JP3231867B2 - Interference wave applying device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interference wave applying apparatus for applying a pseudo interference wave to a communication device in order to measure a resistance of the communication device to a conducted interference wave entering through a communication line or a power line. Related to 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 tolerance of the communication device. For this purpose, there is a method of artificially applying an interference wave to a communication device to measure the proof stress. In addition, the target value and the test method of the proof stress of the communication equipment are recommended by the international standardization organization. To do this, for example, I
EC801-6 and the like.

In order to measure the resistance of a communication device to an interference wave, it is common to insert an interference wave applying device between a 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 drawing, reference numeral 1 denotes a device under test, 2 denotes an auxiliary device for operating the device under test 1 and testing whether the device under test 1 is operating normally, and 3 denotes an interference wave generator for generating an interference wave. It is. Reference numeral 40 denotes 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. Reference numeral 5 denotes an impedance for adjusting the impedance of the circuit.

In the application device 40, reference numeral 4 denotes a capacitor for preventing a DC voltage due to a supply voltage on the communication line from flowing into the voltage application coil 15, and reference numeral 60 denotes a common mode choke for suppressing application of an interference wave to the auxiliary device 2. 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 an interference wave from the interference wave generator 3.

Reference numeral 10 denotes a low frequency transformer connected to the input port 9, and 14 denotes the low frequency transformer 10 and E.
This is a high-frequency transformer connected between the UT port 7. The low frequency transformer 11 includes a coil 11 for applying a voltage.
a, 11b and a coil 12 for preventing resonance. A resistor 13 for preventing series resonance is connected to the coil 12 for preventing resonance. In order to bypass high frequency components, the low frequency transformer 10 has a series body of a capacitor 19a and a resistor 18a and a capacitor 19b and a resistor 1b.
8b are connected in parallel. The high-frequency transformer 14 includes coils 15a and 15b for applying voltage and a coil 16 for preventing resonance, and a resistor 17 for preventing series resonance is connected to the coil 16 for preventing resonance.

Points A and B are connection points for connecting one end of each impedance having the same value on a communication line between the device under test 1 and the auxiliary device 2. Point C is a connection point connecting the other ends of the 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 application device 40 supplies the interference wave generated by the interference wave generation device 3 to the device under test 1 via the low frequency transformer 10 and the high frequency transformer 14. I do. Here, in those transformers, the coils 11a and 11b or the coils 15a and 15b
Is to increase the inductance of a signal appearing between A and B so as to exhibit a high impedance and not to attenuate the signal. Also, with respect to the voltage from the interfering wave generator 3, the inductance is canceled each other so that only a small impedance is shown. A resistor 13 is connected to the coil 12 of the low-frequency transformer 10 to prevent resonance of the transformer. The coil 1 in the high frequency transformer 14
6, a resistor 17 is connected to prevent resonance of the transformer.

Here, the performance of the low-frequency transformer 10 deteriorates at high frequencies, and acts to block the voltage from the interference wave generator 3. Therefore, the capacitor 1 is set 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 interference wave does not leak to the auxiliary device 2.

According to such a configuration, a transformer exists in the circuit. That is, there is an inductance as a circuit element. For this reason, the inductance and the stray capacitance of the circuit resonate, and the frequency band of the interference wave does not spread.

Further, the common mode impedance of the common mode choke coil 60 is to keep the common mode impedance between the terminal 7 and the ground at a value determined by IEC, and to prevent the applied interference wave from leaking to the auxiliary device 2. Therefore, the frequency band used by the interference wave applying device is 15
It is necessary to have a sufficiently large value between 0 kHz and 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. However, the characteristics of a core having a high magnetic permeability deteriorate as the frequency increases. In addition, the frequency band is wide,
In addition, when a core having a small magnetic permeability is used, many windings are required, and resonance due to the windings occurs. Therefore, a plurality of common mode choke coils using cores having different magnetic permeability are connected in series to form a 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 application device 40. In the figure, the horizontal axis indicates frequency. As shown in the figure, IEC8 in the range from 150 kHz to 26 MHz.
Satisfies the criteria of 01-6, but 26 MHz to 80 M
There are many ranges that do not satisfy the standard in Hz.

[0012]

Since the conventional interference wave applying apparatus is configured as described above, the interference wave frequency is 2
If the frequency becomes higher than 6 MHz, the standard is not satisfied.

