WO2008018441A1

WO2008018441A1 - Power supply device and power line communication device

Info

Publication number: WO2008018441A1
Application number: PCT/JP2007/065414
Authority: WO
Inventors: Tsunehiro Hanada; Takao Gondo
Original assignee: Panasonic Corporation
Priority date: 2006-08-08
Filing date: 2007-08-07
Publication date: 2008-02-14

Abstract

It is possible to provide a power supply device and a power line communication device capable of suppressing a peak value of a common mode current. A power connector (102) has a pair of transmission lines for making a connection to a power line for transmitting power. Power supplied from the power connector (102) is supplied via an impedance upper (291) to an AC/DC converter (301). The impedance upper (291) has a first inductance (L1) in a first path (P1) and a second inductance (L2) which is different from the first inductance (L1) in a second path (P2).

Description

Specification

Power supply device and power line communication device

Technical field

The present invention relates to a power supply device and a power line communication device.

Background art

[0002] For example, in homes and the like, various electrical devices such as information devices such as personal computers, television monitors, recording devices, image playback devices, IP (Internet Protocol) telephones, etc. are connected via a predetermined communication network. There has been proposed a system that makes it possible to easily realize a cooperative operation between a plurality of devices by connecting them in a state where they can communicate with each other. However, when performing data communication by wired communication in the home, etc., it is usually necessary to lay wiring such as cables and connectors used as transmission lines at necessary places, so a communication system has been established. Various work may be necessary when doing.

[0003] On the other hand, in most cases, a commercial power supply, for example, AC 100V (50 / 60Hz), is used in homes and the like, and power lines for supplying this power are already laid in every part of the home. Yes. Therefore, if these power lines can be used as a data communication transmission line, it is not necessary to provide a special communication line, and it is possible to secure a communication path simply by plugging a device used for communication into a commercial power outlet. It becomes possible.

[0004] Various technologies are known for power line communication technology (PLC: Power Line Communication) using such a power line for communication (for example, JP 2000-165304 A). At present, research and development are underway at various manufacturers in Japan and overseas in a specific frequency band (for example, 1.705 MHz to 30 MHz in the United States, 2 MHz to 30 MHz in Japan). Specifically, it is assumed that a multicarrier signal is generated using a plurality of subcarriers as in the OFDM (Orthogonal Frequency Division Multiplexing) method, and the multicarrier signal is transmitted through a power line. .

FIG. 28 is a diagram showing a current model on a transmission line such as a power line. The transmission line consists of a transmission line (Cl, C2) consisting of a pair of conductors that are balanced with respect to the ground (earth). In FIG. 28, a pair of voltage sources (elO e20) is provided at the left end of the transmission line. elO and e20 are the voltage generated from each voltage source (elO e20) whose characteristics such as waveform, amplitude, and phase are equal (each voltage is assumed to be “e”) 1 is given to each line (Cl C2).

[0007] A load impedance (regular load) ZL force S is provided at the right end of the transmission line. In the transmission line (Cl C2), differential (normal) mode currents (+ Id Id) flow in opposite directions.

However, parasitic impedance (ground impedance) Z1 Z3 is interposed between the transmission line and the ground (earth).

[0009] Here, the impedance value of the parasitic impedance Z2 Z3 (this value is also expressed as Z2 Z3)

) Are not equal, the common mode current Ic, which is the circulating current, flows through the parasitic impedance (ground impedance) Z1 Z3 and the ground.

[0010] If the transmission line has a sufficiently high balance, it can be considered that Z2 = Z3, and the common mode current Ic does not flow. However, in a line with a relatively low balance, Z2 ≠ Z3, and the common mode current Ic flows.

[0011] The current amount of the common mode current Ic can be expressed as follows. In the following formula (1), e represents each voltage generated from each voltage source (elO e20).

[0012] Ic = e-(Ζ2-Ζ3) / (Ζ1 · Ζ2 + Ζ2 · Ζ3 + Ζ3 · Ζ1) · · · (1)

[0013] This common mode current Ic is bifurcated and flows equally to each of the pair of transmission lines (Cl C2). Therefore, common mode current (current flow is Ic / 2) flows through each transmission line (Cl C2) in the same direction.

[0014] When the common mode current Ic flows, it causes radiation from the line. In other words, when signals of the same amplitude and opposite phase are superimposed on each of the pair of lines, the balanced state is maintained! /, In which case the radiation component radiated from each line is canceled out. In the state, there is no complete cancellation, and radiation components may leak out.

Disclosure of the invention

Problems to be solved by the invention

[0015] As a transmission line, the balance is high! /, A line (for example, an Ethernet (registered trademark) twisted pair). If a dedicated cable (such as a cable) is used, the common mode current generated on the line is suppressed to a sufficiently low level, so there is no radiation problem.

[0016] However, in a power line communication system in which a power line is used as a transmission line, there is a situation in which the common mode current generated on the transmission line becomes large because the balance of the power line is low.

[0017] In Japan, an allowable value of the quasi-peak value of the force common mode current, which is expected to be approved for the 2-30 MHz frequency band for power line communication, is scheduled. Therefore, there is a situation in which the peak value of the common mode current in the frequency band used for power line communication needs to be suppressed below a predetermined allowable value.

[0018] The present invention has been made in view of the above circumstances, and solves the problem of providing a power supply device and a power line communication device capable of suppressing a peak value of a common mode current. Means to do

In the present invention, first, a power line connecting portion (400) that can be connected to a power line (900) having at least two transmission lines and transmitting power, and the power line connecting portion (400) are provided. A power supply unit (300) that receives the power supply via the power line connection unit (400) and an inductor unit (290: 291) provided between the power line connection unit (400) and the power supply unit (300), The inductor section (290; 291) has a first inductance (L 1), a first path (P 1) connected to one of the transmission lines, and the first inductance (L 1) Has a second inductance (L2) different from each other, and a power supply apparatus comprising a second path (P2) connected to a transmission line different from the transmission line connected to the first path (P1). It is provided.

[0020] With this configuration, for example, when the power supply device is connected to a single-phase power supply! /, The inductance in the two paths between the power supply connection portion and the power supply portion becomes unbalanced. It is possible to suppress the difference in the common mode current value due to the plugging direction of the outlet connected to the, and to suppress the peak value of the common mode current.

[0021] Secondly, the present invention provides the power supply device according to the first, wherein the inductor section (290: 291) is provided in the first path (P1). A first inductor having an inductance (L 1) (eg, 11a) and the second inductor (2) provided in the second path (P2) A power supply device comprising a second inductor (1 lb) having an inductance (L2) is provided.

[0022] With this configuration, an inductor is inserted separately in each path, so that an inductance value with a high degree of freedom in the mounting position can be easily adjusted.

[0023] Third, the power supply device according to the second aspect, wherein the first inductor (eg, 11a) includes a third inductor (l lal) having a predetermined inductance and A power supply device having a fourth inductor (1 la2) is provided.

[0024] With this configuration, the third inductor and the fourth inductor are provided in the first path, and the inductance of the two paths is unbalanced, so that the inductance can be easily and finely adjusted, and the power supply The degree of balance in the section can be improved.

