Revisiting the Reverse Switched Current of Buck, Boost, and Buck-Boost Converters in Voltage-Mode TCM-ZVS Control Considering Parasitic Resistances

Guangyao Yu*, Sachin Yadav, Jianning Dong, Pavol Bauer

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Triangular current mode (TCM) zero-voltage switching (ZVS) modulation method is widely adopted in power electronic converters to achieve acceptable efficiency in high switching frequency operations. For bidirectional dc-dc converters, in order to realize ZVS turn-on, a reverse inductor current can be utilized for this purpose through variable frequency control. In this article, this reverse switched current is revisited considering the parasitic resistances presented in the mosfet switches and the inductor for three common types of dc-dc converters, i.e., buck, boost, and buck-boost converters, which study was normally neglected in the previous research. Universal closed-form equations of the modified duty cycle and switched current are derived, which can be utilized to calculate the reverse current under different operating conditions. It is found that the parasitic resistances can have a negative impact on the switched current value, and this may lead to an unexpected loss of ZVS turn-on. A laboratory prototype of a four-switch buck+boost converter featuring TCM-ZVS buck, boost, and buck-boost operation capability was built to investigate and verify the proposed concepts. The operating voltage and power range are from 100 V to 400 V, and 300 W to 1 kW, respectively.

Original languageEnglish
Pages (from-to)8254-8268
Number of pages15
JournalIEEE Transactions on Power Electronics
Volume39
Issue number7
DOIs
Publication statusPublished - 2024

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • DC-DC power converters
  • parasitic resistances
  • triangular current mode (TCM)
  • zero-voltage switching (ZVS)

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