On the other hand, with the progress of communication technology, communication lines connected to communication equipment are not limited to a pair of balanced lines (two lines),
The number of two pairs of balanced lines (four lines, for example, ISDN bus interface) and four pairs of balanced lines are increasing. Communication devices having such multi-pair communication line terminals tend to increase in the future, and it is desired to realize an interference wave applying device for these communication devices. However, since the conventional interference wave applying device uses a large amount of inductance as a circuit element, it is necessary to realize a device for a communication device having a multi-pair communication line terminal meeting the standards recommended by the International Standards 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 interference wave applying apparatus capable of covering a frequency band of 150 kHz to 80 MHz. It is another object of the present invention to provide an interference wave applying apparatus that can cope with communication equipment connected to a multiplicity of communication lines of balanced lines.

[0015]

According to a first aspect of the present invention, there is provided an interference wave applying apparatus, wherein one end is connected to each core of a communication line, and the other end is connected to the interference wave applying apparatus. impedance equal elements equal co the respective values
Each series circuit of a capacitor, connected between each impedance and auxiliary equipment, provided with a common mode choke coil having a large loss for disturbance, the
Reduce the capacity of the capacitor to minimize insertion loss for communication signals.
And affect common mode impedance characteristics.
It is characterized by not being given.

Furthermore, impedance equal elements of each Re their Re value is composed of equal resistance each resistance value, the resistance value and the capacitor, impedance frequency between the ground side of the communication line and the interference wave generator 1 5 0kH
It is set so as to be 150 ± 20Ω from z to 26 MHz, and 150 + 60 / −45Ω from 26 MHz to 80 MHz.

[0017] Then, the interference wave application apparatus according to the second aspect of the present invention, in the interference wave application apparatus according to claim 1 Symbol placement,
A common mode choke coil has a first core comprising a rectangular closed magnetic circuit having an effective magnetic permeability of a certain value or more up to a predetermined high frequency region, and a closed magnetic circuit having an effective magnetic permeability equal to or greater than the first core in a low frequency region. And at least one of a third core having an effective magnetic permeability equal to or higher than that of the first core in the low frequency region and having a closed magnetic path, and a long side of the closed magnetic path of the first core. The first uniform winding group wound on the first portion and the vicinity of 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 used. A third winding in which the wound second winding set and the vicinity of the other end of the long side of the first core or the short side and a part of the magnetic path of the third core are commonly wound. At least one of a first winding set and a second winding set or the first winding set. The winding directions of the winding set and the third winding set are such that the core magnetic fluxes are generated in the same direction with respect to the inflow common mode current from the input terminal or the output terminal, and the first equalization is performed. At least one of the winding set, the second winding set, and the third winding set is obtained by twisting a core of a communication line.

[0018]

According to the first aspect of the present invention, each of the series circuits
The capacitance of the capacitor included in the
Low input loss and common mode impedance characteristics
It is defined not to affect gender. For this reason,
There is no need to provide a transformer in the harmful wave applying device. Tiger
Characteristic by transformer resonance
Can be avoided.

Further, a series circuit of a resistance equal equal capacitors each value of their respective resistance value is kept within the reference value has been recommended common mode impedance from international standardization organizations.

The common mode choke coil according to the second aspect of the present invention realizes good characteristics over a wide frequency band by combining a plurality of cores having different effective magnetic permeability.

[0021]

FIG. 1 shows a basic configuration of an interference wave applying apparatus according to the present invention. In the figure, 1 is a device under test,
Reference numeral 2 denotes an auxiliary device for operating the device under test 1 to test whether or not the device under test 1 is operating normally. Reference numeral 3 denotes an interfering wave generator for generating an interfering wave.
The application device 5 and the application device 5 set between the interference wave generator 3 and the interference wave generator 3 are impedances for adjusting the impedance of the circuit.

In the application device 41, reference numeral 4 denotes a capacitor for preventing a DC voltage from a supply voltage on a communication line from flowing into the voltage application coil 15, and reference numeral 6 denotes a common mode choke for suppressing application of an interference wave to the auxiliary device 2. Coil.
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 an interference wave from the interference wave generator 3. Reference numeral 20 denotes an impedance for maintaining an impedance value between a ground wire of the communication line connecting the device under test 1 and the auxiliary device 2 on the side of the device under test 1 and a value recommended by the International Organization for Standardization. is there.

