TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
대리인 / 주소
Oblon, McClelland, Maier & Neustadt, L.L.P.
인용정보
피인용 횟수 :
0인용 특허 :
4
초록▼
An uninterruptible power supply device including a rectifier circuit rectifying output power of an inverter. At a first startup of the inverter, output power of the rectifier circuit is supplied to an electric double-layer capacitor. At second and subsequent startups of the inverter, output power of
An uninterruptible power supply device including a rectifier circuit rectifying output power of an inverter. At a first startup of the inverter, output power of the rectifier circuit is supplied to an electric double-layer capacitor. At second and subsequent startups of the inverter, output power of one of a converter and the rectifier circuit is selectively supplied to the electric double-layer capacitor. Therefore, by controlling the inverter, the electric double-layer capacitor can be precharged easily with a simple configuration.
대표청구항▼
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 do
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; anda 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. 2. The uninterruptible power supply device according to claim 1, wherein said charging circuit determines that the charge level of said electric double-layer capacitor is lower than said predetermined threshold level when a power interruption time of said commercial ac power supply is longer than a predetermined time, and determines that the charge level of said electric double-layer capacitor is higher than said predetermined threshold level when the power interruption time of said commercial ac power supply is shorter than said predetermined time. 3. The uninterruptible power supply device according to claim 1, wherein said charging circuit determines that the charge level of said electric double-layer capacitor is lower than said predetermined threshold level when a voltage across terminals of said electric double-layer capacitor is lower than a predetermined voltage, and determines that the charge level of said electric double-layer capacitor is higher than said predetermined threshold level when the voltage across the terminals of said electric double-layer capacitor is higher than said predetermined voltage. 4. The uninterruptible power supply device according to claim 1, further comprising a switch circuit that receives said first ac power and said second ac power to supply said second ac power to a load in response to termination of said first startup of said inverter, and where a power interruption of said commercial ac power supply occurs, said switch circuit supplies said first ac power to said load in said first case and supplies said second ac power to said load in said second case. 5. The uninterruptible power supply device according to claim 1, further comprising a soft-start circuit that increases an output voltage of said inverter to a target voltage at a first speed at said first startup of said inverter, and increases the output voltage of said inverter to the target voltage at a second speed faster than said first speed at said second and subsequent startups of said inverter. 6. The uninterruptible power supply device according to claim 5, further comprising a current detection circuit that detects an output current of said rectifier circuit, wherein said soft-start circuit increases the output voltage of said inverter at one of said first speed and said second speed when a detection value of said current detection circuit is lower than a predetermined threshold current, and temporarily stops increasing the output voltage of said inverter when the detection value of said current detection circuit is higher than said predetermined threshold current. 7. The uninterruptible power supply device according to claim 4, further comprising a transformer that receives said second ac power and outputs said second ac power to said switch circuit. 8. The uninterruptible power supply device according to claim 7, further comprising a capacitor connected to an output of said transformer to remove noise from said second ac power. 9. The uninterruptible power supply device according to claim 1, wherein an output of said inverter is connectable to an input of a load and connected to an input of said rectifier circuit. 10. The uninterruptible power supply device according to claim 1, wherein an output of the commercial ac power and an output of said inverter are connectable to an input of a load. 11. The uninterruptible power supply device according to claim 1, wherein an input of said double-layer capacitor is connected to an output of said rectifier circuit and an output of said converter. 12. The uninterruptible power supply device according to claim 1, wherein said electric double-layer capacitor is directly connected to an output of said converter and an input of said inverter. 13. A method for supplying uninterruptible power comprising: converting, using a converter, first ac power from a commercial ac power supply into first dc power;storing, in an electric double-layer capacitor, said first dc power;converting, using an inverter, said first dc power from said converter and said electric double-layer capacitor into second ac power;converting, using a rectifier circuit, said second ac power into second dc power; andsupplying, using a charging circuit, output power of said rectifier circuit to said electric double-layer capacitor at a first startup of said inverter, and selectively supplying, using the charging circuit, 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, supplying 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 supplying 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. 14. The method for supplying uninterruptible power according to claim 13, wherein said electric double-layer capacitor is directly connected to an output of said converter and an input of said inverter.
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이 특허에 인용된 특허 (4)
Nozu,Ryutaro; Nakamura,Mami, Electric double layer capacitor, control method thereof, and energy storage system using the same.
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