RPG Seminar – On Effect of Right-Half-Plane Zero Present in Buck Converters with Input Current Source in Wireless Power Receiver Systems
Date:
09 Dec, 2020 (Wed)
Time:
10:30 am
Webinar Link:
https://hku.zoom.us/j/4028281412?pwd=WlRaMnphd3RUa2Y5SUhuSXV4NE8xQT09
Meeting ID: 402 828 1412
Password: 928676

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Speaker

Mr. Kerui Li
Department of Electrical and Electronic Engineering
The University of Hong Kong

Abstract

In wireless power receiver systems, the buck converter is widely used to step down the higher rectified voltage derived from the wireless receiver coil, to a lower output voltage for the immediate battery charging process. In this work, the presence and effect of the right-half-plane (RHP) zeros found in the small-signal inductor-current-to-duty-ratio and output-voltage-to-duty-ratio transfer functions of the buck converter in the wireless power receiver system on the control performance, are investigated. It is found and mathematically proved that the RHP zeros are introduced by the current source nature of the system attributed to the series-series compensation and finite DC-link capacitance. The RHP zero not only results in non-monotonic open-loop dynamic response but also complicates the design of feedback control and causes potential closed-loop instability. Theoretical and experimental results are provided to validate the presence of the RHP zeros and their effect on open-loop and closed-loop dynamic responses.

Biography of the speaker:
Kerui Li received the B.S. degree from the South China University of Technology and the M.S. degree from Sun Yat-sen University. He is currently working toward the Ph.D. degree at The University of Hong Kong, Hong Kong. His research interest is wireless power transfer.

All are welcome.


Organizer

Prof. S.C. Tan

Most seminars are open to the general public, free of charge, unless otherwise stated. Registration is not required. Arrangement for car parking facilities on campus please contact us for details.

For enquiries, please contact:
Department of Electrical and Electronic Engineering,
Room 601, Chow Yei Ching Building,
Pokfulam Road, Hong Kong
Tel: (852) 3917 7093
Email: seminar@eee.hku.hk