Next, the operation will be described. Device under test 1
The application device 41 supplies the terminal 9 with the immunity test voltage generated by the interference wave generation device 3 when the signal is transmitted between the auxiliary device 2 and the auxiliary device 2. 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 satisfy the necessary conditions shown in FIG. In FIG. 2, the common mode impedance is a reference value recommended by the International Organization for Standardization, the insertion loss is a loss for operating the communication device normally, and the maximum input voltage is the maximum level of a voltage generated in an actual environment. The value of the circuit element is determined as follows.

First, in order for the common mode impedance of the application device 41 to satisfy the value (150Ω) shown in FIG.
For example, the output impedance of the interference wave generator 3 is 50Ω.
Then, the parallel connection value of the impedance 20 is 100Ω.
Needs to be Therefore, the impedance 20 is usually a resistor, 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
0.

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. The maximum common mode impedance when the impedance 20 and the capacitor 4 are connected in series is 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 interference wave generator 3 is set to 50Ω, the impedance in the application device 41 needs to be 120Ω or less. Therefore, the capacity of the capacitor 4 needs to satisfy the relationship of the expression (2).

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

The application device 41 needs to 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, reference numeral 21 denotes a resistor for maintaining an impedance value between a core wire of the communication line connecting the device under test 1 and the auxiliary device 2 on the side of the device under test 1 and ground to a value recommended by the International Organization for Standardization. And 100 is the characteristic impedance of the line.

From this equivalent circuit, the insertion loss is expressed by equation (3). L <20 log | 1+ {Z ₀ / [4 (R + 1 / jωC)]} | (dB) (3) In equation (3), Z ₀ is the characteristic impedance of the line. When C is infinity, L = 8d at Z ₀ = 600Ω
B, L = 2 dB at Z ₀ = 100Ω (when n = 2), and at 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, in order for the insertion loss to be 2 dB (10 kHz) or less, C is 50 nF.
A requirement is that: From the above requirements, the capacity of the capacitor 4 is appropriately 30 nF.

Hereinafter, several embodiments of the present invention will be described. FIG. 6 shows an application device 4 according to the first embodiment of the present invention.
2 shows the circuit configuration of FIG. In the figure, reference numeral 21 denotes a resistor for maintaining an impedance value between a core wire of the communication line connecting the device under test 1 and the auxiliary device 2 on the side of the device under test 1 and ground to a value recommended by the International Organization for Standardization. It 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 necessary condition.

FIG. 7 shows a circuit configuration of an application device 43 according to a 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). Further, from the relationship 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 application device 44 according to the third embodiment of the present invention. In this embodiment,
An interference wave applying device for a communication device connecting four pairs of balanced lines (n = 8) is shown. Therefore, the resistance value of each resistor 21 is 800Ω from the equation (1). Further, from the relationship 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 an application device 45 according to a 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 a high-voltage interference wave is generated from the interference wave generator 3. From the equation (1), the resistance value of the resistor 21 per one core wire is 2
00Ω. Further, from the relationship 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 50 V 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 exhibiting good performance at 150 kHz to 80 MHz. Therefore, in this embodiment,
By connecting four 800 Ω resistors in parallel with a heat capacity of 5 W, 20
W heat capacity is obtained.

FIG. 10 shows a circuit configuration of an application device 46 according to a fifth embodiment of the present invention. In the figure,
102 is a fan for cooling the resistor 21. This embodiment also shows an interference wave applying device for a communication device that connects a pair of balanced lines (n = 2). However, it is assumed that a high-voltage interference wave is generated from the interference wave generator 3. From the equation (1), the resistance value of the resistor 21 is 200Ω.
It is. Further, from the relationship 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 power that can be applied is increased by cooling the resistor 21 with an electric fan or the like.

Incidentally, it is also effective to improve the characteristics of the common mode choke coil in order to improve the performance of the interference wave applying device. 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 made of a rectangular closed magnetic path having an effective magnetic permeability substantially equal to that of the conventional core for a common mode choke coil (having a magnetic permeability of a certain value or more up to a predetermined high frequency region), 23a is a second core having a larger effective magnetic permeability than the first core 22 in the low frequency region, and 23b is a first core 2 in the low frequency region.
A third core having an effective magnetic permeability greater than 2; 24, a first winding wound on the first core 22; 25, a second winding wound on the first core 22 and the second core 23a; Winding,
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 the same effective magnetic permeability as a conventional high-frequency circular core, and has a closed magnetic path having a short axis and a long axis orthogonal to each other and symmetric with respect to the long axis. I have.
Further, the second core 23a and the third core 23b also include closed magnetic paths. The first winding 24 is a uniform winding set wound around the long side of the closed magnetic path 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. Of the first winding 26
Is a winding set in which the vicinity of the other end of the long side portion of the core 22 and the part of the magnetic path of the third core 23b are commonly wound. Note that 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 is wound in such a direction 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 first core 22, the second core 23a, and the third core 23b are changed in size and effective magnetic permeability as needed, and an arbitrary wideband characteristic is realized.

