JPH06209300A - Interference wave impressing device - Google Patents

Abstract

PURPOSE:To obtain an interference wave impressing device which is capable of covering the frequency bands of 150kHz to 80MHz and coping with a communication equipment to be connected with communication lines having many balanced pair lines. CONSTITUTION:In each series circuit consisting of equal impedances 20 and equal capacitances 4, one end is connected with each core wire of a communication line and the other end is connected with an interference wave impressing device. The impedance value of each impedance 20 and the capacity of each capacitance 4 are set so as to satisfy a prescribed specification. A common mode choke coil 60 is connected between each impedance and an auxiliary device and large loss is imparted to interference waves.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to application of an interference wave for applying a pseudo interference wave to a communication device in order to measure a proof stress of a communication device against a conducted interference wave which enters through a communication line or a power line. Regarding the device.

[0002]

2. Description of the Related Art An interfering wave entering a communication device via a communication line or the like causes a malfunction of the communication device. Therefore, in order to realize highly reliable communication, it is necessary to clarify the proof stress of the communication device. Therefore, there is a method of artificially applying an interfering wave to a communication device to measure the proof stress. In addition, the target value of the proof strength of communication equipment and the test method are recommended by the International Standardization Organization. For example, I
EC801-6 and the like.

In order to measure the proof strength of a communication device against an interference wave, it is common to insert an interference wave applying device between the communication line terminal of the communication device and the communication line. FIG. 24 shows a circuit configuration of a conventional interference wave applying device. In the figure, 1 is a device under test, 2 is an auxiliary device for operating the device under test 1 to test whether the device under test 1 is operating normally, and 3 is a disturbance wave generating device for generating a disturbance wave. Is. Further, 40 is an interfering wave applying device (hereinafter, also referred to as an applying device) set between the device under test 1 and the interfering wave generating device 3, and 5 is an impedance for adjusting the impedance of the circuit.

In the applying device 40, 4 is a capacitor for preventing a DC voltage due to the supply voltage on the communication line from flowing into the voltage applying coil 15, and 60 is a common mode choke for suppressing the application of the interfering wave to the auxiliary device 2. It is a coil. 7 is a terminal (E) connected to the device under test (EUT) 1.
UT port), 8 is a terminal (AE port) connected to the auxiliary device (AE) 2, and 9 is a terminal (input port) for inputting the interference wave from the interference wave generation device 3.

Further, 10 is a low frequency transformer connected to the input port 9, and 14 is the low frequency transformer 10 and E.
It is a high frequency transformer connected between the UT port 7. The low frequency transformer 11 is a coil 11 for voltage application.
a and 11b and a resonance preventing coil 12, and a series resonance preventing resistor 13 is connected to the resonance preventing coil 12. Further, in the low frequency transformer 10, a series body of the capacitor 19a and the resistor 18a, the capacitor 19b and the resistor 1 are provided in order to bypass the high frequency component.
The serial body of 8b is connected in parallel. The high frequency transformer 14 includes coils 15a and 15b for voltage application and a resonance preventing coil 16, and a series resonance preventing resistor 17 is connected to the resonance preventing coil 16.

Points A and B are connection points for connecting one ends of impedances having the same value on the communication line between the device under test 1 and the auxiliary device 2, respectively. Point C is a connection point connecting the other ends of those impedances.

Next, the operation will be described. Device under test 1
When the signal is transmitted between the auxiliary device 2 and the auxiliary device 2, the applying device 40 supplies the interfering wave generated by the interfering wave generating device 3 to the device under test 1 through the low frequency transformer 10 and the high frequency transformer 14. To do. Here, in those transformers, the coils 11a and 11b or the coils 15a and 15b are used.
Causes the signals appearing between A and B to mutually enhance their inductances to exhibit a high impedance and prevent the signals from being attenuated. Further, with respect to the voltage from the interfering wave generator 3, the inductances thereof are canceled by each other so that only a small impedance is exhibited. A resistor 13 is connected to the coil 12 of the low frequency transformer 10 to prevent resonance of the transformer. In addition, the coil 1 in the high frequency transformer 14
A resistor 17 is connected to 6 to prevent resonance of the transformer.

