Mitsubishi Electric Corporation

Mitsubishi Electric Lighting Corporation

Mamoru Kamikura

Kazunori Sakanobe

Keita Takahashi

Nobuyuki Haruna

Kodai Katagiri

Kenta Yuasa

Kenji Iwazaki

Takeshi Horiguchi

Ryota Asakura

Ryosuke Kobayashi

Hiroyuki Kimata

Toshiyuki Kuriyama

Koji Rikukawa

Takashi Masuhara

Yasuaki Furusho

Shinsuke Funayama

Norihiko Akashi

Teiji Ohtsu

Takahiro Oishi

Akira Yamagami

A power conversion device supplies power to a load. The power conversion device includes a power conversion unit, a control unit, a noise suppression unit, and an error detection unit. The power conversion unit receives power from a first power source. The control unit controls the power conversion unit. The noise suppression unit is connected between the first power source and the power conversion unit and outputs a noise suppression signal to suppress noise generated from the power conversion unit. When an error condition is established, the error detection unit detects an error. The error condition indicates that the error has occurred in the power conversion device or the load. The error condition includes a condition that an amount of noise generated from the power conversion unit is larger than a reference value.

Power conversion device and air conditioner

a permanent magnet synchronous motor diagnostic device includes: a negative-sequence current calculator that calculates a negative-sequence current, based on magnitudes of a plurality of phase currents flowing through a permanent magnet synchronous motor that rotates a load; and a deterioration diagnoser that diagnoses deterioration of a plain bearing supporting the permanent magnet synchronous motor, based on the negative-sequence current.

Permanent magnet synchronous motor diagnostic device and inverter comprising the same

Provided is a low-cost noise filter having a noise suppression effect that is not reduced even when a resonance frequency changes according to changes in temperature. A noise filter includes: a noise detection unit which detects a common mode noise; a cancellation signal output unit; an injection unit which injects a cancellation signal; and a grounded capacitor. The cancellation signal output unit includes a filter part which generates the cancellation signal from the common mode noise, and an amplification part which amplifies the cancellation signal. A temperature dependence of a product of an inductance value and a capacitance value of a main circuit portion including the noise detection unit, the injection unit, and the grounded capacitor, and a temperature dependence of a product of an inductance value and a capacitance value of the filter part, are equal to each other.

Noise filter

An electronic device according to the present invention includes a power supply unit and a load, the power supply unit including a ground terminal, a rectifier circuit, a circuit section connected to a DC output of the rectifier circuit, the circuit section supplying electric power to the load, a first varistor connected at one end thereof to one input end of the rectifier circuit, a second varistor connected at one end thereof to another input end of the rectifier circuit and connected at another end thereof to another end of the first varistor and an arrester connected at one end thereof to the another end of the second varistor and connected at another end thereof to the ground terminal, wherein an electrostatic capacity of each of the first and second varistors is 40% or more of a sum of earth capacitances of the power supply unit and the load.

Electronic device

A semiconductor device includes a positive electrode-side semiconductor element, a negative electrode-side semiconductor element, a positive electrode plate, a negative electrode plate, an AC electrode plate, a positive electrode-side auxiliary electrode terminal, a negative electrode-side auxiliary electrode terminal, a positive electrode-side capacitor, and a negative electrode-side capacitor. The positive electrode plate is connected to a first positive electrode of the positive electrode-side semiconductor element. The negative electrode plate is connected to a second negative electrode of the negative electrode-side semiconductor element. The AC electrode plate is connected to a first negative electrode of the positive electrode-side semiconductor element and a second positive electrode of the negative electrode-side semiconductor element. The positive electrode-side capacitor is connected to the positive electrode plate and the positive electrode-side auxiliary electrode terminal. The negative electrode-side capacitor is connected to the negative electrode plate and the negative electrode-side auxiliary electrode terminal.

Semiconductor device and power conversion device

Even when a grounding capacitor is included at either end of a common mode coil, there is noise that flows from a load into a metal frame, and there is a need to restrict an amount of noise propagating to a system power supply. Because of this, a noise loop is formed of a rectifier circuit, an inverter, a first electrical wire that connects a positive polarity side of the rectifier circuit and the inverter, a second electrical wire that connects a negative polarity side of the rectifier circuit and the inverter, a ground wire terminal that can connect a load connected to an output terminal or the inverter, and a conductive plate that connects at least one or the first electrical wire and second electrical wire and the ground wire terminal.

Power circuit device

An electronic device includes the memory card connector including a loading opening for the memory card in the side face thereof and has a first sidewall and a second sidewall facing each other, the printed wire board on which a ground is formed, and a resin case having an opening portion, through which the memory card is inserted and formed in the sidewall of the loading opening. On the second main face of the printed wire board, there are formed a first electrode and a second electrode that are connected with the ground, that are disposed on the respective ends thereof at the loading opening side, and that are independent from each other, and the first electrode is disposed below the first sidewall of the memory card connector and the second electrode is disposed below the second sidewall of the memory card connector.

A power semiconductor device includes a first polarity-side semiconductor element whose first principal electrode is in contact with a first polarity-side surface electrode on an insulator plate; a second polarity-side semiconductor element whose first principal electrode is in contact with an intermediate surface electrode on the insulator plate; an intermediate conductor connecting the intermediate surface electrode with a second principal electrode of the first polarity-side semiconductor element; a heatsink being in contact with the insulator plate; a sealing resin sealing the first polarity-side semiconductor element, the second polarity-side semiconductor element, the insulator plate, and the intermediate conductor; a second polarity-side terminal of plate-type connected with a second principal electrode of the second polarity-side semiconductor element and extending externally from the scaling resin; and an adjusting electrode mounted and connected to the heatsink so as to have a surface facing the second polarity-side terminal.

Growing community of inventors

Chiyoda-ku, Japan

Mamoru Kamikura