Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Reexamination Certificate
2011-01-11
2011-01-11
Patel, Rajnikant B (Department: 2838)
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
C323S224000, C363S055000
Reexamination Certificate
active
07868595
ABSTRACT:
A regulator is provided. The regulator is a PWM-based switching regulator with soft-start. The regulator starts up with non-synchronously-rectified regulation. A soft-start done signal is asserted after soft-start is finished. In one embodiment, the soft-start done signal is asserted at about 150% of the soft-start time. After the soft-start done signal has been asserted, the regulator changes from non-synchronously-rectified regulation to synchronously-rectified regulation if a pre-determined period of time occurs with no zero-crossing in the inductor current. In one embodiment, the pre-determined period of time is one switching cycle. In some embodiments, the “zero-crossing” of the inductor current is slightly different from zero, such as −0.5 A.
REFERENCES:
patent: 5917313 (1999-06-01), Callahan, Jr.
patent: 6100677 (2000-08-01), Farrenkopf
patent: 6476589 (2002-11-01), Umminger et al.
patent: 6515880 (2003-02-01), Evans et al.
patent: 6683441 (2004-01-01), Schiff et al.
patent: 7045992 (2006-05-01), Silva et al.
patent: 7119524 (2006-10-01), Bretz et al.
patent: 7129679 (2006-10-01), Inaba et al.
patent: 7158394 (2007-01-01), Takahashi et al.
patent: 7196502 (2007-03-01), Sugiura et al.
patent: 7598715 (2009-10-01), Hariman et al.
patent: 7764054 (2010-07-01), Guo et al.
Peterchev, A.V. et al., “Digital Multimode Buck Converter Control With Loss-Minimizing Synchronous Rectifier Adaptation,” IEEE Transactions on Power Electronics, vol. 21, No. 6, Nov. 2006, pp. 1588-1599.
Mappus, S. “Predictive Gate Drive Boosts Synchronous DC/DC Power Converter Efficiency,” Texas Instruments Corp., Application Report SLUA281, Apr. 2003, pp. 1-26.
Acker, B. et al. “Synchronous Rectification with Adaptive Timing Control,” IEEE, vol. 1, Jun. 18-22, 1995, pp. 88-95.
LM2642, “Two-Phase Synchronous Step-Down Switching Controller,” National Semiconductor, Feb. 2006, pp. 1-21.
LM2645, “Advanced Two-Phase Switching Controller with Two Linear Outputs,” National Semiconductor, Apr. 2005, pp. 1-20.
Frommer & Lawrence & Haug LLP
Gaffney Matthew M.
National Semiconductor Corporation
Patel Rajnikant B
LandOfFree
Apparatus and method for soft-start mode transition in a... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for soft-start mode transition in a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for soft-start mode transition in a... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2679857