Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B3/00—Line transmission systems
  • H04B3/54—Systems for transmission via power distribution lines
  • H04B3/56—Circuits for coupling, blocking, or by-passing of signals

Definitions

• the present invention relates to a termination device provided at the termination of indoor power wiring used for power line carrier communication.
• Power line carrier communication is performed using a power line that supplies commercial power as a transmission line, and is normally performed by balanced transmission using two lines.
• a communication device is connected via a modem to a power supply outlet to which two or three power wires are connected, and transmission / reception is performed between the communication devices connected to the outlet.
• an indoor power line is not originally laid as a communication line, it is not always an environment suitable for communication.
• the branching portion of the power wiring including the outlet becomes a so-called open stub state, which adversely affects communication quality. That is, since the outlet becomes an open end (high impedance), the input impedance characteristic of the power line to which a predetermined load is connected becomes unstable with respect to the frequency. As a result, high-frequency signals are reflected, which degrades communication signals.
• Patent Document 1 communication signals are reflected and attenuated by connecting a termination circuit having an impedance corresponding to the impedance between power lines in the frequency band used for power line carrier communication to an outlet of an indoor power wiring. Techniques to avoid are described. However, the outlet to which this terminal device is connected becomes unusable, and a decrease in usable outlets is inevitable.
• Patent Documents 2 and 3 describe a termination device connected to an indoor power wiring outlet and further having a plug to which an electrical device can be connected. But these When an electrical device (modem or the like) that performs power line carrier communication is connected to this terminal device, the communication signal of the power line carrier communication is absorbed by the termination circuit, and the communication efficiency is lowered. Also, even if a modem or the like is connected to the same (or close) outlet to which these terminators are connected, communication signals will be absorbed and a reduction in communication efficiency is inevitable.
• an electrical device modem or the like
• Patent Document 1 Japanese Patent Laid-Open No. 2003-264486
• Patent Document 2 Japanese Patent Laid-Open No. 2003-283387
• Patent Document 3 Japanese Patent Laid-Open No. 2004-304365
• the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a termination device capable of power line carrier communication in which deterioration of communication quality is suppressed without reducing communication efficiency. Means to do
• the termination device of the present invention is a termination device provided at a termination of an indoor power wiring having a pair of power lines that can be used for power line carrier communication, and includes a termination circuit unit having a predetermined impedance, and the termination circuit A switching unit that switches connection of the unit, and the termination circuit unit is connected between the pair of power lines via the switching unit.
• the present invention it is possible to perform power line carrier communication in which deterioration of communication quality is suppressed without reducing communication efficiency.
• the communication device that performs power line carrier communication When the communication device that performs power line carrier communication is not connected to the terminal end, connect the terminal circuit section to the power line, and when communication equipment is connected, switch the terminal circuit section to disconnect the power line force.
• the input impedance characteristic of the power line to which a predetermined load is connected can be stabilized with respect to the frequency.
• the communication efficiency of the connected communication device is not lowered, and the deterioration of the communication quality due to the impedance variation of the power line can be suppressed.
• the termination device of the present invention includes the termination circuit unit in which the termination circuit unit is a resistance element.
• the termination device of the present invention includes the termination circuit unit in which the termination circuit unit is a variable resistance element.
• the termination circuit section includes a series circuit of a resistance element and a capacitance element. Including those that are
• the termination device of the present invention includes the termination circuit section in which the impedance can be changed.
• the termination device of the present invention includes a termination device in which the termination circuit units are arranged in parallel and selectively use a plurality of circuit elements having different impedances.
• the termination device of the present invention includes a termination device in which the termination circuit unit and the switching unit are connected to a power supply side conductor of a power outlet of the indoor power wiring.
• the termination device of the present invention further includes a power plug inserted into a power outlet of the indoor power wiring, and the termination circuit unit is connected between the two terminals of the power plug via the switching unit. Including those connected to.
• the termination device of the present invention further includes at least one power jack, and the power jack is connected to the power supply bracket when at least the termination circuit unit is disconnected from the power line. including.
• the termination device of the present invention further includes an impedance adjustment unit connected to the power line, and the impedance adjustment unit has a high impedance in a use frequency band of the power line carrier communication, Including one connected to the power supply side opposite to the power line from the connection part of the termination circuit part.
• the switching unit when an electrical device is connected via the impedance adjustment unit, the switching unit prevents the so-called short stub state by connecting the termination circuit unit to the power line. , Can prevent reflection of high-frequency signals.
• the termination device of the present invention further includes a short-circuit switch that short-circuits the impedance adjustment unit, the short-circuit switch operates in conjunction with the switching unit, and the termination circuit unit is disconnected from the power line force. Including the one that short-circuits the impedance adjuster when
• the switching unit disconnects the termination circuit unit from the power line force and shorts the impedance adjustment unit, so that the communication signal is not attenuated. A decrease in communication efficiency can be avoided.
