Switching mode power supplies and control methods used therein to provide power factor correction and constant output current
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United States of America Patent
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Jul 9, 2013
Grant Date -
Dec 1, 2011
app pub date -
May 8, 2011
filing date -
May 28, 2010
priority date (Note) -
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Abstract
Switching mode power supplies (SMPS) and control methods used thereof are disclosed. An exemplifying SMPS is coupled to control an inductive device. The SMPS comprises a voltage divider and a peak controller. The voltage divider comprises a resistor and a controllable resistor connected in series through a connection node. The resistance of the controllable resistor is variable, controlled by a control signal. The voltage divider generates a limiting signal at the connection node based on a line voltage at a line voltage power node. The peak controller controls a peak current flowing through the inductive device according to the limiting signal.
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