[0025] Fourth, the power supply device according to the first aspect, wherein the inductor section (290; 291) is a first coil provided in the first path (P1). Part (12a) and a common mode choke coil having a second coil part (12b) inserted in the second path (P2) and having a different number of turns from the first coil part (12a) A power supply device comprising (12) is provided.

[0026] With this configuration, the inductance of the two paths can be unbalanced with a single component of only the common mode choke coil, so that variations in the power supply device can be suppressed.

[0027] The fifth aspect of the present invention is the power supply device according to the first aspect, wherein the inductor section (290; 291) includes the first path (P1) and the second path (P2 ) And a common mode choke coil (13a) having the same number of turns, and the first path (P1) and the second path (P2)! / There is provided a power supply device including an inductor provided on either side.

[0028] With this configuration, the inductance of the two paths is unbalanced using an inductor in addition to the common mode choke coil, so that the inductance value can be easily and finely adjusted. The degree can be improved.

[0029] Sixthly, the present invention provides the power supply apparatus according to any one of the first to fifth aspects, wherein the inductor section (290; 291) at least removes an AC power supply frequency. Frequency band signal A power supply device having a characteristic of attenuating a signal is provided.

[0030] With this configuration, the inductor unit can be used with a power to cut off unnecessary frequency band signals even when the power supply device is connected to a power line communication system that performs communication in a high frequency band using a power line.

[0031] Seventhly, the present invention provides the power supply device according to any one of the first to sixth aspects, wherein the fuse (282) connected to the power line connection portion (400) and the inductor portion (290; 291) and a second common mode choke coil (21a) connected between the fuse and the first surge absorbing element (281). And a power supply device further comprising the above.

[0032] With this configuration, it is possible to reduce the common mode current in the common mode choke coil while protecting the circuit on the opposite side of the power spring connection in the first surge absorbing element against the surge.

[0033] Eighthly, according to the present invention, there is provided the power supply apparatus according to the seventh aspect, wherein the second common mode choke coil (21a) has a self-resonance frequency of 20 megahertz or more. Is.

[0034] In the short wave band, the common mode current tends to increase as the frequency increases. Force S, the common mode choke coil, the higher the self-resonant frequency, the lower the common mode current on the high frequency side. To do. Therefore, with this configuration, even when the power supply device is used in a short-wave power line communication system, the high-frequency side common mode current can be obtained by using the second common mode choke coil having a self-resonance frequency of 20 MHz or higher. Reduce force by S.

[0035] Ninthly, the power supply device according to the seventh or eighth aspect is provided between the fuse (282) and the second common mode choke coil (21a). A power supply apparatus further comprising a second surge absorbing element (22) having a capacity smaller than that of the first surge absorbing element (281) is provided.

With this configuration, it is possible to protect the second common mode choke coil against a surge in the second surge absorbing element while reducing the common mode current.

[0037] Tenthly, the present invention provides the power supply device according to any one of the first to ninth, The power supply connection unit (400) is provided with a power supply device including a power supply cable (601) in which at least two electric wires connected to each of the transmission lines are twisted.

[0038] With this configuration, the balance is improved by the power supply cable in the stranded state, so that the common mode current can be reduced.

[0039] Eleventhly, the present invention provides a power line communication device (100) comprising the power supply device described in any one of the first to tenth.

[0040] With this configuration, the power S can be provided to provide a power line communication device that suppresses the peak value of the common mode current.

[0041] A twelfth aspect of the present invention is the power line communication device (100) according to the eleventh aspect, wherein the transmission unit (1) outputs a transmission signal to be transmitted via the power line (900). And the secondary winding connected to the transmission section (1) and the branch section between the power line connection section (400) and the inductor section (290; 291) to transmit the transmission signal to the power line ( 900) is connected to the primary winding of the force plastic transformer (271), and the frequency band of the AC voltage is more dependent on the frequency band of the transmission signal. A capacitor section (272a, 272b) having high impedance and a third common mode choke coil (31) connected between the capacitor section (272a, 272b) and the transmitter section (1) are further added. A power line communication device is provided.

[0042] With this configuration, since the common mode choke coil is arranged in the signal system, even when the power supply device handles a large current, the common mode choke having a large common mode impedance without increasing the size of the common mode choke coil. A coil can be used, and the common mode current can be reduced.

[0043] A thirteenth aspect of the present invention is the power line communication device (100) according to the twelfth aspect, wherein the third common mode choke coil (31) includes the capacitor unit and the force plastic transformer. A power line communication device connected between the primary winding is provided.

With this configuration, the common mode choke coil can be arranged in the signal system.

[0045] In the fourteenth aspect, the power line communication device (100) according to the twelfth aspect, wherein the third common mode choke coil (21) includes the transmitter, the force plastic transformer ( 271) is connected to the secondary winding of the power line communication device. With this configuration, the common mode choke coil can be disposed in the signal system.

[0047] The fifteenth aspect of the present invention is the power supply device according to the first aspect, wherein a ratio of the second inductance to the first inductance is 1.2;! To 2 A power supply is provided.

[0048] With this configuration, it is possible to suppress the common mode current and to reduce the level difference of the common mode current due to the outlet insertion direction.

[0049] Sixteenth, the power supply device according to the fifteenth aspect, wherein the ratio of the second inductance to the first inductance is 1.3 to 2. It is provided.

[0050] With this configuration, it is possible to suppress the common mode current and to reduce the level difference of the common mode current due to the outlet insertion direction.

The invention's effect

[0051] According to the present invention, it is possible to provide a power supply device and a power line communication device capable of suppressing the peak value of the common mode current.

Brief Description of Drawings

[0052] FIG. 1 is an external perspective view of a communication device according to an embodiment of the present invention.

FIG. 2 is a front view of a communication device according to an embodiment of the present invention.

FIG. 3 is a rear view of the communication device according to the embodiment of the present invention.

FIG. 4 is a block diagram showing an example of a basic hardware configuration of the communication device according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram showing an impedance adjuster of the communication device according to the first embodiment of the present invention.

[Fig.6] Diagram showing frequency common-mode current characteristics when impedance impedance bar with balanced! /, Inductance (LI = L2 = 100 μΗ) is used

[Fig. 7] Diagram showing frequency common-mode current characteristics when an impedance amplifier with unbalanced inductance (L1 = 100 _ί Η, L2 = 122 _i u H) is used.

[Figure 8] Diagram showing frequency common-mode current characteristics when an impedance amplifier with unbalanced inductance (L1 = 100 〃 H, L2 = 147 μ Η) is used

FIG. 9 shows a specific configuration of the impedance adjuster of the communication device according to the first embodiment of the present invention. Diagram showing the first example

10] A diagram showing a second example of the specific configuration of the impedance adjuster of the communication device according to the first embodiment of the present invention.

11] A diagram showing a third example of the specific configuration of the impedance adjuster of the communication device according to the first embodiment of the present invention.

12] A diagram showing a fourth example of the specific configuration of the impedance adjuster of the communication device according to the first embodiment of the present invention.

