Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2007-05-29
2007-05-29
Patel, Rajnikant B. (Department: 2838)
Amplifiers
Modulator-demodulator-type amplifier
C330S251000, C327S132000
Reexamination Certificate
active
11165637
ABSTRACT:
A pre-charge apparatus and method for controlling startup transients in a capacitively-coupled switching power stage provide lower cost and improved startup transient performance in Class D amplifiers, as well as in other AC power converter applications. A charging source is activated at startup to control the charging of an external capacitor from a single power supply rail to an operating point voltage equal to the average DC output of the switching circuit, while a control circuit disables the output power stage of the switching converter. The current source may be a constant-current source and/or may be controlled via feedback from the voltage or current at the output terminal of the converter to taper the current level to more accurately control the charging. A discharge circuit can also be provided to discharge the output terminal to an opposite power supply rail before commencing the controlled charging.
REFERENCES:
patent: 5642076 (1997-06-01), Naokawa et al.
patent: 6385056 (2002-05-01), Gucyski
patent: 6525517 (2003-02-01), Hojo et al.
patent: 6538590 (2003-03-01), Gaborieau et al.
patent: 6573787 (2003-06-01), Ikin
patent: 6775164 (2004-08-01), Wong et al.
Gaboriau Johann
Jiang Jiandong
Melanson John L.
Zhang Lingli
Cirrus Logic Inc.
Harris Andrew M.
Mitch Harris Atty at Law, LLC
Patel Rajnikant B.
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