H
Hirokatsu Umegami
Researcher at Shimane University
Publications - 25
Citations - 225
Hirokatsu Umegami is an academic researcher from Shimane University. The author has contributed to research in topics: Wireless power transfer & Power semiconductor device. The author has an hindex of 9, co-authored 22 publications receiving 195 citations.
Papers
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Journal ArticleDOI
A Novel High-Efficiency Gate Drive Circuit for Normally Off-Type GaN FET
TL;DR: In this paper, an active discharged-type gate drive circuit was proposed to decrease the reverse conduction time of the gallium nitride field effect transistor (GaN FET).
Proceedings ArticleDOI
An analysis of false turn-on mechanism on power devices
TL;DR: This paper analyzes the gate noise performance using simulation and experimental tests focusing on the parasitic inductance of the power devices terminals and found that the gate noises can be related to the recovery current of the body diodes.
Proceedings ArticleDOI
An analysis of false turn-on mechanism on high-frequency power devices
TL;DR: In this paper, the authors analyzed the gate noise performance of wide bandgap semiconductor devices, such as: Gallium Nitride (GaN) and Silicon Carbide (SiC), focusing on the parasitic parameters of the power devices.
Journal ArticleDOI
Quasi-duality between SS and SP topologies of basic electric-field coupling wireless power transfer system
TL;DR: In this paper, the output power of the series-series (SS) and series-parallel (SP) topologies is approximated by that in the SS topology with transformed load impedance.
Journal ArticleDOI
Capacitor-Less Gate Drive Circuit Capable of High-Efficiency Operation for Non-Insulating-Gate GaN FETs
TL;DR: In this paper, a capacitor-less gate drive circuit is proposed as a solution to GaN-based power electronics circuits, which shows the effectiveness of a capacitorless gate circuit in terms of gate drive loss, reverse conduction loss, and recovery loss.