Apparatus having plural electric double layer capacitors and method for adjusting voltages of the capacitors

摘要

An electric double layer capacitor apparatus including a plurality of electric double layer capacitors connected in series, at least one set of a voltage detection device and a discharge device, and a controller. The at least one set is provided to at least one of the plurality of electric double layer capacitors. The voltage detection device is configured to detect a terminal voltage of the at least one of the plurality of electric double layer capacitors. The controller is configured to stop charging the plurality of electric double layer capacitors when the terminal voltage detected by the voltage detection device reaches a maximum charge voltage. The discharge device is configured to discharge the at least one of the plurality of electric double layer capacitors such that said terminal voltage drops toward a predetermined target voltage which is lower than the maximum charge voltage when the terminal voltage is higher than the predetermined target voltage, and the discharge device is configured not to discharge through the load the at least one of the plurality of electric double layer capacitors when the terminal voltage is equal to or lower than the predetermined target voltage.