WO2007063627A1

WO2007063627A1 - Signal coupling device

Info

Publication number: WO2007063627A1
Application number: PCT/JP2006/315579
Authority: WO
Inventors: Yuichiro Murata; Junichi Abe; Takao Tsurimoto
Original assignee: Mitsubishi Electric Corporation
Priority date: 2005-11-29
Filing date: 2006-08-07
Publication date: 2007-06-07
Also published as: JPWO2007063627A1

Abstract

In a capacitive coupler (CCU) 100 used in a power line communication system that performs communication by putting a high-frequency signal on a power line (8), increasing the capacitance of a high-voltage capacitor (1) in order to increase the coupling efficiency in the low-frequency region of the high-frequency signal has been problematic, for example, in that the cost of the capacitor is increased and the breakdown voltage is lowered. In a signal coupling device of this invention, a drain coil (2) used in the CCU (100) is wound around a magnetic core (21) to match a frequency in the characteristic region in which the Q value of the complex permeability of a magnetic material constituting the magnetic core (21) increases with a frequency in the low-frequency region of the high-frequency signal. This enables the coupling efficiency in the low-frequency region of the high-frequency signal to increase, so that a high coupling efficiency is obtained in a wider frequency range.

Description

Specification

Signal coupling device

Technical field

The present invention relates to a signal coupling device used in a power line carrier communication system that transmits and receives a high frequency signal using a power line as a carrier path.

Background art

[0002] A power line communication (PLC) system performs high-frequency signal communication such as data communication by superimposing transmission signals of 2 [MHZ] to 40 [MHZ] on a power line. is there. In the PLC system, a signal coupling device that injects and extracts a transmission signal from a power line is usually composed of a capacitive coupling unit (hereinafter referred to as CCU) using a high voltage capacitor. .

[0003] A signal coupling device composed of this CCU includes a high voltage capacitor having one end connected to a first terminal connected to a power line, and one end connected to the other end of the capacitor and the other end connected to a ground terminal. A high-frequency communication signal that is cut from the high voltage force of the power line is extracted or injected from the second terminal connected to the connection between the high voltage capacitor and the drain coil. is there. (For example, see Patent Document 1)

Patent Document 1: US2001 / 0038329A1 (See Fig.l, [0050]-[0051])

Disclosure of the invention

Problems to be solved by the invention

[0004] In the signal coupling device configured as described above, the high-frequency signal voltage VI flowing through the power line is divided by the high voltage capacitor and the drain coil and is taken out as the voltage V2 from the second terminal cover. It is. V2ZV1, which is the ratio of VI to V2, is called coupling efficiency, and is used as one of the characteristics of high-frequency signal injection and extraction for power lines using CCU. To increase this coupling efficiency, it is necessary to increase the capacity of the high voltage capacitor and the inductance of the drain coil.

[0005] However, when the capacity of the high voltage capacitor is increased, there is a problem in that the withstand voltage performance deteriorates as the cost of the capacitor increases. Also, the drain coil inductance Increasing the frequency of the coil increases the cost of the coil, and the stray capacitance of the coil degrades the high frequency characteristics. Even if the frequency of the high frequency signal is 2 [MHZ], the coupling efficiency can be increased. There was a problem that the coupling efficiency in the vicinity of 30 [MHZ] was lowered.

[0006] The present invention has been made to solve the above-described problems, and provides a signal coupling device capable of obtaining high coupling efficiency without increasing the capacitance of the high voltage capacitor and the inductance of the drain coil. It is intended to do.

Means for solving the problem

[0007] A signal coupling device according to the present invention includes a first terminal connected to a power line, a capacitor connected to the first terminal, an inductor connected in series to the capacitor, the capacitor, and the And a second terminal connected to a communication device that transmits and receives the high-frequency signal. The inductor is configured by winding a coil around a magnetic material, and the magnetic material is a complex thereof. The frequency region in which the Q value of the permeability increases is configured to coincide at least partially with the lower limit region of the frequency band of the high-frequency signal.

