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Albert Lee
University of Hong Kong
EngineeringInductorLight-emitting diodeElectronic engineeringDiode
34Publications
7H-index
162Citations
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Publications 40
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In this paper, a highly-efficient single-switch-regulated resonant wireless power receiver with hybrid modulation is proposed. To achieve both high efficiency and good output voltage regulation, phase shift and pulse width hybrid modulation are simultaneously applied. The soft switching operation in this topology is achieved by the cycle-by-cycle phase shift adjustment between the input current and the gate drive signal and also attributed to the reactive components such as the series-compensate...
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#1Weijian JinH-Index: 1
#2Albert LeeH-Index: 7
Last. Ron S.Y. HuiH-Index: 4
view all 4 authors...
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#1Shu Yuen Ron Hui (HKU: University of Hong Kong)H-Index: 54
#2Albert Lee (HKU: University of Hong Kong)H-Index: 7
Last. Siew-Chong Tan (HKU: University of Hong Kong)H-Index: 34
view all 3 authors...
Phosphor-coated light-emitting diode (PC-LED) is the dominant LED technology for public lighting. This paper presents a comprehensive theory for analyzing and modeling phosphor coating in white light-emitting diodes (LEDs) as a dynamic light converter. The new PC-LED model not only obeys the traditional diode equation, it includes the energy-storage and transient effects of the phosphor coating. Major control variables include energy storage in and the luminous flux from the phosphor coating. Th...
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#1Albert Lee (HKU: University of Hong Kong)H-Index: 7
#2Huanting Chen (Zhangzhou Normal University)H-Index: 9
Last. S. Y. Hui (HKU: University of Hong Kong)H-Index: 5
view all 4 authors...
Based on the dynamic photo-electro-thermal (PET) theory for light-emitting diode (LED) systems, a comprehensive theory for analyzing and modeling the phosphor coating in white LEDs as a dynamic light converter has been presented in Part I of this paper. Part II of this paper provides the details of the model parameter determination, model setup, and experimental verification. The procedures of obtaining the parameters in the experimental setup are explained. Using the comprehensive theory, a dyn...
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#1Weijian Jin (HKU: University of Hong Kong)H-Index: 1
Last. Siew-Chong TanH-Index: 34
view all 4 authors...
This paper presents a practical design approach for achieving a compact, economical and scalable single-inductor multiple-output (SIMO) DC-AC inverter for multi-coil wireless power transfer (WPT) applications. The hardware prototype of this SIMO inverter employs small industrial-grade surface-mount passive components with low equivalent series resistance (ESR) and an integrated two-channel MOSFET in a low-profile single chip package. A 16-bit on-board low-cost microcontroller (MCU) is used to ge...
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#1Albert Lee (HKU: University of Hong Kong)H-Index: 7
#2Weijian Jin (HKU: University of Hong Kong)H-Index: 1
Last. S. Y. Hui (HKU: University of Hong Kong)H-Index: 5
view all 4 authors...
In this paper, a nonisolated buck-boost single-inductor multiple-output (SIMO) dc–ac inverter for driving multiple independent high-frequency ac outputs of medium power is proposed. Compared with traditional bridge-type inverters, the proposed buck-boost SIMO inverter achieves 1) a smaller component count, 2) fully independent power control of its outputs, 3) better scalability in increasing the number of ac output channels, and 4) higher power efficiency. Operating in pseudo-continuous conducti...
1 CitationsSource
#1Huanting Chen (Zhangzhou Normal University)H-Index: 9
#2Albert Lee (HKU: University of Hong Kong)H-Index: 7
Last. Shu Yuen Ron Hui (HKU: University of Hong Kong)H-Index: 54
view all 4 authors...
Light-emitting diode (LED)-based visible light communication (VLC) has recently been promoted by the lighting industry for providing services and information for consumers in shopping malls. Communication system designs require well-defined signal-to-noise ratio (SNR). Being semiconductor devices, both LEDs and photodetectors are highly temperature-sensitive. This paper explores the electrical and thermal sensitivities of LED and photodetector together for VLC applications, and highlights the di...
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#1Albert Lee (HKU: University of Hong Kong)H-Index: 7
#2Weijian Jin (HKU: University of Hong Kong)H-Index: 1
Last. S. Y. Ron Hui (HKU: University of Hong Kong)H-Index: 19
view all 4 authors...
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