FIG. 13 is a configuration diagram showing a part of a communication apparatus according to a second embodiment of the present invention.

14] A diagram showing frequency common mode current characteristics of the communication device according to the second embodiment of the present invention.

FIG. 15 is a configuration diagram showing a part of a comparative example of a communication device according to the second embodiment of the present invention. 16] Frequency-common mode current of a comparative example of the communication device according to the second embodiment of the present invention. Diagram showing characteristics

[Figure 17] Diagram showing frequency impedance characteristics for each number of turns of common mode choke coil

[Fig.18] Frequency of common mode choke coil according to number of turns Common mode current characteristics

FIG. 19 is a configuration diagram showing a part of a modification of the communication device according to the second embodiment of the present invention. FIG. 20 has an unbalanced inductance in the communication device according to the second embodiment of the present invention. Diagram showing frequency common mode current characteristics when impedance amplifier is used

FIG. 21 is a configuration diagram showing a part of a first example of a communication apparatus according to a third embodiment of the present invention. FIG. 22 is a part of a second example of a communication apparatus according to the third embodiment of the present invention. Fig. 23] is a diagram showing frequency common mode current characteristics of the communication device according to the third embodiment of the present invention.

FIG. 24 is a diagram showing frequency common mode current characteristics when an impedance amplifier having an unbalanced inductance is used in the communication device according to the third embodiment of the present invention. 25] Explanatory drawing showing a power cable according to a fourth embodiment of the present invention

FIG. 26 is a diagram showing frequency common mode current characteristics when the power cable according to the fourth embodiment of the present invention is used in the communication apparatus according to the second embodiment of the present invention. For the communication device according to the second embodiment, an impedance amplifier having an unbalanced inductance and a power cable according to the fourth embodiment of the present invention are used.

V, frequency when applied Common mode current characteristics

[Fig.28] Diagram showing current model on transmission line

[Fig.29] Diagram showing frequency common mode current characteristics when using impedance impedance bar with balanced (/ L2 = 220 μΗ) inductance!

[Fig.30] A graph showing the frequency common mode current characteristics when using an impedance transformer with balanced inductance (LI = L2 = 330 μΗ).

[Fig.31] Diagram showing frequency common mode current characteristics when an impedance amplifier with unbalanced inductance (L1 = 100 〃 H, L2 = 133 〃 Η) is used.

[Fig.32] Diagram showing frequency common mode current characteristics when an impedance amplifier with unbalanced inductance (L1 = 100 〃 H, L2 = 168 〃 H) is used.

[Fig.33] Frequency common mode current characteristics when an impedance amplifier with an unbalanced inductance (L1 = 100〃H, L2 = 200μΗ) is used.

[Fig.34] Diagram showing frequency common mode current characteristics when an impedance amplifier with unbalanced inductance (L1 = 220〃 H, L2 = 267〃 Η) is used.

[Fig.35] Diagram showing frequency common mode current characteristics when an impedance amplifier with unbalanced inductance (L1 = 220〃H, L2 = 288〃 Η) is used.

[Fig.36] Diagram showing frequency common mode current characteristics when an impedance amplifier with unbalanced inductance (L1 = 220〃H, L2 = 320μ μ) is used.

[Fig.37] Diagram showing frequency common mode current characteristics when an impedance amplifier with unbalanced inductance (L1 = 220〃H, L2 = 370〃〃) is used.

[Fig.38] Diagram showing frequency common mode current characteristics when an impedance amplifier with unbalanced inductance (L1 = 220 a H, L2 = 440 μΗ) is used.

[Fig.39] Impedance with unbalanced inductance (L1 = 330〃 H, L2 = 398 μΗ) Diagram showing frequency common mode current characteristics when one dance amplifier is used

[Fig.40] Frequency common mode current characteristics when impedance impedance with unbalanced inductance (L1 = 330 a H, L2 = 430 μΗ) is used.

[Fig.41] Diagram showing frequency common mode current characteristics when an impedance amplifier with unbalanced inductance (L1 = 330 H H, L2 = 480 μ μ) is used.

[Fig.42] Diagram showing frequency common mode current characteristics when an impedance amplifier with unbalanced inductance (L1 = 330 a H, L2 = 550 μ550) is used.

[Fig.43] Relationship between L2 / L1 and Δ CMI (L1 = 100 H)

[Fig.44] Relationship between L2 / L1 and Δ CMI (L1 = 220 μ μ)

[Fig.45] Relationship between L2 / L1 and Δ CMI (L1 = 330 μΗ)

Explanation of symbols

1 Transmitter

2 Receiver

11a, l ib, 13b inductor

12, 13a, 21a, 21b, 31, 32 Common mode choke coin

22, 281 Surge Absorber

41 and 42 electric wires

100 communication equipment

101 housing

102 Power connector

103 Modular jack

104 Display

104a, 104b, 104c LED

200 circuit module

210 Main IC

211 CPU

212 PLC 'MAC, lock

213 PLC 'PHY F, lock 220 AFE-IC

221 D / A converter (DAC)

222 A / D converter (ADC)

223, 224 Variable amplifier (VGA)

230 Ethernet (registered trademark) PHY'IC

240 memory

251 Rhino Sufinoleta

252 drivers

261 ND

270 power bra

271 Coil transformer

271a Primary winding

271b Secondary winding

272a, 272b Coupling console

282 fuse

290, 291 Impedance adjustment

299 bifurcation

300 Switching power source

301 AC / DC converter

400 Power plug

500 outlet

600, 601 Power cable

900 power line

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, a communication device according to an embodiment of the present invention will be described with reference to the drawings. As an example of a communication device, a communication device that uses a power line as a transmission line and performs broadband communication (2 to 30 MHz) of a multicarrier communication method will be described as an example.

First, an outline of the communication device will be described. As an example of a communication device, A PLC (Power Line Communication) modem, one of the communication devices, will be explained.

The communication apparatus 100 shown in FIGS. 1 to 3 has a housing 101, and a front surface of the housing 101 (as shown in FIGS. 1 and 2): LED (Light Emitting Diode ) A display unit 104 having 104a, 104b, 104c is provided, and on the back of the housing 101, as shown in Fig. 3, a power connector 102 and a LAN (Local Area Network) such as RJ45 are used. A modular jack 103 is provided.

[0057] The power connector 102 is a power cable 600 such as a parallel cable (for example, WF cable).

(See Fig. 4). A LAN cable (not shown) is connected to the modular jack 103.

As shown in FIG. 4, the communication device 100 includes a circuit module 200, a switching power supply 300, and an AC / DC conversion unit 301.

[0059] The switching power supply 300 supplies various voltages (for example, +1.2 V, +3.3 V, +12 V) to the circuit module 200, and includes, for example, a line filter, a switching transformer, and a DC — Consists of DC converters (none shown). The AC / DC conversion unit 301 converts the AC power supplied from the power line 900 via the power connector 102 into DC and supplies it to the switching power supply 300. Note that the switching power supply 300 and the AC / DC conversion unit 301 function as an example of a power supply unit that receives supply of power from the power line 900.