[0008] Here, the low-frequency transformer 10 deteriorates in performance at high frequencies, and acts to block the voltage from the interfering wave generator 3. Therefore, the capacitor 1 is arranged so that the high frequency voltage bypasses the low frequency transformer 10.
9a and 19b are connected in parallel to the low frequency transformer 10. The resistors 18a and 18b are connected in series to the capacitors 19a and 19b, respectively, to prevent resonance. Further, the common mode choke coil 60 installed on the communication line acts so that the applied interfering wave does not leak to the auxiliary device 2.

According to this structure, the transformer exists in the circuit. That is, inductance exists as a circuit element. Therefore, the inductance and the stray capacitance of the circuit resonate with each other and the frequency band of the interfering wave does not spread.

Further, the common mode impedance of the common mode choke coil 60 keeps the common mode impedance between the terminal 7 and the ground at a value determined by IEC, and prevents the applied interference wave from leaking to the auxiliary device 2. Therefore, 15 is the frequency band used by the interference wave applying device.
It is necessary to have a sufficiently large value at 0 kHz to 80 MHz. In order to increase the common mode impedance, it is necessary to increase the magnetic permeability of the core used in the choke coil, but the core having a large magnetic permeability deteriorates in characteristics as the frequency increases. Also, the frequency band is wide,
Moreover, when a core having a small magnetic permeability is used, many windings are required, and resonance occurs due to the windings. Therefore, by connecting a plurality of common mode choke coils using cores having different magnetic permeability in series, the common mode choke coil 6
0 is formed. However, even in that case, the characteristics deteriorate due to the coupling between the coils.

FIG. 25 shows the absolute value of the impedance between the core wire and the ground in the conventional applying device 40. In the figure, the horizontal axis represents frequency. As shown in the figure, IEC8 is obtained in the range of 150 kHz to 26 MHz.
Satisfies the criteria of 01-6, but 26MHz-80M
At Hz, there are many ranges that do not satisfy the standard.

[0012]

Since the conventional interference wave applying device is constructed as described above, the interference wave frequency is 2
The standard is not satisfied when the frequency becomes higher than 6 MHz.

On the other hand, due to the progress of communication technology, the communication line connected to the communication device is not limited to a pair of balanced lines (2 lines).
There are many pairs of balanced lines (4 lines, for example, ISDN bus interface) and 4 pairs. The number of communication devices having such multi-pair communication line terminals tends to increase in the future, and it is desired to realize an interfering wave applying device for these communication devices. However, the conventional interfering wave applying device uses a lot of inductance as a circuit element, so if one tries to realize a device for a communication device having a multi-pair communication line terminal that meets the standard recommended by the international standardization organization. , The circuit becomes complicated.

The present invention has been made to solve such a problem, and an object of the present invention is to provide an interfering wave applying apparatus capable of covering a frequency band of 150 kHz to 80 MHz. Another object of the present invention is to provide an interfering wave applying device that can be applied to a communication device connected to a balanced pair of communication lines.

[0015]

According to a first aspect of the present invention, there is provided an interfering wave applying device having one end connected to each core wire of a communication line and the other end connected to the interfering wave applying device. Each series circuit of equal impedance and capacitance of equal value, and a common mode choke coil connected between each impedance and the auxiliary device and having a large loss with respect to an interference wave are provided.

According to a second aspect of the present invention, there is provided an interfering wave applying apparatus according to the first aspect, wherein impedances having the same value are resistors having the same resistance value. The capacitance is 15 when the impedance between the communication line and the grounding side of the interfering wave generator is 100 kHz to 26 MHz.
0 ± 20Ω, 150+ from 26MHz to 80MHz
It is set to be 60 / -45Ω.

