Patent ID: 9077201
Filing Date: 2015-07-07
Classification: G06F,H02J

Abstract:
1. An uninterruptible power supply device comprising: a converter that converts first ac power from a commercial ac power supply into first dc power; an electric double-layer capacitor that stores the first dc power; an inverter that converts the first dc power from said converter and said electric double-layer capacitor into second ac power; a rectifier circuit that converts said second ac power into second dc power; and a charging circuit that supplies output power of said rectifier circuit to said electric double-layer capacitor at a first startup of said inverter, and that selectively supplies output power of one of said converter and said rectifier circuit to said electric double-layer capacitor at second and subsequent startups of said inverter, wherein at the second and subsequent startups of said inverter, said charging circuit supplies the output power of said rectifier circuit to said electric double-layer capacitor in a first case when a charge level of said electric double-layer capacitor is lower than a predetermined threshold level, and supplies the output power of said converter to said electric double-layer capacitor in a second case when the charge level of said electric double-layer capacitor is higher than said predetermined threshold level.