DocumentCode
2333746
Title
New Fixed-Off-Time PWM modulator provides constant frequency operation in boost PFC pre-regulators
Author
Adragna, C. ; De Simone, S. ; Gattavari, G.
Author_Institution
STMicroelectronics s.r.l., Agrate Brianza
fYear
2008
fDate
11-13 June 2008
Firstpage
656
Lastpage
661
Abstract
The objective of this paper is to describe a new fixed-off-time (FOT) PWM modulator and its application in boost PFC pre-regulators. The uniqueness of this new modulator, suitable for integration in a control IC, is that it provides the OFF-time modulated with the instantaneous line voltage in such a way that the resulting switching frequency is constant and not dependent on the rms input voltage or on the output load as long as the boost stage operates in continuous conduction mode (CCM).
Keywords
PWM power convertors; modulators; power factor correction; PWM modulator; boost PFC pre-regulators; continuous conduction mode; fixed-off-time; Circuits; Control systems; Costs; Frequency modulation; Power electronics; Pulse width modulation; Switches; Switching frequency; TV; Voltage; Fixed-Off-Time control; PFC; Peak current-mode control;
fLanguage
English
Publisher
ieee
Conference_Titel
Power Electronics, Electrical Drives, Automation and Motion, 2008. SPEEDAM 2008. International Symposium on
Conference_Location
Ischia
Print_ISBN
978-1-4244-1663-9
Electronic_ISBN
978-1-4244-1664-6
Type
conf
DOI
10.1109/SPEEDHAM.2008.4581235
Filename
4581235
Link To Document