The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform

Bo-hyung Cho - One of the best experts on this subject based on the ideXlab platform.

  • design of Fluorescent Lamp ballast with pfc using a power piezoelectric transformer
    IEEE Transactions on Industrial Electronics, 2005
    Co-Authors: Sung-jin Choi, Kyu-chan Lee, Bo-hyung Cho
    Abstract:

    An investigation of a high-power piezoelectric transformer (PT) as a potential component for a Fluorescent Lamp (FL) ballast with power factor correction (PFC) is discussed. The attractiveness of the PT is primarily the simplicity of the resulting circuit, and it is easy to be produced in mass with a low cost. A single-stage charge-pump PFC ballast using a PT is proposed. The proposed ballast circuit improved the drawbacks of the conventional voltage-source charge-pump PFC (VS-CPPFC) scheme. Empirical PT modeling based on power level excitation is performed to design the proposed circuit, and the experimental and simulation results are provided to verify theoretical analysis.

  • Design of Fluorescent Lamp ballast with PFC using a power piezoelectric transformer
    IEEE Transactions on Industrial Electronics, 2005
    Co-Authors: Sung-jin Choi, Kyu-chan Lee, Bo-hyung Cho
    Abstract:

    An investigation of a high power piezoelectric transformer as a\npotential component for a Fluorescent Lamp ballast with power factor\ncorrection (PFC) is discussed. The attractiveness of the piezoelectric\ntransformer is primarily the simplicity of the resulting circuit, and it\nis easy to produce in mass with a low cost. Electrical modeling,\nconsidering operating current level and analysis of the piezoelectric\ntransformer are performed through measurements to design a Fluorescent\nLamp ballast with a single stage charge pump PFC. The experimental and\nsimulation results are provided to verify theoretical analysis

Wei Yan - One of the best experts on this subject based on the ideXlab platform.

  • An improved semi-theoretical Fluorescent Lamp model for dimmable applications
    Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC, 2009
    Co-Authors: D.y. Lin, S Y R Hui, Wei Yan, Y. X. Qin
    Abstract:

    Due to the energy-saving and environmentally friendly features, dimmable magnetic ballasts will be paid more attention in the future. This make a more accurate Fluorescent Lamp model at different dimming levels necessary at low operating frequency. This paper presents a new method that considers the effect of tube temperature at different dimming levels in the process of the analysis of the Fluorescent Lamp model. The model is verified favorably by the comparison between the simulation results and experimental results. It's clear that after the effect of tube temperature at different dimming levels is considered, the model becomes more accurate and reliable than before. This model can be used to design dimmable magnetic ballast. Hence, the proposed model shows a good degree of accuracy for a large dimming range at different operating frequencies.

  • A semi-theoretical Fluorescent Lamp model for time-domain transient and steady-state simulations
    IEEE Transactions on Power Electronics, 2007
    Co-Authors: Wei Yan, Eugene Tam, S. Y. Hui
    Abstract:

    Low-pressure discharge Lamps obey a set of physical laws that are different from those of high-pressure discharge Lamps. In this paper, these differences are addressed. Based on a recently developed HID Lamp model frame, a semi-theoretical Fluorescent Lamp model that can be determined by genetic algorithms and simple electrical measurements is presented. This model does not require any Lamp data from Lamp manufacturers. Its parameters can be determined from electrical voltage and current measurements of the Lamps under AC operation at mains frequency. With the same set of parameters, the model can predict the Lamp terminal characteristics accurately under low, medium and high frequency operations. Good simulation results were achieved when the Lamp power was reduced to 60% of rated power and when the Lamp was operated under step-up and step-down transient processes. Simulation results for different sizes of tubular and compact Fluorescent Lamps agree well with their experimental results. Particularly, the differences between simulation results and experimental results under rated power are less than 10%. Hence, the proposed model shows a good degree of accuracy: 1) for different types of Fluorescent Lamps; 2) at different operating frequencies; 3) under different dimming levels; and 4) during step-up and step-down transient processes.