• the terminator of the present invention is further connected to the power line via the impedance adjusting unit. And a first power supply terminal to be connected and a second power supply terminal to be connected to the power line when at least the termination circuit unit is disconnected from the power line.
• the present invention it is possible to prevent the communication signal from being attenuated by connecting the communication device to the second power supply terminal and disconnecting the termination circuit unit. At this time, even if an electrical device is connected to the first power supply terminal, since the impedance adjustment unit is high impedance for the communication signal, a high-frequency communication signal is not transmitted to the connected electrical device, and the communication quality is low. Deterioration can be prevented. In addition, when no device is connected to the second power supply terminal and an electrical device is connected to the first power supply terminal, the terminal circuit portion is connected to the power line, so that a so-called short stub state is obtained. This prevents the reflection of high frequency signals.
• the termination device of the present invention includes the termination circuit unit, the switching unit, and the impedance adjustment unit that are connected to a power supply side conductor of a power outlet of the indoor power wiring.
• the termination circuit section, the switching section, and the impedance adjustment section are connected to a power supply side conductor of a power outlet of the indoor power wiring, and the first power supply terminal is 1 power jack of the power outlet, and the second power supply terminal force including another power jack of the power outlet.
• the termination device of the present invention further includes a power plug inserted into a power outlet of the indoor power wiring, and a power jack connected to the power plug via the impedance adjusting unit,
• the termination circuit unit includes one connected between two terminals of the power plug via the switching unit.
• the termination device of the present invention further includes a power plug inserted into a power outlet of the indoor power wiring, a first power jack as the first power supply terminal, and the second power supply.
• a second power jack as a power supply terminal, the termination circuit section being connected between two terminals of the power plug via the switching section, and the first power jack being the impedance. It includes one that is connected to the power plug through an adjustment unit.
• the termination device of the present invention includes the power plug, the termination circuit unit, the switching unit, and the front
• the second power jack is housed in a first housing, the impedance adjusting section, and the first power jack is housed in a second housing, and the power plug and the impedance adjusting section are connected to each other. Includes those with a power cord to connect.
• the termination circuit unit, the switching unit, the impedance adjustment unit, the first power jack, and the second power jack are housed in one housing, and the power source Includes a power cord that connects the plug and the impedance adjuster.
• the termination device of the present invention further includes a power supply terminal connected to the power line when at least the termination circuit unit is disconnected from the power line, and the power supply terminal performs communication for performing power line carrier communication. Including those connected to the power cord of the device.
• the termination device of the present invention further includes a power plug that is inserted into a power outlet of the indoor power wiring, and a power jack that is the first power supply terminal, and the termination circuit section includes: Connected between two terminals of the power plug through the switching unit, the power jack is connected to the power plug through the impedance adjusting unit, and the second power supply terminal performs power line carrier communication. Including those connected to the power cord of the communication equipment to be used.
• the terminator of the present invention further comprises a power plug inserted into a power outlet of the indoor power wiring, and a power jack connected to the power plug via the impedance adjustment unit,
• the power plug, the termination circuit unit, and the switching unit are housed in a first housing, and the impedance adjustment unit, the short-circuit switch, and the power jack are housed in a second housing, Including a power cord for connecting the power plug and the impedance adjusting unit.
• the termination device of the present invention includes the switching device in which the switching unit disconnects the termination circuit unit from the power line force when the communication device is powered on.
• the termination device of the present invention is a termination device in which the switching unit disconnects the termination circuit unit from the power line when a communication signal line of a communication device that performs power line carrier communication is connected to the termination.
• the switching unit and the power plug of the communication device are connected to the power.
• the switching unit includes a photoelectric switch member that operates when a power plug of the communication device is connected to the power line, and the termination according to the operation of the photoelectric switch member. Including a switch member that separates the circuit unit from the power line.
• FIG. 1 is a diagram showing a schematic configuration of an example of a termination device according to a first embodiment of the present invention.
• FIG. 2 is a diagram illustrating a configuration of a termination circuit unit in the termination device according to the first embodiment of the present invention.
• FIG. 3 is a schematic diagram illustrating another example of the termination device according to the first embodiment of the present invention.
• FIG. 4 is a diagram for explaining the operation of an example of the switching unit in the terminating device according to the first embodiment of the present invention.
• FIG. 5 is a diagram for explaining the operation of an example of the switching unit in the terminating device according to the first embodiment of the present invention.
• FIG. 6 is a diagram for explaining the operation of another example of the switching unit in the terminating device according to the first embodiment of the present invention.
• FIG. 7 is a diagram for explaining the operation of another example of the switching unit in the terminating device according to the first embodiment of the present invention.
• FIG. 8 is a diagram for explaining another example operation of the switching unit in the terminating device according to the first embodiment of the present invention.
• FIG. 9 is a diagram showing a schematic configuration of an example of a termination device according to a second embodiment of the present invention.