According to a third aspect of the present invention, there is provided an interfering wave applying apparatus according to the first or second aspect, in which the common mode choke coil has an effective value of a certain value or more up to a predetermined high frequency range. A first core having a rectangular closed magnetic circuit having magnetic permeability, a second core having a closed magnetic circuit having an effective magnetic permeability equal to or higher than that of the first core in a low frequency region, and a first core also having a low frequency region. At least one of the third cores having an effective magnetic permeability equal to or higher than that of the closed magnetic path, the first uniform winding set wound around the long side portion of the closed magnetic path of the first core, The second winding group in which one end of the long side portion of the first core or the short side portion and a part of the magnetic path of the second core are commonly wound and the long side of the first core Near the other end of the ring-shaped portion or the short side portion and a part of the magnetic path of the third core At least one of a third winding group wound in common, and a first uniform winding group and a second winding group or a first uniform winding group and a third winding group. Winding direction is such that the core magnetic fluxes are generated in the same direction from the input terminal or the output terminal with respect to the inflow common mode current, and the first uniform winding set and the second winding set are wound. And at least one of the third winding set,
It is a twisted core wire of a communication line.

[0018]

In the invention described in claim 1, the interfering wave applying device does not include a transformer, so that the characteristic deterioration due to the resonance of the coil of the transformer does not occur. Further, the series circuit of the impedance having the same value and the capacitance having the same value in the disturbance wave applying device keeps the common mode impedance within a predetermined value.

Further, the series circuit of the resistors having the same resistance value and the capacitance having the same value in the invention according to the second aspect keeps the common mode impedance within the reference value recommended by the International Standardization Organization.

The common mode choke coil according to the third aspect of the present invention is a combination of a plurality of cores having different effective magnetic permeabilities and realizes a good characteristic over a wide frequency band.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the basic structure of an interfering wave applying apparatus according to the present invention. In the figure, 1 is the device under test,
2 is an auxiliary device for operating the device under test 1 to test whether the device under test 1 is operating normally, 3 is an interfering wave generator for generating an interfering wave, 41 is the device under test 1
And an interfering wave generator 3 are applied between the applying device 5 and the interfering wave generating device 3 to adjust the impedance of the circuit.

In the applying device 41, 4 is a capacitor for preventing a DC voltage due to the supply voltage on the communication line from flowing into the voltage applying coil 15, and 6 is a common mode choke for suppressing the application of the interfering wave to the auxiliary device 2. It is a coil.
Reference numeral 7 is a terminal connected to the device under test 1, 8 is a terminal connected to the auxiliary device 2), and 9 is a terminal (input port) for inputting the interference wave from the interference wave generator 3. 20 is an impedance for maintaining the impedance value between the core wire on the device under test 1 side of the communication line connecting the device under test 1 and the auxiliary device 2 and the ground at the value recommended by the International Standardization Organization. is there.

Next, the operation will be described. Device under test 1
While the signal is being transmitted between the auxiliary device 2 and the auxiliary device 2, the applying device 41 supplies the voltage for immunity test generated by the interfering wave generator 3 to the terminal 9. Then, a voltage is applied to the device under test 1 via the impedance 20. Since this voltage is not applied to the auxiliary device 2 by the common mode choke coil 6, only the device under test 1 can be tested.

The application device 41 must meet the requirements shown in FIG. In FIG. 2, the common mode impedance is the reference value recommended by the International Standardization Organization, the insertion loss is the loss for operating the communication device normally, and the maximum input voltage is the maximum level of the voltage generated in the actual environment. The value of the circuit element is determined as follows.

First, in order for the common mode impedance of the applying device 41 to satisfy the value (150Ω) shown in FIG.
For example, if the output impedance of the interfering wave generator 3 is 50Ω
Then, the parallel connection value of impedance 20 is 100Ω.
Must be Therefore, the impedance 20 is usually a resistance, and its value is obtained by the equation (1).

R = 100 × n (1) Here, R is a resistance value and n is the number of core wires. In the configuration shown in FIG. 1, since the number of core wires is 4, R = 40
It is 0.

