SWITCHING CONVERTER WITH ACCURATE ZERO CURRENT DETECTION AND CONTROL METHOD THEREOF
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United States of America Patent
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Issued Date -
Nov 3, 2016
app pub date -
Apr 22, 2016
filing date -
Apr 28, 2015
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Abstract
A zero current detection method used in a switching converter, wherein the switching converter has a first switch, a second switch with a body diode, and a tank element. The current flowing through the tank element increases when the first switch is on and the second switch is off, and decreases when the first switch is off and the second switch is on. The zero current detection method includes: adjusting an offset signal in accordance with the on-time of the body diode in the second switch; comparing the current flowing through the tank element with the offset signal; and turning off the second switch if the current flowing through the tank element is detected to be lower than the offset signal.
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