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Time-varying effects and averaging issues in models for current-mode control

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2 Author(s)
D. J. Perreault ; Lab. for Electromagn. & Electron. Syst., MIT, Cambridge, MA, USA ; G. C. Verghese

This paper investigates issues in modeling of current-mode control in converters. The effects of the current-sampling intrinsic to current-mode control are analyzed, and inadequately recognized limitations of linear time-invariant (LTI) models at high frequencies (where the system behavior is time-varying) are exposed. The paper also examines the geometric methods used to derive duty-ratio constraints in averaged models of current-mode control and points out the sources of discrepancies among various models. The conclusions are supported by simulation and experimental results

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IEEE Transactions on Power Electronics  (Volume:12 ,  Issue: 3 )