• FIG. 10 is a diagram showing a schematic configuration of another example of the termination device according to the second embodiment of the present invention.
• FIG. 11 is a diagram showing a schematic configuration of another example of the termination device according to the second embodiment of the present invention.
• FIG. 12 is a diagram showing a schematic configuration of another example of the termination device according to the second embodiment of the present invention.
• FIG. 13 is a diagram showing a schematic configuration of an example of a termination device according to a third embodiment of the present invention.
• FIG. 14 is a diagram showing a schematic configuration of another example of the termination device according to the third embodiment of the present invention.
• FIG. 15 is a schematic configuration of another example of the termination device according to the third embodiment of the present invention.
• FIG. 16 is a diagram showing a schematic configuration of another example of the termination device according to the third embodiment of the present invention.
• FIG. 17 is a schematic diagram of another example of the termination device according to the third embodiment of the present invention.
• FIG. 18 is a diagram showing a schematic configuration of another example of the termination device according to the third embodiment of the present invention.
• FIG. 19 is a hardware example of the PLC modem according to the third embodiment of the present invention. Block diagram showing symbols
• FIG. 1 shows a schematic configuration of an example of a termination device according to the first embodiment of the present invention.
• the termination device in Fig. 1 is used as an adapter that can be attached to and detached from a power outlet corresponding to the termination of indoor power wiring.
• Power plug terminal lla, lib, termination circuit section 12, switching switch 13, power jack terminal 14a and 14b are housed in an adapter housing 100 schematically shown.
• the indoor power wiring has, for example, a pair of power lines such as a VVF cable and is wired indoors such as a house (for example, an apartment house or a detached house), an office, or a factory.
• the power plug terminals lla and lib are inserted into the power jacks 51a and 51b of the power outlet 50, and the power jacks 51a and 51b are connected to the power lines 52 and 52 (indoor power wiring), respectively.
• the termination circuit unit 12 is connected between the power plug terminals lla and lib via the switching switch 13.
• the switching switch 13 switches the connection of the termination circuit unit 12.
• the power jack terminals 14a and 14b are for power supply to the outside (power supply terminals), and are communication devices that perform power line carrier communications (hereinafter referred to as power supply terminals)
• power supply terminals When simply described as “communication device”, it refers to a communication device that performs power line carrier communication.
• various electrical equipment other than communication devices hereinafter simply referred to as “electrical equipment” refers to various electrical equipment other than communication devices).
• Termination circuit unit 12 has an impedance corresponding to the impedance between the indoor power wirings in the frequency band used for power line carrier communication, and is configured by a series circuit of capacitance element 121 and resistance element 122. Therefore, when the power plug terminals l la and l ib are inserted into the power jacks 51a and 51b of the power outlet 50 and the termination circuit 12 is connected between the power plug terminals l la and l ib, This means that the wiring is terminated at the termination circuit section 12.
• the input impedance characteristic (hereinafter simply referred to as “input impedance”) of the power line to which a predetermined load is connected can be stabilized with respect to the frequency, so that the high-frequency signal used for power line carrier communication can be stabilized. Reflection can be reduced.
• the termination circuit unit 12 is not limited to the series circuit of the capacitance element 121 and the resistance element 122 as shown in FIG. 1, but may be any type as long as it has a predetermined impedance. Further, the impedance of the termination circuit unit 12 does not need to be fixed and may be variable.
• FIG. 2 shows another configuration example of the termination circuit unit 12.
• Fig. 2 (a) uses one resistance element 122
• Fig. 2 (b) uses one variable resistance element 122a
• Fig. 2 (c) shows one variable element.
• the impedance element 123 is used.
• the resistance value of the variable resistance element 122a and the impedance of the variable impedance element 123 may be changed manually or may be changed electrically.
• FIG. 2D shows a case where one terminal element 122 and one impedance element 124 are switched and used by the termination impedance switching switch 125.
• the terminal impedance switching switch 125 may be manually operated, or may be automatically switched according to the use state by providing an appropriate driving means.
• the terminal impedance switching switch 125 can also be used as the switching switch 13!
• the termination circuit of FIG. 1 is used as a switching switch 13 to switch between the power plug terminal 11a and the power jack terminal 14a when the termination circuit unit 12 is connected between the power plug terminals 11a and 1 lb.
• the connection may be made simply by switching the connection state of the termination circuit unit 12 (for example, see FIG. 6 described later).
• a communication device is connected to the power jack terminal.
• the switching switch 13 is operated so as to disconnect the termination circuit unit 12 and the power plug terminals l la and l ib.
• FIG. 1 shows a terminating device applied to an adapter that is attached to and detached from the power outlet 50 or the like, but may be built in the power outlet 50.
• the termination circuit unit 12 and the switching unit 13 are connected to the power supply side conductor (power line) 52 of the power outlet 50 (the configuration is similar to that shown in FIG. 11).
