Multimode hybrid control strategy of LLC resonant converter in applications with wide input voltage range

Yan Li, Kun Zhang, Shuaifei Yang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This paper proposes a multimode hybrid control strategy that can achieve zero-voltage switching of primary switches and zero-current switching of secondary rectifier diodes in a wide input voltage range for full-bridge LLC resonant converters. When the input voltage is lower than the rated voltage, the converter operates in Mode 1 through the variable-frequency control strategy. When the input voltage is higher than the rated voltage, the converter operates in Mode 2 through the VF and phase-shift control strategy until the switching frequency reaches the upper limit. Then, the converter operates in Mode 3 through the constant-frequency and phase-shift control strategy. The secondary-side diode current will operate in the discontinuous current mode in Modes 1 and 3, whereas it will operate in the boundary current mode in Mode 2. The current RMS value and conduction loss can be reduced in Mode 2. A detailed theoretical analysis of the operation principle, the voltage gain characteristics, and the realization method is presented in this paper. Finally, a 500 W prototype with 100–200 V input voltage and 40 V output voltage is built to verify the feasibility of the multimode hybrid control strategy.

Original languageEnglish (US)
Pages (from-to)201-210
Number of pages10
JournalJournal of Power Electronics
Volume19
Issue number1
DOIs
StatePublished - Jan 1 2019

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Electric potential
Phase shift
Diodes
Zero voltage switching
Switching frequency
Switches

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

Cite this

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title = "Multimode hybrid control strategy of LLC resonant converter in applications with wide input voltage range",
abstract = "This paper proposes a multimode hybrid control strategy that can achieve zero-voltage switching of primary switches and zero-current switching of secondary rectifier diodes in a wide input voltage range for full-bridge LLC resonant converters. When the input voltage is lower than the rated voltage, the converter operates in Mode 1 through the variable-frequency control strategy. When the input voltage is higher than the rated voltage, the converter operates in Mode 2 through the VF and phase-shift control strategy until the switching frequency reaches the upper limit. Then, the converter operates in Mode 3 through the constant-frequency and phase-shift control strategy. The secondary-side diode current will operate in the discontinuous current mode in Modes 1 and 3, whereas it will operate in the boundary current mode in Mode 2. The current RMS value and conduction loss can be reduced in Mode 2. A detailed theoretical analysis of the operation principle, the voltage gain characteristics, and the realization method is presented in this paper. Finally, a 500 W prototype with 100–200 V input voltage and 40 V output voltage is built to verify the feasibility of the multimode hybrid control strategy.",
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Multimode hybrid control strategy of LLC resonant converter in applications with wide input voltage range. / Li, Yan; Zhang, Kun; Yang, Shuaifei.

In: Journal of Power Electronics, Vol. 19, No. 1, 01.01.2019, p. 201-210.

Research output: Contribution to journalArticle

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