JPS62250728A - Power source line coupler - Google Patents

Abstract

PURPOSE:To eliminate an insulating defect and to allow plugs belonging to different power source lines to communicate by transmitting a signal wave taken out of one power source line to a signal transmission means through an electrically insulated transmission medium. CONSTITUTION:A signal lying in one power source line is transmitted to the other power source line between the power source lines LA and LB through the signal transmission means composed of optical modules l4A and l4B and an optical fiber 16. The signal is transmitted through the optical fiber 16 being the electrically insulated transmission medium, whereby the independent power source lines LA and LB are electrically insulated, and various troubles such as the insulating defect between the power source lines LA and LB and problems caused by the defect can be eliminated. There is no polarity in terms of connecting the power source lines LA and LB of power line carrier transceivers PLCTs 12A and 12B, and therefore transmission is easily made between plugs from the power source line LA to LB.

Description

TECHNICAL FIELD The present invention relates to a power line coupler that transmits signals between mutually independent power lines.

By using an interface, such as a carrier current transceiver, that allows signals to be exchanged between prior art equipment and a power line, it is possible to transmit signals from one side of equipment to another through a common power line. It is being done.

Problems to be solved by the invention However, power lines installed inside buildings, etc.
In many cases, the windings are not single, but are independently derived from a plurality of secondary windings of a common power transformer or from secondary windings of separate power transformers, and installed as independent systems in each room or area. In such cases, since the power lines are not common but are independent from each other, there are cases where signals cannot be exchanged between the devices even if conventional interfaces are used. In other words, it is difficult to judge from the appearance of a power outlet to which system it belongs, and even if it were possible, it is difficult to determine which system the power outlet belongs to, and even if it were possible, it would be difficult to determine which system the power outlet belongs to. A common power line does not necessarily exist between devices.

On the other hand, it is conceivable to provide a coupler between mutually independent power supply lines, which has an extremely high impedance in the power supply frequency band and an extremely low impedance in the data signal frequency band. Typically, such couplers are equipped with a capacitor of appropriate capacity. However, in this case, the power lines of the independent systems are electrically connected via the capacitors, which causes various problems such as electric shock accidents due to poor insulation of the capacitors.

In addition, since it is necessary to install a capacitor between wires of the same phase among the wires that make up each power line, when communicating between devices, it is easy for workers to connect capacitors between outlets belonging to different power lines. The problem was that it was not possible.

Means for Solving the Problems The present invention has been made against the background of the above circumstances.
The gist thereof is a power line coupler that is installed between mutually independent power lines and transmits a signal present in one of the power lines to the other power line, and includes (1) one of the power lines; (2) a signal transmission means for transmitting the signal wave extracted by the signal extraction means via an electrically insulated transmission medium; (3) the signal transmission; and signal sending means for sending the signal transmitted by the means to the other of the power supply lines.

In this way, the signal wave extracted from one of the power supply lines by the signal extraction means is transmitted to the signal transmission means by the signal transmission means that transmits it via an electrically insulated transmission medium, This signal sending means sends out the signal to the other side of the power supply line. Therefore, since the independent power supply lines are electrically insulated, poor insulation between the power supply lines and various inconveniences caused by this are eliminated. Also,
The signal extraction means is for extracting a signal present in the electric wire that constitutes one side of the power supply line, and the signal transmission means is for sending a signal to the electric wire that constitutes the other side of the power supply line, and these signal extraction means and Since there is no polarity in the connection of the signal sending means to each power line, communication between devices can be easily achieved by an operator simply by inserting the power line coupler between outlets belonging to different power lines.

EXAMPLE Hereinafter, an example of the present invention will be described in detail based on the drawings.

In FIG. 1, a power line LA and a power line L are independent from each other and have different secondary windings of a power transformer (not shown), and a power line between them is a power line for transmitting a signal present in one power line to the other power line. A coupler is provided. This power line coupler is a 10A outlet.
and power line carrier transceivers (hereinafter referred to as PLCT) 12A and 12.1 connected to one power line LA and the other power line LB via 10g, respectively. and these P L CT 12 a and 12
The signal output from fi is converted into an optical signal, and the optical signal is converted into an electrical signal, and the PLCTs 12A and 12.
It is provided with optical modules 14^ and 14m that output to the optical module 14A and 14m, and an optical fiber 16 that connects the optical modules 14A and 14.

