Over power compensation in switched mode power supplies

Details Over power compensation in switched mode power supplies Over power compensation in switched mode power supplies

2008-11-20

2011-12-20

Berhane, Adolf (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S021130

Reexamination Certificate

active

08081495

ABSTRACT:
An over-power compensation circuit for use in a switched mode power supply having a current sense circuit for sensing a current flowing through a power transistor of the switched mode power supply. The over-power compensation circuit includes a peak detector, a sample-and-hold circuit, a current offset generator, and an offset resistor. The peak detector has an input for receiving an input voltage derived from the input line, and an output. The sample-and-hold circuit has an input connected to the output of the peak detector, and an output. The current offset generator has an input connected to the output of the sample-and-hold circuit, and an output for providing an offset current. The offset resistor has a first terminal connected to the output of the current offset generator, and a second terminal adapted to be connected to a current conducting electrode of the power transistor.

REFERENCES:
patent: 6343026 (2002-01-01), Perry
patent: 6356466 (2002-03-01), Smidt et al.
patent: 7646616 (2010-01-01), Wekhande et al.
patent: 2009/0040796 (2009-02-01), Lalithambika et al.

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