Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Masakatsu Daijou0
Akira Hatai0
Kiyoshi Eguchi0
Mahito Unno0
Date of Patent
October 7, 2008
0Patent Application Number
105149140
Date Filed
March 17, 2003
0Patent Primary Examiner
Patent abstract
In the inverter device of the invention, when a power source connected to an electrolytic capacitor 5 is interrupted, a switching control circuit 6a controls switching elements of an inverter main circuit 7a to operate to supply a current to a load, thereby discharging charges of the electrolytic capacitor 5, and an electrolytic capacitor electrostatic capacitance calculator 10a calculates 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 5, and a discharge time; and a discharge voltage ΔV which is a voltage drop from beginning of discharging of the electrolytic capacitor 5.
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