The above PLCT12A and 12. are constructed in the same way as shown in FIG. For example, PLCT12
^ is equipped with a transformer 18A, capacitors CI and C2, and an IC chip 19 containing several types of external components such as capacitors, resistors, and trimmers, and exists in a form superimposed on the power waveform on the power line LA. A data signal is extracted by extracting the FM modulated signal wave through a resonant circuit consisting of a transformer 18A and a capacitor c2, and demodulating the signal wave, and outputting the data signal to the optical module 14A through an output terminal 20A. . Further, the PLCT 12A performs FM modulation on the data signal supplied from the optical module 14° through the input terminal 22A at a predetermined carrier frequency, and then sends the data signal to the power supply inlet LA through the resonance circuit. Also, P L CT 1
2A is a transmission mode for transmitting a data signal to the optical module 14m, and a transmission mode for transmitting a data signal to the optical module 14. It is provided with a selection terminal 24A for selecting one of the reception modes and the reception mode for receiving data signals from. When no signal is supplied to the selection terminal 24A, the PLCT 12A is maintained in the receiving mode. In addition, in Fig. 2, C3
C2 is a capacitor having a capacitance that has an extremely high impedance in the power supply frequency band and an extremely low impedance in the data signal modulation frequency band, and C2 connects a resonant circuit whose resonance frequency is the modulation frequency with one winding of the transformer 18A. It is a capacitor whose capacity is determined so as to be configured.

The optical module 14A and the optical module 14m are configured similarly to each other. For example, the optical module 14A outputs an optical signal corresponding to the data signal to the optical fiber 16 by driving the light emitting element 26A based on the data signal supplied from the PLCT 12A, and also outputs an optical signal corresponding to the data signal to the optical fiber 16. The optical signal is transmitted to the light receiving element 28
When received by A, a data signal corresponding to the optical signal is supplied to the PLCT 12A. The optical module 14A also has a selection terminal 30A for selecting either a transmission mode in which the optical signal is output to the optical fiber 16 or a reception mode in which the optical signal transmitted through the optical fiber 16 is received.
It is equipped with When no signal is supplied to the selection terminal 30A, the optical module 14A is placed in a receiving mode. In a state where light is input to the light receiving element 28A, a signal indicating the light receiving state is transmitted to the PLC.
It is supplied to the selection terminal 24A of T12a and also to the AND gate 34A via the inverter 32A. As a result, the PLCTI 2 is switched to the transmission mode (mode B for sending a signal to the power line L).

The AND gate 34A is opened while the signal indicating the light receiving state from the light receiving element 28A is not supplied, thereby indicating that the signal from the carrier detection circuit 36A is supplied to the selection terminal 30A of the optical module 14A. Allow. This carrier detection circuit 36A detects the carrier wave of the signal present on the power supply line LA, and outputs a signal indicating the presence of the carrier wave while this carrier wave is being detected.

As a result, the optical module 14A switches to the transmission mode (a state in which a signal is output to the other optical module 14. It will be done. Inverter 32m on power line L side
, AND gate 348, and carrier detection circuit 36.
are provided respectively, but the inverter 32a
, AND gate 34A, and carrier detection circuit 36A
Since it is the same as that, the explanation will be omitted.

As described above, according to this embodiment, the power lines LA and L
between the optical modules 14A and 14B
A signal present on one side of the power supply line is transmitted to the other by means of signal transmission means consisting of an optical fiber 16 and an optical fiber 16, which is an electrically insulated transmission medium.
An independent power line LA
Since the power supply line L and L8 are electrically insulated, poor insulation between the power supply line L and L8 and various inconveniences caused by this are eliminated.

Also, for example, if the signal is from the power line LA.

PLCT functions as a signal extraction means when sent to
The PLCT 12a is for extracting signals present in the electric wires forming the power line LA, and the PLCT 12g, which functions as a signal sending means, is for sending signals to the electric wires forming the power line L.
Since there is no polarity in the connections with the power lines L and 12B, operators can easily communicate between devices by simply inserting the power line coupler between outlets belonging to different power lines. It can be done.

Next, another embodiment of the present invention will be described. Note that in the following embodiments, parts common to those in the above-described embodiments are designated by the same reference numerals, and explanations thereof will be omitted.

In FIG. 3, a pair of transceiver modules 40A and 40. are transceivers that transmit and receive signals using radio waves, ultrasonic waves, and light, and are configured in the same way. In this embodiment, as shown in FIG. 4, command signals 1 and 2 are arranged at the leading and trailing ends of a series of signals to be sent and received, respectively, and a first Command detection circuits 42A and 42.
detects the command signal 1 from among the signals output from the output terminals 20A and 201+ of the PLCTs 12A and 128, and the transmitting/receiving module 4 is in the constant reception mode.
0A and 40. is switched to the transmission mode (a state in which the signal is transmitted to the other transceiver module) until the terminal command signal 1 is detected. Also, second command detection circuits 44A and 42 . is PLC
T12A and 12. The command signal 2 is detected from among the signals output from the input terminals 22A and 228 of the PLCTs 12m and 12. which are in the constant reception mode. is switched to the transmission mode (state H for sending a signal to the power supply line) until the terminal command signal 2 is detected.

