METHODS AND DEVICES FOR INHIBITING NEGATIVE OUTPUT CURRENT DURING START-UP OF A SWITCH MODE POWER SUPPLY
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United States of America Patent
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Issued Date -
May 21, 2009
app pub date -
Nov 19, 2007
filing date -
Nov 19, 2007
priority date (Note) -
Abandoned
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Abstract
A method of controlling a freewheel switch during start-up of a switch mode power supply to inhibit negative output current. The switch mode power supply has alternating first and second intervals. The freewheel switch has an ON-time and an OFF-time. The method includes gradually increasing the ON-time of the freewheel switch over a plurality of said intervals during start-up of the switch mode power supply until the ON-time of the freewheel switch is substantially equal to a duration of the second interval.
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