Duty-cycle independent current limit for a power regulator

Details Duty-cycle independent current limit for a power regulator Duty-cycle independent current limit for a power regulator

2008-11-06

2010-10-05

Vu, Bao Q (Department: 2838)

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

C323S224000, C323S282000, C323S284000, C323S285000

Reexamination Certificate

active

07808218

ABSTRACT:
One embodiment of the invention includes a power regulator system. The system comprises an error amplifier that provides an error voltage based on a comparison of a reference voltage and a feedback voltage associated with an output voltage of the power regulator system. The system also comprises a pulse-width modulation (PWM) comparator configured to generate a switching signal that controls activation and deactivation of at least one power switch. The PWM comparator defining a duty-cycle of the switching signal based on the error voltage. The system further comprises a current limit circuit configured to clamp the error voltage upon the error voltage exceeding a voltage limit having a magnitude that varies as a function of the duty-cycle to provide a predetermined current limit that is substantially fixed independent of the duty-cycle.

REFERENCES:
patent: 6178104 (2001-01-01), Choi
patent: 6498466 (2002-12-01), Edwards
patent: 2006/0268586 (2006-11-01), Mikulenka et al.
patent: 2007/0120547 (2007-05-01), Tateishi et al.
patent: 2007/0252567 (2007-11-01), Dearn et al.
patent: 2007/0257645 (2007-11-01), Nishino
patent: 2009/0278521 (2009-11-01), Omi et al.
patent: 2004 208857 (2004-07-01), None

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