Ray-Lee Lin

National Cheng Kung University

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C.-L. Huang

Rice University

Jiann-Fuh Chen

National Cheng Kung University

J.M. Tsai

National Yang Ming Chiao Tung University

Hanshang Jin

University of California, Davis

Tsorng‐Juu Liang

National Cheng Kung University

Wei‐Tin Chen

National Taiwan University

Hsu-Ming Shih

National Cheng Kung University

Shunyao Liu

Ningxia Medical University

P. Klavins

University of California, Davis

Valentin Taufour

University of California, Davis

Cooperative Institutions

National Cheng Kung University

National Yang Ming Chiao Tung University

National Taiwan University

University of California, Davis

I-Shou University

National Science and Technology Council

Helmholtz-Zentrum Dresden-Rossendorf

Cornell University

National United University

National Sun Yat-sen University

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Magnetic properties of binary alloys Ni1−xMox and Ni Physica B Condensed Matter (2024)

Jui-Feng Hsu Ray-Lee Lin Enzuo Liu Wei‐Tin Chen C.-L. Huang

Scalable Vector Graphics

10.1016/j.physb.2024.416524

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Citations (0)

A Novel Constant Power Control Circuit for HID Electronic Ballast

IEEE Transactions on Power Electronics (2007)

Chien-Ming Huang Tsorng‐Juu Liang Ray-Lee Lin Jiann-Fuh Chen

This paper presents a constant power control circuit for a three-stage high-intensity discharge (HID) electronic ballast. The three-stage electronic ballast is composed of a boost pre-regulator to achieve a high power factor, a DC/DC buck converter to regulate lamp current with constant lamp power, and a full-bridge inverter to drive the HID lamp with a low-frequency ac squarewave current. The buck converter operating in current mode utilizes current sense level-shift technique to achieve constant power output. The proposed constant power control circuit is easily designed and implemented for the three-stage HID electronic ballast. Finally, a laboratory prototype of a 70 W HID electronic ballast is implemented. The measured results show that the proposed ballast can be applied for various HID lamps with low lamp power variation (less than 0.6%).

Ballast

Gas-discharge lamp

Constant current

Buck converter

10.1109/tpel.2007.904159

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Citations (29)

Three-Phase Electronic Ballast With Current-Equalization Function

Journal of Display Technology (2006)

Ray-Lee Lin Chien-Hsin Wen

This paper proposes a three-phase electronic ballast with current-equalization function. By properly designing the resonant tank and the values of the resonant inductance and resonant capacitance, the current difference between lamps can be significantly reduced. Hence, current-equalization can be achieved by means of impedance-matching. Without an additional current-equalization circuit, the cost of the proposed circuit is reduced due to fewer components. The analysis and design of the proposed circuit will be presented in this paper. Finally, the proposed three-phase electronic ballast with current-equalization function will be implemented to validate and demonstrate the performance and feasibility of the proposed circuit

Ballast

RLC circuit

10.1109/jdt.2006.882772

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Citations (4)

Analysis and design of single-stage electronic ballast with bridgeless PFC configuration

Tsorng‐Juu Liang S.B. Kang Chun‐An Cheng Ray-Lee Lin Jiann-Fuh Chen

A single-stage, high power factor electronic ballast used to drive fluorescent lamps is analyzed and designed in the paper. The electronic ballast, combining a bridgeless power-factor-correction converter with a series-resonant parallel-loaded inverter, has the functionality of input current shaping for achieving high power factor (HPF) and provides a sufficient high voltage to strike the lamp during start-up period and rated lamp power at steady state. The features of the ballast are low cost, high power factor (PF>0.99), low crest factor (CF<1.7), zero-voltage switching (ZVS) and identical current stress on each power switch. Operational principles, design equations and experimental results of one 36-W fluorescent lamp operating at 50 kHz switching frequency with 110 V-rms line input voltage are presented.

Ballast

Crest factor

Fluorescent lamp

Single stage

10.1109/iecon.2003.1280031

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Citations (10)

Optimal Design of LED Array Combinations for CCM Single-Loop Control LED Drivers

IEEE Journal of Emerging and Selected Topics in Power Electronics (2015)

Ray-Lee Lin J.M. Tsai Shunyao Liu Hsin-Wei Chiang

This paper presents the optimal design of the light-emitting diode (LED) array combinations for three typical nonisolated continuous-conduction mode single-loop control LED drivers. Based on the LED Taylor series model and the equivalent circuits of these three LED drivers, the quality factor functions in their transfer functions of the control-to-output current are derived to predict the optimal combination of the LED arrays according to the given circuit and LED parameters to fulfill the requirement of critical damping and maximum efficiency power conversion, which happen at unity quality factor. The three prototype circuits of three LED drivers with 120 LEDs are presented to verify the optimal design of the corresponding LED array combinations through the theoretical, simulation, and experimental results.

LED lamp

10.1109/jestpe.2015.2413907

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Citations (32)

Taylor series expression based equivalent circuit models of LEDs for analysis of LED driver system

IEEE Industry Applications Society Annual Meeting (2011)

Ray-Lee Lin Chia-Chun Lee Shunyao Liu

This paper presents the Taylor series expression based equivalent circuit models of light emitting diodes (LEDs) for the analysis of the LED driver system. In order to describe the non-linear V-I characteristics of LEDs, Taylor series can be used to express the equivalent conductance components in the DC and AC equivalent circuit models of LEDs. Based on the Taylor series expression, the equivalent AC conductance in the equivalent circuit model of the LED array can be derived. Finally, one LED array with 5 paralleled strings of 4 LEDs in series is used for the comparison of the theoretical and measured results of the equivalent AC conductance component in the corresponding equivalent circuit model.

