JP2010278942A - Splitter for plc with balun transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a splitter for PLC (Power Line Communication) with a balun transformer which has the same function as a conventional noise filter with a coupling circuit, makes a communication by separating a PLC signal superimposed on a high-speed signal such as a television signal of a coaxial line and the high-speed signal from each other, and is applicable to an electric appliance with a built-in communication modem for PLC. <P>SOLUTION: The splitter for PLC with a balun transformer is composed of: a power line input terminal 1; a coupling circuit 3 and a noise filter circuit 4 connected in parallel to the power line input terminal for passing a power line carrier signal; an output terminal 9 of the coupling circuit 3 and an output terminal 10 of the noise filter circuit 4; a coaxial line input terminal 2; a splitter circuit for PLC comprised of a low-pass filter circuit 7 and a high-pass filter circuit 8 connected in parallel to the coaxial line input terminal 2, respectively; a balun transformer 6 connected to an output side of the low-pass filter circuit 7; and a coaxial line output terminal connected to an output side of the high-pass filter circuit 8, wherein an output of the balun transformer 6 is connected to the output terminal 9. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wiring device used for power line carrier communication that enables power supply and transmission / reception of a data signal using an indoor power line used in a general house and the like, and is particularly configured to simultaneously use a coaxial line. Further, the present invention relates to a PLC splitter with a balun transformer.

  The spread of the Internet in recent years has been remarkable, and the importance of an environment for accessing the Internet is increasing even at home, and power line communication, that is, PLC (Power Line Communication), has attracted attention as means for simplifying the access. The line can be connected simply by plugging into an AC power line outlet, which is an existing indoor wiring, so the PC can be connected to the Internet without any new wiring work, and a home network for connecting electrical equipment can be easily constructed. become. The use of the 2 MHz to 30 MHz band for the PLC communication speed is also permitted, and a large amount of information can be communicated.

  When using a PLC, a PLC communication modem is mainly connected to the AC power line, and then connected to a personal computer or the like to perform communication. However, a PLC communication circuit is provided inside an electric device such as a personal computer or a television. An electrical device that does not require a built-in external PLC communication modem has also been realized. As described above, if each electrical device includes a PLC communication modem, communication between these devices can be performed with a simpler configuration, and various information exchange and mutual control are facilitated. In particular, services and devices that can access the Internet from televisions have also become widespread.

  Conventionally, an inlet type noise filter is shown in Patent Document 1 as a wiring device incorporating a power supply noise filter and a PLC coupling circuit for incorporating a PLC communication modem in a television or the like. On the other hand, Patent Document 2 discloses an external PLC adapter built-in type splitter for simultaneously communicating a power line carrier signal and a coaxial carrier signal.

JP 2008-283244 A JP 2009-55404 A

  The indoor power line of a general household is wired with a single-phase three-wire 100V, the middle line is grounded, and different phases are wired in each room even in one house. When communicating with a PLC communication modem, communication between rooms with different phases (inter-phase communication) tends to reduce the signal compared to communication between rooms with the same phase (inter-phase communication). Communication may not be possible on power lines.

  FIG. 3 is a diagram showing an example of a configuration of indoor wiring when a PLC communication modem, a conventional noise filter with a coupling circuit, and a television with a built-in PLC communication modem are arranged on different power lines in a general household. . FIG. 1 shows a case in which a signal such as the Internet that is captured from the outside with a wired cable or antenna is captured by a modem 11 that supports light, ADSL, or wireless, and the PLC is used as a means for connecting it to an indoor LAN. ing. Moreover, the case where the television 40 with a built-in PLC modem 21 in which the PLC modem 21 is built in the room where the PLC modem 20 which is the PLC communication modem is placed and the room where the power line is different is shown. Furthermore, the case where the inlet type noise filter 41 which has the function of the noise filter with a coupling circuit shown by patent document 1 is applied to the input part of the power line of this television 40 with a built-in PLC modem is shown.