Further, although the capacitor 4 is connected to the impedance 20, the capacitance of the capacitor 4 needs to be a value that does not affect the common mode impedance. When the impedance 20 and the capacitor 4 are connected in series, the common mode impedance becomes maximum at 150 kHz. Therefore, in order for the common mode impedance to be 170Ω or less, which is the maximum value shown in FIG. 2, if the output impedance of the interfering wave generator 3 is 50Ω, the impedance in the applying device 41 needs to be 120Ω or less. Therefore, the capacitance of the capacitor 4 needs to satisfy the relationship of the expression (2).

C> 1 / {nω [120 ² − (R / n) ² ] ^1/2 } (2) The relationship between C and the common mode impedance according to the equation (2) is shown in FIG. From FIG. 3, for example, when n = 2,
If the capacity of the capacitor 4 is 8 nF or more, the capacitor 4
Impedance fluctuation due to is less than 20Ω and common mode impedance is less than 170Ω. That is, when n = 2, it is a necessary condition that the capacitance of the capacitor 4 is 8 nF or more.

The applying device 41 must satisfy the condition of insertion loss shown in FIG. 2 in order to guarantee the normal operation of the device under test 1. The insertion loss can be calculated from the equivalent circuit shown in FIG. In the figure, 21 is a resistance for maintaining the impedance value between the core wire on the device under test 1 side of the communication line connecting the device under test 1 and the auxiliary device 2 and the ground at the value recommended by the International Standardization Organization. And 100 is the characteristic impedance of the line.

From this equivalent circuit, the insertion loss is expressed by equation (3). L <20log | 1+ {Z ₀ / [4 (R + 1 / jωC)]} | (dB) (3) In the equation (3), Z ₀ is the characteristic impedance of the line. When C is infinite, L = 8d at Z ₀ = 600Ω
When B and Z ₀ = 100Ω, L = 2 dB (when n = 2), and when 600Ω, the condition shown in FIG. 2 is not always satisfied. FIG. 5 shows the relationship between the capacitance of the capacitor 4 and the insertion loss in the case of 600Ω. As shown in the figure, C is 50 nF for the insertion loss to be 2 dB (10 kHz) or less.
The following is a necessary condition. From the above requirements, it is appropriate that the capacitance of the capacitor 4 is 30 nF.

Several embodiments of the present invention will be described below. FIG. 6 shows an application device 4 according to the first embodiment of the present invention.
2 shows a circuit configuration of No. 2. In the figure, 21 is a resistance for maintaining the impedance value between the core wire on the device under test 1 side of the communication line connecting the device under test 1 and the auxiliary device 2 and the ground at the value recommended by the International Standardization Organization. Is. In this embodiment, an interference wave applying device for a communication device connecting two pairs of balanced lines (n = 4) is shown. Therefore,
From the equation (1), the resistance value of each resistor 21 is 400Ω. The capacitance of each capacitor 4 is set to 10 nF from the relationships shown in FIGS. 3 and 5, that is, from each requirement.

FIG. 7 shows a circuit configuration of the applying device 43 according to the second embodiment of the present invention. In this embodiment,
An interference wave applying device for a communication device connecting a pair of balanced lines (n = 2) is shown. Therefore, the resistance value of each resistor 21 is 200Ω from the equation (1). From the relationships shown in FIGS. 3 and 5, it is appropriate that the capacitance of each capacitor 4 is 30 nF.

FIG. 8 shows a circuit configuration of the applying device 44 according to the third embodiment of the present invention. In this embodiment,
An interference wave applying device for communication equipment connecting four pairs of balanced lines (n = 8) is shown. Therefore, the resistance value of each resistor 21 is 800Ω from the equation (1). From the relationships shown in FIGS. 3 and 5, it is appropriate that the capacitance of each capacitor 4 is 30 nF.