[0060] The circuit module 200 includes a main IC (Integrated Circuit) 210, an AFE-IC (Analog Front End IC) 220, an Ethernet (registered trademark) PHY'IC (Physical Layer Integrated Circuit) 230, a memory 240, and a low pass. A filter (LPF) 251, a dry IC 252, a band pass filter (BPF) 260, a coupler 270, a surge-absorber 281, a fuse 282, and an impedance adjuster 290 are provided.

The main IC 210 includes a CPU (Central Processing Unit) 211, a PLC-MAC (Power Line Communication Media Access Control layer) block 212, and a PLC * PHY (Power Line Communication Physical layer) block 213. The CPU 211 implements a 32-bit RISC (Reduced Instruction Set Computer) processor. PLC 'MA C block 212 manages the MAC layer (Media Access Control layer) of the transmission signal, The PHY block 213 manages the PHY layer (Physical layer) of the transmission signal.

[0062] The AFE-IC220 is a D / A converter (DAC: D / A Converter) 221, A / D converter

(ADC: A / D Converter) 222 and variable amplifier (VGA)

) 223, 224.

[0063] The coupler 270 and the impedance adjuster 290 are a surge-absorber 281 and a fuse 2

82 is connected to the power connector 102 via a power cable 600 and a power plug 400.

The power line 900 is connected through the outlet 500.

[0064] The surge absorber 281 functions as an example of the first surge absorbing element.

The circuit connected to the opposite side of the power connector 102 with the surge absorber 281 interposed therebetween is protected from a surge input from the power line 900 side. In the present embodiment, the surge absorber 281 has a capacitance value of 50 [pF] or more.

[0065] The impedance amplifier 290 has a characteristic of attenuating at least a signal in a frequency band excluding the AC power supply frequency. From the signal supplied to the AC / DC conversion unit 301, for example, a signal of an unnecessary high frequency component as a power supply Can be cut off.

[0066] The power line 900 has at least two transmission lines to transmit power. In the present embodiment, a power line that transmits single-phase AC power having a pair of transmission lines will be described as an example. The power connector 102, or the power connector, the power cable 600, and the power plug 400 function as an example of a power line connection unit that can be connected to the power line 600.

[0067] Cuff. The LA 270 includes a coin transformer 271 and coupling capacitors 272a and 272b.

Note that the CPU 211 uses the data and control program stored in the memory 90 to control the operation of the PLC 'MAC block 212 and the PLC' PHY block 213, and also controls the entire communication device 100. .

[0069] The communication device 100 performs multicarrier communication using a plurality of subcarriers such as an OFDM (Orthogonal Frequency Division Multiplexing) method, and the digital signal processing for performing such transmission is performed by the main IC 210. Especially done with PLC 'PHY Block 213

[0070] Here, PLC 'PHY block 213, DAC221, VGA223, LPF251, dry IC25 2 operates as a transmitter 1. The PLC 'PHY block 213, ADC 12, VGA 224, and BPF 2 61 function as the receiver 2.

In the above description, a modem is shown as an example of a power line communication device. However, an electric device (for example, a home appliance such as a television) including a modem that is not particularly limited to this may be used.

[0072] (First embodiment)

FIG. 5 is a diagram showing an impedance adjuster of the communication apparatus according to the first embodiment, and the same reference numerals are given to portions overlapping with FIG. As shown in FIG. 5, the power connector 102 is connected to the branch portion 299 by a pair of electric wires. Between the power connector 102 and the branch portion 299, a fuse 282 is inserted into one electric wire, and a surge absorber 281 is inserted between the pair of electric wires. Each of the pair of electric wires branches in two directions at the branching portion 299, one is connected to the force bra 270, and the other is connected to the AC / DC converting portion 301 via the impedance upper 291. The configuration beyond coupler 270 and AC / DC converter 301 as seen from branch 299 is the same as that in FIG.

The impedance amplifier 291 has a characteristic of attenuating a signal in a frequency band excluding at least the AC power supply frequency, like the impedance amplifier 290 described with reference to FIG. However, the impedance amplifier 291 has a first inductance L1 and has a first path P1 connected to one of the transmission lines of the power line 600 and a second inductance L2, and the transmission line of the power line 600 And a second path P2 connected to one side. The first inductance L1 and the second inductance L2 are different values. That is, the impedance amplifier 291 has an unbalanced inductance. The impedance adjuster 291 functions as an example of an inductor unit provided between the power connector 102 and the AC / DC conversion unit 301. In the following description, inductance refers to an induction coefficient, and inductor refers to a circuit element having a predetermined inductance.

FIG. 6 is a diagram showing frequency common mode current characteristics when an impedance amplifier having a balanced inductance (inductance of 100 [〃H] for each path) is used. The two characteristics shown in FIG. 6 are the characteristics when the insertion direction of the power plug 400 into the outlet 500 is changed. That is, Figure 6 As can be seen, the difference in the common mode current depends on the direction in which the outlet plug is inserted.

[0075] Since the signal of the power line communication device is a differential signal, the wiring pattern and component constants are the same to improve the balance in order to improve the balance of the device itself. However, it is difficult to make the component arrangement and wiring pattern completely symmetric, resulting in some unbalance.

Therefore, the communication device of the present embodiment intentionally destroys the inductance balance of the impedance adjuster 291 to change the LCL (Longitudinal Conversion Loss) in a specific frequency range, thereby changing the outlet. It reduces the common mode current difference that occurs depending on the direction in which the plug is inserted, and suppresses the peak value of the common mode current.

FIGS. 7 to 8 are diagrams illustrating frequency common mode current (CMI) characteristics when an impedance amplifier having an unbalanced inductance is used. Figure 7 shows inductance 1 = 100 [〃 ^ 1] and inductance 2 = 122 [〃 ^ 1]. Figure 8 shows inductance L1 = 100 [〃 H] and inductance L2 = 147 [〃 In the case of [H], the respective characteristics when the insertion direction of the power plug 400 into the outlet 500 is changed are shown.

[0078] As shown in FIGS. 7 to 8, the impedance amplifier 291 has an unbalanced inductance, so that the level difference of the common mode current due to the outlet insertion direction is reduced and the common mode current is reduced. It can be seen that the peak value decreases.

Next, a specific configuration example of the impedance adjuster 291 of the present embodiment will be described. FIG. 9 is a diagram showing a first example of a specific configuration of the impedance amplifier. As shown in FIG. 9, the impedance adjuster 291 includes an inductor 11a provided in the first path P1 and an inductor l ib provided in the second path P2. The inductor 11a functions as an example of a first inductor and has a first inductance L1. The inductor l ib functions as an example of a second inductor and has a second inductance L2.

[0080] As a result, the inductors 11a and l ib are separately provided in each path, so that the degree of freedom of the mounting positions of the inductors 11a and l ib is high, and the inductance value can be easily adjusted. And force S.

