Mitsubishi Electric Corporation

Renesas Electronics Corporation

Mitsubishi Electric Corporatio

Masahiro Ishihara

Yoshiaki Koizumi

Hiroaki Kotake

Osamu Yamashita

Takuya Mukai

Yasuhiko Kokami

Hiroaki Endo

Satoshi Endo

Toshiyuki Tsunoda

Hiroshi Kuroiwa

Shinsaku Kusube

Minoru Kurosawa

Yoshihiro Taniguchi

Yasushi Kuwabara

Hiroaki Ushirosako

Satoshi Hanai

Yoshiro Murakami

Masaki Takata

Yohei Miyaura

Yoshitaka Otaki

A device management system () includes a common certification information acquirer, a certifier, an identification information generator, and a setter. The common certification information acquirer acquires common certification information from a device () including a storage for storing the common certification information. The common certification information stored in the storage is shared with another device. The certifier certifies the device () based on the common certification information. The identification information generator generates identification information for identification of the device () certified by the certifier. The setter sets the identification information to the device ().

Device management system, network adapter, server, device, device management method, and program

An air conditioning system includes: outdoor units; indoor units each communicating with any one of the outdoor units by a first communication method; and a central control device communicating with each of the outdoor units by a second communication method and controlling the outdoor units and the indoor units. One of the outdoor units generates, by using a first address used for communication performed using the first communication method, a second address used for communication performed using a second communication method, generates a second address for one or more of the indoor units by using a first address, and obtains second addresses from another outdoor unit and the central control device. The central control device obtains, from each of the outdoor units, second addresses of the outdoor unit and each indoor unit, and controls operations of the outdoor units and the indoor units by using the second addresses obtained.

Air conditioning system and communication method

In a communication device, a communicator communicates with a communication counterpart using a first communication mode or a second communication mode. When a communication by the communicator with the communication counterpart using the second communication mode is reset due to a first cause, if the communication with the communication counterpart using the second communication mode is acceptable, a communication controller causes the communicator to resume communication with the communication counterpart using the second communication mode, and if the communication with the communication counterpart using the second communication mode is unacceptable, the communication controller causes the communicator to start a communication with the communication counterpart using the first communication mode. When the communication by the communicator with the communication counterpart using the second communication mode is reset due to a second cause, the communication controller causes the communicator to resume communication with the communication counterpart using the second communication mode.

Communication device, communication system, communication method, and program

A communication apparatus is connected to another communication apparatus via a power source line, a signal line, and a shared line. The communication apparatus includes a detector and a communicator. The detector detects the phase of an alternating-current voltage applied between a first terminal for connecting to the power source line and a second terminal for connecting to the shared line. The communicator communicates with the other communication apparatus by executing at least one of transmission or reception of an electric current signal generated by opening and closing a circuit including the signal line and the shared line except when the phase detected by the detector is within a specific range. The specific range is defined as a range in which an induced electric current flowing through the signal line due to the alternating-current voltage is greater than a reference value.

Communication device, communication method and program

A voltage application circuit including a photocoupler and a resistor applies, to a reception terminal, a voltage corresponding to an intensity of a communication current flowing through a transmission path. A reception control unit determines whether the communication current is flowing, by comparing the voltage applied to the reception terminal with a predetermined voltage threshold. A voltage adjustment circuit including a resistor and a transistor adjusts the voltage that is applied to the reception terminal by the voltage application circuit. A switch control unit switches a current threshold used for determining whether the communication current is flowing by controlling the voltage adjustment circuit in accordance with an intensity of the communication current during an on-control period.

Reception device and communication system

A communication system comprises a communication device and communication devices. The communication device comprises a direct current power supply and a transmitter configured to transmit data by control of a current flowing through a current loop. The communication devices comprise a receiver configured to receive data by detection of the current flowing through the current loop. The communication device comprises an adjuster configured to adjust the impedance between a signal line and a common line according to the number of communication devices.

Communication system and communication apparatus

A transmission circuit includes a photocoupler, a conductive/non-conductive state of which is controlled in accordance with data to be transmitted to a communication device. A reception circuit includes a photocoupler, a conductive/non-conductive state of which is controlled in accordance with the conductive/non-conductive state of the transmission path. A transmission circuit includes a photocoupler, a conductive/non-conductive state of which is controlled in accordance with data to be transmitted to a communication device. A reception circuit includes a photocoupler, a conductive/non-conductive state of which is controlled in accordance with the conductive/non-conductive state of the transmission path. The photocoupler is included in the transmission path. The photocoupler and the photocoupler are in opposite conductive/non-conductive states.

