Abstract:
PROBLEM TO BE SOLVED: To provide a power line carrier communication apparatus capable of achieving stable operation by preventing leakage of electromagnetic waves even with a simplified configuration.SOLUTION: The power line carrier communication apparatus comprises: a transmission circuit 10 that is connected with a power line 9 and transmits a signal S1s to the power line 9; a reception circuit 11 that is connected with the power line 9 and receives a signal S1r from the power line 9; and an output suppression circuit 12 that is connected with the power line 9 and suppresses an output of a signal S1s transmitted from the transmission circuit 10 by connecting a signal attenuation element 12A between the transmission circuit 10 and a common c only during transmission of a signal S1s by the transmission circuit 10.
Abstract:
PROBLEM TO BE SOLVED: To provide: a switch state change-monitoring circuit capable of monitoring states of all monitoring-object switches by the action of reducing power consumption as far as possible in a standby state of a moving body such as a vehicle, and immediately detecting occurrence of a change; a moving body state-monitoring system; a moving body with a state monitoring function; and a state monitoring-adaptive switch.SOLUTION: There are included: a pulse application circuit 17 that is connected to contacts 4X, 4Y and 5X, 5Y of monitoring-object switches 4 and 5 to apply a cyclic monitoring pulse P1; an integration circuit that obtains an integrated value of a voltage at a junction P between the pulse application circuit 17 and the monitoring-object switches 4 and 5; an amplification circuit that is connected to the integration circuit, compares the integrated value with a threshold, and outputs an amplified integrated value; a differentiation circuit that is connected to the amplification circuit and obtains a differential value from a change in the amplified integrated value; and a change determination circuit that is connected to the differentiation circuit and determines a state change of each of the monitoring-object switches on the basis of each of the differentiation values.
Abstract:
PROBLEM TO BE SOLVED: To provide an automatic control system, a contact information gathering and distributing device, and a slave station of the automatic control system that can control a control object by synchronizing it while preventing wasteful signal processing.SOLUTION: An automatic control system comprises: a slave station 3 connected with a control object 2; a master station 5 connected with a control unit 4 controlling the control object 2; a contact information gathering and distributing device 6 that gathers and distributing a series of contact information communicated in a prescribed communication period T lying between the master station 5 and the slave station 3; and a plurality of communication lines 7, 8 connecting between the master station 5 and the slave station 3 via at least one contact information gathering and distributing device 6. The contact information gathering and distributing device 6 gathers and distributes a series of contact information in synchronization with all the communication lines 7, 8. The control unit 4 compares contact information gathered via the contact information gathering and distributing device 6 with past contact information gathered in a previous communication period, and regards the contact information as true when they agree, and performs control by this true contact information.
Abstract:
PROBLEM TO BE SOLVED: To provide a receiver circuit for power-line carrier communication, capable of highly precisely receiving a signal superimposed with a signal level to a degree that leakage of an electromagnetic wave is negligible even with a simplified configuration.SOLUTION: The receiver circuit includes: an amplifier 28 that is connected with a power line 9 and amplifies an input signal S1r superimposed on the power line 9; two capacitors 25, 26 connected in series between both power supplies C, Vcc of the amplifier 28; and a clipper circuit 27 that restricts the input signal S1r to a predetermined range relative to a reference voltage Vth between both the capacitors by connecting connection points of the capacitors 25, 26 with the power line 9. The amplifier 28 compares a signal restricted by the clipper circuit 27 to the reference voltage Vth before amplification.
Abstract:
PROBLEM TO BE SOLVED: To provide a vehicle state monitoring system, a state monitoring support switch, a vehicle with a state monitoring function, and a state monitoring method, which are capable of monitoring the states of all monitoring-target switches in a vehicle by performing operation with which power consumption of the vehicle is reduced as much as possible in a standby state, and detecting occurrence of a change in the state when such change occurs.SOLUTION: A vehicle state monitoring system, for use in monitoring states of plural switches 4, 5 disposed in a vehicle 2 in a standby state in which a control part 8 of the vehicle 2 operates in saving power than in a normal operation state, includes: monitoring-pulse application means 14 for applying a cyclical monitoring pulse, in the standby state, to a communication line 9 wired to the individual monitoring-target switches 4, 5; change signal output means 19, disposed respectively between the individual monitoring-target switches 4, 5 and the communication line 9, for transmitting a state change signal Si to the communication line 9 when a state change of a monitoring-target switch 4 or 5 is detected; and monitoring-means 15, connected to the communication line 9, for receiving the state change signal Si to unlatch the standby state of the control part 8 when a state change occurs to a monitoring-target switch 4 or 5.
Abstract:
PROBLEM TO BE SOLVED: To provide a communication circuit, a communication network, and a connecting apparatus that can realize communication with very high reliability using a simple wiring system. SOLUTION: The communication circuit includes: a signal line 2 constituted of three or more signal lines 2a, 2b, 2c; a signal distribution part 4 which is connected to one end of the signal line 2 and transmits a signal input to an input terminal 3i to each of the signal lines 2a, 2b, 2c in a distributed manner; and a majority decision selection receiving circuit 5 which is connected to the other end of the signal line 2, compares a plurality of reception signals to be received via the respective signal lines 2a, 2b, 2c, selectively receives the reception signal with much coincidence as a true reception signal, and outputs the reception signal to an output terminal 3o. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To suppress power consumption.SOLUTION: A power line communication system 10 includes a master communication node 11 and a slave communication node 12 connected to a DC power line communication line 13. The master communication node 11 periodically transmits a token forming transmission/reception right data as an AC signal component to the DC power line communication line 13, and the slave communication node 12 receives the token transmitted from the master communication node 11 and transmits/receives data forming an AC signal component over the DC power line communication line 13 according to the token. The slave communication node 12 transmits a start request signal to request the start of the master communication node 11 as an AC signal component when the master communication node 11 is idle, and the master communication node 11 receives the start request signal transmitted from the slave communication node 12 and starts to periodically transmit the token according to the start request signal.
Abstract:
PROBLEM TO BE SOLVED: To provide a communication circuit, a relay connecting circuit, and a communication network that have a very simple configuration and high reliability, and transmit/receive contact signals usable for automatic control. SOLUTION: The communication circuit includes: a transmitting section 4 for transmitting a contact signal input into an input/output section 3a, 3b to a communication line 2; a receiving section 5 for receiving a signal via the communication line 2; an input/output circuit 6 for outputting the contact signal received by the receiving section 5 via the input/output section 3a, 3b and interlocking to prevent input of another contact signal via the input/output section 3a, 3b that outputs a contact signal; and a time division communication control section 7 for switching a communication direction among the transmission section 4, the receiving section 5 and the input/output circuit at time-divided timing. COPYRIGHT: (C)2011,JPO&INPIT
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.