On the Practical Evaluation of the Switching Loss in the Secondary Side Rectifiers of LLC Converters
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...
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| Format: | Article |
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MDPI AG
2021-09-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/18/5915 |
| _version_ | 1797519394079768576 |
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| author | Manuel Escudero Matteo-Alessandro Kutschak Francesco Pulsinelli Noel Rodriguez Diego Pedro Morales |
| author_facet | Manuel Escudero Matteo-Alessandro Kutschak Francesco Pulsinelli Noel Rodriguez Diego Pedro Morales |
| author_sort | Manuel Escudero |
| collection | DOAJ |
| description | 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<sub>rr</sub>), most noticeably while operating above the series resonant frequency; and on the other hand, the output capacitance (C<sub>oss</sub>) 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<sub>oss</sub> 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<sub>oss</sub> hysteresis loss of several high-voltage and low-voltage devices is experimentally verified in the newly proposed measurement circuits. |
| first_indexed | 2024-03-10T07:42:10Z |
| format | Article |
| id | doaj.art-014978f3608941239abd0cfd4693aa05 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T07:42:10Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-014978f3608941239abd0cfd4693aa052023-11-22T12:55:01ZengMDPI AGEnergies1996-10732021-09-011418591510.3390/en14185915On the Practical Evaluation of the Switching Loss in the Secondary Side Rectifiers of LLC ConvertersManuel Escudero0Matteo-Alessandro Kutschak1Francesco Pulsinelli2Noel Rodriguez3Diego Pedro Morales4Infineon Technologies Austria AG, 9500 Villach, AustriaInfineon Technologies Austria AG, 9500 Villach, AustriaInfineon Technologies Austria AG, 9500 Villach, AustriaDepartment of Electronics and Computer Technology, University of Granada, 18011 Granada, SpainDepartment of Electronics and Computer Technology, University of Granada, 18011 Granada, SpainThe 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<sub>rr</sub>), most noticeably while operating above the series resonant frequency; and on the other hand, the output capacitance (C<sub>oss</sub>) 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<sub>oss</sub> 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<sub>oss</sub> hysteresis loss of several high-voltage and low-voltage devices is experimentally verified in the newly proposed measurement circuits.https://www.mdpi.com/1996-1073/14/18/5915C<sub>oss</sub> hysteresisisolated convertersLLCswitching losssoft switching |
| spellingShingle | Manuel Escudero Matteo-Alessandro Kutschak Francesco Pulsinelli Noel Rodriguez Diego Pedro Morales On the Practical Evaluation of the Switching Loss in the Secondary Side Rectifiers of LLC Converters Energies C<sub>oss</sub> hysteresis isolated converters LLC switching loss soft switching |
| title | On the Practical Evaluation of the Switching Loss in the Secondary Side Rectifiers of LLC Converters |
| title_full | On the Practical Evaluation of the Switching Loss in the Secondary Side Rectifiers of LLC Converters |
| title_fullStr | On the Practical Evaluation of the Switching Loss in the Secondary Side Rectifiers of LLC Converters |
| title_full_unstemmed | On the Practical Evaluation of the Switching Loss in the Secondary Side Rectifiers of LLC Converters |
| title_short | On the Practical Evaluation of the Switching Loss in the Secondary Side Rectifiers of LLC Converters |
| title_sort | on the practical evaluation of the switching loss in the secondary side rectifiers of llc converters |
| topic | C<sub>oss</sub> hysteresis isolated converters LLC switching loss soft switching |
| url | https://www.mdpi.com/1996-1073/14/18/5915 |
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