• the terminating device of the first embodiment can also be configured as an adapter connected to the power cord of a communication device that performs power line carrier communication.
• Figure 3 shows the schematic configuration of the termination device connected to the power cord of the communication device. 3 includes a power plug terminal 11a, l ib, a termination circuit section 12, a switching switch 13a, 13b, and a power cord connection section (power supply terminal) 21.
• the adapter housing 100 schematically shown in FIG. It is stored in.
• the power plug terminals l la and l ib are inserted into the power jacks 51a and 5 lb of the power outlet 50 shown in FIG. 1, and the power jacks 51a and 51b are connected to the power lines 52 and 52 (indoor power wiring), respectively.
• the termination circuit unit 12 includes a direct circuit of two capacitance elements 121a and 121b and a resistance element 112.
• the switching switches 13a and 13b are used to switch the connection between the power plug terminals lla and lib and the termination circuit section 12.
• a power line carrier communication modem (hereinafter referred to as a PLC modem) 90 which is a type of communication device, is connected to the power cord connector 21 and connected to a power plug terminal via the switching switches 13a and 13b. Connected to l la and l ib.
• any one including the one shown in FIG. 2 in addition to the one shown in FIG. 3 can be adopted.
• the configuration of the switching switches 13a and 13b can be appropriately changed to one having a predetermined impedance as in the case of the termination device of FIG.
• the communication device is not limited to a communication device such as a modem alone, but also includes electrical equipment with a built-in modem.
• the specific configuration and switching operation of the switching switch will be described with reference to Figs. 4 to 8, the power plug 92 connected to the power cord 92 of the communication device or the like is connected to the power jack terminals 14a and 14b of the terminator as shown in FIG. 1 and the jack of the power outlet incorporating the terminator.
• the power supply conductors 101a and 101b are conductors connected to the power plug terminals l la and l ib of the termination device as shown in FIG. 1 or the power supply side conductors of the power outlets.
• . 4 to 8 are diagrams for explaining the switching operation, and therefore the configuration of the power jack is shown schematically or omitted.
• FIG. 4 shows an example of mechanically switching the connection of the termination circuit portion by inserting the power plug terminals 91a and 91b of the power plug 91.
• the terminating device of FIG. 4 is provided with movable conductors 13ax and 13bx of the switching switch at the inlets of the power plug terminals 91a and 91b.
• the movable conductors 13ax and 13bx are rotatable about one end, and before insertion of the power plug terminals 91a and 91b, as shown in FIG.
• the capacitor 121 and the resistor 122 are connected to the power supply conductors 101a and 101b.
• the movable conductors 13ax and 13bx rotate to disconnect the capacitive element 121 and the resistive element from the power supply conductors 101a and 101b. Release.
• FIG. 5 shows another example of mechanically switching the connection of the termination circuit portion by inserting the power plug terminals 91a and 91b of the power plug 91.
• the movable conductors 13ax and 13bx of the switching switch can be rotated around the center, and when the power plug terminals 91a and 91b are inserted, the power plug terminals 91a and 91b and the power supply conductor
• the structure is almost the same as that of Fig. 4 except that the connection to 101a and 101b is made via movable conductors 13ax and 13bx.
• the capacitive element 121 and the resistive element 122 constituting the termination circuit section are connected to the power supply conductors 101a and 10 lb. It is in this state.
• the movable conductors 13ax and 13bx rotate to connect the capacitive element 121 and the resistance element to the power supply conductors 10la and 101b. Connect the power plug terminals 91a and 91b to the power supply conductors 101a and 10 lb.
• FIG. 5 (a) Before inserting the power plug terminals 91a and 91b, as shown in FIG. 5 (a), the capacitive element 121 and the resistive element 122 constituting the termination circuit section are connected to the power supply conductors 101a and 10 lb. It is in this state.
• the movable conductors 13ax and 13bx rotate to connect the capacitive element 121 and the resistance element to the power supply conductors 10la and 101b. Connect the power plug terminals 91a and 91b to the power supply conductors 101
• FIG. 6 shows an example in which the connection of the termination circuit portion is switched photoelectrically by inserting the power plug terminals 91 a and 91 b of the power plug 91.
• the light emitting unit 31 and the light receiving unit 32 are arranged near the insertion port of the power plug terminals 91a and 91b so as to sandwich the power plug terminals 91a and 91b to be inserted.
• a switch 13 that operates in accordance with the state of 32 is provided between the capacitance element 121, the resistance element 122, and the power supply conductors 101a and 1Olb that constitute the termination circuit section.
• Examples of the light emitting unit 31 include a light emitting diode
• examples of the light receiving unit 32 include a silicon photodiode and a phototransistor.
• FIG. 7 shows another example in which the connection switching of the termination circuit unit is performed photoelectrically by inserting the power plug terminals 91 a and 91 b of the power plug 91.
