Power supply
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United States of America Patent
Stats
-
Mar 8, 1988
Grant Date -
N/A
app pub date -
Jan 16, 1987
filing date -
Jan 16, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A regulated switching power supply is disclosed in which the high current set point, during regulation, is the peak (170a) of the regulated current instead of the peak (170) of the line frequency noise. The alternating current (14) is rectified (44, 46) and filtered (52, 54) and the output voltage is sensed and fed back (80) to an error amplifier (86) which provides an error signal that is repsponsive to the output voltage. The current levels is sensed (160) and a current sensing signal is provided to a first comparator (172) which is set to a first reference level prior to regulation. Once regulation occurs, the error amplifier (86) provides an error signal to a second comparator (180), which operates to change the reference level of the first comparator (172). In this manner, the error signal resulting when regulation occurs provides a reference level which enables the first comparator (172) to provide an output signal in response to a lower sensed current level than the sensed current level before regulation occurs.
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