Equivalent series resistance

10.1109/ias.2011.6074372

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Citations (5)

Low-Harmonic Push–Pull Class-E Power Amplifier With a Pair of <emphasis emphasistype="italic">LC</emphasis> Resonant Networks

IEEE Transactions on Circuits and Systems I Fundamental Theory and Applications (2007)

Feng-Yin Chen Jiann-Fuh Chen Ray-Lee Lin

This paper proposes a novel push-pull Class-E series-parallel resonant power amplifier (PA), which parallels two basic one-inductor, one-capacitor Class-E high-efficiency switching-mode tuned PA (Sokal, 1981) circuits. This proposed topology utilizes a push-pull scheme to realize sinusoidal output voltage. The previously published Class-E circuits (Sokal, 1981) can be implemented in a very simplified circuit. However, the simplified circuit is only appropriate for applications in which the harmonic content of output is not an important criterion. The proposed amplifier with two series-parallel resonant load networks will allow sinusoidal output voltage to be achieved by associating with the positive and negative quasi-sinusoidal waveforms. The complementarily activated configuration will provide continuous high-ripple-frequency input-current waveforms; this approach significantly reduces electromagnetic interference and requires very little filtering. With the symmetry of the push-pull Class-E circuit, there is the additional benefit that the even harmonics are suppressed at the load, and thus there are fewer harmonic distortions. However, each switch is symmetrically driven with a duty ratio of less than 0.5 to meet the nominal Class-E operating conditions, which leads to a narrower operating frequency variation. A prototype of the proposed PA shows over 95% efficiency at 48-V input, with 18-W output and an operating frequency of 900 kHz

Emphasis (telecommunications)

Harmonic

10.1109/tcsi.2006.887637

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Citations (16)

Non-Fermi-liquid behavior consistent with a preasymptotic disorder-tuned ferromagnetic quantum critical point in the heavy fermion system CeTi1−xVxGe3

Physical Review Research (2024)

Ray-Lee Lin Hanshang Jin P. Klavins Wei‐Tin Chen Yen-Yu Chang

An investigation of the thermodynamic and electrical transport properties of the isoelectronic chemical substitution series CeTi1−xVxGe3 (CTVG) single crystals is reported. As x increases, the ferromagnetic (FM) transition temperature is suppressed, reaching absolute zero at the critical concentration x=0.4, where a non-Fermi-liquid low-temperature specific heat and electrical resistivity, as well as the hyperscaling of specific heat and magnetization, are found. Our study suggests the presence of an FM quantum critical point (QCP) in CTVG. The obtained critical exponents indicate that CTVG falls in the preasymptotic region of the disorder-tuned FM QCP predicted by the Belitz-Kirkpatrick-Vojta theory. Published by the American Physical Society 2024

10.1103/physrevresearch.6.033130

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Citations (0)

Four-Parameter Taylor Series-Based Light-Emitting-Diode Model

IEEE Journal of Emerging and Selected Topics in Power Electronics (2015)

Ray-Lee Lin J.M. Tsai J. Marcos Alonso D. Gacio

This paper presents a light-emitting-diode (LED) model based on the four-parameter Taylor series to describe the V-I characteristic of the LED at different junction temperatures. Therefore, in order to precisely model the LED nonlinear characteristics at different junction temperatures, an improved Taylor series-based LED model is proposed according to the four available parameters: 1) maximum operating point; 2) rated operating point; 3) knee point; and 4) temperature coefficient obtained from the LED V-I curves. Furthermore, in order to perform the dc and small-signal simulation and analyses of the LED drivers at different junction temperatures, the proposed model can be used to derive the LED dc and small-signal equivalent resistances at different junction temperatures. Finally, the measured results are compared with the modeled V-I curves, dc equivalent resistances, and small-signal equivalent resistances of the experimental LED at different junction temperatures.

Equivalent series resistance

Operating point

SIGNAL (programming language)

10.1109/jestpe.2015.2419878

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Citations (7)

Inductor phase feedback for phase-locked loop control of electronic ballasts

Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005. (2005)

Ray-Lee Lin Ming-Chieh Yeh

This paper proposes a novel phase-locked loop (PLL) control technique for electronic ballasts, using the phase-feedback signal from the resonant inductor. Generally speaking, the electronic ballast with PLL control has been used to drive some high-voltage lamps with high equivalent resistance at the steady state, such as cold-cathode fluorescent lamps (CCFLs). With the proposed control scheme for electronic ballasts is thus developed to tolerate lower equivalent resistance of the lamps at the steady state, to have the operating frequency of ballasts continuously track the resonant frequency of the resonant tank. Based on the derived analysis of the proposed PLL control scheme, the design and the implementation of a prototype circuit is provided to demonstrate the performance of the proposed PLL scheme associating with a current regulator circuit.

Ballast

RLC circuit

10.1109/ias.2005.1518851

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Citations (5)