• the termination device in FIG. 7 has substantially the same configuration as that in FIG. 6 except that the light emitting unit 31 and the light receiving unit 32 are arranged on one side near the insertion port of the power plug terminals 9 la and 9 lb. Have.
• FIG. 8 shows an example of controlling the operation of the relay by inserting the power plug terminals 91a and 91b of the power plug 91 and switching the connection of the termination circuit section.
• the termination device in FIG. 8 has a push switch 33 that is pushed by a power plug terminal 9 la (may be 9 lb) inserted near the insertion port of the power plug terminals 91a and 9 lb.
• 33 A relay 34 controlled according to the state is provided between the capacitance element 121, the resistance element 122, and the power supply conductors 101a and 101b constituting the termination circuit unit.
• the push switch 33 Before the power plug terminals 91a and 91b are inserted, the push switch 33 is in the off state and the relay 34 is in the on state, and as shown in FIG. 8 (a), the capacitance element 121 and the resistance element 122 To the power supply conductors 101a and 101b.
• the push switch 33 When the power plug terminals 91a and 91b are inserted, the push switch 33 is turned on, so that the relay 34 is turned off and the capacitance element 121 and the resistance element 122 are disconnected from the power supply conductors 101a and 101b.
• FIG. 9 shows a schematic configuration of an example of the termination device according to the second embodiment of the present invention.
• the termination device in Fig. 9 is used as an adapter that can be attached to and detached from the power outlet of the indoor power wiring, similar to the termination device in Fig. 1, and includes power plug terminals l la, l ib, termination circuit section 12, and switching switch. 131, power jack terminals 14a and 14b, impedance adjustment unit 15, and short-circuit switches 16a and 16b, which are housed in an adapter housing 100 schematically shown.
• the power plug terminals l la and l ib are inserted into the power jacks 51a and 5 lb of the power outlet 50 shown in FIG. 1, and the power jacks 51a and 51b are connected to the power lines 52 and 52, respectively.
• the termination circuit unit 12 is connected between the power plug terminals l la and l ib via the switching switch 131.
• the switching switch 131 switches the connection of the termination circuit unit 12.
• the power jack terminals 14a and 14b are for signal transmission as well as power supply to the outside, and are connected to power plugs of communication devices and electrical equipment.
• Termination circuit unit 12 has an impedance corresponding to the impedance between the indoor power wirings in the frequency band used for power line carrier communication, and is configured by a series circuit of capacitance element 121 and resistance element 122. Therefore, when the termination circuit unit 12 is connected between the power plug terminals l la and l ib, the indoor power wiring is terminated at the power outlet, and the high frequency signal used for power line carrier communication is reflected. Can be reduced.
• the impedance adjusting unit 15 has high impedance in the frequency band used for power line carrier communication, and is, for example, an inductance element.
• the impedance adjuster 15 connects the power plug terminals l la and l ib to the power jack terminals 14a and 14b on the side of the power jack terminals 14a and 14b (on the side opposite to the power line feeding side) from the connection point of the termination circuit section 12. It is inserted between the tracks.
• the force in which the inductance element is inserted into both of the lines connecting the power plug terminals lla, 11b and the power jack terminals 14a, 14b can be inserted into only one of them. Good.
• the impedance adjustment unit 15 is inserted, resulting in high impedance over the frequency band used for power line carrier communication.
• the influence of the impedance of the electrical equipment on the power line carrier communication can be suppressed.
• it has a function to suppress noise generated from electrical equipment, so it is possible to improve SZN of power line carrier communications.
• the short-circuit switches 16a and 16b are for short-circuiting the impedance adjustment unit 15 inserted between the power plug terminals l la and l ib and the power jack terminals 14a and 14b, and operate in conjunction with the switching switch 131. . That is, when the switching switch 131 is turned off and the termination circuit unit 12 is disconnected from the power plug terminals lla and ib, the impedance adjusting unit 15 is short-circuited by the short-circuit switches 16a and 16b.
• This state is set when a communication device is connected to the power jack terminals 14a and 14b. Therefore, even if the impedance adjustment unit 15 is short-circuited, the termination circuit unit 12 is disconnected from the power plug terminals l la and l ib so that the input impedance can be stabilized. Attenuation of the communication signal by the unit 15 and absorption of the communication signal due to the insertion of the termination circuit unit 12 can be avoided, and efficient communication can be performed.
• the termination device shown in FIG. 9 can use the power jack terminals l la and l ib in an efficient state for the communication device and the electric device.
• FIG. 10 shows a schematic configuration of another example of the termination device according to the second embodiment of the present invention.
• the termination device in FIG. 10 has the same configuration as the termination device in FIG. 9 except that the configuration of the switching switch 132 and the short-circuit switches 161a and 161b are different.
