US 5,856,712 AGranted

Uninterruptible power supply method

AssigneesI-Hits Laboratory, Chiyoda Corporation

InventorsYasunobu Suzuki, Isao Sugawara

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Abstract

A method for providing an uninterruptible power supply to a load both at ordinary times and in an emergency. At ordinary times, commercial AC input power is modulated into high-frequency AC power, which is then applied to a primary winding of a high-frequency transformer having the primary winding, a secondary winding and a tertiary winding. High-frequency AC power induced in the secondary winding from the primary winding is demodulated into AC output power, which is then supplied to the load. High-frequency AC power induced in the tertiary winding from the primary winding is rectified into DC power, with which a storage battery is charged. In an emergency, DC power from the storage battery is converted into high-frequency AC power, which is then applied to the tertiary winding. High-frequency AC power induced in the secondary winding from the tertiary winding is averaged, thereby producing AC output power, then the AC output power is supplied to the load.

Claims35

Dependent claims

A method of providing an uninterruptible supply of power to a load during an ordinary times mode and in an emergency mode, said method comprising, during the ordinary times mode, the steps of:

modulating commercial AC input power into high-frequency AC power;
applying the high-frequency AC power to a primary winding of a high-frequency transformer having the primary winding, a secondary winding and a tertiary winding;
demodulating high-frequency AC power induced in the secondary winding from the primary winding into AC output power which is approximately equivalent to the commercial AC input power and has a waveform similar to that of the commercial AC input power;
supplying the AC output power to the load;
rectifying high-frequency AC power induced in the tertiary winding from the primary winding into DC power;
and
charging a storage battery with the DC power;
and said method further comprising, during the emergency mode, the steps of:
converting DC power from the storage battery into high-frequency AC power;
applying the high-frequency AC power to the tertiary winding;
averaging high-frequency AC power induced in the secondary winding from the tertiary winding, thereby producing AC output power;
and
supplying the AC output power to the load.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/838,052Filed 22 Apr 1997
Priority: JP 8-3257715 Dec 1996
Granted: 5 Jan 1999
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H02J 9/062
With automatic change-over , e.g. UPS systems: for AC powered loads
H02M 7/21
Using discharge tubes with control electrode or semiconductor devices with control electrode: using devices of a triode or transistor type…
H02J 9/067
With automatic change-over , e.g. UPS systems: using multi-primary transformers, e.g. transformer having one primary for each AC energy source and…
H02M 7/4807
Using discharge tubes with control electrode or semiconductor devices with control electrode: having a high frequency intermediate AC stage