In this embodiment as well, the signal is transmitted between the transmitting/receiving modules 40A and 40g constituting the signal transmitting means through air, which is an electrically insulated transmission medium, and an independent power line LA is established. Since the space between them is electrically insulated, the same effect as in the previous embodiment can be obtained.

Here, if the modulation frequencies of the signals, that is, the carrier frequencies, are made different from each other, it is possible to simultaneously transmit bidirectional signals between the power supply lines La and 6.

FIG. 5 shows an example of a power line coupler capable of simultaneous bidirectional signal transmission.

In the figure, a resonant circuit consisting of one winding of a transformer 48A on the power line LA side and a capacitor C3, and a resonant circuit consisting of one winding of a transformer 488 on the power line Lll side and a capacitor C3 are connected from the power line LA side. It constitutes a resonant circuit for the carrier frequency of the signal transmitted to the Lll side. Therefore, the power supply line L is
The signal extracted from A is sent to an amplifier 50A and a photocoupler 52.
, amplifier 50m, transformer 48. The power is transmitted to the power supply line L through a resonant circuit consisting of one winding of the circuit and a capacitor C3, respectively. Further, a resonant circuit consisting of one winding of the transformer 54A on the power line LA side and the capacitor C4, and a resonant circuit consisting of one winding of the transformer 548 and the capacitor C4 on the power line LII side are connected to the power line L.

It constitutes a resonant circuit for the carrier frequency of the signal transmitted from the LA side to the LA side. Therefore, the signal extracted from the power supply line L by the resonant circuit consisting of one winding of the transformer 54° and the capacitor C4 is transmitted to the amplifier 56B and the photocoupler 5.
8. Amplifier 56A1 The signal is transmitted to the power line LA side through a resonant circuit consisting of one winding of the transformer 54A and a capacitor C4.

In this embodiment as well, photocouplers 52 and 58, which are signal transmission means for transmitting signals via an electrically insulated transmission medium, between the independent power supply lines LA and
Since the signal is transmitted via the above-described embodiment, the same effects as in the previous embodiment can be obtained.

In addition, as shown in FIG. 6, the P on the power line LA side
A photocoupler 5 connects the output terminal 20A of the LCT 12a and the input terminal 22° of the PLCT 12g on the power line L++ side.
2 and the output terminal 20.2 of the PLCT 121. PL and the input terminal 22A of the CT 12A may be connected via a photocoupler 58. In this case, carrier detection circuits 62A and 62. are each PLC
T12A and 12g input terminals 22A and 22. Detects the carrier wave from the signal transmitted to PLCTI2A
and switches i2g to transmit mode.

Although one embodiment of the present invention has been described above based on the drawings,
The invention also applies in other aspects.

For example, in the embodiment of FIG.
A is configured to receive a frequency modulated wave from the PLCT 12A and output an amplitude modulated wave, and is connected to the optical module 14.A.
may be configured to receive an amplitude modulated wave and transmit a frequency modulated wave to the power line L.

The above-mentioned embodiment is merely one embodiment of the present invention, and various modifications may be made to the present invention without departing from its scope.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating the configuration of an embodiment of the present invention. FIG. 2 is a circuit diagram showing an example of the configuration of the PLCT shown in FIG. 1. FIG. 3 is a diagram corresponding to FIG. 1 of another embodiment of the present invention. FIG. 4 is a diagram showing an example of the configuration of signals transmitted between power supply lines in the embodiment of FIG. 3. 5 and 6 are diagrams corresponding to FIG. 1 for explaining an embodiment in which simultaneous bidirectional signal transmission is possible between power supply lines. 12A, 12g: PLCT (signal extraction means, signal transmission means) 14A, 14s: Optical module (signal transmission means) 1
6: Optical fiber 40A, 40m: Transmission/reception module (signal transmission means)

Claims (1)

[Scope of Claims] A power line coupler provided between mutually independent power lines for transmitting a signal present on one of the power lines to the other power line, the signal being present on one of the power lines a signal extraction means for extracting the wave; a signal transmission means for transmitting the signal wave extracted by the signal extraction means via an electrically insulated transmission medium; and a signal transmission means for transmitting the signal transmitted by the signal transmission means to the power line. A power line coupler comprising: means for sending a signal to the other side of the power line coupler.