JP3197598B2 - Electromagnetic converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic converter for transforming an input AC signal by electromagnetic induction and outputting the converted signal.

[0002]

2. Description of the Related Art In general, a transformer is used as an electromagnetic conversion device for transforming a plurality of input AC signals having mutually different frequencies by electromagnetic induction and outputting the transformed signals.
Here, as the ideal transformer, a transformer that performs only the transformation action without loss is desirable.

FIG. 7 shows a conventional electromagnetic conversion device used for such a purpose.
Are a plurality of AC signals having mutually different frequencies inputted through the common transmission line 31, for example, frequencies f1 and f2
Two input-side filter units 34 and 35 disposed on the branch transmission lines 32 and 33 so as to split two AC signals (f1 <f2), respectively, and these input-side filter units 34 , 35 and one input-side winding 36 which is provided corresponding to the input-side winding 36 and forms a common closed magnetic path with the input-side winding 36.
A transformer 40 having two output windings 38, and a different frequency f provided for each output winding 38.
It has two output-side filter means 41 and 42 for passing two AC signals of 1 and f2.

[0004] The transformation means 4 of such an electromagnetic conversion device 30
By inputting two AC signals of frequencies f1 and f2 with respect to 0 and transforming the signals by electromagnetic induction, two AC signals of frequencies f1 and f2 can be output.

However, the common input side winding 36 and the output side winding 38 provided in the transformation means 40 cause the frequency f1,
When the two AC signals of f2 are transformed and output, it is difficult to flatten the transmission characteristics of the transforming means 40, and thus the curve has a curved characteristic as shown in FIG. For this reason,
As shown in FIG. 6, f1 and f2 have to be arranged at points having characteristics deviated from each other, and do not have desirable transmission characteristics.

For this reason, as shown in FIG. 8, two input-side windings 36 and 37 and two output-side windings 38 and 39 corresponding to two AC signals of input frequencies f1 and f2 are provided. Is provided. According to the electromagnetic conversion device 50, two input signals of the respective frequencies f1 and f2 can be selected to optimum values as shown in FIG. 5, so that desirable transmission characteristics can be obtained.

[0007]

By the way, in the electromagnetic conversion device 50 shown in FIG. 8, although a plurality of AC signals having different frequencies f1 and f2 can be transformed with desired transmission characteristics and output, a plurality of AC signals can be converted to a plurality of frequencies. Since a corresponding number of input side windings 36 and 37 and output side windings 38 and 39 must be provided, when inputting an AC signal of a plurality of frequencies, the number of winding parts increases and the cost increases. There is.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and outputs an AC signal with desirable transmission characteristics without increasing the number of winding components even when a plurality of AC signals having different frequencies are input. It is an object of the present invention to provide an electromagnetic conversion device capable of performing the above.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an electromagnetic conversion device for transforming an input AC signal by an electromagnetic induction action and outputting the converted signal. A plurality of input-side filter means for passing a signal, an input-side winding connected to each of the input-side filter means and having an (N-1) intermediate tap;
An output winding provided corresponding to the input winding and having an output winding having an (N-1) intermediate tap forming a common magnetic path with the input winding; and a plurality of output-side filter means for passing a plurality of AC signals consisting of different frequencies is connected to the line, the input side
The winding and the output side winding are each wound integrally on the magnetic core.
It is characterized by having been done.

[0010]

With respect to the transformation means, an input winding connected to each input filter means and having an intermediate tap of (N-1), and an input winding provided corresponding to the input winding and provided with an input winding. And an output winding having an (N-1) intermediate tap forming a common magnetic path. Thus, even when inputting AC signals having a plurality of different frequencies, it is not necessary to increase the number of input windings and output windings only by increasing the number of intermediate taps between the input windings and the output windings. There are no winding parts, so there is no increase.

[0011]

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

FIG. 1 is a block diagram showing a first embodiment of the electromagnetic transducer of the present invention. This embodiment electromagnetic conversion device 15
Are a plurality of AC signals having mutually different frequencies inputted through the common transmission line 1, for example, frequencies f1 and f2
(2) arranged on the branch transmission lines 2 and 3 so as to split two AC signals (f1 <f2).
One input-side filter means 4, 5; an input-side winding 6 connected to each of the input-side filter means 4, 5 and having one intermediate tap 7; A transformer 10 comprising an input winding 6 and an output winding 8 having one intermediate tap 9 forming a common closed magnetic circuit; and a different frequency f connected to the output winding 8 and having a different frequency f.
It has two output side filter means 11 and 12 for passing two AC signals consisting of 1 and f2.

Here, the terminals a and b of the input winding 6 connected to the input filter means 4 corresponding to the frequency f1.
The input impedance between the terminals b and c connected to the input filter means 5 corresponding to the frequency f2 is defined as Z2, and the input impedance between the terminals b and c corresponding to the frequency f2 is defined as Z2. 11, the output impedance between terminals a and b connected to Z3 and frequency f
Assuming that the output impedance between the terminals b and c connected to the output-side filter means 12 corresponding to 2 is Z4, Z1 and Z3 are set substantially equal and Z2 is set substantially equal to Z4. Further, Z1 is set not to be equal to Z2 and Z4, and Z3 is set to Z2 and Z4.
Is set not to be equal to

By setting the number of windings (impedance) in this manner, impedance matching is achieved between the frequencies f1 and f2 with respect to the common transformer 10.

