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Extended Analysis of the Asymmetrical Half-Bridge Flyback Converter.

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Title: Extended Analysis of the Asymmetrical Half-Bridge Flyback Converter.
Authors: Spiazzi, Giorgio1 (AUTHOR) spiazzi@dei.unipd.it, Buso, Simone1 (AUTHOR) simone.buso@dei.unipd.it
Source: IEEE Transactions on Power Electronics. Jul2021, Vol. 36 Issue 7, p7956-7964. 9p.
Subjects: Power resources, Zero voltage switching, Voltage-frequency converters
Abstract: Isolated, zero-voltage-switching dc–dc converter topologies represent attractive solutions in the continuous run toward higher switching frequencies, allowing more compact power supplies. Among them, the asymmetrical half-bridge flyback converter represents an interesting option, featuring simple duty-cycle control at constant switching frequency, as opposed to the popular LLC converter. The majority of papers dealing with this topology consider an approximated voltage gain similar to that of an isolated buck converter operating in continuous conduction mode, i.e., proportional to the duty cycle and, practically, load independent. On the contrary, the true voltage gain is nonmonotonic at high duty-cycle values. Anytime the converter is designed for a resonant operation, as is advisable to eliminate any reverse recovery problem of the rectifier diode, the voltage gain not only increases, but also becomes a function of the switching frequency. This article investigates the converter's voltage gain in detail, deriving a theoretical framework capable of capturing its real behavior and dependencies. The proposed analytical model has been verified through simulations as well as experimental measurements taken on a 160-W prototype working at 400 kHz. [ABSTRACT FROM AUTHOR]
Copyright of IEEE Transactions on Power Electronics is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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An: 149122637
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Extended Analysis of the Asymmetrical Half-Bridge Flyback Converter.
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  Data: <searchLink fieldCode="AR" term="%22Spiazzi%2C+Giorgio%22">Spiazzi, Giorgio</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> spiazzi@dei.unipd.it</i><br /><searchLink fieldCode="AR" term="%22Buso%2C+Simone%22">Buso, Simone</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> simone.buso@dei.unipd.it</i>
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  Data: <searchLink fieldCode="JN" term="%22IEEE+Transactions+on+Power+Electronics%22">IEEE Transactions on Power Electronics</searchLink>. Jul2021, Vol. 36 Issue 7, p7956-7964. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Power+resources%22">Power resources</searchLink><br /><searchLink fieldCode="DE" term="%22Zero+voltage+switching%22">Zero voltage switching</searchLink><br /><searchLink fieldCode="DE" term="%22Voltage-frequency+converters%22">Voltage-frequency converters</searchLink>
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  Label: Abstract
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  Data: Isolated, zero-voltage-switching dc–dc converter topologies represent attractive solutions in the continuous run toward higher switching frequencies, allowing more compact power supplies. Among them, the asymmetrical half-bridge flyback converter represents an interesting option, featuring simple duty-cycle control at constant switching frequency, as opposed to the popular LLC converter. The majority of papers dealing with this topology consider an approximated voltage gain similar to that of an isolated buck converter operating in continuous conduction mode, i.e., proportional to the duty cycle and, practically, load independent. On the contrary, the true voltage gain is nonmonotonic at high duty-cycle values. Anytime the converter is designed for a resonant operation, as is advisable to eliminate any reverse recovery problem of the rectifier diode, the voltage gain not only increases, but also becomes a function of the switching frequency. This article investigates the converter's voltage gain in detail, deriving a theoretical framework capable of capturing its real behavior and dependencies. The proposed analytical model has been verified through simulations as well as experimental measurements taken on a 160-W prototype working at 400 kHz. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of IEEE Transactions on Power Electronics is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1109/TPEL.2020.3044840
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 9
        StartPage: 7956
    Subjects:
      – SubjectFull: Power resources
        Type: general
      – SubjectFull: Zero voltage switching
        Type: general
      – SubjectFull: Voltage-frequency converters
        Type: general
    Titles:
      – TitleFull: Extended Analysis of the Asymmetrical Half-Bridge Flyback Converter.
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            NameFull: Spiazzi, Giorgio
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            NameFull: Buso, Simone
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            – D: 01
              M: 07
              Text: Jul2021
              Type: published
              Y: 2021
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              Value: 36
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              Value: 7
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            – TitleFull: IEEE Transactions on Power Electronics
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