Abstract: A power line carrier communication apparatus which prevents leakage of an electromagnetic wave and stably operates while employing a simplified configuration is provided. The power line carrier communication apparatus may include a transmission circuit which is connected to a power line and which transmits a signal to the power line; a reception circuit which is connected to the power line and which receives the signal from the power line; and an output suppression circuit which is connected to the power line and which, by connecting a signal attenuating element between the transmission circuit and a common only when the transmission circuit transmits the signal, suppresses an output of the signal transmitted from the transmission circuit.

Abstract: The present invention provides a communication circuit, a communication network, and a connecting apparatus that can realize communication with very high reliability using a simple wiring system, that includes a communication line 2 comprising three or more signal lines 2a,2b,2c, a signal distributing section 4, that is connected to one end of the communication line 2, for distributing and transmitting a signal input into an input terminal 3i to respective signal lines 2a,2b,2c, and a majority selection receiving circuit 5, that is connected to the other end of the communication line 2, for comparing a plurality of reception signals received via the signal lines 2a,2b,2c and selecting reception signals which are most matched with one another as true so as to output them to an output terminal 30.

Abstract: A power line carrier communication reception circuit which can precisely receive a signal to be superimposed at such a signal level that leakage of an electromagnetic wave does not cause a problem while employing a simplified configuration is provided. The power line carrier communication reception circuit may include an amplifier which is connected to a power line and amplifies a received signal to be superimposed on the power line; two capacitors which are connected in series between both power sources of the amplifier; and a clipper circuit which connects connection points of these capacitors to the power line and limits the received signal in a predetermined range of a reference voltage between the capacitors, and in which the amplifier compares the signal limited by the clipper circuit and the reference voltage and amplifies the signal.

Abstract: A power line carrier communication reception circuit which can precisely receive a signal to be superimposed at such a signal level that leakage of an electromagnetic wave does not cause a problem while employing a simplified configuration is provided. The power line carrier communication reception circuit may include an amplifier which is connected to a power line and amplifies a received signal to be superimposed on the power line; two capacitors which are connected in series between both power sources of the amplifier; and a clipper circuit which connects connection points of these capacitors to the power line and limits the received signal in a predetermined range of a reference voltage between the capacitors, and in which the amplifier compares the signal limited by the clipper circuit and the reference voltage and amplifies the signal.

Abstract: A power line carrier communication apparatus which prevents leakage of an electromagnetic wave and stably operates while employing a simplified configuration is provided. The power line carrier communication apparatus may include a transmission circuit which is connected to a power line and which transmits a signal to the power line; a reception circuit which is connected to the power line and which receives the signal from the power line; and an output suppression circuit which is connected to the power line and which, by connecting a signal attenuating element between the transmission circuit and a common only when the transmission circuit transmits the signal, suppresses an output of the signal transmitted from the transmission circuit.

Abstract: An automatic control system synchronizes and controls a control target while preventing unnecessary signal processing. The system includes a slave station that is connected to the control target, a master station that is connected to a control unit for controlling the control target, a contact point information collection and distribution device that collects and distributes a series of contact point information communicated at a predetermined communication cycle, and communication lines connecting between the master and slave stations via the contact point information collection and distribution device. The contact point information collection and distribution device collects and distributes the series of contact point information in synchronization with all the communication lines under the control of the control unit.

Abstract: The present invention provides a control device at an opening/closing section of a vehicle and a method for controlling the opening/closing section of the vehicle for controlling a motor so that pinch at the opening/closing section is determined accurately while its constitution is very simple. The control device includes a pinch determination device that is mounted to a motor for opening/closing an opening/closing section of a vehicle and determines pinch of a foreign matter based on a change in the rotation number of the motor, and demagnetization pulse applying means for supplying power with reverse polarity to motor in a pulse-like manner at completion of the opening/closing.