Utilization of the power losses map in the design of DC/DC converters (original) (raw)
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The Design of the Flyback Converter
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IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society, 2018
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Journal of Power Electronics, 2011
In space qualified DC-DC converters, optimization of the following electrical characteristics is of greater interest in comparison with other specifications; power loss/efficiency, output voltage ripple and volume/weight. The main goal of this paper is to present an appropriate solution for optimizing the above mentioned characteristics. For this purpose, a comprehensive power loss model of a DC-DC converter is fully developed. Proper models are also demonstrated for assessment of the output voltage ripple and the utilized transformer volume as the bulkiest component in a DC-DC converter. In order to provide a test bed for evaluation of the proposed models, a 50W push-pull DC-DC converter is designed and implemented. Finally, a novel cost function with three assigned weight functions is proposed in order to have a trade-off among the power loss, the output voltage ripple and the utilized transformer volume of the converter. The cost function is optimized for applications in which volume has the highest priority in comparison with power loss and ripple. The optimization results show that the transformer volume can be decreased by up to 51% and this result is verified by experimental results. The developed models and algorithms in this paper can be used for other DC-DC converter topologies with some minor modifications.
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DC-DC buck converters have wide applications in portable electronic devices, battery chargers, and telecommunications. However, single-phase DC-DC buck converters have some drawbacks, especially in high current applications, where the increase in the size of the inductor will increase power losses, which significantly affects the overall efficiency of the converter. The multiphase configuration offers several advantages, such as reduction in output voltage ripple, input current ripple, conduction loss, and the physical size of the hardware. This paper presents an analysis of the power losses of the multiphase DC-DC buck converter with output power ranging between 50 watts to 250 watts. To verify the effectiveness of the multiphase converter, performance analysis was done using OrCAD PSpice software, where the number of phases was limited to five phases. This paper focused on power losses in the converter, namely conduction losses in diodes and MOSFETs, switching loss in MOSFETs, as well as losses in the inductor and capacitor. The relationship between the number of phases and factors of switching frequency, output, and the components' internal resistance was also highlighted and discussed in detail.
The Eurasia Proceedings of Science Technology Engineering and Mathematics, 2021
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2011 XXIII International Symposium on Information, Communication and Automation Technologies, 2011
The analytical expressions for boost converter loss are presented in this paper. All significant sources of conduction and dynamic losses within the converter elements, including losses in choke magnetic material and switching losses which occur due to diode recovery time, are discussed. Sources of losses in continuous and discontinuous current mode of converter are examined. The equivalent input resistance of the generator is included in converter loss model. In the paper, the case when single-phase rectifier is input circuit of the converter is presented. Loss model of converter and its efficiency was compared with experimental measurements on a prototype of the boost converter.
International Journal of Engineering Research and Technology (IJERT), 2015
https://www.ijert.org/psim-model-and-power-loss-calculation-of-full-bridge-dc-dc-converter-used-for-renewable-energy-applications https://www.ijert.org/research/psim-model-and-power-loss-calculation-of-full-bridge-dc-dc-converter-used-for-renewable-energy-applications-IJERTV4IS080129.pdf This paper introduces a redundant , independent and modular type full bridge DC-DC converter to interconnect the output of renewable energy sources like solar, wind, fuel cells etc effectively to the dc grid The dc to dc converter uses high frequency transformer and MOSFET switches .The converter is intended to work in boost mode providing a 400V DC output to serve as the input of inverter which provides a 230V AC supply to the single phase line .The PSIM model is used here to validate the operation of the converter. Further the paper calculates the MOSFET power loss and efficiency of the converter using analytical equations and verified the results using simulation model.