube 12 whose anode is grounded
Connect each in series.

FIG. 2 is an equivalent circuit diagram in that case, where Ll and L2 are the inductances caused by the coils 7 and 8, and C1 and C2 are the inductances between the electrodes 2 a and 2 b provided on the dielectric ceramic 1 and the common electrode 3. The capacitance of the shaped feedthrough capacitor, C3, is the capacitance due to the ceramic capacitor 5.

Normally, only a few square meters of voltage is applied to the heater 12b of the magnetron tube 12, but the anode 12a and heater 12
A high voltage of about 500 V to 3 KV is applied between the

This high voltage is shared by capacitor C3 and capacitor C1 or C2.

In this case, the relationship between capacitances C1, C2 and capacitance C3 is expressed as C1=
If C2>>C3 is selected, the voltage sharing of the capacitor is inversely proportional to the capacitance value, so the working voltage is 500
Most of the voltage (1) to 3 KV is applied to the ceramic capacitor 5 that constitutes the capacitor C3, and the voltage sharing of the feedthrough capacitor that constitutes the capacitors C1 and C2 is significantly reduced.

As is clear from the specific structure of FIG. 1, increasing the withstand voltage of the feedthrough capacitor is structurally extremely difficult, but increasing the withstand voltage of the ceramic capacitor 5 is relatively easy due to its increased thickness. I can do it.

Therefore, the relationship between capacitances C1, C2, and C3 is C1=C2
>>Selecting the relationship C3 is also structurally consistent.

Moreover, by selecting large values for the capacitances C1 and C2, the thickness of the dielectric ceramic 1 can be reduced, reducing costs, and at the same time improving the function as a filter.

In other words, the conventional high-voltage LC composite component shown in Figure 1 has a grounded capacitor connected to the feed-through capacitor, which has the excellent effect of increasing the filtering effect and improving dielectric strength at the same time. be able to.

Further, since the grounding capacitor 5 is directly fixed to the grounding metal fitting 4, there is an advantage that the capacitor 5 has a small self-inductance and a high self-resonance frequency.

Furthermore, since the coils 7, 8 and capacitors 1, 5 are integrated and molded inside the insulator 9, they are compact and highly reliable, and are easy to install and handle when attached to a magnetron tube, etc. It has certain features such as:

It is an object of the present invention to provide a high voltage LC composite component that further improves the function as a filter without losing the above-mentioned conventional advantages.

In order to achieve the above object, the high voltage LC composite component according to the present invention includes an inductance coil, a cylindrical magnetic body through which a lead wire led from the inductance coil passes, and a cylindrical magnetic body through which a lead wire led from the inductance coil passes through the magnetic body. A feedthrough capacitor having a lead wire passed through it and conductively connected to one of the electrodes, a grounding capacitor having one of the electrodes fixed to the other electrode of the feedthrough capacitor and the other electrode fixed to a grounding fitting, and the feedthrough capacitor A cylindrical magnetic body provided through the grounding fitting to allow the lead wire to pass through the magnetic body, and a magnetic block to allow the lead wire to pass through the magnetic body, excluding the inductance coil. The feature is that each part is embedded in an insulator and integrated.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The content of the present invention will be specifically explained in detail below with reference to the accompanying drawings, which are examples.

3 is a front sectional view of the high voltage LC composite component according to the present invention, FIG. 4A is a sectional view taken along line A-A in FIG. 3, and FIG. 4B is a sectional view taken along line B-B in FIG. 3. It shows.

In the figure, the same reference numerals as in FIG. 1 indicate the same structural parts.

13 and 14 are magnetic bodies shaped into a cylinder using ferrite beads.

Lead wires 7a and ga, which are the coil terminals of the inductance coils 7 and 8, are passed through the magnetic bodies 13 and 14.

Reference numerals 15 and 16 denote conductors for electrically connecting the electrodes 2a, 2b of the dielectric ceramic 1 and the lead wires 7a, 8a, and are fixed to each by means such as soldering.

The conductor 15.16 also functions as a support for supporting the magnetic body 13.14 from below.

17 and 18 are cylindrical magnetic bodies made of ferrite beads provided through the grounding fitting 4.

The magnetic bodies 17 and 18 are fitted into the insulating pushpieces 19 and 20, and then penetrated through the grounding fitting 4, and further penetrated through the dielectric ceramic 1 serving as the feedthrough capacitor, and then the lead wires 7a and 8a.
It is passed through.

In this case, a high voltage of about 500 to 3 Kv is applied between the grounding fitting 4 and the lead wires 7a, 8a, but the ferrite beads 17, 18 themselves are excellent insulators, and the ferrite beads 17, 18 are themselves excellent insulators. Insulated push 18 19.2
Since the structure is such that it is fitted within 0, sufficient dielectric strength can be ensured.

The magnetic bodies 13 and 14, the feedthrough capacitor, and the grounding fitting 5
The magnetic bodies 17, 18, etc. are molded with an insulator 9 and integrated onto the grounding fitting 4.

The insulator 9 is made of SiO2, A 1 2 as a filler.
It is formed by casting a composite resin or composite rubber in which 0a, Fe203, etc. are homogeneously dispersed.