In the present invention, the Q value of the complex permeability means a real part Z imaginary part which is a ratio of a real part and an imaginary part of the complex permeability.

[0009] In addition, the signal coupling device according to the present invention is configured such that a series resonance frequency of the capacitor and the inductor exists in a frequency region in which a Q value of the complex permeability of the magnetic material increases.

[0010] Further, the signal coupling device according to the present invention is configured such that the Q value of the complex permeability of the magnetic body at a series resonance frequency by the capacitor and the inductor is 2 or more.

[0011] Further, the signal coupling device according to the present invention is a signal coupling device used in a power line carrier communication device that transmits and receives a high-frequency signal using a power line as a carrier path, the first terminal connected to the power line, and A first capacitor having one end connected to the first terminal, an inductor connected in series to the first capacitor, a second capacitor and a matching transformer connected in parallel to the inductor, and a matching transformer, A second terminal for connecting a communication device connected to the output side for transmitting and receiving the high-frequency signal. The ductor and the matching transformer are configured by winding a coil around a magnetic material, and the magnetic material is

The frequency region in which the Q value of the complex permeability increases is configured to at least partially match the lower limit region of the frequency band of the high-frequency signal.

[0012] Further, in the signal coupling device according to the present invention, the resonance frequency determined by the inductance of the inductor, the self-inductance of the winding on the power line side of the matching transformer, and the capacitance of the first capacitor is It is constructed so that it exists in the frequency region where the Q value of the complex permeability of the magnetic material increases.

[0013] In the signal coupling device according to the present invention, the magnetic body constituting the inductor is configured to be magnetically saturated when a current of a predetermined value or more flows through the inductor. In the present invention, the predetermined value means a value that can damage the signal coupling device or the communication device connected to the signal coupling device.

The invention's effect

[0014] According to the signal coupling device of the present invention, the first terminal connected to the power line, the capacitor connected to the first terminal, the inductor connected in series to the capacitor, and the capacitor And a ^second terminal connected to a communication device for transmitting and receiving the high-frequency signal. The inductor is configured by winding a coil around a magnetic body, and the magnetic body is Since the frequency region where the Q value of the complex permeability increases is configured to coincide with the lower limit region of the frequency band of the high frequency signal at least partially, it is necessary to utilize the magnetic characteristics of the magnetic material. By increasing the low-band coupling efficiency in a certain frequency band, a high coupling efficiency can be obtained over a wide frequency range. In addition, since a high coupling efficiency can be obtained even if the capacity of the high voltage capacitor is reduced, a signal coupling device having excellent insulation resistance can be obtained at low cost. In addition, even if the operating temperature rises, there is an unprecedented remarkable effect that the coupling efficiency hardly decreases.

[0015] Further, according to the signal coupling device according to the present invention, the series resonance frequency by the capacitor and the inductor is configured to exist in a frequency region where the Q value of the complex permeability of the magnetic body increases. The frequency region where the coupling efficiency of the signal coupling device decreases and the frequency region where the Q value of the magnetic material increases can be matched. For this reason, coupling efficiency in the low frequency range Thus, a signal coupling device with high coupling efficiency and excellent temperature characteristics can be obtained in a wide frequency range.

[0016] In addition, according to the signal coupling device of the present invention, the Q value of the complex permeability of the magnetic body at the series resonance frequency of the capacitor and the inductor is 2 or more. Thus, it is possible to obtain a characteristic in which the coupling efficiency has a maximum value, and it is possible to obtain a signal coupling device having a high coupling efficiency and excellent temperature characteristics in a wide frequency range.

[0017] According to the signal coupling device of the present invention, the first terminal connected to the power line, the first capacitor having one end connected to the first terminal, and the first capacitor A second terminal for connecting an inductor connected in series, a second capacitor and a matching transformer connected in parallel to the inductor, and a communication device connected to the output side of the matching transformer for transmitting and receiving the high-frequency signal The inductor and the matching transformer are configured by winding a coil around a magnetic body, and the magnetic body has a frequency region in which a Q value of its complex permeability increases as a lower limit region of a frequency band of the high-frequency signal. Even if the characteristic impedance of the power line does not match the characteristic impedance of the communication modem, it is configured to match at least partially. High at the frequency range have! A signal coupling device having coupling efficiency can be obtained.

