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Steady-State Stability of Current Mode Active-Clamp ZVS DC–DC Converters

Steady-State Stability of Current Mode Active-Clamp ZVS DC–DC Converters

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Steady-State Stability of Current Mode Active-Clamp ZVS DC–DC Converters

 Active-clamp dc–dc converters are pulse width 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 undercurrent 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 sub harmonic free operation is obtained. The results are veri?ed experimentally.


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  • Model: PROJ5877
  • 999 Units in Stock
  • Manufactured by: ClickMyProjects

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This product was added to our catalog on Monday 03 October, 2016.