Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2007-07-26
2010-02-23
Tso, Edward (Department: 2858)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S021010, C363S021130, C363S021180
Reexamination Certificate
active
07667987
ABSTRACT:
A comparing circuit and a control loop are used to maintain the peak level of current flowing through an inductor of a flyback converter. An inductor switch control signal controls a switch through which the inductor current flows. The inductor current increases at a ramp-up rate during a ramp time and stops increasing at the end of the ramp time. The comparing circuit generates a timing signal that indicates a target time at which the inductor current would reach a predetermined current limit if the inductor current continued to increase at the ramp-up rate. The control loop then receives the timing signal and compares the target time to the end of the ramp time. The pulse width of the inductor switch control signal is increased when the target time occurs after the end of the ramp time. Adjusting the frequency and pulse width controls the peak of the inductor current.
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Grant Matthew
Huynh Steven
Kunst David
Active-Semi, Inc.
Imperium Patent Works
Tso Edward
Wallace Darien K.
Williams Arun
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