Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2007-10-31
2011-10-25
Williams, Arun (Department: 2858)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C320S166000, C363S021040, C363S021120, C363S021180
Reexamination Certificate
active
08045344
ABSTRACT:
An inductor current flows through an inductor of a flyback converter. In a constant voltage mode, the pulse width of an inductor switch control signal is adjusted to maintain a constant output voltage of the flyback converter. The inductor switch control signal controls a switch through which the inductor current flows. In a constant current mode, a comparing circuit, a control loop and a clamp generator circuit are used to maintain the peak level of inductor current. The comparing circuit generates a timing signal based on the ramp-up rate of the inductor current. The control loop uses the timing signal and a feedback signal to generate a time error signal. The clamp generator circuit uses the time error signal to generate a clamp signal that adjusts the pulse width of the inductor switch control signal to clamp the peak current output by the flyback converter in the constant current mode.
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Active-Semi, Inc.
Imperium Patent Works
Wallace Darien K.
Williams Arun
LandOfFree
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