[0018] Further, according to the signal coupling device according to the present invention, the resonance frequency determined by the inductance of the inductor, the self-inductance of the winding wire on the power line side of the matching transformer, and the capacitance of the first capacitor is Since the Q value of the complex magnetic permeability of the magnetic material is present in the frequency range where it increases, the characteristic impedance of the power line force Even if it does not match the characteristic impedance of the communication modem, it can be used in a wide frequency range. A signal coupling device having high coupling efficiency can be obtained.

[0019] According to the signal coupling device of the present invention, the magnetic body constituting the inductor is configured to be magnetically saturated when a current of a predetermined value or more flows through the inductor. Since the coupling efficiency when an excessive current exceeding the value flows can be reduced, the accident voltage or surge voltage signal coupling device or this signal coupling device can be connected by appropriately setting the predetermined value. It is possible to protect the communication modem. Brief Description of Drawings

FIG. 1 is a configuration diagram showing a configuration of a signal coupling device according to Embodiment 1 of the present invention.

FIG. 2 is a characteristic diagram showing characteristics of the magnetic body according to the first embodiment of the present invention.

FIG. 3 is a characteristic diagram showing coupling efficiency according to the first embodiment of the present invention.

FIG. 4 is a characteristic diagram showing temperature characteristics of the capacity of a high voltage capacitor.

FIG. 5 is a characteristic diagram showing temperature characteristics of coupling efficiency according to the first embodiment of the present invention.

FIG. 6 is a characteristic diagram showing the relationship between the magnetic material and the coupling efficiency according to the first embodiment of the present invention.

FIG. 7 is a configuration diagram showing a configuration of a signal coupling device according to a second embodiment of the present invention.

Explanation of symbols

[0021] 1 High voltage capacitor

2 Drain coinore

21, 51 Magnetic core

3 Capacitor

4, 6 Protection element

5 Matching transformer

6 Protection element

7 Connector

8 Power line

100 CCU

BEST MODE FOR CARRYING OUT THE INVENTION

[0022] Embodiment 1

FIG. 1 is a diagram showing a circuit configuration of a signal coupling device according to Embodiment 1 of the present invention. In FIG. 1, a signal coupling device 100 constituted by a CCU includes a high voltage capacitor 1 as a first capacitor having one end connected to a first terminal 101 connected to a power line 8, and the high voltage capacitor And a drain coil 2 connected to a ground terminal 103 having one end connected to the other end of 1 and the other end grounded to the ground. The drain coil 2 is wound around a magnetic core 21 made of an annular magnetic material. The drain coil 2 and the magnetic core 21 Is configured.

The drain coil 2 is connected in parallel with a second capacitor 3, a protective element 4 having a surge arrester and the like, and a primary coil 501 of the matching transformer 5. The primary coil 501 and the secondary coil 502 of the matching transformer 5 are wound around a magnetic core 51 made of an annular magnetic body. A protective element 6 having a surge arrester and the like is connected to the secondary coil 502 of the matching transformer 5 in parallel.

A connector 7 as a second terminal is connected to the secondary coil 502 of the matching transformer 5. A cable (not shown) is connected to the connector 7 and is connected to a communication modem (not shown).

[0025] In the signal coupling device configured as described above! Assuming that the voltage of the high-frequency signal flowing through the power line 8 (hereinafter referred to as the high-frequency signal voltage) is VI, this high-frequency signal voltage VI is divided by the high voltage capacitor 1 and the drain coil 2 and taken out as voltage V2. . Now, assuming that the capacitance of the high voltage capacitor 1 is C and the inductance of the drain coil 2 is L, the coupling efficiency G (= V2ZV1) is obtained by the following equation (1).

