| 摘要 |
An uninterruptable power supply in which, even if the consumed electric power of a load is increased, the voltage of a D.C. intermediate circuit is not decreased below a set voltage and the input electric power from an A.C. power source is limited to no more than a set value. The uninterruptable power supply includes: a rectifier for converting an alternating current into a direct current; an inverter for converting the direct current into an alternating current output to a load; a stepup/stepdown chopper for charging batteries and for discharging the batteries; a service interruption detector for detecting the service interruption of the A.C. power source; and a control circuit for operating the stepup/stepdown chopper as a stepdown chopper during non-interruption to charge the batteries, and as a boosting chopper to supply direct current with the batteries as the D.C. power source, wherein, when the input electric power exceeds a limit, the stepup/stepdown chopper operates as the boosting chopper to supply electric power from the batteries, reducing the electric power input from the A.C. power source.
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