  The inlet type noise filter 41 is connected to the power line input terminal 1, the coupling circuit 3 that passes through the power line carrier signal connected in parallel to the power line input terminal 1, the noise filter circuit 4 that blocks power supply noise, and the PLC modem 21. Modem having an output terminal 9 of the coupling circuit 3 and an output terminal 10 of the noise filter circuit 4 connected to the power supply circuit 22, and the coupling circuit 3 insulates and isolates the high-pass filter from the power supply line. It consists of a transformer.

  Here, assuming that the phases of the three-phase power line with respect to the ground line are L1 and L2, the PLC signal in the in-phase power line is between the same L1 and GND, so communication is possible without any problem. However, when PLC signals are communicated between rooms where different-phase power lines are wired (between different phases), communication is difficult because signals are significantly reduced in different-phase communication using power lines between L1-GND and L2-GND. There are cases. In this case, the PLC modem built-in television 40 placed in a room different from the room where the PLC modem 20 is placed cannot connect to the Internet.

  On the other hand, even when a PLC is used as means for connecting to an indoor LAN, generally, a high-speed signal such as a TV signal is low in noise and has good signal quality as shown in FIG. It is often wired to each room using. Therefore, it is conceivable that the PLC signal is superimposed on a coaxial television (TV) signal and the like is used for communication. However, the conventional noise filter with a coupling circuit as shown in FIG. 3 cannot receive the PLC signal superimposed on the coaxial television signal.

  Note that if a conventional splitter with a built-in PLC adapter shown in Patent Document 2 is used separately and externally, PLC signals can be communicated with both a coaxial line and a power line, but this is applied to a television with a built-in PLC modem as it is. Therefore, if this splitter is used externally, the apparatus becomes larger and the cost increases.

  Therefore, the problem of the present invention is that it has the same function as a conventional noise filter with a coupling circuit, and can communicate by separating a PLC signal superimposed on a high-speed signal such as a coaxial television signal and the high-speed signal, An object of the present invention is to provide a PLC splitter with a balun transformer that can be applied to electric devices with a built-in PLC communication modem.

  In order to solve the above problems, a PLC for balun transformer with a balun transformer according to the present invention includes a power line input terminal, a coupling circuit that passes through a power line carrier signal connected in parallel to the power line input terminal, and noise for removing power supply noise. Filter circuit, output terminal of coupling circuit and output terminal of noise filter circuit, coaxial line input terminal, and low-pass filter circuit and high-pass filter circuit respectively connected in parallel to coaxial line input terminal A PLC splitter circuit, a balun transformer connected to the output side of the low-pass filter circuit, and a coaxial line output terminal connected to the output side of the high-pass filter circuit. The output is connected to the output terminal of the coupling circuit.

  Here, the coupling circuit may include a high-pass filter and a modem transformer, and the high-pass filter of the coupling circuit may include a capacitor element. The coupling circuit may be a coupling circuit that passes a power line carrier signal of 2 MHz to 30 MHz.

  The low-pass filter circuit may include a coil element and a capacitor element, and the high-pass filter circuit may include a coil element and a capacitor element.

  The coupling circuit, the noise filter circuit, the PLC splitter circuit, and the balun transformer may be housed in a single box-shaped housing, and the power line input terminal and the coaxial line input terminal are It may be installed on one surface of the housing, and the output terminal of the coupling circuit, the output terminal of the noise filter circuit, and the coaxial line output terminal may be installed on the other surface of the housing.

  With the above configuration, the PLC splitter with a balun transformer according to the present invention includes a coaxial line input terminal and a low-pass filter circuit connected in parallel to the coaxial line input terminal in addition to the conventional noise filter with a coupling circuit. And a PLC splitter circuit composed of a high-pass filter circuit, a balun transformer, and a coaxial line output terminal, thereby having a balanced-unbalanced conversion function and having a coaxial line and a built-in PLC communication. It has a function that allows direct connection to a modem.

  As a result, it has the function of a conventional noise filter with a coupling circuit, and can communicate by separating a PLC signal superimposed on a high-speed signal such as a coaxial television signal and a high-speed signal, and has a built-in PLC communication modem. PLC splitter with balun transformer that can be applied to a type of electrical equipment is obtained.

