Panasonic Intellectual Property Management Co., Ltd.

Takahiro Ohori

Kazunori Kidera

Tatsuo Koga

Manabu Yanagihara

Masanobu Murakami

Takahiro Fukui

Kazuya Ohshima

Keita Kanamori

Hideki Tamura

Hiroto Yamagiwa

Ayanori Ikoshi

Yusuke Tanji

Shingo Okaura

Chikashi Hayashi

A power distribution system includes: a power distribution network that includes one or more connections to which a load is connectable; and a plurality of power supplies capable of supplying power to the power distribution network. Power is supplied to the power distribution network from at least one power supply of the plurality of power supplies. Adjacent power supplies included in the plurality of power supplies are arranged with a gap therebetween, and a connection included in the one or more connections is positioned in the gap.

Power distribution system

An arc detection device includes an obtainer and a determiner. The obtainer obtains a measurement result for a voltage applied to one target power supply line among a plurality of power supply lines to which power is supplied from a DC power source. The determiner determines, based on a component of a specific frequency band in the measurement result for the voltage obtained by the obtainer, whether there is a possibility of an arc fault occurring in the plurality of power supply lines.

Arc detection device, arc detection system, arc detection method, and recording medium

An arc detection system includes an obtainer and a determiner. The obtainer obtains a measurement result for current flowing in a power supply line to which power is supplied from a DC power source. The determiner determines, based on a component of a specific frequency band in the measurement result for the current obtained by the obtainer, whether an arc fault has occurred. The determiner determines that the arc fault has occurred when a specific time for which the component of the specific frequency band is at least a threshold is longer than an occurrence time in which an arc can occur when a device is attached to or detached from the power supply line.

Arc detection system, arc detection method, and recording medium

A contactless power feeding system includes: a primary circuit for supplying primary power to a power feeding coil; and a primary control circuit for controlling the primary circuit. The primary control circuit acquires, from a secondary control circuit, a secondary measured value and a secondary target value of secondary power received by a power receiving coil. The primary control circuit performs control processing and update processing alternately and repeatedly. The control processing is processing of controlling the primary circuit to bring the primary measured value into conformity with a primary target value. The update processing is processing of updating the primary target value. The update processing includes processing of calculating the primary target value based on transfer efficiency to be determined by the primary measured value and the secondary measured value and on the secondary target value.

Contactless power feeding system and contactless power transfer system

In a power supply, a first output terminal and a second output terminal are electrically connected to each other, and a first common terminal and a second common terminal are electrically connected to each other. When a value of a consumption current of a motor is equal to or smaller than a value of a maximum output current of a second constant voltage circuit, the second constant voltage circuit keeps a second voltage at a steady voltage value. When the value of the consumption current of the motor is larger than the value of the maximum output current, the second constant voltage circuit control the second voltage to have a value smaller than a value of the first voltage, and a first constant voltage circuit supplies a differential current which corresponds to a difference between the consumption current of the motor and the maximum output current of the second constant voltage circuit.

Power supply, lamp, and vehicle

A lighting device includes an output adjustment circuit, a smoothing circuit and a control circuit. The smoothing circuit receives a binary rotation detection signal according to the rotation of a fan and smooths the rotation detection signal to produce a smoothed signal. The control circuit detects a rotation malfunction of the fan when the smoothed signal is greater than or equal to an upper limit threshold over first predetermined time or when the smoothed signal is smaller than or equal to a lower limit threshold over second predetermined time.

Power supply, lighting device, headlight device and vehicle

A semiconductor device includes: a first bidirectional switch element including a first gate electrode, a second gate electrode, a first electrode, and a second electrode; a first field-effect transistor including a third gate electrode, a third electrode, and a fourth electrode; and a second field-effect transistor including a fourth gate electrode, a fifth electrode, and a sixth electrode. The first electrode is electrically connected to the third gate electrode, the first gate electrode is electrically connected to the third electrode, the second electrode is electrically connected to the fourth gate electrode, the second gate electrode is electrically connected to the fifth electrode, and the fourth electrode is electrically connected to the sixth electrode.

Semiconductor device

A semiconductor device includes: a first semiconductor layer stacked body including a compound semiconductor; a first field-effect transistor element including a first drain electrode, a first source electrode, and a first gate electrode that are provided on the first semiconductor layer stacked body; a second semiconductor layer stacked body including a compound semiconductor; and a second field-effect transistor element including a second drain electrode, a second source electrode, and a second gate electrode that are provided on the second semiconductor layer stacked body. The second gate electrode forms a Schottky junction or a p-n junction with the second semiconductor layer stacked body, the second drain electrode is connected to the first drain electrode, the second source electrode is connected to the first gate electrode, and the second gate electrode is connected to the first source electrode.

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Osaka, Japan

Takahiro Ohori