In this embodiment, the inductance coils 7 and 8 are wound on independent cores 6A and 6B, but as shown in FIG. It is also possible to have a similar structure.

It is also possible to mold the inductance coils 7, 8 within the insulator 9.

21 is a magnetic block made of ferrite beads shaped into a rectangular parallelepiped, for example.

The magnetic material block 21 is provided below the grounding fitting 4, and the lead wires 7a and 7a after passing through the magnetic material 17 and 18,
8a is passed through.

In this embodiment, the magnetic block 21 is constructed by overlapping an upper block 21A and a lower block 21B, which are independent from each other, but depending on the size,
It can be further subdivided, or conversely, it can be constructed as a single unit without being divided.

22 is the magnetic block 21 on the lower side of the grounding fitting 4.
The inside of the case is fitted with an insulating material 23 to fill the space between the magnetic block 21, the grounding fitting 4, etc.

The insulator 23 is made of the same material as the insulator 9 described above.

24 and 25 are terminals provided at the lead-out portions of the lead wires 7a and 8a.

FIG. 5 is an equivalent circuit diagram of a high voltage LC composite component according to the present invention.

As is clear from the figure, the high voltage LC composite component according to the present invention has magnetic materials 13, 14, magnetic materials 17, 18, and The inductances L3 to L8 caused by the magnetic block 21 are connected to the lead wires 7 a and B of the inductance coils 7 and 8.
The circuit structure is inserted and connected in series to a,
The number of filter elements increases accordingly.

Therefore, it is clear that the high voltage LC composite component according to the present invention can provide a better noise reduction effect than those shown in FIGS. 1 and 2.

In addition, the magnetic bodies 13, 14, 17, 18 and the magnetic block 21 are provided by utilizing the conventional dead space, and the performance is improved without increasing the size. can be done.

Furthermore, since the lead wires 7a and Ba pass through the magnetic bodies 17 and 18 formed from ferrite beads at the part where they pass through the grounding fitting 4, it is possible to improve the noise reduction effect while increasing the dielectric strength. High efficiency.

In addition, when an inductance element is made of a magnetic material, which is generally better than a ferrite bead, the larger the volume of the inductance element, the larger the inductance. In this case, the inductance L7,L
8 can be taken out, and a product with high noise reduction effect can be obtained.

As shown in FIG. 6, the feedthrough capacitor can also be divided into two independent dielectric ceramics IC and ID.

It is also possible to use semiconductor ceramic instead of dielectric ceramic to form a semiconductor ceramic feedthrough capacitor.

In the case of a semiconductor ceramic feedthrough capacitor, it is possible to obtain a capacitance 10 times or more that of a dielectric ceramic capacitor, so that an even better noise reduction effect can be obtained.

As explained in detail above, the high voltage LC composite component according to the present invention includes an inductance coil, a cylindrical magnetic body through which a lead wire led from the inductance coil passes, and a lead after passing through the magnetic body. A feedthrough capacitor with a wire passed through it and electrically connected to one of the electrodes, a grounded capacitor with one electrode fixed to the other electrode of the feedthrough capacitor and the other electrode fixed to a grounding fitting, and a grounded capacitor with a wire passed through the feedthrough capacitor It is characterized by comprising a cylindrical magnetic body that is inserted through the grounding fitting so that the subsequent lead wire can pass therethrough, and a magnetic body block that allows the lead wire that has passed through the magnetic body to pass through. High voltage L with improved noise reduction effect without sacrificing the advantages of this type of high voltage LC composite parts.
D Composite parts can be provided.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a conventional high-voltage LC composite component, Figure 2 is an equivalent circuit diagram when the high-voltage LC composite component shown in Figure 1 is used as a filter for a magnetron tube, and Figure 3 is the present invention. Cross-sectional view of the high-voltage LC composite component related to Figure 4 A and B
are side cross-sectional views taken along lines A-A and B-B in FIG. 3, respectively, FIG. 5 is an equivalent circuit diagram of a high-voltage LC composite component according to the present invention, and FIG. 6 is a cross-sectional view of another embodiment. be. 1... Penetration Container, 4... Grounding Metal Fitting, 5... Grounding Container, 7, 8...
...Inductance coil, 7a, 8a...
Lead wire, 13.14...Magnetic material, 17,18
...Magnetic material, 21...Magnetic material block.

Claims (3)

[Scope of utility model registration request] (1) an inductance coil and a cylindrical magnetic body through which a lead wire led from the inductance coil is passed;
A feedthrough capacitor in which a lead wire that has passed through the magnetic material is passed through and electrically connected to one of the electrodes, and a grounding device in which one of the electrodes is fixed to the other electrode of the feedthrough capacitor and the other electrode is fixed to a grounding fitting. A capacitor, a cylindrical magnetic body penetrating the grounding fitting to allow the lead wire to pass through the feedthrough capacitor, and a magnetic block that penetrates the magnetic body and allows the subsequent lead wire to pass through. A high voltage LC composite component characterized by: (2) The high voltage LC composite component according to claim 1, wherein the magnetic material and the magnetic material block are made of ferrite beads. (3) The high-voltage LC composite component according to claim 1 or 2, wherein each part except the inductance coil is embedded and integrated within an insulator.