JP2003152491A - Cell type noise filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of matching with an actual device, and the problem that it is difficult in many cases to immediately satisfy an EMI (Electromagnetic Interference) standard value of the device, in a commercially available noise filter with a specified circuit structure, and the problems of cost, delivery times, the number of developing steps of technology, etc., in a modified noise filter because of individual dealing. SOLUTION: Reference numerals L1 , L2 denote inductance coils, and reference numerals CX1 , CX2 , CY1 , and CY2 denote capacitors. Since inductance values of circuit components L and capacitance values of circuit components C can be modified, various types of basic cell type noise filters can be manufactured. Also, in filter characteristics, countermeasures matching with a load can be taken by selecting and combining cell type noise filters for low-frequency band or for high-frequency band. Accordingly, with combinations of cell type noise filters, countermeasures against EMI corresponding to an actual device can be taken easily and surely at the site.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to general control equipment, N
Noise filters used in C control equipment, various electronic equipment, and other industrial equipment, especially EMI (Electromagnet)
ic Interference) Cell type noise filter for satisfying the standard.

[0002]

2. Description of the Related Art As a conventional EMI countermeasure, a commercially available noise filter having a predetermined circuit configuration is used or a noise filter having a custom circuit configuration is used.

FIG. 6 shows an example of specifications of a commercially available noise filter in a conventional example. FIG. 6A is a circuit configuration diagram thereof, and FIG.
Is a damping characteristic diagram under the recommended conditions. Figure 6 (a)
In, L1 and L2 are inductance coils,
Cx1, Cx2, Cy1 and Cy2 are capacitors.
The suffix Y represents ground connection and X represents line connection. A specific inductance value L and a specific capacitance value C are attached to the printed circuit board. Also,
The input impedance Zi and the output impedance Zo by standard use are also defined.

In FIG. 6 (b), is the attenuation characteristic diagram in the first specification example of the commercially available noise filter, is the attenuation characteristic diagram in the second specification example of the commercially available noise filter, and is the third specification example of the commercially available noise filter. The attenuation characteristic figure in is shown. However, the connection impedance is 50Ω.

[0005]

However, in the case of using a conventional noise filter having a commercially available fixed circuit configuration,
In many cases, the EMI standard value of the device cannot be immediately satisfied due to a matching problem with the actual device. In addition, when the modified noise filter whose circuit configuration is individually decided by custom is used, cost, delivery time, man-hours for technological development, etc. are problems because they are individually supported.

The present invention has been made in view of the above circumstances, and eliminates a mismatch with an actual machine when a commercially available noise filter having a predetermined circuit configuration is used and a modify noise filter is used. It is an object of the present invention to provide a cell-type noise filter that eliminates the cost, delivery time, man-hours for technological development, etc.

[0007]

In order to solve the above-mentioned problems, the cell type noise filter of the present invention is characterized in that it is composed of an LC circuit consisting of L and C which is a basic element on a printed circuit board. is doing.

Further, the cell type noise filter of the present invention is
The circuit pattern of the printed circuit board forming the LC circuit is characterized in that various inductance values L and various capacitance values C can be attached.

Further, the cell-type noise filter of the present invention is characterized in that a plurality of arbitrary combinations can be made through connection fittings that enable the respective printed boards to be connected in series with each other. There is.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Conventionally, there was no product of the idea of combining noise filters into cells and combining them. This time, it is possible to make various kinds of circuit constants and configurations by making noise filters into cells and combining them, and there is an advantage that an optimum noise filter configuration can be made. Besides, there are the following merits. In the past, custom-made one-by-one correspondence was made, but at the site, by combining a cell-type noise filter, it is possible to easily take EMI countermeasures suitable for the actual machine and shorten the delivery time.

Further, an arbitrary circuit configuration can be constructed by combining the cell type noise filters. In the simplest example, the attenuation characteristics differ even if the input and output are reversed. Furthermore, by combining a plurality of narrow band cell type noise filters for each frequency band, it is possible to narrow down to a wide band or a specific frequency band.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram of a cell type noise filter according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a basic cell type noise filter, which includes inductance coils L1 and L.
2 and capacitors Cx1, Cx2, Cy1 and Cy2. The suffix Y represents ground connection and X represents line connection. Since various inductance values L and capacitance values C can be attached to the printed circuit board, various basic cell type noise filters 1 can be manufactured.

Further, depending on the winding method, for low frequency band,
An L element of a cell type noise filter for a high frequency band is manufactured. Therefore, in the filter characteristics, the low frequency type and the high frequency type can be matched with the load.

FIG. 2 is a cell type noise filter circuit diagram derived from the basic cell type noise filter in the embodiment of the present invention. It is exactly the same as FIG. 1 except that Cx1 is removed, and the description of the reference numerals is omitted. Also, in FIG. 2, as in FIG. 1, various inductance values L and capacitance values C can be attached to the printed circuit board, so that various derivative cell type noise filters 2 can be provided.
Can be produced.

