Mitsubishi Denki Kabushiki Kaisha

Masakatsu Daijou

Kiyoshi Eguchi

Mahito Unno

Akira Hatai

In the inverter device of the invention, when a power source connected to an electrolytic capacitoris interrupted, a switching control circuitcontrols switching elements of an inverter main circuitto operate to supply a current to a load, thereby discharging charges of the electrolytic capacitor, and an electrolytic capacitor electrostatic capacitance calculatorcalculates the electrostatic capacitance of the electrolytic capacitor, on the basis of: a discharged charge amount which is obtained from an outflow current Ic from the electrolytic capacitor, and a discharge time; and a discharge voltage &#x394;V which is a voltage drop from beginning of discharging of the electrolytic capacitor

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Tokyo, Japan

Masakatsu Daijou