The figure which shows the circuit structure of one Embodiment of the splitter for PLCs with a balun transformer by this invention. The figure which shows an example of a structure of an indoor wiring at the time of arrange | positioning the PLC communication modem, the splitter for PLCs with a balun transformer of this Embodiment, and the television incorporating the PLC communication modem to the power line from which a phase differs. The figure which shows an example of a structure of indoor wiring at the time of arrange | positioning the communication modem for PLC, the conventional noise filter with a coupling circuit, and the television incorporating the communication modem for PLC to the power line from which a phase differs.

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

  FIG. 1 is a diagram showing a circuit configuration of an embodiment of a PLC splitter with a balun transformer according to the present invention, and is a diagram showing a television incorporating a PLC splitter with a balun transformer and a PLC communication modem according to this embodiment. is there. In FIG. 1, the PLC splitter 25 with balun transformer of this embodiment removes the power line input terminal 1 and the coupling circuit 3 that passes the power line carrier signal connected in parallel to the power line input terminal 1 and the power line input terminal 1, respectively, and power noise. Noise filter circuit 4, output terminal 9 of coupling circuit 3, output terminal 10 of noise filter circuit 4, coaxial line input terminal 2, and low-pass filter circuit connected in parallel to coaxial line input terminal 2, respectively (LPF) 7 and a PLC splitter circuit comprising a high-pass filter circuit (HPF) 8, a balun transformer 6 connected to the output side of the low-pass filter circuit 7, and an output side of the high-pass filter circuit 8 The output of the balun transformer 6 is connected to the output terminal 9 of the coupling circuit 3. In the television 30 with a built-in PLC modem, the output terminal 9 of the coupling circuit 3 is connected to the PLC modem 21, the output terminal 10 of the noise filter circuit 4 is connected to the power circuit 22, and the coaxial line output terminal is connected to the TV circuit 23. .

  The coupling circuit 3 includes a high-pass filter and a modem transformer 14, and the high-pass filter of the coupling circuit 3 includes a capacitor element 13. The coupling circuit 3 is a coupling circuit that passes a power line carrier signal of 2 MHz to 30 MHz. The noise filter circuit 4 is configured by combining a common mode choke coil, a coil element 15 and a capacitor element 16.

  The low-pass filter circuit 7 has a coil element and a capacitor element, and the inductance of the coil element and the capacitance of the capacitor element are determined so as to pass a power line carrier signal of 2 MHz to 30 MHz. The high-pass filter circuit 8 includes a coil element and a capacitor element, and the inductance of the coil element and the capacitance of the capacitor element are determined so as to pass the TV signal. The balun transformer 6 is composed of a general signal conversion element having a conversion function between an unbalanced circuit and a balanced circuit.

  Further, the coupling circuit 3, the noise filter circuit 4, the low-pass filter circuit 7, the high-pass filter circuit 8 and the balun transformer 6 are housed in a single box-like casing, and are coaxial with the power line input terminal 1. The input terminal 2 is installed on one surface of the housing, and the output terminal 9 of the coupling circuit 3, the output terminal 10 of the noise filter circuit 4, and the coaxial line output terminal are installed on the other surface of the housing.

  In the PLC splitter 25 with balun transformer of the present embodiment, the PLC signal superimposed on the TV signal is input from the coaxial line input terminal 2 and cut off by the high-pass filter circuit 8, but the low-pass filter circuit 7 and the balun transformer 6 are transmitted to the PLC modem 21 built in the television 30 with a built-in PLC modem, and the PLC signal from the PLC modem 21 is also output from the coaxial line input terminal 2 to the coaxial line through the same path in the reverse direction. The The television signal input from the coaxial line input terminal 2 is blocked by the low-pass filter circuit 7 but passes through the high-pass filter circuit 8 and is transmitted from the coaxial line output terminal to the TV circuit 23.

  FIG. 2 is a diagram showing an example of a configuration of indoor wiring when a PLC communication modem, a PLC splitter with a balun transformer of the present embodiment, and a television incorporating the PLC communication modem are arranged on different power lines. Yes, except for the television 30 with a built-in PLC modem, the wiring is the same as in FIG.