FIG. 10 is a diagram showing a second example of a specific configuration of the impedance amplifier. As shown in FIG. 10, the impedance amplifier 291 includes an inductor l lal and an inductor l la2 provided in the first path P1, and an inductor l ib provided in the second path P2. The inductor l lal functions as an example of a third inductor, and has, for example, a second inductance L2. Further, the inductor l la2 functions as an example of a fourth inductor, and has an inductance whose combined inductance with the inductor l lal becomes the first inductance L1. The inductor l ib functions as an example of a second inductor and has a second inductance L2.

H], the inductance of inductor l lal is 100 [〃 H], the inductance of inductor 11 a2 is 22 [〃 H], and the inductance of inductor 1 lb is 100 [〃 H].

That is, the inductor l lal and the inductor l ib have equal inductances. Then, the inductance unbalance amount between the paths of the impedance amplifier 291 is adjusted by the inductor l ib. As a result, the inductance values of the first path and the second path can be easily adjusted with high strength, and the balance in the AC / DC conversion unit 302 can be improved.

Note that the inductance of the inductor l lal does not have to be the second inductance L2, and the inductor l lal and the inductor l la2 may be configured so that the combined inductance is L1.

FIG. 11 is a diagram showing a third example of a specific configuration of the impedance amplifier. As shown in FIG. 11, the impedance adjuster 291 includes a common mode choke coil 12. The common mode choke coil 12 includes a first coil part 12a provided in the first path P1 and a second coil provided in the second path P2 and having a different number of turns from the first coil part 12a. Part 12b. In this manner, the impedance amplifier 291 can have an unbalanced characteristic in which the first path P1 has the first inductance Ll and the second path P2 has the second inductance L2. .

[0086] As a result, only the common mode choke coil 12 is used in the impedance amplifier 291. Because the inductance of the two paths can be unbalanced with one component, variation between devices can be suppressed.

FIG. 12 is a diagram showing a fourth example of a specific configuration of the impedance amplifier. As shown in FIG. 12, the impedance amplifier 291 includes a common mode choke coil 13a inserted in each of the first path P1 and the second path P2 and having a coil portion having the same number of turns. And an inductor 13b provided in one of the first path P1 and the second path P2 (the first path P1 in FIG. 12).

[0088] In the common mode choke coin 13a, the impedance amplifier 291 is an inductor provided in the path of one of the forces in which the inductance is balanced in the first path P1 and the second path P2. By 13b, it has an unbalanced characteristic.

Accordingly, the inductance values of the first path and the second path can be easily and finely adjusted, so that the balance in the AC / DC converter 302 can be improved.

Yes

[0090] Thus, in the portion corresponding to the power supply device (for example, the portion from the power plug 500 to the switching power supply 300 via the branching portion 299), the inductance in the two paths for transmitting power is unbalanced. Thus, the difference in common mode current value due to the plugging direction of the outlet connected to the power line is suppressed, and the peak value of the common mode current is suppressed with the force S.

[0091] Next, frequency common mode current characteristics when an impedance amplifier having a balanced inductance is used will be described for examples other than FIG.

[0092] FIG. 29 is a diagram showing frequency common mode current characteristics when an impedance amplifier having a balanced inductance (inductance of 220 [H] for each path) is used, and FIG. It is a figure which shows the frequency common mode current characteristic when the impedance amplifier which has the inductance (33 0 [H] inductance about each path | route) which is balanced is used. The frequency range at which the common mode current was measured is 2 to 30 MHz, the same as in Figure 6. The two characteristics shown in Fig. 29 and 30 are the same when the direction of inserting the power plug 400 into the outlet 500 is changed. It is a characteristic. As is clear from Figs. 29 and 30, the common mode current varies depending on the direction in which the outlet plug is inserted. Therefore, the same tendency as in Fig. 6 can be achieved.

[0093] The results of the measurements in FIGS. 6, 29, and 30 are shown in Table 1 below.

[0094] [Table 1]

[0095] In Table 1, the maximum CMI value is the maximum common-mode current value obtained in each measurement. The first average CMI value is the average value of the common mode current measured in the range of 2 to 30 MHz in the case of the first insertion direction. The second average CMI value is the average value of the common mode current measured in the range of 2 to 30 MHz in the second insertion direction. ACMI is the difference (absolute value) between the first average CMI value and the second average CMI value. The lower the ACMI value, the smaller the level difference of the common mode current depending on the outlet insertion direction, and the power supply balance is improved.

Next, frequency common mode current characteristics when an impedance amplifier having an unbalanced inductance is used will be described with reference to examples other than FIG. 7 and FIG.

FIGS. 31 to 42 are diagrams showing frequency common mode current (CMI) characteristics when an impedance amplifier having an unbalanced inductance is used. Figure 31 shows inductance 1 = 100 [^ 1] and inductance 2 = 133 [^ 1]. Figure 32 shows inductance 1 = 100 [^ 1], inductance 2 = 168 [ In the case of ^ 1], Fig. 33 shows an inductance of 1 = 100 [〃 ^ 1], inductance of 2 = 200 [〃 ^ 1], and Fig. 34 shows an inductance of 1 = 220 [〃 ^ 1]. When inductance L2 = 267 [〃H], Fig. 35 shows inductance 1 = 220 [〃 ^ 1], inductance 2 = 288 [〃 ^ 1], Fig. 36 shows inductance 1 = 220 [〃 ^ 1], inductance 2 = 320 [〃 ^ 1], Figure 37 shows inductance L If 1 = 220 [〃 ^ 1] and inductance 2 = 370 [〃 ^ 1], Figure 38 shows the diagram for inductance L1 = 220 [〃Η] and inductance 2 = 440 [〃 ^ 1]. 39 is inductance Ll = 330 [〃 ^ 1] and inductance 2 = 398 [〃 ^ 1]. Figure 40 is inductance Ll = 33 0 [H] and inductance L2 = 430 [H]. Figure 41 shows the case where inductance L1 = 330 [H] and inductance 2 = 480 [^ 1]. Figure 42 shows the case where inductance L1 = 330 [H] and inductance L2 = 550 [ _ί H]. Each characteristic when the insertion direction of the power plug 400 into the outlet 500 is changed is shown.

The measurement results of FIGS. 31 to 42 are shown in Table 2 below.