FIG. 9 shows a circuit configuration of the applying device 45 according to the fourth embodiment of the present invention. Also in this embodiment,
An interference wave applying device for a communication device connecting a pair of balanced lines (n = 2) is shown. However, it is assumed that the interference wave generator 3 generates a high-voltage interference wave. From equation (1), the resistance value of the resistor 21 per core is 2
It is 00Ω. From the relationships shown in FIGS. 3 and 5, it is appropriate that the capacitance of each capacitor 4 is 30 nF. here,
In order for the resistor 21 to supply a voltage of about 50V to the device under test 1, it is necessary to have a heat capacity of about 15W. However, it is difficult to obtain a large-capacity resistor that exhibits good performance at 150 kHz to 80 MHz. Therefore, in this embodiment,
Heat resistance of 5W and each resistance of 800Ω connected in parallel 4
It has a heat capacity of W.

FIG. 10 shows a circuit configuration of the applying device 46 according to the fifth embodiment of the present invention. In the figure,
102 is a fan for cooling the resistor 21. Also in this embodiment, an interference wave applying device for a communication device connecting a pair of balanced lines (n = 2) is shown. However, it is assumed that the interference wave generator 3 generates a high-voltage interference wave. From the formula (1), the resistance value of the resistor 21 is 200Ω.
Is. From the relationships shown in FIGS. 3 and 5, it is appropriate that the capacitance of each capacitor 4 is 30 nF. Resistance 21 is 50
In order to supply a voltage of about V to the device under test 1, 15
Although it is necessary to have a heat capacity of about W, it is difficult to obtain a large capacity resistor as described above. Therefore, in this embodiment, the electric power that can be applied is increased by cooling the resistor 21 with an electric fan or the like.

In order to improve the performance of the interference wave applying device, it is also effective to improve the characteristics of the common mode choke coil. FIG. 11 is a perspective view showing an example of the configuration of the common mode choke coil according to the present invention.

In the figure, reference numeral 22 denotes a first core having a rectangular closed magnetic circuit, which has an effective magnetic permeability comparable to that of a conventional common mode choke coil core (having a magnetic permeability higher than a certain value up to a predetermined high frequency region), 23a is a second core having an effective magnetic permeability larger than that of the first core 22 in the low frequency region, and 23b is also the first core 2 in the low frequency region.
A third core having an effective magnetic permeability larger than 2, 24 is a first winding wound around the first core 22, and 25 is a second winding wound around the first core 22 and the second core 23a. Winding of the
26 is a third winding wound around the first core 22 and the third core 23b, 27 is an input terminal of the common mode choke coil, and 28 is an output terminal of the common mode choke coil.

The first core 22 has an effective magnetic permeability similar to that of a conventional high-frequency circular core, and is composed of a closed magnetic circuit having a short axis and a long axis orthogonal to each other and symmetrical with respect to the long axis. There is.
The second core 23a and the third core 23b also have closed magnetic circuits. The first winding 24 is a uniform winding set wound around the long side portion of the closed magnetic circuit of the first core 22. The second winding 25 is a winding set in which the vicinity of one end of the long side portion of the first core 22 and a part of the magnetic path of the second core 23a are commonly wound, and The winding 26 of the first
Is a winding set in which the vicinity of the other end of the long side portion of the core 22 and a part of the magnetic path of the third core 23b are commonly wound. The second winding 25 and the third winding 26 may be wound around each of the two short side portions of the first core 22.

Then, the first winding 24 and the second winding 25
The third winding 26 and the third winding 26 are wound such that core magnetic fluxes are generated in the same direction with respect to a common mode current flowing from the input terminal 27 (or flowing from the output terminal 28). . In addition, the size and effective magnetic permeability of the first core 22, the second core 23a, and the third core 23b are changed as necessary to realize an arbitrary wide band characteristic.

The second core 23a and the second winding 25
Alternatively, the third core 23b and the third winding 26 may be omitted. In that case, the loss is different with respect to the common mode current flowing from the input terminal 27 (or flowing from the output terminal 28).

