Switching regulator and method of adjusting pulse width

Details Switching regulator and method of adjusting pulse width Switching regulator and method of adjusting pulse width

2008-09-12

2010-12-28

Nguyen, Matthew V (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S282000, C323S288000

Reexamination Certificate

active

07859239

ABSTRACT:
A switching regulator switches according to an input signal and performs PWM control with a PWM pulse signal. The switching regulator includes a pulse width limiting circuit that includes a reference current source, a constant current source, a capacitor, an inverting block including a first switch circuit to supply a constant current to the capacitor and a second switch circuit to discharge a voltage across the capacitor to a ground, a determination circuit to determine whether the voltage across the capacitor becomes a given value or greater, and a limiting circuit to limit a pulse width of the PWM pulse signal. The inverting block further includes either a third switch circuit configured to pass the given constant current or a switching control circuit configured to cause the first and second switch circuits to pass the given constant current regardless of the PWM pulse signal.

REFERENCES:
patent: RE37609 (2002-03-01), Bittner
patent: 7061215 (2006-06-01), Harris
patent: 2006/0132110 (2006-06-01), Tang
patent: 2009/0237053 (2009-09-01), Gan
patent: 2009/0243577 (2009-10-01), Lim
patent: 2006-262646 (2006-09-01), None
patent: 2006-333636 (2006-12-01), None

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