[0099] [Table 2]

H) Maximum CMI value (dBwA) 1st CMI value (dB iA) 2nd CMHii (dB A) ACMKdBwA) L2 / L1 Resonance 1 L2 = 100 27.56 (@ 26.01 Hz) 11.89 9.45 2.44 1

Ll = 100, then 2 = 103.3 27.91 (@ 22.62 Hz) 12.41 8,9F 3.44 1.03

U = 100, L2 = 110 30.58 (@ 20.17MHz) 11.92 8.98 2.94 1.1 Yes

L1 = 100, L2 = 115 25.24 (@ 24.12MHz) 11.67 9.55 2.12 1.15 Yes

L1 = 100, L2 = 122 25.85 (@ 26.99MHz) 11.95 9.59 2.36 1.22 1 = 100, L2 = 133 26.43 (@ 22.90MHz) 11.71 9.92 1.79 1.33

L1 = 100, L2 = 147 25.93 (@ 22.13MHz) 11.87 9.92 1.95 1.47

L1 = 100, L2 = 150 26.28 (@ 23.81MHz) 12.01 9.59 2.42 1.5

L1 = 100.L2 = 168 25.89 (@ 26.29MHz) 11.57 9.58 1.99 1.68 and 1 = 100, L2 = 200 25.86 (@ 20.66MHz) 11.66 9.65 2.01 2

L1 = 100, L2 = 220 27.35 (@ 23.63MHz) 12.93 9.23 3.7 2.2

(L1 = 100, L2 = 330 27.64C@22.86MHz) 13.45 8.77 4,68 3.3

(L1 = L2 = 220 26.25 C@21.88MHz) 12.36 9.67 2.69 1

L1 = 220, L2 = 223.3 28.24 (@ 27.13MHz) 12.84 9.19 3.65 1.01

L1 = 220, L2 = 224.7 32.20 (@ 26.92 Hz) 13.58 8.87 4.71 1.02 Yes

L1 = 220, L2 = 226.8 33.53 (@ 22.65MHz) 13.51 10.27 3.24 1.03 Yes

L1 = 220.L2 = 230 31.96 (@ 18.66MHz) 12.26 10.09 2.17 1.05 Yes

L1 = 220, L2 = 235 26.40 (@ 14.60MHz) 11.82 10.2 1.62 1.07 Yes

Ll = 220, L2 = 242 26.55 (@ 23.25MHz) 11.82 10.29 1.53 1.1 Yes

L1 = 220, L2 = 253 26.22 (@ 24.01MHz) 11.56 10.33 1,23 1.15

L1 = 220, L2 = 267 25.84 (@ 22.62MHz) 11.6 10.47 1.13 1.21

L1 = 220, L2 = 288 25.51 (@ 22.65MHz) 11.51 10.54 0.97 1.31

L1 = 220, L2 = 320 25.77 (@ 24.02MHz) 11.55 10.47 1.08 1.45

L1 = 220, 2: 370 25.56 (@ 22.62MHz) 11.42 10.54 0.88 1.68

L1 = 220, 2: 440 26.50 (@ 22.62MHz) 11.76 9.83 1.93 2

L1 = L2 = 330 26.92 (@ 24.65MHz) 11.92 9.47 2.45 1

L1 = 330, L2 = 334.7 35.26 (@ 26.89MHz) 13.45 9.08 4.37 1.01 Yes

(L1 = 330, L2 = 336.8 34.31C@22.62MHz) 12.9 9.72 3.18 1.02 Yes

LI 330 'L2 340 30.1l (@ 18.45MHz) 11.89 9.76 2.13 1,03 Yes

L1 = 330, L2 = 345 27.44 (@ 27.31 Hz) 11.18 9.83 1.35 1.05 Yes

L1 = 330, L2 = 352 27.33 (@ 27.90 Hz) 11.16 9.81 1.35 1.07 Yes

L1 = 330, L2 = 363 26.70 (@ 27.62MHz) 11.06 10.09 0.97 1.1 Yes

L1 = 330, L2 = 377 28.19 (@ 27.66 Hz) 10.98 10.26 0.72 1.14 Yes

L1 = 330.L2 = 398 25.53 (@ 26.64MHz) 10,84 10.27 0.57 1.21

L1 = 330.2 = 430 25.20 (@ 27.87 Hz) 10.97 10.31 0.66 1.3

L1 = 330, L2 = 480 25.85 (@ 27.87 Hz) 10.63 10.23 0.4 1.45

L1 = 330, L2 = 550 25.54 (@ 24.82 Hz) 11.24 10.22 1.02 1.67

[0100] In Table 2, the definition of the maximum CMI value etc. is the same as in Table 1. L2ZL1 is the ratio of the second inductance to the first inductance. Resonance is a common-mode current that greatly exceeds legal limits. Table 2 shows the presence or absence of resonance confirmed in each measurement.

[0101] Fig. 43 45 shows the relationship between L2 / L1 and ACMI. Figure 43 shows Ll = 100

Figure 44 shows: LI = 220 Figure 45 shows: LI = 330 H. Figure 43 to Figure 4 In FIG. 5, the broken line indicates the value of A CMI when L2 / L1 = 1.

[0102] As is clear from Fig. 31 to Fig. 45 and Table 2, the impedance adjuster 291 has an unbalanced inductance, so that when L2 / L1 is in the range of 1 It can be seen that the peak value of the common mode current tends to decrease as the mode current level difference decreases. Specifically, the maximum CMI value can be confirmed to decrease by approximately 2% to 7% with two exceptions. The first average CMI value, with one exception, can be seen to decrease by approximately 1% to 11%. In addition, the value of A CMI can be confirmed to decrease by 4% to 83%, without exception. In Fig. 43 to Fig. 45, even when L2 / L1 is 1.2 or less, the force that can confirm that AC MI is below the broken line. When L2 / L1 is 1.2 or less, the common mode that greatly exceeds the regulatory value. Since current resonance occurs, the ratio between the first inductance and the second inductance is not appropriate.

[0103] (Second Embodiment)

FIG. 13 is a configuration diagram illustrating a part of the communication apparatus according to the second embodiment. In FIG. 13, parts that are the same as those in FIG. 5 described in the first embodiment are given the same reference numerals.

Yes

As shown in FIG. 13, the communication apparatus includes a common mode choke coil 21 _a that is connected between a surge absorber 281 and a fuse 282 and functions as an example of a second common mode choke coil.

FIG. 14 is a diagram illustrating frequency common mode current characteristics of the communication device according to the second embodiment. In FIG. 14, the characteristic C200 is a characteristic when the common mode choke coil 21a as shown in FIG. 13 is not inserted, and the characteristic C201 is connected to the common mode choke coil 21a as shown in FIG. It is a characteristic when it is done.

As shown in FIG. 14, when the common mode choke coil 21a is connected, the

It can be seen that the common mode current is reduced in the high range above [MHz].

Next, the characteristics of the common mode current depending on the position where the common mode choke coil is connected will be described using a comparative example.

FIG. 15 is a configuration diagram showing a part of a comparative example of the communication device according to the second embodiment. Figure

As shown in FIG. 15, the common mode choke coil 21b is It is connected to the rear stage of the Jab Sover 281.

FIG. 16 is a diagram showing frequency common mode current characteristics of a comparative example of the communication device according to the second embodiment. In FIG. 16, the characteristic C200 is the same characteristic as the characteristic C200 of FIG. 14, and the characteristic C202 is a characteristic when the common mode choke coil 21b as shown in FIG. 15 is connected.

[0110] As shown in Fig. 16, when the common mode choke coil 21b is connected, the common mode choke coil 21a is connected, particularly in the high frequency range of 15 [MHz] or higher. It can be seen that the common mode current is reduced.

Here, comparing the characteristic C201 shown in FIG. 14 with the characteristic C202 shown in FIG. 16, the characteristic common mode current of the characteristic C201 is reduced by the characteristic C202. In other words, it can be seen that the common mode choke coil can reduce the common mode current when it is provided at the front stage as compared with the rear stage of the surge absorber 281 when viewed from the power connector 102.

