DocumentCode :
3789860
Title :
Small-signal analysis and control design of isolated power supplies with optocoupler feedback
Author :
Y. Panov;M.M. Jovanovic
Author_Institution :
Power Electron. Lab., Delta Products Corp., Research Triangle Park, NC, USA
Volume :
20
Issue :
4
fYear :
2005
Firstpage :
823
Lastpage :
832
Abstract :
Optocouplers are widely used in isolated power supplies to transfer the feedback signal from the secondary to the primary side. In many power supplies, the feedback amplifier is supplied from the output voltage that creates additional feedback path which should be taken into account in the control design. The paper presents a detailed analysis and control design for each of the two possible feedback loops that can be identified. In addition, dynamic limitations of the TL431 shunt regulator and of the optocoupler are discussed. Practical guidelines for the error amplifier design and a design example are presented for both voltage-mode and current-mode controls.
Keywords :
"Control design","Power supplies","Regulators","Circuits","Transfer functions","Output feedback","Guidelines","Voltage control","Telecommunication control","Low voltage"
Journal_Title :
IEEE Transactions on Power Electronics
Publisher :
ieee
ISSN :
0885-8993
Type :
jour
DOI :
10.1109/TPEL.2005.850926
Filename :
1461464
Link To Document :
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