Comparative evaluation of a Triangular Current Mode (TCM) and Clamp-Switch TCM DC-DC boost converter
| Autor: | Dominik Bortis, Oliver Knecht, Johann W. Kolar |
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| Rok vydání: | 2016 |
| Předmět: |
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Engineering business.industry Flyback converter Buck converter 020208 electrical & electronic engineering Ćuk converter Electrical engineering Buck–boost converter 02 engineering and technology 030204 cardiovascular system & hematology SINADR 03 medical and health sciences 0302 clinical medicine Boost converter 0202 electrical engineering electronic engineering information engineering Electronic engineering Digital control business |
| Zdroj: | 2016 IEEE Energy Conversion Congress and Exposition (ECCE). |
| DOI: | 10.1109/ecce.2016.7854934 |
| Popis: | For the power management of a wireless power transfer system for implantable mechanical heart pumps, an additional boost DC-DC converter stage is needed in order to control the power delivered to the implant. Particularly, battery powered and implantable medical devices pose special demands on the efficiency and/or power density of the employed converters. Accordingly, soft-switching and/or high switching frequencies must be targeted. Modulation schemes that allow for Zero-Voltage-Switching (ZVS) such as Triangular Current Mode (TCM) offer a highly efficient operation, but suffer from a large operating frequency variation, which is mainly limited by the digital control. Therefore the Clamp-Switch TCM (CL-TCM) converter can be employed which allows also for the control of the switching frequency variation. In this paper, the CL-TCM and the TCM converter are compared regarding the power conversion efficiency and the power density of the converter. Since the CL-TCM converter is not well known in the literature, the converter is analysed in detail and a modulation scheme is explained that allows for ZVS for all switches in the entire range of operation. In addition, the requirements for ZVS and a control scheme (i.e. timing calculations) are provided for the converter in order to limit the maximum switching frequency. The modulation and control scheme are verified with a hardware prototype. Finally, the performance of the CL-TCM converter is measured and compared to the performance of the converter operated in TCM mode. The measurements show that the CL-TCM converter offers similar performance compared to the TCM operation at lower inductor power density, but has the advantage of a significantly reduced switching frequency variation. In applications, where a very high power density is needed, the TCM converter outperforms the CL-TCM converter in terms of efficiency. |
| Databáze: | OpenAIRE |
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