The second core 23a and the second winding 25
Or the third core 23b and the third winding 26 can be omitted. In that case, the loss is different from 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 permeability 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, the distance between the input terminal 27 and the output terminal 28 can be increased to reduce the capacitive coupling between the input and output. (3) The second core 23a and the third core 23b are arranged at both ends of the first core 22, and the windings are wound continuously thereon, so that there is no interference between the coils and the coil is flat. Characteristics are obtained. Further, the size of the common mode choke coil can be reduced.

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

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

(1) By twisting the core wires of the balanced pair, the dispersion 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 (center-of-gravity line) composed of different balanced pairs as a communication line by bundling a balanced pair of logarithms necessary for normal operation of the communication device. Test becomes possible. As shown in FIG.
When the balanced pair is individually wound, the loss of the center of gravity line is large and the communication device does not operate. Therefore, testing is not possible. Such a center of gravity line is currently used for monitoring the status of a handset by a key telephone or the like, for example, for monitoring the status of a handset.

FIG. 15 shows a basic configuration of an interference wave applying apparatus using such a common mode choke coil. 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 application device 4
7 supplies the voltage for immunity test generated by the interference wave generator 3 to the terminal 9. Then, impedance 2
A voltage is applied to the device under test 1 via 0. Due to the common mode choke coil 6, this voltage is
Is not applied to the test device 1, so that only the device under test 1 can be tested.

According to such a configuration, the characteristics of the common mode choke coil, which has conventionally caused deterioration of the characteristics of the application device, are improved over a wide band.
In a wide band of 150 kHz to 80 MHz, an application device that satisfies the standards recommended by the International Standards Organization can be realized. Further, the circuit configuration is simple, and the impedance 2
By increasing the number of zeros, it is possible to easily realize an application device that can be applied to a device having one balanced pair or three or more balanced pairs.

FIG. 16 shows a circuit configuration of an application device 48 according to the sixth embodiment of the present invention using the common mode choke coil 6 shown in FIG. In the figure, reference numeral 21 denotes a resistor for maintaining an impedance value between a core wire of the communication line connecting the device under test 1 and the auxiliary device 2 on the side of the device under test 1 and ground to a value recommended by the International Organization for Standardization. It 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 application device 48, and FIG. 18 shows the measurement result of the phase angle. As shown in each figure, the application device 42 meets the standards recommended by the International Standards Organization. FIG. 19 shows the insertion loss of the application device 48. From FIG. 19, as for the insertion loss,
It can be seen that it meets the standards recommended by the International Standards Organization.

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 drawing, it can be seen that the common mode choke coil 6 further increases the coupling attenuation from the input port 9 to the AE port 8.

FIG. 22 shows a circuit configuration of an application device 49 according to the seventh embodiment of the present invention using the common mode choke coil 6 shown in FIG. In the figure, reference numeral 21 denotes a resistor for maintaining an impedance value between a core wire of the communication line connecting the device under test 1 and the auxiliary device 2 on the side of the device under test 1 and ground to a value recommended by the International Organization for Standardization. It is. In this 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 two or more pairs of common mode choke coils may be used in addition to the pair of common mode choke coils.

FIG. 23 shows a circuit configuration of an application device 50 according to an eighth embodiment of the present invention using the common mode choke coil 6 shown in FIG. In the figure, reference numeral 21 denotes a resistor for maintaining an impedance value between a core wire of the communication line connecting the device under test 1 and the auxiliary device 2 on the side of the device under test 1 and ground to a value recommended by the International Organization for Standardization. It is. In this 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 adjusted so that the common mode impedance of the application device satisfies the value shown in FIG.
When the common mode choke coil 6 shown in FIG. 11 is used by setting the resistance value of
An application device with more excellent characteristics can be obtained. Also,
Such an application device can be applied to a communication device that connects one or more pairs of communication lines.