FIG. 3 is a diagram showing an example in which a plurality of cell type noise filters according to the embodiment of the present invention are combined. In the figure, one example of using the cell type noise filter, two examples of using the cell type noise filter in two stages, and three examples of using the cell type noise filter in three stages are shown. A, B, C and D are various basic cell type noise filters or derived cell type noise filters. An enormous noise filter circuit can be constructed by combining a plurality of these various cell type noise filters.

It is to be noted that, by constructing the connecting portions (input / output terminals) of the cell type noise filter so that they can be connected in series with each other, arbitrary plural combinations can be easily and surely performed freely. Further, a cell type noise filter circuit combining the above is assembled in a chassis.

FIG. 4 is a diagram for explaining the two-stage use of the cell type noise filter in the embodiment of the present invention, and is a block configuration diagram used for general control equipment. In the figure, the output of the basic cell type noise filter 1 is connected to the input of the derived cell type noise filter 2 by a connecting fitting 6. Also,
The output of the derivative cell type noise filter 2 is connected to the general control device 3. Furthermore, the basic cell type noise filter 1
The connection point between Cy1 and Cy2 and the connection point between the derived cell type noise filter 2 and Cy1 and Cy2 are both connected to the general control device 3 as ground. It should be noted that the connecting fitting 6 may have an appropriate structure so that when the substrates are combined to form a filter circuit having desired characteristics, they can be easily coupled to each other to connect or separate.

FIG. 5 is a diagram for explaining the characteristics of a combination of filters. (A) is a characteristic diagram of cell type noise filters (one-stage products) A and B having different capacitance values, (b)
FIG. 4 is a characteristic diagram in which cell type noise filters A + B are combined. Cell type noise filters A and B having different capacitance values were actually made, and the characteristics of the combination of the cell type noise filters A + B were examined and evaluated.

The solid line A in (a) shows the noise level characteristic of the cell type noise filter of arbitrary capacity, and the chain line B shows the noise level characteristic of the cell type noise filter of arbitrary capacity. As is clear from (b), by combining two cell type noise filters A and B having different capacitance values, it is possible to obtain wide band characteristics with large attenuation over a wide band.

[0020]

As described above, according to the cell type noise filter of the present invention, the basic noise filter is formed on the printed circuit board by the LC circuit composed of L and C, and
The circuit pattern of the printed circuit board forming the C circuit is
Various inductance values of L and capacitance values of C can be attached. Furthermore, since a plurality of printed wiring boards can be connected in series with each other, a plurality of arbitrary combinations can be made. By combining the cell type noise filter at the site, it is possible to easily take the EMI countermeasure suitable for the actual machine and shorten the delivery time.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a cell type noise filter according to an embodiment of the present invention.

FIG. 2 is a cell type noise filter circuit diagram derived from a basic cell type noise filter in the embodiment of the invention.

FIG. 3 is a diagram showing an example in which a plurality of cell type noise filters are combined in the embodiment of the present invention.

FIG. 4 is a diagram illustrating a two-stage usage of the cell type noise filter in the embodiment of the present invention, and is a block configuration diagram used in a general control device.

FIG. 5 is a diagram for explaining characteristics due to a combination of filters. (A) is a characteristic diagram of the cell type noise filters A and B having different capacitance values, and (b) is a characteristic diagram in which the cell type noise filters A + B are combined.

FIG. 6 is a specification example of a commercially available noise filter in a conventional example, (a) is a circuit configuration diagram thereof, and (b) is an attenuation characteristic diagram under the recommended conditions.

[Explanation of symbols]

1 Basic cell type noise filter 2 Derived cell type noise filter 3 General control equipment 6 connection fittings 10 noise filter L1, L2 inductance coil Cx1, Cx2, Cy1, Cy2 capacitors ,, Standard filter attenuation characteristics

Continued front page    (72) Inventor Satoshi Matsuo             5-30 Chiyoda, Sakado City, Saitama Stock             Company Tamura Seisakusho Office (72) Inventor Masuhisa Akita             5-30 Chiyoda, Sakado City, Saitama Stock             Company Tamura Seisakusho Office F-term (reference) 5J024 AA01 CA06 DA01 DA25 DA32                       EA08

Claims (3)

[Claims] 1. A cell type characterized in that a basic noise filter is composed of an LC circuit consisting of an inductance coil (hereinafter abbreviated as L) and a capacitor (hereinafter abbreviated as C) on a printed circuit board. Noise filter. 2. The circuit pattern of the printed circuit board which constitutes the LC circuit can be attached with various inductance values L and various capacitance values C.
Cell type noise filter described in. 3. The cell type according to claim 1, wherein a plurality of arbitrary combinations can be made through connecting metal fittings capable of connecting the respective printed boards in series with each other. Noise filter.