Communication system and transmission apparatus

Either one of a communication device and a communication device comprises a direct current power supply configured to generate a direct current for serial communication from alternating current power supplied from an alternating current power supply through a power line and a common line and pass the generated direct current through a current loop. Either the communication device or the communication device comprises an adjuster configured to adjust the impedance between a signal line and the common line based on the voltage between the signal line and the common line ().

Communication system, transmission device, and reception device

A signal conversion system comprises measuring units, a switcher, a converter, and a host. The converter mutually converts signals transmitted in compliance with a first protocol for communicating with a pre-specified party and signals transmitted in compliance with a second protocol different from the first protocol. The host specifies a given measuring unit among the measuring units communicating in compliance with the first protocol. Then, the switcher switches the transmission channel of signals transmitted in compliance with the first protocol to the transmission channel connecting the measuring unit specified by the host and the converter.

Signal conversion system and signal conversion method

This current measurement device includes a conductor, a first terminal block, a pair of detection coils and a current calculator. A magnetic field, proportional to the magnitude of a conducted to-be-measured current, is generated around the conductor. The first terminal block has a placement surface on which the conductor is disposed. The pair of detection coils has the configuration, connected in series and in opposite polarities, and disposed on the placement surface of the first terminal block such that the conductor is between the pair of detection coils, and each coil is spaced from the conductor by an insulating distance. The detection coils output an inductive voltage signal produced by the magnetic field generated by the conductor and an external magnetic field which is magnetic noise. A current calculator calculates the value of the to-be-measured current on the basis of the inductive voltage signals from the pair of detection coils.

Current measurement device and current calculation method

A power measurer measures, for each current transformer CT, electric energy supplied to equipment or electric energy supplied from the equipment based on a current measured by a current measurer and a voltage measured by a voltage measurer. A sign memory stores, for each current transformer CT, information indicating whether the electric energy measured by the power measurer when the current transformer CT is disposed in a correct direction on a power line shows a positive sign or a negative sign. A determiner determines that, when the sign stored in the sign memory differs from the sign of the electric energy measured by the power measurer, the current transformer CT is disposed in an incorrect direction on the power line.

Power measurement device, determination method, and recording medium for identification of current detection element disposed in an incorrect direction

A power supply device is responsive to load changes. The power supply device includes a switch control circuit, a charge control circuit, and a discharge control circuit. The switch control circuit controls switches so that electrical power is charged into an inductor, discharged from the inductor, and distributed to first and second capacitors in a time-division manner based on a switching cycle. The charge control circuit controls the amount of electrical power to be charged into the inductor based on a first amount of error between a first output power supply voltage and its target value and a second amount of error between a second output power supply voltage and its target value. The discharge control circuit controls a distribution ratio at which the electrical power discharged from the inductor is distributed to the first and second capacitors based on the ratio between the first and second amounts of error.

Power supply device with shared inductive elements under switch control

A voltage/current verifier computes, for each phase, a phase difference between phase voltage and phase current from the phase of phase voltage and the phase of phase current computed for each phase by a phase acquirer, and determines conformity if all of the computed phase differences are within a preset range. A current/current verifier computes phase differences between phase currents from the phase of phase current computed for each phase by the phase acquirer, and determines conformity if all of the computed phase differences are less than 180&#xb0;. A reporting device reports that a current transformer is incorrectly placed on a power line unless both the voltage/current verifier and the current/current verifier do not determine conformity.

Device, method and program for determining misplacement of a current transformer on a power line

A presence detection system is equipped with a transmitter that transmits a multipath wireless signal and a receiver that detects the presence of a person by receiving the transmitted wireless signal, within a prescribed space. On the basis of the reception level for a wireless signal received intermittently at the beginning of a first interval, the receiver determines whether there has been a change in the present/absent state of a person. When it is determined that there has been a change in the present/absent state of a person, the receiver determines whether a person is present/absent on the basis of variation in the reception level for a wireless signal received at the beginning of a second interval, which is shorter than the first interval.

Presence detection system, presence detection method, and program

An electric field intensity measuring circuit measures the electric field intensity of each of multiple communication channels available for data communication. A channel determiner compares electric field intensities measured by an electric field intensity measuring circuit with multiple different thresholds including a first threshold as the carrier sense threshold and a second threshold that is the detrimental interference level the interference of which causes the reception sensitivity to deteriorate, counts the numbers of times that the electric field intensity exceeds the thresholds on each communication channel, and selects a communication channel for use based on the counted numbers of times that the thresholds have been exceeded on the communication channels.

Growing community of inventors

Tokyo, Japan

Masahiro Ishihara