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Demonstration of a Compact Hard-Switched 3.5 kW DC/DC Converter utilizing Planar Magnetics optimized for low Capacitive Loss
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| Author(s) |
Christian ØSTERGAARD |
| Abstract |
It is necessary to accurately determine the power losses in a converter to obtain a high efficient design. This paper presents an in-depth analysis of all the power losses in a converter. The capacitive loss of the transformer and switches is investigated. A highly efficient 7:1 planar transformer is presented and the design is carefully interleaved to provide a small differential-mode capacitance and AC-resistance. Very accurate finite element simulations of the transformer equivalent circuit parameters are performed using Ansys Maxwell. A compact 5kW hard-switched isolated full-bridge forward converter is constructed with a power density of 14.1kW=L when the heatsink is excluded and 9.2kW=L when the heatsink is included. The calculated and measured peak efficiency of the converter is in close agreement with 97.6\% and 97.3\% respectively, thereby proving the accuracy of the power loss calculations. |
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| Filename: | 0199-epe2021-full-10595417.pdf |
| Filesize: | 776.5 KB |
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| Type |
Members Only |
| Date |
Last modified 2022-03-15 by System |
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