Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Reexamination Certificate
2006-12-12
2006-12-12
Feild, Lynn (Department: 2835)
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
C307S066000, C330S251000
Reexamination Certificate
active
07148586
ABSTRACT:
A sine wave generation circuit and an uninterruptible power supply system (UPS) using the same, and more particularly, a sine wave generation circuit and a UPS using the same, which can output a sine wave for direct current (DC) power from a battery. In the UPS, a rectifier rectifies commercial alternating current (AC) power from an input terminal and converts the AC power into DC power. A charger charges a battery with the DC power. The battery provides the DC power. A DC-DC converter boosts and/or drops the DC power inputted from the battery by a predetermined level of the AC power. A D-class amplifier receives the DC power from the DC-DC converter and outputs a sine waveform power signal in response to a waveform control signal. A sine waveform controller controls a sine waveform generation operation of the D-class amplifier. A switching unit switches the commercial AC power from the input terminal to a load in a normal mode, and switches the sine waveform power signal from the D-class amplifier to the load when an error of the commercial AC power is detected.
REFERENCES:
patent: 6175311 (2001-01-01), Li
patent: 6385056 (2002-05-01), Gucyski
patent: 2002/0175750 (2002-11-01), Kim
patent: 2003/0048006 (2003-03-01), Shelter et al.
Lee Dong-Hyang
Lee Yeung-Soo
Cantor & Colburn LLP
Feild Lynn
Rutland-Wallis Michael
World Top Technology Co., Ltd.
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