Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2011-03-22
2011-03-22
Berhane, Adolf (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S021180
Reexamination Certificate
active
07911814
ABSTRACT:
A flyback converter includes a controller integrated circuit (IC) housed in an IC package with only three terminals. An inexpensive TO-92 transistor package can be used. A switch terminal is coupled to an inductor switch that is turned on by a switch control signal having a frequency and a pulse width. The inductor switch controls the current that flows through a primary inductor of the flyback converter. The controller IC adjusts the frequency in a constant current mode such that output current remains constant and adjusts the pulse width in a constant voltage mode such that output voltage remains constant. A power terminal receives a feedback signal that is derived from a voltage across an auxiliary inductor of the flyback converter. The feedback signal provides power to the controller IC and is also used to generate the switch control signal. The controller IC is grounded through a ground terminal.
REFERENCES:
patent: 5313381 (1994-05-01), Balakrishnan
patent: 6434021 (2002-08-01), Collmeyer et al.
patent: 6958920 (2005-10-01), Mednik et al.
patent: 2008/0259656 (2008-10-01), Grant
patent: 2009/0279332 (2009-11-01), Grant et al.
patent: 2009/0295349 (2009-12-01), Tao et al.
Huynh Steven
Kunst David
Tao Zhibo
Active-Semi, Inc.
Berhane Adolf
Imperium Patent Works
Pham Emily
Wallace Darien K.
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