Patent ID: 7339360
Filing Date: 2008-03-04
Classification: H02M

Abstract:
1. A switching voltage regulator for converting an input voltage into an output voltage, comprising: a first switch; a second switch; an inductor, wherein the first switch, the second switch, and the inductor are coupled together to a switch node, such that when the first switch is turned on and the second switch is turned off, an inductor current flowing through the inductor increases, but when the first switch is turned off and the second switch is turned on, the inductor current decreases; a switch control system for generating a drive signal to control the first switch and the second switch; a duty cycle detecting circuit for detecting a duty cycle of the drive signal, such that when the duty cycle is larger than a predetermined threshold, the duty cycle detecting circuit generates an over-threshold signal, but when the duty cycle is smaller than the predetermined threshold, the duty cycle detecting circuit generates an under-threshold signal; an oscillating signal adjusting circuit for generating an adjusting current in response to the over-threshold signal and the under-threshold signal; and an oscillating signal generating circuit for generating and applying an oscillating signal to the switch control system, wherein the oscillating signal has a period adjusted by the adjusting current.