Switching regulator with frequency modulation to vary...

Details Switching regulator with frequency modulation to vary... Switching regulator with frequency modulation to vary...

2007-02-13

2007-02-13

Easthom, Karl (Department: 2838)

Electricity: power supply or regulation systems

External or operator controlled

Using a three or more terminal semiconductive device as the...

C323S222000, C323S282000

Reexamination Certificate

active

11052111

ABSTRACT:
In a frequency modulation type switching regulator for producing an output voltage to a load, an error amplifier produces an error voltage indicative of a difference between the output voltage and a reference voltage. A switching device is turned on and off at a switching frequency corresponding to the error voltage. A voltage-frequency modulation circuit monitors an operation condition of the load. The modulation circuit generates a varying voltage, which varies around the error voltage, when the monitored operation condition is substantially unchanged. The switching frequency is switched to another frequency corresponding to the varying voltage, so that noise level may be reduced.

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patent: 2005/0052249 (2005-03-01), Gan et al.
patent: A-2003-153526 (2003-05-01), None

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