[0112] Since the common mode choke coil 21a is relatively resistant to surges, in the present embodiment, the common mode choke coil 21a is provided in the front stage when viewed from the power connector 102, thereby reducing the common mode current! /, High! /, The ability to get an effect.

Next, the common mode current characteristics depending on the number of turns of the common mode choke coil will be described.

FIG. 17 is a diagram showing frequency impedance characteristics according to the number of turns of the common mode choke coil. In Fig. 17, the characteristics C21;! To C215 indicate the frequency impedance characteristics of common mode choke coils with different numbers of turns. It shows Tokusei C212, Tokusei C213, Tokusei C214, Tokusei C215.

[0115] As shown in Fig. 17, the impedance of the common mode choke coil increases as the number of turns increases. It can also be seen that as the number of turns increases, the frequency indicating the peak of the impedance value decreases, that is, the self-resonant frequency, which is a frequency changing from inductive to capacitive, decreases.

[0116] Fig. 18 shows the frequency common mode current characteristics for each number of turns of the common mode choke coil. Fig. 18 (A) shows the characteristics C221, Fig. 18 (B) shows the characteristics C222, and Fig. 18 ( C) The characteristic C223 is shown in FIG. 18D, and the characteristic C224 is shown. Characteristics C22;! To C224 indicate the frequency common mode current characteristics when the common mode choke coil 21a has a different number of turns. The characteristics C221, the characteristics C222, the characteristics C223, and the characteristics C2 24 are shown in order from the smallest number of turns of the common mode choke coil 21a. The number of turns of the common mode choke coil showing characteristics C221 to C224 is the same as the number of turns of the common mode choke coil showing characteristics C211 to C214.

[0117] As shown in Fig. 18, when the number of turns of the common mode choke coil is large, the common mode current tends to increase on the low frequency side and increase on the high frequency side. On the other hand, when the number of turns of the common mode choke coil is small, the common mode current tends to increase on the low frequency side and decrease on the high frequency side.

Here, as shown in FIG. 18, the common mode current does not depend on the number of turns and tends to increase as the frequency increases as a whole. Therefore, in order to suppress the peak value of the common mode current, it is necessary to reduce the common mode current on the high frequency side. Therefore, a common mode choke coil having a small number of turns, that is, a common mode choke coil having a high self-resonant frequency (preferably having a self-resonant frequency force of ¾0 [MHz] or more) as described in FIG. Is preferred!

FIG. 19 is a configuration diagram showing a part of a modification of the communication device according to the second embodiment. Figure

Portions that overlap with 13 are given the same reference numerals. As shown in FIG. 19, the communication device of this modification includes a surge absorber 22 provided between the common mode choke coil 21a and the fuse 282 and functioning as an example of a second surge absorbing element. .

[0120] The surge absorber 22 can protect the common mode choke coil 21a against surge while reducing the common mode current.

[0121] It should be noted that as the surge-absorber 22, it is preferable to use a glass tube type surge-absorber that is at least smaller than the capacitance value of the surge-absorber 281, for example, a small capacitance value of about 10 [pF]. As a result, the influence of the common mode choke coil 21a on the reduction effect of the common mode current caused by installing the common mode choke coil 21a in front of the surge absorber 281 with reference to the power connector 102 can be reduced. In the example shown in FIG. A capacitor may be used in place of the surge absorber 281.

[0122] In the description of the second embodiment, the case where the impedance upper 290 having a balanced inductance characteristic is used as the impedance upper has been described. However, the amplifier described in the first embodiment is used. An impedance amplifier 291 having a balanced inductance may be used.

FIG. 20 is a diagram showing frequency common mode current characteristics when an impedance amplifier having an unbalanced inductance is used in the communication device according to the second embodiment. In FIG. 20, the characteristic C231 is a characteristic when the impedance upper 291 as shown in FIG. 5 is connected and the common mode choke coil 21a is not connected. The characteristic C232 is the impedance upper 290 in FIG. This is a characteristic when impedance impedance 291 is connected instead of.

As shown in FIG. 20, it can be seen that the common mode current is reduced by connecting the common mode choke coil 21a. Therefore, in addition to the effect of reducing the level difference of the common mode current caused by the power plug insertion direction and the effect of suppressing the peak value of the common mode current by using the impedance amplifier 291 having an unbalanced inductance, The common mode current can be suppressed.

[0125] According to the second embodiment, the common portion between the surge-absorber 281 and the fuse 282 in the portion corresponding to the power supply device (for example, the portion from the power plug 500 to the switching power supply 300 via the branch portion 299). By connecting the mode choke coil 21a, it is possible to reduce the common mode current in the common mode choke coil 21a while protecting the circuit on the side opposite to the power line connecting portion in the surge absorber 281 against a surge.

[0126] (Third embodiment)

FIG. 21 is a configuration diagram illustrating a part of the first example of the communication device according to the third embodiment, and FIG. 22 is a configuration illustrating a part of the second example of the communication device according to the third embodiment. FIG. In FIG. 21 and FIG. 22, parts that are the same as those in FIG. 4 or FIG.

As shown in FIG. 21, the communication device of the first example is connected between coupling capacitors 272a and 272b and a force plastic transformer 271 and functions as a third common mode choke coil. A common mode choke coil 31 is provided.

[0128] In detail, the force plastic transformer 271 has a primary winding 271a and a secondary winding 271b. The secondary winding 271b is connected to the transmission unit 1 that outputs a transmission signal. Further, the primary winding 271a is connected to the branch portion and superimposes the transmission signal on the power line 900.

[0129] Capacitors 272a and 272b are connected to the primary spring 271a of the force balance 271 and have a higher impedance in the frequency band of the AC voltage depending on the frequency band of the transmission signal. Functions as an example. The coupling capacitors 272a and 272b separate the high-frequency power line communication signal from the signal flowing through the power line 900.

Also, as shown in FIG. 22, the communication device of the second example is connected between the transmission unit 1 and the secondary winding 271b of the force plastic transformer 271 as a third common mode choke coil. A functioning common mode choke coil 31 is provided.

FIG. 23 is a diagram showing frequency common mode current characteristics of the communication device according to the third embodiment. In FIG. 23, the characteristic C301 is a characteristic when the impedance upper 290 as shown in FIG. 4 is connected and the common mode choke coil 31 or 32 is not connected. The characteristic C302 is shown in FIGS. This is the characteristic when the common mode choke coil 31 or 32 as shown is connected.

[0132] As shown in Fig. 23, it can be seen that the common mode current is reduced by connecting the common mode choke coil 31 or 32, particularly in the high band of 15 [MHz] or higher.

When the power supply of the communication device needs to handle a large current, a large current needs to flow through the power supply system extending from the power connector 102 to the switching power supply 300 via the branch part 299. In order to reduce the common mode current by inserting the common mode choke coil into such a power supply system, it is necessary to enlarge the common mode choke coil. Therefore, it is difficult to use a common mode choke coil with sufficient common mode impedance.