• the short-circuit switch 16 lb of one line and the switching switch 132 are structurally integrated and interlocked. That is, when the short-circuit switch 161b is rotated counterclockwise, the termination circuit unit 12 is connected between the power plug terminals l la and l ib, and the impedance adjustment unit 15 is connected to the power plug terminal l ib and the power jack terminal. Inserted between 14b. Further, if the rotation is clockwise, the termination circuit unit 12 is disconnected and the impedance adjustment unit 15 is short-circuited. Therefore, the interlocking operation of the switching switch 132 and the short-circuit switches 16la and 161b is simplified.
• FIG. 11 shows a schematic configuration of still another example of the termination device according to the second embodiment of the present invention.
• the terminator shown in Fig. 11 has almost the same configuration as the terminator shown in Fig. 10 except that the terminator is built into a power outlet.
• the adjusting unit 15 and the short-circuit switches 161a and 161b are housed in an outlet case 200 (shown schematically in the figure) attached to the force wall 25. Note that the conductors connected to the power jack terminals lla and ib in Fig. 10 are connected to the power supply side conductors of the power outlet.
• the operation or method of use of the termination device in FIG. 11 is the same as that of the termination device in FIG. In FIG. 11, the power lines constituting the indoor power wiring are omitted.
• FIG. 12 shows a schematic configuration of still another example of the termination device according to the second embodiment of the present invention.
• the termination device in FIG. 12 has a connection type detection unit 17 that detects the type of the inserted power plug in the vicinity of the power jack terminals 14a and 14b.
• the switching switch 132 Depending on the detection result of the connection type detection unit 17, the switching switch 132 and Except for switching the short-circuit switches 16la and 161b, it has the same configuration as the termination device of FIG. 10 or the termination device of FIG.
• the connection type detection unit 17 detects whether the power plug connected to the power jack terminals 14a, 14b is the power of the communication device or the other electrical device. This detection can be performed mechanically or electrically. When performing mechanically, the shape of the power plug of the communication device is different from that of a normal electrical device (for example, a protrusion is provided), and it is determined whether or not the communication device is a switch by responding to the shape. To do. For electrical detection, the circumference of the signal flowing through the conductor from the power jack terminals 14a and 14b When the wave number is determined and a high-frequency signal used for communication is detected, it is determined that the communication device is connected.
• the impedance adjustment unit 15 is short-circuited by the short-circuit switches 161a and 161b, and the termination circuit unit 12 is disconnected by the switching switch 132.
• FIG. 13 shows a schematic configuration of an example of a termination device according to the third embodiment of the present invention.
• the terminator shown in Fig. 13 is used as an adapter that can be attached to and detached from the power outlet of the indoor power wiring in the same way as the terminator shown in Fig. 1, Fig. 9, and Fig. 10.
• the power plug terminals l la and l ib are inserted into the power jacks 51a and 5 lb of the power outlet 50 shown in FIG. 1 and connected to the power lines 52 and 52, respectively.
• the termination circuit unit 12 is connected between the power plug terminals l la and l ib via the switching switch 13.
• the switching switch 13 switches the connection of the termination circuit unit 12.
• the termination circuit unit 12 is connected between the power plug terminals lla and lib, the power plug terminal 11a and the power Disconnect the connection with the jack terminal 18a.
• the power jack terminals 14a and 14b are for signal transmission as well as power supply to the outside, and are connected to power plugs of electrical equipment other than the communication device.
• the termination circuit unit 12 has an impedance corresponding to the impedance between the indoor power wirings in the use frequency band of the power line carrier communication, and is configured by a series circuit of the capacitance element 121 and the resistance element 122. Therefore, when the termination circuit unit 12 is connected between the power plug terminals l la and l ib, the indoor power wiring is terminated at the power outlet, and the high frequency signal used for power line carrier communication is reflected. Can be reduced.
• the impedance adjustment unit 15 has high impedance in the frequency band used for power line carrier communication, and is, for example, an inductance element.
• the impedance adjuster 15 connects the power plug terminals l la and l ib to the power jack terminals 14a and 14b on the side of the power jack terminals 14a and 14b (on the side opposite to the power line feeding side) from the connection point of the termination circuit section 12. It is inserted between the tracks. In the termination device of FIG. 13, the force is inserted only in one of the lines where the inductance element is inserted into both lines connecting the power plug terminals lla, 1 lb and the power jack terminals 14a, 14b. Also good.
• the impedance adjustment unit 15 is inserted, resulting in high impedance in the frequency band used for power line carrier communication.
• the influence of the impedance of the electrical equipment on the power line carrier communication can be suppressed.
• it has a function to suppress noise generated from electrical equipment, so it is possible to improve SZN of power line carrier communications.
• the power jack terminals 18a and 18b are connected to the power plug terminals l la and 11b via the switching switch 13.
• the power jack terminals 18a and 18b are connected to the power plug of the communication device.
• the switch 13 Connect the power plug terminal 11a and the power jack terminal 18a.
