On loss mechanisms of complex switched capacitor converters

Yuval Beck, Nir Eden, Shira Sandbank, Sigmund Singer, Keyue Ma Smedley

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper the power losses of efficient capacitive converters with multitude transfer ratio values are discussed. The loss mechanism circuits, based on general transposed series parallel (GTSP) topology, is studied and the losses are calculated, which in turn enables the 'bottlenecks' to be identified and overcome. The calculations show that for a given number of switching cells the power losses of such converters are mainly dependent on the voltage conversion ratio, the topology function, the resistances of the switches in on and off states, the ESR of the capacitors, the switching frequency, the voltage drop, and the load. The theory explains the fact that was observed in experiments, that for low voltage conversion ratio values, efficiency decrease was measured. It is shown that for these low voltage ratio values the mechanism associated to the off resistance of the switches is more dominant and reduces the efficiency. This power loss estimation can be used as a powerful tool for the performance optimization of capacitive converters. The theoretical results are verified experimentally on a 10-cell GTSP converter prototype. The experimental results show good agreement with the proposed theory.

Original languageEnglish
Article number7279202
Pages (from-to)2771-2780
Number of pages10
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Volume62
Issue number11
DOIs
StatePublished - 28 Sep 2015

Keywords

  • DC-DC power conversion
  • integrated circuits
  • multiplying circuits
  • switched capacitor circuits

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