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Efficient Power Converters for Ultra Light-Load Applications and Highly Variable Operating Conditions
Switching power converters are known for their high power conversion efficiency, but they suffer for much lower efficiency at light loads, and their performance varies widely with operating conditions (i.e. input and output voltages), as well as the size of the passive components (i.e. inductors and capacitors). Many applications, such as low-power microcontrollers, operate in ultra low power modes for most of their operation time, and require high flexibility in the size of the passive components and voltage levels.
This research is focused on developing highly adaptive control techniques for switching power converters to produce consistent performance under widely varying operating scenarios while achieving high efficiency at ultra light-load conditions.
Wei Fu, M. Radhakrishnan, S. T. Tan, R. Byrd and Ayman Fayed, “A DCM-only Buck Regulator with Hysteretic-Assisted Adaptive Minimum Constant On-time Control for Low-Power Microcontrollers,” IEEE Transactions on Power Electronics, vol. 31, no. 1, pp. 418-429, Jan. 2016.
Ahmed Abdelmoaty, Mohammad Al-Shyoukh, and Ayman Fayed, “A High-Voltage Level Shifter with Sub-Nano-Second Propagation Delay for Switching Power Converters,” 2016 IEEE Applied Power Electronics Conference (APEC), Long Beach, California, Mar. 2016, pp. 2437-2440.
Wei Fu and Ayman Fayed, “Power Conversion Schemes in Mixed-Signal SoCs,” 2014 IEEE Int. symposium on circuits and Systems (ISCAS), Melbourne VIC, Australia, Jun. 2014, pp. 606-609.
Wei Fu, Siang Tan Tong, and Ayman Fayed, “Switching and Conduction Loss Analysis of Buck Converters Operating in DCM-only Scenarios,” 2013 IEEE Int. symposium on circuits and Systems (ISCAS), Beijing, China, May 2013, pp. 921-924.