Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Reexamination Certificate
2008-12-12
2010-11-30
Riley, Shawn (Department: 2838)
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
C323S901000
Reexamination Certificate
active
07843178
ABSTRACT:
Control circuitry controls a boost regulator during a start-up period. The control circuitry may comprise an oscillator for generating a clock signal. The oscillator may be configured for ramping up a frequency of the clock signal in accordance with an voltage to be applied to the oscillator and varied during the start-up period. The control circuit may further include a switching circuit configured for controlling a power switch of the boost regulator in response to the clock signal from the oscillator. The switching circuit can control the power switch to have an on-time which is largely independent of the operating frequency of the oscillator. The voltage to be applied to the oscillator may have the same initial voltage level upon startup of the control circuit, independent of an output voltage of the boost regulator.
REFERENCES:
patent: 6198258 (2001-03-01), Ando et al.
patent: 6469917 (2002-10-01), Ben-Yaakov
patent: 7183753 (2007-02-01), Tsuruya
Houk Talbott Mead
Perica Goran
Subramanian Muthu
Linear Technology Corporation
McDermott Will & Emery LLP
Riley Shawn
LandOfFree
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