Patent ID: 7546057
Filing Date: 2009-06-09
Classification: G03G,H02J

Abstract:
1. A capacitor power supply unit comprising: a capacitor group in which a plurality of capacitors are serially connected to each other; a voltage detector that detects an output voltage of the capacitor group; a charger that charges the capacitor group; a plurality of monitor units that are connected in parallel to the capacitors in the capacitor group, respectively, that bypass a charging current when a voltage of each of the capacitors reaches a predetermined voltage, and generate a reaching signal indicating reaching to the predetermined voltage; and a charge controller that sets a long-time time limit if the output voltage is lower than a first value, when the reaching signal is generated, and sets a short-time time limit if the output voltage is higher than the first value, starts counting time, and stops charging performed by the charger after the time limit elapses.