Smooth-Transition Simple Digital PWM Modulator for Four-Switch Buck-Boost Converters

  1. Rodriguez, Alberto 1
  2. Rodriguez, Miguel 1
  3. Vazquez, Aitor 1
  4. Maija, Pablo F. 1
  5. Sebastian, Javier 1
  1. 1 Universidad de Oviedo
    info

    Universidad de Oviedo

    Oviedo, España

    ROR https://ror.org/006gksa02

Actas:
10th European Space Power Conference, Proceedings, ESA Special Publication

ISSN: 1609-042X

ISBN: 9789292212834

Año de publicación: 2014

Volumen: 719

Páginas: 116

Congreso: European Space Power Conference (10th. 2014. Netherlands)

Tipo: Aportación congreso

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Resumen

Four Switch non-inverting Buck-Boost (4SBB) converters are extensively used in non-isolated applications where voltage step-up and step-down are required. In order to achieve high efficiency operation it is preferred to control the 4SBB as a Buck or Boost converter, depending on the input/output voltage ratio. However, when input and output voltages are close this approach requires near- unity conversion ratios, which are difficult to achieve in practice. Several alternative operating modes have been proposed in the literature to overcome this issue. In particular, operating the 4SBB as a Buck and Boost at the same time (Buck+Boost mode) has proven to be adequate to achieve near-unity conversion ratios.This paper proposes a simple, hardware-efficient digital pulse width modulator for a 4SBB that enables operation in Buck, Boost and Buck+Boost modes, thus allowing near-unity conversion ratios, while achieving smooth transitions between the different modes. The proposed modulator is simulated with Simulink and experimentally demonstrated using a 500W 4SBB converter with 24V input voltage and 12V-36V output voltage range.

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