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Generalized Pulse Width Modulation Switch Model for Converters Based on the Multistate Switching Cell in

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This study presents a generalized pulse width modulation (PWM) switch model for multistate switching cells (MSSCs) in discontinuous conduction mode (DCM). The new circuit-based approach simplifies small-signal converter modeling without matrix operations.

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PWM switch modeldc–dc convertersdiscontinuous conduction modemultistate switching cellsmall-signal modeling

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Area of Science:

  • Electrical Engineering
  • Power Electronics
  • Control Systems

Background:

  • Small-signal modeling is crucial for analyzing converter dynamics.
  • Existing methods like state-space averaging (SSA) can be complex, especially for multistate switching cells (MSSCs).
  • Discontinuous conduction mode (DCM) operation presents unique modeling challenges.

Purpose of the Study:

  • To introduce a generalized pulse width modulation (PWM) switch model for MSSCs operating in DCM.
  • To provide a circuit-based alternative to SSA that avoids matrix manipulations.
  • To develop models applicable to any number of switching states and duty cycle regions.

Main Methods:

  • Generalized the existing PWM switch model for MSSCs in DCM.
  • Extended Vorperian's concept for multiphase converters.
  • Developed circuit-based DC and AC models.

Main Results:

  • The derived DC and AC models are valid for any number of switching states.
  • Models are applicable across all operating regions defined by the duty cycle.
  • Voltage gain and distinct transfer functions can be determined accurately.
  • Demonstrated applicability to various MSSC configurations.

Conclusions:

  • The generalized PWM switch model offers a simplified and versatile approach for MSSC small-signal modeling in DCM.
  • This circuit-based method enhances analysis without complex matrix computations.
  • The models provide accurate insights into converter behavior and performance.