A Simple Control Scheme to Avoid the Sensing Noise for the DC–DC Buck Converter With Synchronous Rectifier

The common method of improving efficiency when a synchronous buck converter operates at a light load is to adopt a current sensor to generate a turn-off command for the synchronous rectifying switch (SRS). However, a current-sensing technique with passive components is easily affected by noise and r...

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Bibliographic Details
Published inIEEE transactions on industrial electronics (1982) Vol. 65; no. 6; pp. 5086 - 5091
Main Authors Wang, Jian-Min, Tzeng, Li, Hsu, Ming-Tsung, Jian, Hong-Ru
Format Journal Article
LanguageEnglish
Published New York IEEE 01.06.2018
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Appliance industry
Buck converter
Buck converters
Capacitors
current sensor
Inductors
Integrated circuits
light load
Passive components
Pulse width modulation
Rectifiers
Switches
Voltage control
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Summary:The common method of improving efficiency when a synchronous buck converter operates at a light load is to adopt a current sensor to generate a turn-off command for the synchronous rectifying switch (SRS). However, a current-sensing technique with passive components is easily affected by noise and ringing, causing abnormal switching of the SRS. This study presents a simple control scheme for determining the zero point of an inductor current. It utilizes ripple voltage generated by a charging/discharging behavior from the capacitor to emulate the inductor current without using current sensors. The control strategy is verified by developing a 25-W synchronous rectifier buck converter.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2017.2772195