| 摘要 |
PROBLEM TO BE SOLVED: To provide an energy storage device that uses an electric double-layer capacitor, capable of completely and safely performing equalizing charge, using a relatively simple circuit configuration. SOLUTION: The device includes a capacitor bank 1 which is formed by connecting m units of electric double-layer capacitors in parallel and connecting them in series in n stages, an energy conversion device 2 which is connected to an AC power supply and can control rapid charging/discharging of the capacitor bank 1, an equalizing charge assist device 3 which applies anequalizing voltage to each series stage of the capacitor bank 1, and a voltage detecting device 5 which detects the voltage in each series stage of the capacitor bank 1. The capacitor bank 1 is charged by the energy conversion device 2, when all the detected values of the voltage detecting device 5 are a predetermined value or lower; and the capacitor bank 1 is charged by the equalizing charge assist device 3, when at least one of the detected values of the voltage detecting device 5 exceeds the predetermined voltage value. COPYRIGHT: (C)2008,JPO&INPIT
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