Title:
UNINTERRUPTED POWER SUPPLY
Document Type and Number:
Japanese Patent JP3599070
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce the voltage fluctuation in AC power to be supplied to a load by supplying AC power directly or after rectification with DC power overlapped during commercial feeding and by supplying AC power to the load from a backup circuit through a rectifying circuit and switching circuit during power interruption.
SOLUTION: When the commercial power supply voltage during commercial feeding is within an allowable range, a switching circuit 8 and a control switch 9 are controlled so as to output the AC power from the commercial power supply through a control switch 9. If the commercial voltage exceeds the allowable range, then the switching circuit 8 and the control switch 9 are controlled so as to overlap the output of the switching circuit 8 to the AC power. At the time of power interruption, AC power from an AC backup circuit 10 is input to a rectifying circuit 7, the control switch 9 and the switching circuit 8. In this way, AC power with less voltage fluctuation can be supplied to a load 6.
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Inventors:
Makoto Sakane
Application Number:
JP28267495A
Publication Date:
December 08, 2004
Filing Date:
October 31, 1995
Export Citation:
Assignee:
Yuasa Corporation
International Classes:
H02J9/06; G05F1/00; H02M7/48; (IPC1-7): H02J9/06; G05F1/00; H02M7/48
Domestic Patent References:
| JP4042740A | ||||
| JP4340337A |