  In FIG. 2, the PLC signal generated by the PLC modem 20 and superimposed on the coaxial TV signal is input to the coaxial line input terminal 2 of the PLC splitter 25 with a balun transformer of this embodiment built in the television 30 with a built-in PLC modem. By transmitting the signal to the PLC modem 21 via the low-pass filter circuit 7 and the balun transformer 6, the television 30 with a built-in PLC modem is connected to the Internet or the like and can communicate.

  As described above, the PLC splitter with balun transformer according to the present embodiment is mounted not only on the power line but also on the high-speed signal on the coaxial line by mounting it on an electric device such as a television with a built-in PLC communication modem. The PLC signal can be received and communicated via a coaxial line. In addition, the PLC splitter with a balun transformer according to the present embodiment has a coupling circuit, a noise filter circuit for power supply, a splitter circuit for PLC, and a balun transformer integrated into a compact configuration suitable for packaging. Yes, it can be easily incorporated into electrical equipment that requires a PLC signal.

  Needless to say, the present invention is not limited to the above embodiment, and the circuit configurations of the coupling circuit, the noise filter circuit, the high-pass filter circuit, the low-pass filter circuit, and the balun transformer are not limited to those described above. Any circuit element can be used as long as the object of the invention can be achieved. For example, general circuit elements other than capacitor elements and coil elements can be used. In addition, the circuit configuration and the elements to be used can be optimized according to the type of signal, the frequency band, and the like. The shape of the case of the splitter for PLC with balun transformer of the present invention can be designed according to the built-in electric equipment, and can be applied to the circuit board as it is without being housed in the case.

DESCRIPTION OF SYMBOLS 1 Power line input terminal 2 Coaxial line input terminal 3 Coupling circuit 4 Noise filter circuit 6 Balun transformer 7 Low-pass filter circuit 8 High-pass filter circuit 9, 10 Output terminal 11 Modem 13, 16 Capacitor element 14 Modem transformer 15 Coil element 20, 21 PLC modem 22 Power supply circuit 23 TV circuit 25 Splitter for PLC with balun transformer 30, 40 PLC modem built-in television 41 Inlet type noise filter

Claims (8)

  A power line input terminal; a coupling circuit that passes through a power line carrier signal connected to the power line input terminal in parallel; a noise filter circuit that removes power supply noise; an output terminal of the coupling circuit; and an output of the noise filter circuit A PLC splitter circuit comprising a terminal, a coaxial line input terminal, a low-pass filter circuit and a high-pass filter circuit connected in parallel to the coaxial line input terminal, and an output side of the low-pass filter circuit It comprises a connected balun transformer and a coaxial line output terminal connected to the output side of the high-pass filter circuit, and the output of the balun transformer is connected to the output terminal of the coupling circuit. Splitter for PLC with balun transformer.   2. The PLC splitter with balun transformer according to claim 1, wherein the coupling circuit includes a high-pass filter and a modem transformer.   The PLC splitter with a balun transformer according to claim 2, wherein the high-pass filter of the coupling circuit comprises a capacitor element.   4. The PLC splitter with a balun transformer according to claim 1, wherein the coupling circuit is a coupling circuit that passes a power line carrier signal of 2 MHz to 30 MHz. 5.   The PLC for a balun transformer according to any one of claims 1 to 4, wherein the low-pass filter circuit includes a coil element and a capacitor element.   The PLC for balun transformer with PLC according to any one of claims 1 to 5, wherein the high-pass filter circuit includes a coil element and a capacitor element.   The said coupling circuit, the said noise filter circuit, the said splitter circuit for PLC, and the said balun transformer are accommodated in one box-shaped housing | casing, The any one of Claims 1-6 characterized by the above-mentioned. Splitter for PLC with balun transformer.   The power line input terminal and the coaxial line input terminal are installed on one side of the casing, and the output terminal of the coupling circuit, the output terminal of the noise filter circuit, and the coaxial line output terminal are on the other side of the casing. The splitter for PLC with a balun transformer according to claim 7, wherein the splitter is for a PLC.

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