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Steady-state stability of current mode active-clamp ZVS DCDC converters
- Source :
- IndraStra Global.
- Publication Year :
- 2010
-
Abstract
- Active-clamp dcdc converters are pulsewidth-modulated converters having two switches featuring zero-voltage switching at frequencies beyond 100 kHz. Generalized equivalent circuits valid for steady-state and dynamic performance have been proposed for the family of active-clamp converters. The active-clamp converter is analyzed for its dynamic behavior under current control in this paper. The steady-state stability analysis is presented. On account of the lossless damping inherent in the active-clamp converters, it appears that the stability region in the current-controlled active-clamp converters get extended for duty ratios, a little greater than 0.5, unlike in conventional hard-switched converters. The conventional graphical approach fails to assess the stability of current-controlled active-clamp converters due to the coupling between the filter inductor current and resonant inductor current. An analysis that takes into account the presence of the resonant elements is presented to establish the condition for stability. This method correctly predicts the stability of the current-controlled active-clamp converters. A simple expression for the maximum duty cycle for subharmonic free operation is obtained. The results are verified experimentally. � 2006 IEEE.
- Subjects :
- Current-programmed control
Simple expression
State stability
Graphical approach
Lossless
Duty cycles
Pulse-width-modulated
Subharmonics
Circuit theory
Resonant elements
Circuit oscillations
Dynamic performance
Active-clamp
Electrical and Electronic Engineering
Stability regions
Duty ratios
Current mode
Power converters
Subharmonic oscillations
Equivalent circuits
Dynamic behaviors
Switched converters
Zero voltage switching
Signal analysis
Resonant inductors
Current control
Stability
Equivalent-circuit model
Filter inductors
Subjects
Details
- Language :
- English
- ISSN :
- 23813652
- Database :
- OpenAIRE
- Journal :
- IndraStra Global
- Accession number :
- edsair.doi.dedup.....a548b9e2125775c81cdc28e728d21893