Power circuit applying AC voltage and DC voltage to...

Details Power circuit applying AC voltage and DC voltage to... Power circuit applying AC voltage and DC voltage to...

2004-10-28

2009-08-18

Lefkowitz, Sumati (Department: 2629)

Computer graphics processing and selective visual display system

Display driving control circuitry

Reexamination Certificate

active

07576735

ABSTRACT:
A power circuit outputs and applies an AC voltage and a DC voltage to respective terminals of a capacitor, so as to obtain an AC output voltage shifted in accordance with the DC voltage component. The power circuit comprises a first voltage adjuster for outputting an AC voltage and a first DC voltage, and a second voltage adjuster for outputting a second DC voltage. For a predetermined duration after turning on power, the power circuit supplies the first DC voltage from the first voltage adjuster and the second DC voltage from the second voltage adjuster, for application to respective terminals of the capacitor. After the predetermined duration has passed, the power circuit changes the voltage output from the first voltage adjuster to the AC voltage, and supplies the AC voltage and the second DC voltage for application to the respective terminals of the capacitor. With this arrangement, a required potential can be quickly achieved at the time of turning on power.

REFERENCES:
patent: 5789871 (1998-08-01), Shen et al.
patent: 5929847 (1999-07-01), Yanagi et al.
patent: 2002/0027551 (2002-03-01), Nitta et al.
patent: 2002/0190938 (2002-12-01), Yamada
patent: 2000-81606 (2000-03-01), None
English Patent Abstract of 2000-18606 from esp@cenet.
U.S. Office Action issued in U.S. Appl. No. 10/928,777 mailed on Jul. 18, 2007, 11 pages.

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