Mitsubishi Electric Corporation

Masato Handa

Koichi Arisawa

Yosuke Shinomoto

Mitsuo Kashima

Makoto Tanikawa

Norikazu Ito

Takuya Shimomugi

Kazunori Sakanobe

Shigeo Umehara

Katsuhiko Saito

Hideki Takahara

Tomomi Higashikawa

Hitoshi Tanifuji

Futoshi Okawa

A current detection device for detecting an electric current flowing through an inverter, an overcurrent level generation device for generating an abnormality judgment reference value, an overcurrent detection device for generating an interruption signal to the inverter on the basis of an output of the current detection device and the abnormality judgment reference value, and an adjusting apparatus for correcting the abnormality judgment reference value of the overcurrent level generation device on the basis of the output at a time when a constant electric current is applied to the current detection device are provided. The overcurrent level generating device is provided with one or a plurality of resistance value adjusting sections, and generates the abnormality judgment reference value in correspondence to a resistance value of the resistance value adjusting section. The adjusting apparatus performs a zapping operation by means of applying a reverse-bias to a zener diode, and corrects the abnormality judgment reference value.

Overcurrent detection circuit, inverter, compressor, and air-conditioning machine, and adjusting method for adjusting overcurrent detection circuit

A power converter includes step-up means for varying a voltage applied by a power supply to a predetermined voltage, commutating means for performing a commutation operation for allowing a current flowing through the step-up means to flow through a second path, smoothing means for smoothing a voltage related to outputs of the step-up means and the commutating means to produce power and supplying the power to a load side, and control means for performing control related to voltage varying, such as stepping up, by the step-up means and controlling the commutation operation of the commutating means on the basis of at least one of a voltage and a current related to the step-up means.

Power converter and refrigerating and air-conditioning apparatus

A rectifier connected with an AC source through a reactor, a plurality of capacitors connected in series between output terminals of the rectifier, first switching means connected between one input terminal of the rectifier and a connection point of a plurality of capacitors, second switching means connected between the other input terminal of the rectifier and the connection point of a plurality of capacitors, and a plurality of diodes connected with the plurality of capacitors in inverse-parallel are provided.

AC-DC converter, method of controlling the same, motor driver, compressor driver, air-conditioner, and heat pump type water heater

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Tokyo, Japan

Masato Handa