• the termination device of FIG. 13 includes the power jack terminal (power supply terminal) having different functions, it is possible to connect both the communication device and the other electrical devices. Even when the communication device is connected and performing power line carrier communication, power is supplied to the electric device via the impedance adjustment unit 15, so that the influence of the impedance of the electric device on the power line carrier communication can be suppressed. In addition, SZN of power line carrier communication can be improved. In addition, since the communication device is connected to the power line without going through the impedance adjustment unit 15 and the termination circuit unit 12 is also disconnected, the communication signal is attenuated by the impedance adjustment unit 15 and the termination circuit unit 12 is inserted. Efficient communication is possible by avoiding absorption of communication signals.
• FIG. 14 shows a schematic configuration of another example of the termination device according to the third embodiment of the present invention.
• the termination device in Figure 14 is almost the same as the termination device in Figure 13 except that it is built into a power outlet.
• the conductors connected to the power jack terminals lla and lib in FIG. 13 are connected to the power supply side conductors of the power outlet.
• FIG. 15 shows a schematic configuration of still another example of the termination device according to the third embodiment of the present invention.
• the terminator shown in FIG. 15 is configured such that the elements included in the terminator shown in FIG.
• the termination device of FIG. 15 includes power plug terminals l la and l ib, a termination circuit unit 12, a switching switch 13 and power jack terminals 18a and 18b, and these elements are schematically shown in an adapter housing 1 It is stored in 00. Further, the impedance adjustment unit 15 and the outlet connection ports 19a, 19b, 19c and 19d are included, and these elements are accommodated in the outlet tap casing 300 schematically shown.
• the adapter housing 100 includes a power cord connecting portion 21 connected to the power plug terminals l la and l ib, and the outlet tap housing 300 is connected to the outlet connecting ports 19a, 19b, 19c, via the impedance adjusting portion 15.
• a power cord connecting part 22 connected to 19d is provided. The power cord connecting part 21 and the power cord connecting part 22 are connected via the power cord 20.
• the power plug terminals l la and l ib, the termination circuit section 12, the switching switch 13, and the power jack terminals 18a and 18b are the same as those of the termination device in FIG. 13, and the power jack terminals 18a and 18b communicate with each other.
• the device is connected.
• the impedance adjuster 15 is also the same as that of the termination device of FIG. 13, and the impedance adjuster 15 is inserted even when a low-impedance electrical device is connected to the outlet connection ports 19a, 19b, 19c, 19d.
• the impedance becomes high in the frequency band used for power line carrier communication, the influence of the impedance of the electric device on the power line carrier communication can be suppressed.
• it since it has a function to suppress noise generated from electrical equipment, it is possible to improve SZN for power line carrier communications.
• FIG. 16 shows a schematic configuration of still another example of the termination device according to the third embodiment of the present invention.
• the terminator shown in FIG. 16 is configured by housing the elements included in the terminator shown in FIG. 13 in two cases and connecting the cases with a power cord.
• the termination device of FIG. 16 includes a termination circuit section 12, a switching switch 13, an impedance adjustment section 15 and an outlet connection port 18, 19a ⁇ 19b ⁇ 19c ⁇ 19d, and these elements are illustrated schematically. It is stored in the tap housing 400. In addition, a plug housing 11c for storing the power plug terminals 11a and ib is provided. Plug housing 11c and outlet tap housing 400 are connected by power cord 20. The power cord 20 is connected to both ends of the termination circuit section 12 through the switching switch 13 and further connected to the outlet connection port 18. Further, it is connected to the outlet connection ports 19a, 19b, 19c, and 19d via the impedance adjustment unit 15.
• the termination circuit unit 12 is shown by switching and connecting a plurality of impedance elements as shown in FIG. 2 (d), but the one shown in FIG. It may be.
• the termination device of FIG. 16 uses the outlet connection ports 19a, 19b, 19c, and 19d for low-impedance electrical equipment, as in the termination device of FIG.
• the outlet connection port 18 is used for a communication device.
• the operation or use method of the termination device of FIG. 16 is the same as that of the termination device of FIG.
• FIG. 17 shows a schematic configuration of still another example of the termination device according to the third embodiment of the present invention.
• the terminator shown in Fig. 17 has power plug terminals l la, l ib, termination circuit 12, switching switch 13 1, impedance adjustment ⁇ 15, tap connection port 19a ⁇ 19b ⁇ 19c ⁇ 19d, short circuit switch 19a a ⁇ 19ba ⁇ 19ca ⁇ 19da ⁇ 19ab ⁇ 19bb ⁇ 19cb ⁇ Contains 19db.
• the power plug terminals l la, l ib, the termination circuit section 12, and the switching switch 13 are housed in the adapter housing 100 schematically shown, and the impedance adjustment section 15, tap connection ports 19a, 19b, 19c ⁇ 19d
• the short-circuit switches 19aa, 19ba, 19ca, 19da, 19ab, 19bb, 19cb, and 19db are housed in an outlet tap housing 500 schematically shown.