[0026] [Equation 1]

G (Formula 1)

In Equation (1), in the region where the frequency of the high-frequency signal is low (hereinafter simply referred to as the low-frequency region), 1 >> co ² LC, so G = co ² LC. Therefore, in order to increase the coupling efficiency G in this low frequency region, it is only necessary to increase one of the inductance capacitances C! /.

[0028] When the cost of the high-voltage capacitor 1 is reduced or the capacitance C is reduced to increase the withstand voltage, the coupling efficiency G in the low-frequency region of the high-frequency signal is reduced as described in Equation (1). Decreases. Therefore, if the inductance L is increased in order to prevent a decrease in the coupling efficiency G, the stray capacitance of the drain coil 2 increases, and the coupling efficiency in a region where the frequency of the high frequency signal is high (hereinafter simply referred to as the high frequency region). G decreases. For this reason, the mere inductance L component of the drain coil 2 is increased! Just drain the coil 2 into the magnetic core 21 By using the characteristics of the magnetic core 21 as a magnetic material, the coupling efficiency G in the low frequency region of the high frequency signal is increased.

FIG. 2 shows the characteristics of the magnetic material of the magnetic core 21 that winds the drain coil 2 and the magnetic core 51 that winds the primary coil 501 and the secondary coil 502 of the matching transformer 5. As is clear from Fig. 2, the real part R of the complex permeability of the magnetic material shows a substantially constant value in the low frequency region, and decreases when it becomes higher than a certain frequency. The imaginary part I of the complex permeability shows a maximum at a specific frequency. The Q value, which is the ratio of the real part to the imaginary part of the complex permeability (real part RZ imaginary part I), is high and almost constant in the low frequency region, but then decreases rapidly as the frequency increases. In the high frequency region, the value is almost constant at a low value.

[0030] The frequency range where the real part R of the complex permeability shows a constant value and the Q value shows a high value is defined as a characteristic area A. In addition, the frequency range where the real part R decreases and the value force with a high Q value also decreases rapidly is defined as the characteristic region B. The real part R and imaginary part I of the complex permeability are reduced and the Q value is low! The frequency range where the value is constant is the characteristic region C. The Q value in the characteristic region B increases rapidly in the low value Q value force in the characteristic region C.

FIG. 3 shows the coupling efficiency of the CCU when the characteristics of the magnetic bodies constituting the magnetic cores 21 and 51 used in the drain coil 2 and the matching transformer 5 are changed. (A) in Fig. 3 shows the case of the drain coil 2 and the matching transformer 5 using the magnetic core in which the characteristic of the magnetic material is the characteristic region C in the entire frequency band D of the high-frequency signal. Coupling efficiency G shows an almost constant value in the high frequency range, but gradually attenuates with decreasing frequency.

On the other hand, (b) of FIG. 3 shows the drain coil 2 and the matching transformer 5 using the magnetic core in which the magnetic characteristic of the magnetic material is the characteristic region B in the lower limit region of the frequency band D of the high-frequency signal. In this case, the CCU coupling efficiency G increases as the frequency decreases in the low frequency region, and exhibits a maximum value at a specific frequency as described later. Thus, by matching the lower limit region of the frequency band D of the high-frequency signal with the characteristic region B in which the Q value of the magnetic substance decreases rapidly, that is, increases rapidly, coupling of the high-frequency signal in the low-frequency region is achieved. Highly efficient CCU can be obtained.

[0033] In the first embodiment, the magnetic cores 21 and 51 of the drain coil 2 and the matching transformer 5 are configured. The magnetic material is configured such that the characteristic region B where the Q value of the complex permeability increases coincides with the lower limit region of the frequency band of the high-frequency signal. With this configuration, as described above, a CCU with high coupling efficiency G can be obtained in the low frequency region of a high frequency signal.

[0034] Next, the temperature dependence characteristics of the coupling efficiency G of the CCU in the first embodiment will be described.

