Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2006-03-31
2009-02-10
Han, Jessica (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S222000, C323S284000
Reexamination Certificate
active
07489121
ABSTRACT:
A PWM control circuit for a voltage regulator including a compensation network, a ramp generator providing a ramp voltage, an offset adjust circuit and a comparator circuit. The compensation network senses the output voltage, receives a reference voltage, and outputs a compensation voltage. The offset adjust circuit adjusts a selected one of the ramp voltage and the compensation voltage based on the reference voltage. The comparator circuit compares the compensation voltage with the ramp voltage and provides a PWM signal for controlling the output voltage. The offset adjust circuit may generate an offset voltage based on the reference voltage and a gain G of the voltage regulator. The offset adjust circuit may subtract the offset voltage from either the ramp voltage or the compensation voltage to provide an adjusted voltage to the comparator circuit.
REFERENCES:
patent: 5689176 (1997-11-01), Deloy
patent: 6522115 (2003-02-01), Greitschus
patent: 7038514 (2006-05-01), Leith et al.
patent: 7135841 (2006-11-01), Tomiyoshi et al.
patent: 2007/0013356 (2007-01-01), Qiu et al.
Isham Robert H.
Liang Zhixiang
Qiu Weihong
Han Jessica
Intersil America's Inc.
Stanford Gary R.
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