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13 results on '"Zhao, Hongbo"'

3. Core Energy Capacitance of NiZn Inductors

Author

Shen, Zhan, primary, Chen, Wu, additional, Zhao, Hongbo, additional, Jin, Long, additional, Hanson, Alex J., additional, Perreault, David J., additional, Sullivan, Charles R., additional, Blaabjerg, Frede, additional, and Wang, Huai, additional

Published
2023
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4. Discovery of Loss Imbalance in SiC Half-Bridge Power Modules – Analysis and Validations

Author

Kjaersgaard, Benjamin Futtrup, Liu, Gao, Aunsborg, Thore Stig, Dalal, Dipen Narendra, Jorgensen, Jannick Kjaer, Rannestad, Bjorn, Zhao, Hongbo, and Munk-Nielsen, Stig

Abstract

It is commonly assumed that power semiconductor switching losses are the same for high-side and low-side devices in a half-bridge power module. However, this article reveals that the high-side SiC mosfet in a medium-voltage power module exhibits over 40% higher switching energy compared with the low-side SiC mosfet. The loss imbalance is attributed to the parasitic high-side gate capacitance in the power module, which contributes to the equivalent high-side Miller capacitance. A physics-based switching energy dissipation model is, therefore, proposed, distinguishing between low-side and high-side switching energy dissipation. Double pulse testing demonstrates that high-side switching energy dissipation increases by 5 mJ per 2.5-pF increment in the equivalent Miller capacitance, aligning closely with the analytically calculated increase of 6 mJ per 2.5 pF. Continuous power module testing shows a 10 $\mathrm{^{\circ }}$C increase in high-side junction temperature. The findings from this article offer crucial insights into research, design, and manufacturing of half-bridge modules enabled by SiC mosfets.

Published
2024
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5. Effects of Airgaps on Parasitic Capacitance of Magnetic Components

Author

Luan, Shaokang, Yan, Zhixing, and Zhao, Hongbo

Abstract

This article investigates the effects of airgaps between different parts of magnetic cores on the parasitic capacitance of magnetic components, which was excluded by previous research. According to the physical mechanism of the electric field in airgaps, the single-perfect-electric-conductor assumption, which has been widely used in previous research, is improved to mutiperfect-electric-conductor assumption by considering the effects of airgaps on the voltage potential distribution of magnetic components. Furthermore, the improved physics-based analytical model is developed based on the proposed assumption for demonstrating the effects of airgaps on the parasitic capacitance of magnetic components. The analyses are verified by finite-element-method simulations and experimental verifications, which accurately predict the effects of airgaps on the voltage potential distribution and the parasitic capacitance in magnetic components.

Published
2024
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7. Parasitic Capacitive Couplings in Medium Voltage Power Electronic Systems - an Overview

Author

Kjaersgaard, Benjamin Futtrup, primary, Liu, Gao, additional, Nielsen, Morten Rahr, additional, Wang, Rui, additional, Dalal, Dipen Narendra, additional, Aunsborg, Thore Stig, additional, Jorgensen, Jannick Kjaer, additional, Yan, Zhixing, additional, Jacobsen, Jonas, additional, Wu, Rui, additional, Bech, Michael Moller, additional, Rannestad, Bjørn, additional, Munk-Nielsen, Stig, additional, and Zhao, Hongbo, additional

Published
2023
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