Generally, as the temperature rises, the capacitance C of the high voltage capacitor 1 and the inductance L of the drain coil 2 decrease. For this reason, the coupling efficiency G of the CCU decreases with increasing temperature. In addition, as shown in FIG. 4, the temperature characteristic of the capacity of the high voltage capacitor 1 is a characteristic C1 in which the capacity decreases as the temperature rises when measured at a frequency of 100 [KHZ] or less. Therefore, the coupling efficiency of CCU at low temperature below 0 degree is expected to increase. However, as a result of measuring the capacitance at a frequency of 1 [M HZ] or higher, the characteristic C2 is obtained, and the capacitance at a low temperature is also reduced. It turned out to be.

FIG. 5 (a) shows the CCU coupling efficiency when the entire frequency band D of the high-frequency signal is defined as the characteristic region C of the magnetic material of the magnetic cores 21 and 51 of the drain coil 2 and the matching transformer 5. In this case, the coupling efficiency G shows the maximum coupling efficiency at room temperature, and the coupling efficiency decreases even if the temperature increases or decreases. In other words, even if the coupling efficiency spec S is satisfied at a temperature of 25 degrees, the specifications are not met at a temperature of 50 degrees, a temperature of 80 degrees, or a temperature of 25 degrees.

FIG. 5B shows the case of Embodiment 1, that is, the lower limit region of the frequency band D of the high-frequency signal is the characteristic region B of the magnetic material of the magnetic cores 21 and 51 of the drain coil 2 and the matching transformer 5. The region other than the lower limit region is designated as the characteristic region C. In this case, the maximum value of the coupling efficiency in the low-frequency region of the high-frequency signal disappears as the temperature rises, as seen from the characteristics of the coupling efficiency at a temperature of 80 ° C and a temperature of 1.25 ° C. Even at a temperature of 80 ° C or a temperature of 1.25 ° C, it is possible to meet the coupling efficiency spec S in the low frequency range.

Next, magnetic materials constituting the magnetic core 21 of the drain coil 2 and the magnetic core 51 of the matching transformer 5 will be described. Generally, a ferrite material, an amorphous magnetic material, or the like is used as a magnetic material used for a high frequency signal of 2 to 40 [MHZ]. Figure 6 shows three types The coupling efficiency is shown when a magnetic material prototyped using the same kind of flight material is used as the drain core 2 of the CCU and the magnetic cores 21 and 51 of the matching transformer 5. As is clear from Fig. 6, in the MnZn ferrite, the Q value characteristic and the coupling efficiency characteristic of the complex permeability are indicated by F, and the Q value force of 2 to 40 [MHZ] is less than 1, so the coupling efficiency is It is about 4 [dB]

[0038] In NiZn ferrite A, the Q value and coupling efficiency characteristics of the complex permeability are indicated by FA. Since the Q value in 2 to 40 [MHZ] is 1 or more, the frequency is 10 [MHZ] or more. The coupling efficiency is 3 [dB], and the coupling efficiency is low at frequencies below 10 [MHZ]. In NiZn Ferrite B, the complex permeability Q value characteristic and coupling efficiency characteristic are indicated by FB, and the Q value at a frequency of 10 [MHZ] or less is as large as 2 or more, so the coupling efficiency in the low band is low. It increases and shows a maximum value at about 5 [MHZ]. At this time, the resonant frequency of the high voltage capacitor 1 and the drain coil 2 is 5 [MHZ]. Therefore, it is preferable to use the above-mentioned ferrite B as the magnetic material constituting the magnetic core 21 of the drain coil 2 and the magnetic core 51 of the matching transformer 5! /.

In the first embodiment, as shown in FIG. 1, the CCU circuit configuration includes a second capacitor 3, protective elements 4 and 6, and a matching transformer 5. The second capacitor 3 is for improving the high frequency characteristics, and the protection elements 4 and 6 are for absorbing the surge voltage from the distribution system. The matching transformer 5 is for impedance matching when the characteristic impedance of the power line 8 and the characteristic impedance of the communication modem connected to the connector 7 are different.

