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Transformerless hybrid buck converter with wide conversion ratio

Rezaei I, Akhbari M ...see all

2011 2nd Power Electronics, Drive Systems and Technologies Conference, PEDSTC 2011 (2011) pp. 599-603

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Abstract

Conventional dc--dc converters are unable to provide very high step-down
conversion ratio due to the inherent limitation of power switches
and rectifier diodes in turning on and off instantaneously. Since
utilization of transformers to make high conversion ratio imposes
efficiency obstacle, more efficient transformerless converters have
been proposed. With transformerless hybrid converters high step-down
conversion ratio will be achieved and also efficiency problem will
be vanished. In this paper a hybrid buck converter formed by two
inductors and two diodes is considered in discontinuous conduction
mode (DCM). Critical values of circuit components are analytically
determined and compared with conventional buck converter. It is shown
that using the hybrid buck converter, smaller conversion ratio may
be achieved in comparison with conventional buck converter in both
DCM and CCM. Experimental results are illustrated for a hybrid buck
converter (100W, 5V). The experimental results confirm simulations
and analytical achievements.

Author-supplied keywords

  • CCM
  • DC-DC converter
  • DCM
  • high step-down
  • hybrid converter
  • power switches

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Authors

  • Iman Rezaei

  • Mahdi Akhbari

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