As described above, the following effects can be obtained by combining cores having different effective magnetic permeabilities and using a core having a rectangular closed magnetic path. (1) In the low frequency region, a large impedance can be obtained with a small number of windings due to the effects of the second core 23a and the third core 23b. (2) By using the rectangular core, it is possible to increase the distance between the input terminal 27 and the output terminal 28 and reduce the capacitive coupling between the input and output. (3) Since the second core 23a and the third core 23b are arranged at both ends of the first core 22 and the windings are continuously wound on the second core 23a and the third core 23b, there is no interference between the coils and the coils are flat. The characteristics are obtained. In addition, the common mode choke coil can be downsized.

As an example of using such a common mode choke coil, there is a power line filter described in Japanese Patent Publication No. 3-20057. FIG. 12 shows the attenuation characteristics of such a common mode choke coil and the conventional common mode choke coil. As shown in the figure, in this common mode choke coil, the band exhibiting an attenuation of 30 dB or more is much wider than the conventional one,
It exhibits an attenuation characteristic of 30 dB or more in the band of 150 kHz to 80 MHz. This value is sufficient to prevent the interfering wave from affecting the auxiliary device 2.

Further, according to the common mode choke coil having the configuration shown in FIG. 11, the two core wires of the pair of balanced pairs forming the communication path are twisted together so that the communication device operates normally. The logarithmic bundle necessary for can be used as the winding. That is, FIG. 11 shows a common mode choke coil for balanced two wires. That is, the first winding wire 24, the second winding wire 25, and the third winding wire 26 are formed by twisting two balanced communication wires. By doing so, the following effects can be obtained.

(1) By twisting the core wires of the balanced pair, the variation of the stray capacitance between the balanced pairs is reduced and the degree of balance is increased. (2) As shown in FIG. 13, a communication device uses a transmission line (centroid line) composed of different balanced pairs as a communication line by bundling balanced pairs of logarithms required for normal operation of the communication device. It becomes possible to test. As shown in FIG.
When the balanced pair is wound individually, the loss of the center of gravity line is large and the communication device does not operate. Therefore, the test is impossible. It should be noted that such a center of gravity line is currently used in a key telephone or the like to monitor the status of a handset, for example, to monitor the status of a handset.

The basic structure of an interfering wave applying device using such a common mode choke coil is as shown in FIG. In FIG. 15, the common mode choke coil 6 has the structure shown in FIG.

In such a configuration, when the device under test 1 and the auxiliary device 2 are transmitting signals, the applying device 4
7 supplies the voltage for immunity test generated by the interfering wave generator 3 to the terminal 9. Then impedance 2
A voltage is applied to the device under test 1 via 0. This voltage is supplied to the auxiliary device 2 by the common mode choke coil 6.
Therefore, only the device under test 1 can be tested.

According to such a configuration, the characteristic of the common mode choke coil, which has conventionally been the cause of the characteristic deterioration of the applying device, is improved over a wide band.
In a wide band of 150 kHz to 80 MHz, it is possible to realize an application device that satisfies the standards recommended by the international standardization organization. Moreover, the circuit configuration is simple, and the impedance 2
By increasing 0, it is possible to easily realize an applying device that can be applied to balanced one pair or balanced three pairs or more.

FIG. 16 shows a circuit configuration of an applying device 48 according to a sixth embodiment of the present invention using the common mode choke coil 6 shown in FIG. In the figure, 21 is a resistance for maintaining the impedance value between the core wire on the device under test 1 side of the communication line connecting the device under test 1 and the auxiliary device 2 and the ground at the value recommended by the International Standardization Organization. Is. In this embodiment, an interference wave applying device for a communication device connecting two pairs of balanced lines (n = 4) is shown.

FIG. 17 shows the measurement result of the absolute value of the common mode impedance of the applying device 48, and FIG. 18 shows the measurement result of the phase angle. As shown in each drawing, the applying device 42 satisfies the standard recommended by the International Standardization Organization. Further, FIG. 19 shows the insertion loss of the applying device 48. From FIG. 19, the insertion loss is also
It can be seen that the standards recommended by the International Standards Organization are met.