The transformation means 10 includes an endless annular magnetic core 10a.
And an input winding 6 having three terminals a, b, and c wound around one side end of the annular magnetic core 10a and connected to the two input filter means 4, 5, respectively. An output winding having three terminals a, b, c connected to the two output filter means 11, 12 corresponding to the input winding 6 and wound around the other end of the magnetic core 10a. The input side winding 6 and the output side winding 8 form a common closed magnetic path via an annular magnetic core 10a. here
Each of the input side winding 6 and the output side winding 8 is magnetic.
It is wound integrally on the core 10a (that is, divided
Not winding).

The two output side filter means 11 and 12 are:
It has the same configuration as the input-side filter means 4 and 5 and selectively transmits only the output signal of the frequency to be transmitted among the induced signals induced by the output-side winding 8.

In the electromagnetic converter 15 having the above configuration, the two AC signals of the frequencies f1 and f2 output from the input side filter means 4 and 5 are transformed by the common transforming means 10, and the respective output signals are output. Side filter means 11, 12
Thus, the signal is divided into AC signals for each of the frequencies f1 and f2, and is output with desirable transmission characteristics as shown in FIG.

As described above, according to the electromagnetic conversion device 15 of this embodiment, when two AC signals having mutually different frequencies f1 and f2 are input, the input side filter units 4, 5 , And one intermediate tap 9 provided corresponding to the input winding 6 and forming a common magnetic path with the input winding 6. Since the output side winding 8 is provided, even when two AC signals having mutually different frequencies f1 and f2 are input, the intermediate taps 7 and 9 are connected to the input side winding 6 and the output side winding 8, respectively. Only by providing
As described above, transmission characteristics with little attenuation are obtained at the frequencies f1 and f2. Therefore, mutually different frequencies f1 and f2
Even when two AC signals are input, there is no need to increase the number of input side windings 6 and output side windings 8, so that the number of winding components does not increase, so that an increase in cost can be avoided.

FIG. 4 shows transmission characteristics actually obtained by the present embodiment. Two points P1 and P corresponding to FIG.
2 provides the least attenuation.

FIG. 2 shows a second embodiment of the present invention. The electromagnetic conversion device 18 of this embodiment is configured as a transformation means 20 in which a side surface shape in which an air gap G is partially formed is substantially C-shaped.
A magnetic core 20a having a character shape is provided.
The input side winding 6 having the same three terminals a, b, and c as in the above embodiment is wound around the side end of
A part of the C card 22 is inserted.

As shown in FIG. 3, the output winding 8 wound around a cylindrical magnetic core 25 is provided on the IC card 22.
Each of the output side filter means 11 and 12 connected to the output side winding 8 is built in, and has the same configuration as that of the above embodiment except that an air gap G is interposed. According to the electromagnetic transducer 18 of this embodiment, the same effects as those of the above embodiment can be obtained. further,
The presence of the air gap G also makes it possible to insulate the input side and the output side.

In each embodiment of the present invention, an AC signal is input from each of the filter means 4 and 5, but an AC signal may be input from each of the filter means 11 and 12. In this case, each of the filter means 4 and 5 functions as an output-side filter means.

In each of the embodiments, two AC signals having the frequencies f1 and f2 are input. However, it is also possible to input three or more types of AC signals. In this case, if a plurality of types of frequencies are indicated by N, the number of intermediate taps drawn from the input side winding and the output side winding provided in the common transformation means is indicated by (N-1).

Even when three or more AC signals are input as described above, the number of intermediate taps is increased and the number of input windings and output windings is not increased. Obtainable.

[0025]

As described above, according to the present invention, an input side winding and an output side winding each having an intermediate tap are provided according to a plurality of AC signals input to a common transformer. Therefore, even when a plurality of AC signals having different frequencies are input, it is not necessary to increase the number of input windings and output windings.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the electromagnetic conversion device of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the electromagnetic conversion device of the present invention.

FIG. 3 is a perspective view showing an internal configuration of the IC card used in FIG. 2;

FIG. 4 shows transmission characteristics of a plurality of AC signals obtained by the first embodiment.

FIG. 5 shows desirable transmission characteristics when a plurality of AC signals are transformed and output.

FIG. 6 shows transmission characteristics obtained by a conventional electromagnetic conversion device.

FIG. 7 is a block diagram showing a conventional electromagnetic conversion device.

FIG. 8 is a block diagram showing another conventional electromagnetic conversion device.

[Explanation of symbols]

 4,5 Input side filter means 6 Input side winding 7,9 Middle tap 8 Output side winding 10,20 Transformation means 11,12 Output side filter means 15,18 Electromagnetic converter 22 IC card

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hirokazu Miyamoto 1-1-13 Nihonbashi, Chuo-ku, Tokyo Inside TDK Corporation (56) References JP-A-3-18002 (JP, A) (58) Survey Field (Int.Cl. ⁷ , DB name) H01F 21/12

Claims (1)

(57) [Claims] 1. An electromagnetic converter for transforming an input AC signal by an electromagnetic induction action and outputting the converted AC signal, a plurality of input-side filter means for passing a plurality of N AC signals having mutually different frequencies, An input winding connected to the side filter means and having an intermediate tap of (N-1), and a magnetic path provided in correspondence with the input winding and forming a common magnetic path with the input winding (N- 1) a transformer having an output-side winding having an intermediate tap, and a plurality of output-side filter means connected to the output-side winding and passing a plurality of AC signals having mutually different frequencies . Said input
The power-side winding and the output-side winding are each integrally wound around the magnetic core.
An electromagnetic conversion device characterized by being rotated .