Mitsubishi Denki Kabushiki Kaisha

Akira Hatai

Kei Terada

Kiyoshi Eguchi

Mahito Unno

Yuji Nishizawa

Masakatsu Daijou

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

Inverter device

The present invention provides a variable-speed control system which is capable of estimating saturation voltages of respective switching elements in the inverter operation to execute the saturation voltage compensation and thus getting an inverter output voltage indicated by a command value.

Growing community of inventors

Tokyo, Japan

Akira Hatai