FIG. 20 shows input port 9 to EUT port 7
FIG. 21 shows the amount of coupling attenuation from the input port 9 to the AE port 8. As shown in the figure, it is understood that the common mode choke coil 6 increases the amount of coupling attenuation from the input port 9 to the AE port 8.

FIG. 22 shows a circuit configuration of an application device 49 using the common mode choke coil 6 shown in FIG. 11 according to the seventh embodiment of the present invention. In the figure, 21 is a resistance for maintaining the impedance value between the core wire on the device under test 1 side of the communication line connecting the device under test 1 and the auxiliary device 2 and the ground at the value recommended by the International Standardization Organization. Is. In the present embodiment, an interference wave applying device for a communication device connecting a pair of balanced lines (n = 2) is shown.

As the common mode choke coil 6, one pair of common mode choke coils for two or more pairs may be used other than one pair of common mode choke coils.

FIG. 23 shows a circuit configuration of an applying device 50 using the common mode choke coil 6 shown in FIG. 11 according to the eighth embodiment of the present invention. In the figure, 21 is a resistance for maintaining the impedance value between the core wire on the device under test 1 side of the communication line connecting the device under test 1 and the auxiliary device 2 and the ground at the value recommended by the International Standardization Organization. Is. In the present embodiment, an interference wave applying device for a communication device connecting four pairs of balanced lines (n = 8) is shown.

As described above, the resistance 21 is set so that the common mode impedance of the applying device satisfies the value shown in FIG.
If the common mode choke coil 6 shown in FIG. 11 is used by setting the resistance value of and the capacitance of the capacitor 4,
It is possible to obtain an applying device having more excellent characteristics. Also,
Such an applying device can be applied to a communication device that connects one or more pairs of communication lines of arbitrary logarithms.

[0055]

As described above, according to the first aspect of the invention, the interfering wave applying device has one end connected to each core wire of the communication line and the other end connected to the interfering wave applying device. Each series circuit of impedances having the same value and capacitances having the same value, and a common mode choke coil connected between each impedance and the auxiliary device and having a large loss with respect to an interfering wave are provided. Therefore, it is possible to provide a device capable of performing a stable interference wave application test in a wide frequency range. Further, such an interfering wave applying apparatus can be easily applied even if the number of pairs of communication lines increases, and an immunity test can be performed on a device under test having terminals of arbitrary pairs of communication lines.

According to the second aspect of the invention, in the interfering wave applying device, the resistance value and the capacitance of the resistors having the same value are such that the impedance between the communication line and the ground side of the interfering wave generating device has a frequency of 100 kHz. From 2
150 ± 20Ω up to 6MHz, 80MHz from 26MHz
Since it is set to be 150 + 60 / −45Ω up to Hz, it is possible to provide the one capable of performing a stable interference wave application test in a wide frequency range from 100 kHz to 80 MHz.

According to the third aspect of the invention, in the interfering wave applying device, a plurality of cores having different effective magnetic permeability are combined, and a pair of core wires forming a communication path are twisted together. Since the configuration is provided with the common mode choke coil having a wire, it is possible to perform a stable interference wave application test in a wide frequency range, and to provide one that can be easily applied even if the number of pairs of communication wires increases. In addition, various effects such as flatter characteristics and increased balance can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a basic configuration of an interference wave applying device according to the present invention.

FIG. 2 is an explanatory diagram showing requirements for an interference wave applying device.

FIG. 3 is a relationship diagram showing a relationship between a capacitance of a capacitor and impedance fluctuation.

FIG. 4 is a circuit diagram showing an equivalent circuit for calculating insertion loss.

FIG. 5 is a relationship diagram showing the relationship between the capacitance of a capacitor and insertion loss.

FIG. 6 is a configuration diagram showing a circuit configuration of an interference wave applying device according to a first example of the present invention.

FIG. 7 is a configuration diagram showing a circuit configuration of an interference wave applying device according to a second embodiment of the present invention.

FIG. 8 is a configuration diagram showing a circuit configuration of an interference wave applying device according to a third embodiment of the present invention.