[0040] Since the characteristic impedance of power line 8 is 50 to 400 [Ω] and the characteristic impedance of communication modems is generally 50 [Ω], the primary coil (power line side) and secondary coil of matching transformer 5 ( The ratio of power to the communication modem side is 2: 1 or 3: 1. Now, assuming that the inductances of the drain coil 2 and the primary coil (on the power line side) of the matching coil 5 as parallel circuits are Ll and L2, the resonance frequency fr is expressed by the following equation (2).

[0041] [Equation 2] fr = ~~ Tf (Formula ² )

Ten

[0042] Therefore, in the first embodiment, the resonance frequency fr represented by the equation (1) is set to be the characteristic region B of the magnetic body constituting the magnetic cores 21 and 51 of the drain coil 2 and the matching transformer 5. Thus, the maximum value of the coupling efficiency G shown in (b) of FIG. 3 can be set in the lower limit region of the high-frequency signal where the coupling efficiency G of the CCU decreases.

[0043] When the signal coupling device shown in the first embodiment is connected to the power line 8, the value of the current at the power frequency of 60 [HZ] or 50 [HZ] flowing through the drain coil 2 is small in the normal state. . However, if a surge voltage is applied to the power line 8 or a short-circuit accident occurs, an excessively large current is temporarily applied to the signal coupling device. At this time, an excessive current also flows through the drain coil 2.

[0044] Therefore, in the first embodiment, when an excessive current flows through the drain coil 2 of the inductor and the primary coil 501 of the matching transformer 5, the magnetic cores 21 and 51 are magnetically saturated. The cross-sectional area and magnetic path length are set. As a result, the coupling efficiency when an excessive current flows can be reduced.

[0045] That is, in an air-core drain coil or a matching transformer, the coupling efficiency does not decrease even when an excessive current exceeding a predetermined value flows, so that the input portion of the communication modem connected to the connector 7 may be destroyed. On the other hand, according to the first embodiment, the coupling efficiency of the CCU is reduced when an excessive current exceeding a predetermined value flows, so that the communication modem can be protected. The first embodiment is particularly effective when a pulse voltage such as a surge voltage is generated and the frequency band of the excessive current and the frequency band of the high-frequency signal are equal. The predetermined value means a value that can damage the signal coupling device or a communication device such as a communication modem connected to the signal coupling device.

In the first embodiment described above, the force inductor and the matching transformer 5 described in the case where the coil is wound around the magnetic cores 21 and 51 having an annular magnetic force as the inductor and the matching transformer 5. As both magnetic cores, or as one of them, cores in the shape of toroidal core, EI core, drum core, glasses core, etc. It can also be a rod-shaped magnetic core.

Embodiment 2

FIG. 7 shows a circuit configuration of a signal coupling device according to Embodiment 2 of the present invention. In FIG. 7, the CCU 100 has a first terminal 101 connected to the power line 8, a high voltage capacitor 1 having one end connected to the first terminal, and one end connected to the other end of the high voltage capacitor 1. A drain coil 2 having the other end connected to the ground terminal 103 and a connector 7 as a second terminal connected to the drain coil 2 are provided.

The drain coil 2 is wound around a magnetic core 21 made of a magnetic material, and the drain coil 2 and the magnetic core 21 constitute an inductor. As shown in FIG. 3, the characteristic region B of the magnetic material constituting the magnetic core 21 of the drain coil 2 is made to coincide with the frequency band D of the high-frequency signal as shown in FIG. A cable is connected to the connector 7 and is connected to a communication modem (not shown).

Thus, Embodiment 2 does not include a matching transformer, a protection element, and a second capacitor as in Embodiment 1, and the voltage of power line 8 is relatively low. It is preferable to use it when a protective element is not required.

[0049] According to the second embodiment, a CCU having a high coupling efficiency G can be obtained at low cost without using a protection element or a matching circuit and in a low frequency region of a high frequency signal.

[0050] The coupling efficiency G of the CCU shows a substantially constant value in the high frequency region of the high frequency signal and decreases as the frequency decreases, but the coupling efficiency G in the low frequency region, which is the lower limit region of the high frequency signal, is as described above. Is given by G = co ² LC. On the other hand, the series resonance frequency fr of the drain coil 2 and the high voltage capacitor 1 connected in series is expressed by the following (Equation 3).

