| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce a noise emitted due to an operation of an inverter by deactivating the operation of the inverter during the normal operation. <P>SOLUTION: An instantaneous voltage drop compensator is provided with an auxiliary charger 6 including a transformer 61 and a rectifying diode 63, in addition to the inverter 4 for charging an electrolytic capacitor 51 in an electrical storage section 5. A control unit 10 controls operations of the inverter 4 and the auxiliary charger 6 based on an actual charging voltage detected by a charging voltage detector 13. If the charging voltage is low and a fast charge is required, the inverter 4 operates. When the charging voltage is gradually reduced to a defined value by a natural discharge after the charging voltage reaches a rated voltage, the inverter 4 dose not operate, and the auxiliary charger 6 operates so as to charge and compensate the reduced voltage. The inverter 4 hardly operates during the normal operation. <P>COPYRIGHT: (C)2008,JPO&INPIT |