• the adapter casing 100 and the outlet tap casing 500 are connected via the power cord 20.
• the power cord 20 Power cord connector 22 connected to power plug terminals l la and l ib in power supply case 100, impedance adjustment unit 15, short-circuit switch 19aa, 1 9ba, 19ca, 19da, 19ab , 19bb, 19cb, and 19db are connected to tap connection ports 19a, 19b, 19c, and 19d. Further, the power cord connecting portion 22 is directly connected to the tap connection ports 19a to 19b to 19c and 19d through the short-circuit switches 19aa, 19ba to 19ca to 19da to 19ab to 19bb to 19cb to 19db.
• Short-circuit switch 19aa ⁇ 19ba ⁇ 19ca ⁇ 19da ⁇ 19ab ⁇ 19bb ⁇ 19cb ⁇ 19db switches between insertion and short-circuit of the impedance adjustment section 15, and is a short-circuit switch corresponding to the tap connection port to which the communication device is connected. Is switched so as to short-circuit the impedance adjuster 15. Further, the switching switch 3 switches so that the terminal circuit unit 12 is disconnected when a communication device is connected to any of the tap connection ports 19a, 19b, 19c, and 19d.
• the power line carrier communication can be performed regardless of whether a communication device is connected to the plurality of tap connection ports 19a, 19b, 19c, and 19d or an electrical device other than the communication device is connected. SZN can be improved and efficient communication becomes possible.
• FIG. 18 shows a schematic configuration of still another example of the termination device according to the third embodiment of the present invention.
• the terminating device in FIG. 18 is configured as an adapter connected to a power cord of a communication device that performs power line carrier communication.
• the termination device in FIG. 18 includes power plug terminals l la, l ib, termination circuit unit 12, switching switch 13, power jack terminal (first power supply terminal) 14a, 14b, impedance adjustment unit 15, power supply
• a source cord connection portion (second power supply terminal) 21 is included and accommodated in an adapter housing 100 schematically shown.
• the power cord connecting portion 21 is connected to the power cord 20 of the PLC modem 90 and is connected to the power plug terminals l la and l ib via the switching switches 13a and 13b.
• the termination device of FIG. 18 operates in the same manner as the power cord terminals 18a and 18b of the termination device of FIG. 13 connected to the power cord 20 of the PLC modem 90. It can be used. That is, electrical devices other than communication devices are connected to the power jack terminals 14a and 14b, and when the PLC modem 90 is used, the switching switch 13 is connected to the power cord connecting portion 21 and the termination circuit portion 12 is connected. Separate.
• FIG. 19 is a block diagram illustrating a hardware example of the PLC modem of FIGS. 13 and 18.
• the PLC modem 90 has a casing 900 (broken line).
• the casing 900 is provided with a power connector 71 and a modular jack 72 for a LAN (Local Area Network) such as RJ45.
• a power cord 20, which is an example of a power line, is connected to the power connector 71.
• a LAN cable 600 is connected to the modular jack 72.
• the PLC modem 90 includes a switching power supply 60 and a circuit module 70 therein.
• the switching power supply 60 supplies various voltages (for example, +1.2 V, +3.3 V, and +12 V) to the circuit module 70.
• the circuit module 70 includes a main IC 73, an AFE'IC (Analog Front End IC) 75, a low-pass filter 76, a dry IC 77, a coupler 79, a band-pass filter 80, a memory 81, and an Ethernet PHY'IC 82.
• AFE'IC Analog Front End IC
• the main IC 73 includes a CPU (Central Processing Unit) 73A, a PLC-MAC (Power Line Communication ⁇ Media Access Control layer) block 73C, and a PLC ⁇ PHY (Power Line Communication ⁇ Physical layer) block 73B. ing.
• the CPU 73A is equipped with a 32-bit RISC (Reduced Instruction Set Computer) processor.
• the PLC 'MAC block 73C manages the MAC layer of the transmission signal, and the PLC'PHY block 73B manages the PHY layer of the transmission signal.
• the AFE-IC75 includes a DA converter (DAC) 75A, an AD converter (ADC) 75B, and variable amplifiers (VGA) 75C and 75D.
• the coupler 79 includes a coil transformer 79A and coupling capacitors 79B and 79C.
• the present invention is useful as a terminating device or the like capable of power line carrier communication in which deterioration of communication quality is suppressed without reducing communication efficiency.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
• Details Of Connecting Devices For Male And Female Coupling (AREA)

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• 2005
  • 2005-10-26 JP JP2005311402A patent/JP4712521B2/ja not_active Expired - Fee Related
• 2006
  • 2006-10-23 WO PCT/JP2006/321045 patent/WO2007049550A1/ja not_active Ceased
• 2008
  • 2008-04-25 US US12/110,143 patent/US7737574B2/en not_active Expired - Fee Related

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