Electric power conversion systems – Current conversion – Having plural converters for single conversion
Reexamination Certificate
2005-01-04
2005-01-04
Patel, Rajnikant B. (Department: 2838)
Electric power conversion systems
Current conversion
Having plural converters for single conversion
C363S071000, C323S272000
Reexamination Certificate
active
06839252
ABSTRACT:
A two-step ripple-free multi-phase buck converter and method thereof comprises a first-stage voltage regulator to convert an input voltage to an intermediate voltage and a second-stage voltage regulator with a phase number not less than two to further convert the intermediate voltage to an output voltage by a split phase control, in which the ratio of the intermediate voltage to the output voltage is intended to the phase number such that the steady state output current of the converter approaches to be ripple-free, and hence the drivers and MOSFETs for the second-stage voltage regulator are lower cost, the efficiency of the second-stage voltage regulator is improved, and a higher slew rate current is obtained for transient driving capabilities.
REFERENCES:
patent: 5045989 (1991-09-01), Higaki et al.
patent: 5191519 (1993-03-01), Kawakami
patent: 5473528 (1995-12-01), Hirata et al.
patent: 5834925 (1998-11-01), Chesavage
patent: 6137274 (2000-10-01), Rajagopalan
patent: 6366062 (2002-04-01), Baretich et al.
Hsieh Shwu-Liang
Liu Jing-Meng
Tai Liang-Pin
Wang Hung-I
Patel Rajnikant B.
Richtek Technology Corp.
Rosenberg , Klein & Lee
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