Sung-jin Choi - One of the best experts on this subject based on the ideXlab platform.

  • design of Fluorescent Lamp ballast with pfc using a power piezoelectric transformer
    IEEE Transactions on Industrial Electronics, 2005
    Co-Authors: Sung-jin Choi, Kyu-chan Lee, Bo-hyung Cho
    Abstract:

    An investigation of a high-power piezoelectric transformer (PT) as a potential component for a Fluorescent Lamp (FL) ballast with power factor correction (PFC) is discussed. The attractiveness of the PT is primarily the simplicity of the resulting circuit, and it is easy to be produced in mass with a low cost. A single-stage charge-pump PFC ballast using a PT is proposed. The proposed ballast circuit improved the drawbacks of the conventional voltage-source charge-pump PFC (VS-CPPFC) scheme. Empirical PT modeling based on power level excitation is performed to design the proposed circuit, and the experimental and simulation results are provided to verify theoretical analysis.

  • Design of Fluorescent Lamp ballast with PFC using a power piezoelectric transformer
    IEEE Transactions on Industrial Electronics, 2005
    Co-Authors: Sung-jin Choi, Kyu-chan Lee, Bo-hyung Cho
    Abstract:

    An investigation of a high power piezoelectric transformer as a\npotential component for a Fluorescent Lamp ballast with power factor\ncorrection (PFC) is discussed. The attractiveness of the piezoelectric\ntransformer is primarily the simplicity of the resulting circuit, and it\nis easy to produce in mass with a low cost. Electrical modeling,\nconsidering operating current level and analysis of the piezoelectric\ntransformer are performed through measurements to design a Fluorescent\nLamp ballast with a single stage charge pump PFC. The experimental and\nsimulation results are provided to verify theoretical analysis

S. Y. Hui - One of the best experts on this subject based on the ideXlab platform.

  • A semi-theoretical Fluorescent Lamp model for time-domain transient and steady-state simulations
    IEEE Transactions on Power Electronics, 2007
    Co-Authors: Wei Yan, Eugene Tam, S. Y. Hui
    Abstract:

    Low-pressure discharge Lamps obey a set of physical laws that are different from those of high-pressure discharge Lamps. In this paper, these differences are addressed. Based on a recently developed HID Lamp model frame, a semi-theoretical Fluorescent Lamp model that can be determined by genetic algorithms and simple electrical measurements is presented. This model does not require any Lamp data from Lamp manufacturers. Its parameters can be determined from electrical voltage and current measurements of the Lamps under AC operation at mains frequency. With the same set of parameters, the model can predict the Lamp terminal characteristics accurately under low, medium and high frequency operations. Good simulation results were achieved when the Lamp power was reduced to 60% of rated power and when the Lamp was operated under step-up and step-down transient processes. Simulation results for different sizes of tubular and compact Fluorescent Lamps agree well with their experimental results. Particularly, the differences between simulation results and experimental results under rated power are less than 10%. Hence, the proposed model shows a good degree of accuracy: 1) for different types of Fluorescent Lamps; 2) at different operating frequencies; 3) under different dimming levels; and 4) during step-up and step-down transient processes.

Y. X. Qin - One of the best experts on this subject based on the ideXlab platform.

  • An improved semi-theoretical Fluorescent Lamp model for dimmable applications
    Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC, 2009
    Co-Authors: D.y. Lin, S Y R Hui, Wei Yan, Y. X. Qin
    Abstract:

    Due to the energy-saving and environmentally friendly features, dimmable magnetic ballasts will be paid more attention in the future. This make a more accurate Fluorescent Lamp model at different dimming levels necessary at low operating frequency. This paper presents a new method that considers the effect of tube temperature at different dimming levels in the process of the analysis of the Fluorescent Lamp model. The model is verified favorably by the comparison between the simulation results and experimental results. It's clear that after the effect of tube temperature at different dimming levels is considered, the model becomes more accurate and reliable than before. This model can be used to design dimmable magnetic ballast. Hence, the proposed model shows a good degree of accuracy for a large dimming range at different operating frequencies.