Therefore, as shown in FIGS. 21 and 22, the communication device of the third embodiment is configured such that the common mode choke coils 31 and 32 have coupling couplings that cut off signals in the frequency band of the AC voltage. From the capacitors 272a and 272b, they are arranged in the signal system on the rear stage when viewed from the branch 299. Therefore, even when the power supply device handles a large current, it is possible to use a common mode choke coil having a large common mode impedance without increasing the size of the common mode choke coil, and the common mode current can be further reduced.

[0135] In the description of the third embodiment, the case where the impedance upper 290 having a balanced inductance characteristic is used as the impedance upper has been described. However, the amplifier described in the first embodiment is used. An impedance amplifier 291 having a balanced inductance may be used.

FIG. 24 is a diagram showing frequency common mode current characteristics when an impedance amplifier having an unbalanced inductance is used in the communication device according to the third embodiment. In FIG. 24, the characteristic C231 is the characteristic when the impedance amplifier 291 as shown in FIG. 5 is connected and the common mode choke coil 31 or 32 is not connected. The characteristic C312 is the characteristic C312 in FIG. This is a characteristic when the impedance amplifier 291 is connected instead of the impedance amplifier 290.

As shown in FIG. 24, it can be seen that the common mode current is reduced by connecting the common mode choke coil 31 or 32. Therefore, in addition to the effect of reducing the common mode current level difference caused by the power plug insertion direction and the suppression of the peak value of the common mode current by using the impedance amplifier 291 having an unbalanced inductance, The common mode current can be suppressed.

[0138] According to the third embodiment of the present invention, the common mode current can be reduced even if the power supply is in a power line communication device that handles a large current.

[0139] (Fourth Embodiment)

FIG. 25 is an explanatory diagram showing a power cable according to the fourth embodiment. As shown in FIG. 25, the power cable 601 has a pair of electric wires 4 1 and 42 connected to each of the transmission lines of the power line 900. And these electric wires 41 and 42 are twisted. This improves the balance in the power cable 601 and reduces the common mode current.

FIG. 26 shows a power supply cable according to the fourth embodiment of the present invention in a communication apparatus according to the second embodiment. It is a figure which shows the frequency common mode current characteristic when one bull is used. In FIG. 26, a characteristic C401 is a characteristic when the power supply Cape 600, which is a parallel cable, is connected to the communication apparatus shown in FIG. 13, and a characteristic C402 is a characteristic when the power cable 601 is connected to the communication apparatus shown in FIG. It is a characteristic in the case of. As shown in FIG. 26, it can be seen that the common mode current is reduced by connecting the power cable 601 in the form of a stranded wire to the power connector 102.

[0141] FIG. 27 is a diagram showing frequency common mode current characteristics when an impedance upper having an unbalanced inductance and a power cable according to the fourth embodiment are used in the communication device according to the second embodiment. It is. In FIG. 27, the characteristic C232 is a characteristic when the power cable 600, which is a parallel cable, is connected to the communication device to which the impedance upper 291 is connected instead of the impedance upper 290 in FIG. 13, and the characteristic C412 These are characteristics when a stranded wire-shaped power cable 601 is connected to a communication apparatus to which the impedance upper 291 is connected instead of the impedance upper 290.

As shown in FIG. 27, it can be seen that the common mode current is reduced by connecting the stranded wire-shaped power cable 601. Therefore, in addition to the effect of reducing the level difference of the common mode current due to the insertion direction of the power plug and the suppression of the peak value of the common mode current by using the impedance amplifier 291 having an unbalanced inductance, The mode current can be suppressed.

[0143] According to such a fourth embodiment, the use of a power cable having a stranded wire makes it possible to improve the balance and reduce the common mode current.

[0144] Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. It is.

This application is based on Japanese Patent Application No. 2006-215726 filed on Aug. 8, 2006, the contents of which are incorporated herein by reference.

Industrial applicability

The power supply device and power line communication device of the present invention suppress the peak value of common mode current. It is useful for a power line communication system using a short wave band.

Claims

The scope of the claims

[1] A power line connection section that can be connected to a power line that has at least two transmission lines and transmits power; and

A power supply unit that receives supply of the power via the power line connection unit;

An inductor unit provided between the power line connection unit and the power supply unit, the inductor unit,

A first path having a first inductance and connected to one of the transmission lines and a transmission having a second inductance different from the first inductance and connected to the first path And a second path connected to a transmission line different from the line.

[2] The power supply device according to claim 1,

The inductor section includes a first inductor having the first inductance provided in the first path and a second inductor having the second inductance provided in the second path. Power supply provided.

[3] The power supply device according to claim 2,

The first inductor is a power supply device having a third inductor and a fourth inductor having a predetermined inductance.

[4] The power supply device according to claim 1,

The inductor section includes a first coil section provided in the first path, and a second coil section inserted in the second path and having a different number of turns from the first coil section. A power supply device comprising a common mode choke coin.

[5] The power supply device according to claim 1,

The inductor section is

A common mode choke coil provided in each of the first path and the second path and having a coil portion with the same number of turns;

An inductor provided on either one of the first path and the second path.

[6] The power supply device according to claim 1! /, 5! /,

The inductor unit is a power supply device having a characteristic of attenuating signals in a frequency band excluding at least an AC power supply frequency.

[7] The power supply apparatus according to claim 1! /, 6! /,

A fuse connected to the power line connection;

A first surge absorbing element connected to the inductor portion;

And a second common mode choke coil connected between the fuse and the first surge absorbing element.

[8] The power supply device according to claim 7,

The second common mode choke coil is a power supply device having a self-resonant frequency of 20 megahertz or more.

[9] The power supply device according to claim 7 or 8,

A power supply apparatus further comprising a second surge absorbing element provided between the fuse and the second common mode choke coil and having a capacity smaller than that of the first surge absorbing element.

[10] A power supply device according to claim 1 or 9! /,

The power supply unit includes a power cable in which at least two electric wires connected to each of the transmission lines are twisted.

[11] A power line communication device comprising the power supply device according to any one of claims 1 to 10.

[12] The power line communication device according to claim 11,

A transmission unit that outputs a transmission signal to be transmitted through the power line;

A force plug having a secondary winding connected to the transmission unit and a primary winding connected to a branch portion between the power line connection unit and the inductor unit to superimpose the transmission signal on the power line. With a transformer

A capacitor part connected to a primary winding of the force plastic transformer, and having a higher impedance in the frequency band of the AC voltage depending on the frequency band of the transmission signal, and connected between the capacitor part and the transmission part A power line communication device further comprising a third common mode choke coil.

[13] The power line communication device according to claim 12,

The third common mode choke coil is a power line communication device connected between the capacitor unit and a primary winding of the force plastic transformer.

[14] The power line communication device according to claim 12,

The third common mode choke coil is a power line communication device connected between the transmitter and a secondary winding of the force plastic transformer.

[15] The power supply device according to claim 1,

The power supply apparatus according to claim 1, wherein a ratio of the second inductance to the first inductance is 1.2;

[16] The power supply device according to claim 15,

The power supply apparatus according to claim 1, wherein a ratio of the second inductance to the first inductance is 1.3 to 2.