Electric power conversion systems – Current conversion – Having plural converters for single conversion
Reexamination Certificate
2007-07-23
2010-06-08
Nguyen, Matthew V (Department: 2838)
Electric power conversion systems
Current conversion
Having plural converters for single conversion
C323S271000
Reexamination Certificate
active
07733675
ABSTRACT:
A circuit for preventing inductor saturation during a step-up load transient in a multi-phase converter circuit where phases are turned ON sequentially by a shared clock signal with a fixed phase shift, each phase having high- and low-side switches series connected at a switching node, the circuit including at least one closed loop connected to at least one phase for providing ripple current cancellation in input and output sides of the multi-phase converter circuit; an oscillator circuit for providing a signal to turn ON and OFF the high- and low-side switches of each of the phases of the multi-phase converter circuit; and a detection circuit to detect the transient. The detect circuit includes an error amplifier circuit to receive input signals from an output of the multi-phase converter and to provide an error signal; and a clock oscillator frequency changing circuit receiving the error signal for increasing the clock oscillation frequency when said detection circuit detects a step-up load transient.
REFERENCES:
patent: 6160725 (2000-12-01), Jansen
patent: 6188586 (2001-02-01), Farrington et al.
patent: 6600296 (2003-07-01), Hazucha
patent: 7034511 (2006-04-01), Schuellein et al.
Schuellein George
Wu Wenkai
Farjami & Farjami LLP
International Rectifier Corporation
Nguyen Matthew V
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