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On the Practical Evaluation of the Switching Loss in the Secondary Side Rectifiers of LLC Converters

Author

Listed:
  • Manuel Escudero

    (Infineon Technologies Austria AG, 9500 Villach, Austria)

  • Matteo-Alessandro Kutschak

    (Infineon Technologies Austria AG, 9500 Villach, Austria)

  • Francesco Pulsinelli

    (Infineon Technologies Austria AG, 9500 Villach, Austria)

  • Noel Rodriguez

    (Department of Electronics and Computer Technology, University of Granada, 18011 Granada, Spain)

  • Diego Pedro Morales

    (Department of Electronics and Computer Technology, University of Granada, 18011 Granada, Spain)

Abstract

The switching loss of the secondary side rectifiers in LLC resonant converters can have a noticeable impact on the overall efficiency of the complete power supply and constrain the upper limit of the optimum switching frequencies of the converter. Two are the main contributions to the switching loss in the secondary side rectifiers: on the one hand, the reverse recovery loss (Q rr ), most noticeably while operating above the series resonant frequency; and on the other hand, the output capacitance (C oss ) hysteresis loss, not previously reported elsewhere, but present in all the operating modes of the converter (under and above the series resonant frequency). In this paper, a new technique is proposed for the measurement of the switching losses in the rectifiers of the LLC and other isolated converters. Moreover, two new circuits are introduced for the isolation and measurement of the C oss hysteresis loss, which can be applied to both high-voltage and low-voltage semiconductor devices. Finally, the analysis is experimentally demonstrated, characterizing the switching loss of the rectifiers in a 3 kW LLC converter (410 V input to 50 V output). Furthermore, the C oss hysteresis loss of several high-voltage and low-voltage devices is experimentally verified in the newly proposed measurement circuits.

Suggested Citation

  • Manuel Escudero & Matteo-Alessandro Kutschak & Francesco Pulsinelli & Noel Rodriguez & Diego Pedro Morales, 2021. "On the Practical Evaluation of the Switching Loss in the Secondary Side Rectifiers of LLC Converters," Energies, MDPI, vol. 14(18), pages 1-23, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:18:p:5915-:d:637957
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    References listed on IDEAS

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    1. Maria R. Rogina & Alberto Rodriguez & Diego G. Lamar & Jaume Roig & German Gomez & Piet Vanmeerbeek, 2020. "Analysis of Intrinsic Switching Losses in Superjunction MOSFETs Under Zero Voltage Switching," Energies, MDPI, vol. 13(5), pages 1-13, March.
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    Cited by:

    1. Ruben Rafael Boros & István Bodnár, 2023. "Effect of SPWM Inverter in Combination with Solar Uninterruptible Induction Motor Drive," Energies, MDPI, vol. 16(13), pages 1-20, June.
    2. Kiran Kumar Geddam & Elangovan Devaraj, 2022. "Real Time Hardware-in-Loop Implementation of LLC Resonant Converter at Worst Operating Point Based on Time Domain Analysis," Energies, MDPI, vol. 15(10), pages 1-19, May.
    3. Danish Khan & Pengfei Hu & Muhammad Waseem & Muhammad Yasir Ali Khan & Mustafa Tahir & Andres Annuk, 2022. "Practical Evaluation of Loss Reduction in Isolated Series Resonant Converter with Fixed Frequency Modulation," Energies, MDPI, vol. 15(16), pages 1-20, August.
    4. Ruben Rafael Boros & István Bodnár, 2022. "Grid and PV Fed Uninterruptible Induction Motor Drive Implementation and Measurements," Energies, MDPI, vol. 15(3), pages 1-18, January.

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