Switching power supply
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United States of America Patent
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-
Dec 27, 2005
Grant Date -
Apr 14, 2005
app pub date -
Sep 23, 2004
filing date -
Oct 9, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
It is an object to control the peak of drain current and control overload in a same switching device in a switching power supply which has a load of a transformer and so on, and to prevent a complicated circuit and an increase in the number of terminals of a control circuit. Overload protection is performed as follows: according to a change in a feedback current which is an input to a feedback signal control circuit, the peak value of the current of a switching element, a switching operation is performed intermittently to reduce power consumption when the feedback current decreases at a light load, and an increase in the voltage of an FB terminal is detected and the switching operation is stopped in an overload state where overload protection is performed on the switching element.
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