Primary-side feedback switching power supply
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United States of America Patent
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Jul 3, 2007
Grant Date -
N/A
app pub date -
Dec 27, 2006
filing date -
Dec 27, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention discloses a primary-side feedback switching power supply that uses a sample-and-hold circuit to obtain a corner voltage of a harmonic wave voltage while the primary-side auxiliary winding is operating at a discontinuous mode as a feedback control, and provides both voltage regulation and current limit functions. A stable voltage output is provided within the nominal input voltage and nominal output load, such that when the output reaches a current limit, the output voltage drops but the output current is controlled to remain unchanged, so as to provide an over-current protection.
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