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

Manuel Escudero, Matteo-Alessandro Kutschak, Francesco Pulsinelli, Noel Rodriguez and Diego Pedro Morales
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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

Energies, 2021, vol. 14, issue 18, 1-23

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.

Keywords: C oss hysteresis; isolated converters; LLC; switching loss; soft switching (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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