Panasonic Intellectual Property Management Co., Ltd.

Panasonic Electric Works Co., Ltd.

Atsushi Okita

Yoshifumi Watabe

Tatsuo Koga

Masanori Hayashi

Mitsuru Kaji

Hirotaka Matsunami

Kentaro Nomura

Satoshi Sugino

Osamu Akasaka

Satosi Sugino

An arc detection circuit includes a current detector and arc determination unit. The current detector detects a current flowing through a transmission line which connects an electric power supply device and an electric power conversion circuit. The arc determination unit calculates, from a result of measurement of the current, an area of interest and an area for comparison. The area of interest is an area of a region of interest defined by a predetermined frequency range and predetermined time for determination. The area for comparison is an area of a portion in which detected strength exceeds a predetermined strength threshold in the region of interest. The arc determination unit determines an electric arc has occurred when a ratio between the area of interest and the area for comparison exceeds a predetermined area-ratio threshold.

Arc detection circuit, breaker system, connection box system, power conditioner, micro inverter, DC optimizer, and arc detection method

In an arc detector, a frequency analyzer analyzes frequency components of a current subject to detection in a first frequency band. A detector detects an occurrence of an arc by referring to the frequency components in the first frequency band. When the detector does not detect the occurrence of an arc by referring to the frequency components in the first frequency band, the frequency analyzer analyzes frequency components of the current subject to detection in a second frequency band lower than the first frequency band, and the detector detects the occurrence of an arc by referring to the frequency components in the second frequency band.

Arc detection device and arc detection method

A radio receiving apparatus of the present invention is for receiving a radio signal having pulsating signals occurring at specific periods, wherein the radio receiving apparatus corrects signal levels received during communication in individual regions into which each of the aforementioned periods is divided based on signal levels received in the individual regions under conditions where the radio signal is not received. As a result of this correction, the radio receiving apparatus of the present invention can decrease the influence of noise having periodicity and improve reliability of communication.

Radio receiving apparatus and radio receiving method

Growing community of inventors

Osaka, Japan

Atsushi Okita