Lee, Hoi

Permanent URI for this collectionhttps://hdl.handle.net/10735.1/4603

Hoi Lee is a Professor of Electrical Engineering and the Principal Investigator of the Integrated Power Group. His research interests include:

  • Power Management Integrated Circuits
  • Soft-Switching Techniques and Power ICs for High-Voltage Power Converters Using Silicon and Wide-Bandgap Power Devices
  • Energy Harvesting Technologies
  • Wireless Power Transmission and Charging
  • Stimulation Systems for Biomedical Implantable Devices
  • Analog and Mixed-Signal Integrated Circuits

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Browsing Lee, Hoi by Subject "DC-to-DC converters"

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    A High-Efficiency Low-Profile Zero-Voltage Transition Synchronous Non-Inverting Buck-Boost Converter with Auxiliary-Component Sharing
    (IEEE, 2018-08-16) Cong, Lin; Liu, Jin; Lee, Hoi; Cong, Lin; Liu, Jin; Le, Hoi; 0000-0003-1945-6887 (Lee, H); Cong, Lin; Liu, Jin; Lee, Hoi
    This paper presents an efficiency-enhanced low-profile zero-voltage-transition (ZVT) synchronous non-inverting buck-boost converter for 48-V tens-of-Watt output applications. By only using three auxiliary components shared between two switching nodes, zero-voltage switching (ZVS) of all four power switches and zero-current switching of the auxiliary switch are achieved in the proposed converter to minimize the switching power loss. Compared with the existing ZVT topologies, the proposed converter reduces the required number of auxiliary components, thereby decreasing the converter volume and power loss. In addition, the proposed converter can be configured into the buck mode with full ZVS capability to support a wide input range from 36 V to 90 V. Experimental results show that the proposed converter can operate at 1 MHz and deliver a maximum output power of 75 W. The measured peak power efficiencies achieve 92.5% and 96.3% in the buck-boost mode and buck mode, respectively. Compared with the state-of-the-art ZVS-based buck-boost counterpart, the proposed converter reduces the volume of the auxiliary circuit by similar to 2 times even with 28% increase in the maximum load current and two times reduction in the switching frequency, and provides higher peak power efficiencies in both buck-boost and buck modes.

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