[0055]

As described above, according to the first aspect of the present invention, the interference wave applying device has one end connected to each core of the communication line and the other end connected to the interference wave applying device. It has a configuration in which each series circuit of the impedance having the same value and the capacitance having the same value, and a common mode choke coil which is connected between each impedance and the auxiliary device and has a large loss with respect to an interference wave. 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 interference wave applying apparatus can be easily applied even if the logarithm of the communication line increases, and can perform an immunity test of a device under test having an arbitrary number of logarithmic communication line terminals.

[0056] Further, in interfere harm wave applying apparatus, is 150 ± from the impedance frequency 1 5 0 kHz between the resistance and capacitance of equal resistance each value from the communication line and the ground side of the disturbance generator to 26 MHz 20
Ω, 150 + 60 /-from 26MHz to 80MHz
Since it is the one set so that 45Ω, 1 5 0
It is possible to provide a device capable of performing a stable interference wave application test in a wide frequency range from kHz to 80 MHz.

According to the second aspect of the present invention, the interfering wave applying device is a winding in which a plurality of cores having different effective magnetic permeability are combined and a pair of cores constituting a communication path are twisted. Since the configuration is provided with the common mode choke coil having a line, a stable interference wave application test can be performed in a wide frequency range, and a device that can be easily applied even when the logarithm of the communication line increases can be provided. In addition, various effects such as obtaining flatter characteristics and increasing the degree of balance can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a basic configuration of an interference wave applying apparatus 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 an impedance variation.

FIG. 4 is a circuit diagram showing an equivalent circuit for calculating an 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 apparatus according to the first embodiment of the present invention.

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

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

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

FIG. 10 is a configuration diagram showing a circuit configuration of an interference wave applying apparatus 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 a pair wire is twisted.

FIG. 14 is a circuit diagram for explaining a center-of-gravity line signal in a case where twisted pairs are not twisted.

FIG. 15 is a configuration diagram showing a basic configuration of an interference 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 apparatus 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 illustrating a relationship between a coupling attenuation amount and a frequency (from an input port to an EUT port).

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

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

FIG. 23 is a configuration diagram showing a circuit configuration of an interference wave applying apparatus 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 a conventional interference wave applying device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Apparatus under test 2 Auxiliary device 3 Disturbing wave generator 4 Capacitor 20 Impedance 21 Resistance 41-50 Disturbing wave applying device 6,60 Common mode choke coil

Continuation of front page (72) Inventor Kunishuo Takagi 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References JP-A-2-27849 (JP, A) JP-A-3 -222528 (JP, A) JP-A-61-263105 (JP, A) JP-A-60-66804 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B 17/00

Claims (2)

(57) [Claims] 1. 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 supplying an interference wave from an interference wave generator to the communication device. in disturbance applying device for the other end with one end to the respective cores of the n communication lines are connected is connected to the interference wave applying device, equal capacitors equal resistance element and the respective capacitance values of the respective resistance values And a common mode choke coil connected between each series circuit and the auxiliary device and having a large loss with respect to an interfering wave , wherein the resistance value (R) of the resistance element is Output of jammer
When the resistance value of the force impedance is r, R = (150−r) × n, and the capacitance C of the capacitor is C> 1 / Ｃn (2π × 150 × 10 ³ ) [(170−
r) ^2- (R / n) ² ] ^1/2 } , and the communication device
Using characteristic impedance (Z ₀ ) and signal angular frequency (ω)
The insertion loss of communication lines which are defined by the following formula have, 20log | 1+ {Z ₀ / [4 (R + 1 / jωC]} |
(DB) is set to a value that satisfies the condition of not more than 2 (dB), the insertion loss for a communication signal is reduced, and the common mode impedance characteristic is not affected. Applicator. 2. A common mode choke coil comprising: a first core comprising a rectangular closed magnetic path having an effective magnetic permeability of a certain value or more up to a predetermined high frequency region; and an effective core having a same or higher effective efficiency as the first core in a low frequency region. At least one of a second core and a third core having a magnetic permeability and made of 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 set in which a portion near one end of a long side portion of the first core or a short side portion and a part of a magnetic path of the second core are commonly wound; And at least one of a winding set in which a part of the magnetic path of the third core is commonly wound around the other end or the short side of the long side of the core. 1 winding set and the second winding set, or the winding of the first winding set and the third winding set The direction is such that the core magnetic flux is generated in the same direction with respect to the common mode current flowing from the input terminal or the output terminal, and the first winding set and the second winding set And at least one of the third winding set,
Is obtained by twisting the core wire of the communication line according to claim 1 Symbol placement of the interference wave applying device.