Mitsubishi Denki Kabushiki Kaisha

Takahiro Ishigami

Hiroaki Suzuki

Makoto Tanikawa

Isao Kawasaki

Hitoshi Tanifuji

Yoshihiro Iwasaki

Yoshihiko Kikkawa

Masahito Mori

Ichiro Minejima

Provided are, a converter section ( ) which converts a commercial AC voltage (V ) into a DC voltage (V ); an inverter section ( ) which converts the DC voltage (V ) into an output AC voltage (V ) of a predetermined frequency by a pulse-width modulation system based on an assigned PWM width, and supplies the output AC voltage (V ) to a compressor motor ( ). Further, an instantaneous DC voltage detecting section ( ) detects an instantaneous DC voltage (V ); and an arithmetic processing section ( ) corrects the PWM width so as to maintain the output AC voltage (V ) at a desired value following the variation in the instantaneous DC voltage (V ). It is possible to operate a compressor motor ( ) in an optimum state of load characteristics and efficiency.

Inverter control apparatus

An apparatus which secures a heat sink to an electrical component connected to a circuit board, including a first outer cover which engages a portion of the heat sink and a portion of the circuit board. In addition, the first outer cover encloses the electrical component, and the electrical component has at least two pins, a first surface facing the circuit board, and a second surface facing the heat sink. Further, a majority of heat dissipating surfaces of the heat sink are outside a space enclosed by the first outer cover and the circuit board.

Power transistor module packaging structure

Growing community of inventors

Tokyo, Japan

Takahiro Ishigami