Denso Corporation

Fan Wang

Yoshie Sugiura

Yuukou Murase

Akira Takaoka

Hirokazu Ooyabu

Hideaki Ishihara

Atsushi Kobayashi

Masakiyo Horie

Tomonori Kimura

Hironobu Akita

In a communication system, nodes are coupled to a transmission path in a bus topology. The nodes communicate with each other via the transmission path using communication signals that have a communication frequency and are synchronized with a power supply signal. Each of the nodes includes a coupling portion that transmits and receives the communication signal and the power supply signal using electromagnetic induction in non-contact with the transmission path. Each of the nodes determines whether a collision of the communication signals occurs on the transmission path based on a voltage level of a signal that has the communication frequency and is induced at the coupling portion.

Communication system

In a master apparatus, a reference device generates a reference signal, a power feeding signal generation portion divides or multiples a frequency of the reference signal to generate a power feeding signal, a first communication carrier generation portion divides or multiples the frequency of the reference signal to generate a first communication carrier, a communication signal generation portion generates a communication signal, and a superimposition portion superimposes the communication signal on the power feeding signal. In a slave apparatus, a separation portion separates the superimposition signal into a power feeding signal and a communication signal, a second communication carrier generation portion divides or multiples a frequency of the power feeding signal separated by the separation portion to generate a second communication carrier, and a modulation and demodulation portion modulates and demodulates a data communication signal to be communicated with the master apparatus using the second communication carrier.

Vehicular power line communication system and slave apparatus

In a power line communication system, a master uses a twisted pair wire as a power line and a communication line and outputs a power signal and a data modulation signal to a slave. The slave includes an aperture antenna, a power monitoring portion, and a determining portion. The aperture antenna receives the power signal via the twisted pair wire by electromagnetic induction coupling of an electromagnetic field generated at the twisted pair wire in accordance with an applied current of the twisted pair wire. The aperture antenna has an aperture region facing an aperture region between twists of the twisted pair wire. The power monitoring portion monitors a power of the power signal received via the first aperture antenna. The determination portion determines whether to use another operation power received via the twisted pair wire on the basis of the power monitored by the power monitoring portion.

Power line communication system for vehicle

A vehicular power line communication system includes a looped twisted pair wire, a master, and a slave. The master outputs a high-frequency signal to the twisted pair wire to transmit power and a signal. The slave includes a looped aperture antenna that receives high-frequency power of the twisted pair wire and a received power measurement portion that monitors received power received at the aperture antenna. The aperture antenna includes an aperture region facing an aperture region between twisted portions of the twisted pair wire.

Power line communication system

A vehicular power line communication system includes a master and a slave. The master uses a pair of twisted wires, whose far ends are connected to each other to be loop-shaped, as a power line and a communication line. The master thereby outputs high-frequency signals via the pair of twisted wires, transmitting an electric power and data modulation signals. The slave includes an aperture antenna being loop-shaped to receive data modulation signals using an electromagnetic induction connection in an electromagnetic field generated in the pair of twisted wires in response to an energization current of the pair of twisted wires. The slave further includes an error rate monitor circuit which monitors an error rate of data which are obtained from demodulation of the data modulation signals received via the aperture antenna.

Vehicular power line communication system

A power conversion apparatus includes main circuits, in which switching elements are connected in parallel with diodes, respectively. An auxiliary circuit, which is formed of a series-connected second switching element and a capacitor, is connected in parallel with the diode operating as a freewheeling diode. The switching element of the main circuit, which is opposite to the auxiliary circuit, is set to turn on at a reference time. The second switching element of the auxiliary circuit is set to turn on in advance of the reference time by an interval of a discharging time period of the capacitor in a dead time period.

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Nagoya, Japan

Fan Wang