[0051] [Equation 3] (Equation 3)

[0052] This series resonance frequency fr is the lower limit region of the usable frequency band of the CCU.

In the second embodiment, the series resonance frequency fr of the high voltage capacitor 1 and the inductor constituted by the drain coil 2 is present in the characteristic region B of the magnetic core 21. According to the second embodiment, the lower limit of the frequency band of the high-frequency signal where the coupling efficiency G of the CCU decreases. The maximum value of coupling efficiency G shown in Fig. 3 (b) can be set in the region.

[0054] In the second embodiment, as in the first embodiment, when an excessive current exceeding a predetermined value flows in the drain coil 2 of the inductor, the respective magnetic cores 21 are magnetically saturated. The cross-sectional area and magnetic path length of the magnetic core are set. This can reduce the coupling efficiency of the CCU.

[0055] That is, according to the second embodiment, as in the first embodiment, the coupling efficiency of the CCU is reduced when an excessive current of a predetermined value or more flows, so that the communication modem can be protected. . The second embodiment is particularly effective when a noisy voltage such as a surge voltage is generated and the frequency band of the excessive current is equal to the frequency band of the high-frequency signal. The predetermined value means a value that can damage the signal coupling device or a communication device such as a communication modem connected to the signal coupling device.

In the second embodiment described above, the force described in the case where the coil is wound around the magnetic core 21 that also has an annular magnetic force as the inductor, the toroidal core, the EI core, the drum core, and the eyeglass core as the magnetic core. It may be a core having a shape such as a rod-shaped magnetic core.

Industrial applicability

The signal coupling device according to the present invention can be used in the field of a power line carrier communication system that transmits and receives a high frequency signal using a power line as a carrier path.

Claims

The scope of the claims

[1] A signal coupling device used in a power line carrier communication system that transmits and receives a high-frequency signal using a power line as a carrier path, the first terminal connected to the power line, and a capacitor connected to the first terminal And an inductor connected in series to the capacitor, and a second terminal connected to a communication device for transmitting and receiving the high-frequency signal connected to a connection portion between the capacitor and the inductor, the inductor being magnetic The magnetic body is configured such that the frequency region in which the Q value of the complex permeability increases at least partially matches the lower limit region of the frequency band of the high frequency signal. A signal combiner characterized by that.

[2] The signal coupling device according to claim 1, wherein a series resonance frequency of the capacitor and the inductor exists in a frequency region where a Q value of a complex permeability of the magnetic body increases.

[3] The signal coupling device according to claim 1, wherein a Q value of a complex magnetic permeability of the magnetic body at a series resonance frequency by the capacitor and the inductor is 2 or more.

4. The signal coupling device according to claim 1, wherein the magnetic body constituting the inductor is configured to be magnetically saturated when a current of a predetermined value or more flows through the inductor.

[5] A signal coupling device used in a power line carrier communication device that transmits and receives a high-frequency signal using a power line as a carrier path, the first terminal connected to the power line, and one end connected to the first terminal. A first capacitor, an inductor connected in series to the first capacitor, a second capacitor and a matching transformer connected in parallel to the inductor, and the high-frequency signal connected to the output side of the matching transformer. The inductor and the matching transformer are configured by winding a coil around a magnetic material, and the magnetic material has a Q value of its complex permeability increasing. A signal coupling device characterized in that a region coincides at least partially with a lower limit region of a frequency band of the high-frequency signal.

[6] Resonance frequency force determined by the inductance of the inductor, the self-inductance of the matching wire on the power line side of the matching transformer, and the capacitance of the first capacitor 6. The signal coupling device according to claim 5, wherein the signal coupling device exists in a frequency region in which a Q value of a complex permeability of the magnetic material increases.

6. The signal coupling device according to claim 5, wherein the magnetic body constituting the inductor is configured to be magnetically saturated when a current of a predetermined value or more flows through the inductor.