FIG. 9 is a configuration diagram showing a circuit configuration of an interference wave applying device according to a fourth example of the present invention.

FIG. 10 is a configuration diagram showing a circuit configuration of an interference wave applying device according to a fifth embodiment of the present invention.

FIG. 11 is a perspective view showing a configuration of a common mode choke coil according to the present invention.

FIG. 12 is a characteristic diagram showing characteristics of a choke coil.

FIG. 13 is a circuit diagram for explaining a center-of-gravity line signal when twisted pair wires.

FIG. 14 is a circuit diagram for explaining a center-of-gravity line signal when paired wires are not twisted.

FIG. 15 is a configuration diagram showing a basic configuration of an interfering wave applying device using a common mode choke coil according to the present invention.

FIG. 16 is a configuration diagram showing a circuit configuration of an interference wave applying device according to a sixth embodiment of the present invention.

FIG. 17 is a relationship diagram showing a relationship between common mode impedance (absolute value) and frequency.

FIG. 18 is a relationship diagram showing a relationship between common mode impedance (phase) and frequency.

FIG. 19 is a relationship diagram showing a relationship between insertion loss and frequency.

FIG. 20 is a relationship diagram showing the relationship between the coupling attenuation amount and the frequency (from the input port to the EUT port).

FIG. 21 is a relationship diagram showing the relationship between the coupling attenuation amount and the frequency (from the input port to the AE port).

FIG. 22 is a configuration diagram showing a circuit configuration of an interference wave applying device according to a seventh embodiment of the present invention.

FIG. 23 is a configuration diagram showing a circuit configuration of an interference wave applying device according to an eighth embodiment of the present invention.

FIG. 24 is a configuration diagram showing a circuit configuration of a conventional interference wave applying device.

FIG. 25 is a relationship diagram showing a relationship between common mode impedance and frequency in the conventional interference wave applying device.

[Explanation of Codes] 1 Device under test 2 Auxiliary device 3 Interfering wave generator 4 Capacitor 20 Impedance 21 Resistance 41 to 50 Interfering wave applying device 6,60 Common mode choke coil

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kunio Takagi 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation

Claims (3)

[Claims] 1. An interfering wave from an interfering wave generator is connected to a communication line terminal of a communication device and an auxiliary device connected to the communication line terminal for checking the operation of the communication device, and the interfering wave is supplied to the communication device. In the disturbance wave applying device, one end is connected to each core wire of the communication line and the other end is connected to the disturbance wave applying device, and each series circuit of an impedance having an equal value and a capacitance having an equal value, respectively. An interference wave applying device comprising: a common mode choke coil connected between each of the impedances and the auxiliary device and having a large loss with respect to the interference wave. 2. The impedances having the same value are composed of resistors having the same resistance value, and the resistance value and the capacitance have an impedance between the communication line and the ground side of the interfering wave generator from 100 kHz to 26 kHz.
150 ± 20Ω up to MHz, 26MHz to 80MH
The interfering wave applying apparatus according to claim 1, which is set to be 150 + 60 / -45Ω up to z. 3. The common mode choke coil has a first core having a rectangular closed magnetic circuit having an effective magnetic permeability of a certain value or more up to a predetermined high frequency region, and an effective equal to or more than that of the first core in a low frequency region. At least one of a second core and a third core having a magnetic permeability and a closed magnetic path; and a first uniform winding set wound around a long side portion of the closed magnetic path of the first core, A second winding group in which the vicinity of one end of the long side portion of the first core or a short side portion and a part of the magnetic path of the second core are commonly wound; At least one of a winding set in which a part of the magnetic path of the third core is commonly wound and a portion near the other end of the long side of the core or a short side of the third core, One equalization set and the second winding set, or the first equalization set and the third winding set The line direction is such that the core magnetic fluxes are generated in the same direction with respect to the common mode current flowing from the input terminal or the output terminal, and the first uniform winding set and the second winding set. Set and the third
3. The interfering wave applying apparatus according to claim 1, wherein at least one of the winding set of the above is a twisted core wire of a communication wire.