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Digital Power Conversion System based on a Sigma-Delta Modulator Linear Model

  • Autori: Capponi, G.; Livreri, P.; DI BLASI, G.; F., M.
  • Anno di pubblicazione: 2004
  • Tipologia: Proceedings (TIPOLOGIA NON ATTIVA)
  • Parole Chiave: DC-DC converters ; Digital control systems ; digital controller
  • OA Link:


This paper presents a new linear model for the Sigma-Delta (ΣΔ) modulator, based on modeling the nonlinear quantizer with a linear factor, and its input-to-output transfer function is given. The use of a 1-bit Sigma-Delta modulator in dc/dc power converter systems permits to implement a complete digital control. Results of an investigation from a prototype for a DC-DC converter are here reported. Using of a field programmable gate array allows implementing a simple variable control function. The modulator output produces a variable-frequency variable duty-ratio signal to control the switching power transistors.