The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Chang-hua Lin - One of the best experts on this subject based on the ideXlab platform.
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Digital-dimming controller with current spikes elimination technique for LCD backlight electronic ballast
IEEE Transactions on Industrial Electronics, 2006Co-Authors: Chang-hua LinAbstract:A novel simple control strategy to improve the Ignition behavior of a cold cathode fluorescent lamp (CCFL) in digital-dimming mode is proposed in this paper. Due to restriking manipulation in the digital-dimming mode, the lamp life of CCFL is reduced substantially. For extending the lamp life, a digital-dimming controller with current spikes elimination technique is realized to reduce the high Ignition Voltage and eliminate the Ignition current spike. The half-bridge resonant inverter is employed in the presented backlight system to assess the system performance. Complete analysis and design considerations are discussed in detail in this paper. Experimental results agree with the theoretical prediction. The overall efficiency of the system achieved at the rated power is over 84.9%. The Ignition Voltage is reduced about 30% without any lamp current spike that occurred under digital-dimming operation.
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The design and implementation of a new digital dimming controller for the backlight resonant inverter
IEEE Transactions on Power Electronics, 2005Co-Authors: Chang-hua LinAbstract:This paper presents a new digital dimming controller (DDC) for the backlight resonant inverter to improve the Ignition behavior of the cold cathode fluorescent lamp (CCFL) and, hence, to increase the CCFL's lifespan. The DDC using a soft-starting technique (DDC-SST) is designed and developed to reduce the high Ignition Voltage and to eliminate the Ignition current spikes. A full-bridge resonant inverter is adopted in the backlight system. The design considerations along with a complete analysis for said controller are detailed. Encouraging experimental results in close agreement with the theoretical analysis are also exhibited. The overall system power efficiency is approximately 85%. The Ignition Voltage is reduced by around 30% without any lamp current spike occurring during the dimming control operation. The apparent advantages of the proposed dimmer are listed in the conclusion.
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Application of soft-starting technique to improve digital-dimming behavior for backlight module
2003Co-Authors: Chang-hua Lin, Liang-rui Chen, Kai-jun PaiAbstract:This paper proposes a simple control method to improve the Ignition behavior of cold cathode fluorescent lamp in digital-dimming control. The half-bridge resonant inverter is employed in the presented backlight system. To extend the lamp life, we realize a digital-dimming controller with soft-starting technique (DDC-SST) to reduce the high Ignition Voltage and to eliminate the Ignition current spike. Complete analysis and design considerations are discussed in detail in this paper. Simulation and experimental results are close to the theoretical prediction. The overall efficiency of the system achieved at the rated power is over 91%. The Ignition Voltage is reduced about 30% without any lamp current spike occurred under digital-dimming operation.
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An improved digital-dimming controller for back-light module applying frequency-shift technique
IECON'03. 29th Annual Conference of the IEEE Industrial Electronics Society (IEEE Cat. No.03CH37468), 1Co-Authors: Chang-hua Lin, Liang-rui Chen, Kai-jun PaiAbstract:A novel simple control method to improve the Ignition behavior of cold cathode fluorescent lamp in digital-dimming mode is proposed in this paper. The half-bridge resonant inverter is employed in the presented back-light system. To extend the lamp life, we realize a digital-dimming controller with frequency-shift technique (DDC-FST) to reduce the high Ignition Voltage and to eliminate the Ignition current spike. Complete analysis and design considerations are discussed in detail in this paper. Simulation and experimental results are close to the theoretical prediction. The overall efficiency of the system achieved at the rated power is over 91%. The Ignition Voltage is reduced about 30% without any lamp current spike occurred under digital-dimming operation.
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Digital-dimming controller with current spikes elimination technique for LCD backlight electronic ballast
Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition 2004. APEC '04., 1Co-Authors: Chang-hua Lin, Kai-jun PaiAbstract:A novel simple control method to improve the Ignition behavior of cold cathode fluorescent lamp in digital-dimming mode is proposed in this paper. To extend the lamp life, we realize a digital-dimming controller with current spikes elimination technique (DDC-CSET) to reduce the high Ignition Voltage and to eliminate the Ignition current spike. The half-bridge resonant inverter is employed in the presented backlight system to promote the system efficiency. Complete analysis and design considerations are discussed in detail in this paper. Experimental results are close to the theoretical prediction. The overall efficiency of the system achieved at the rated power is over 91%. The Ignition Voltage is reduced about 30% without any lamp current spike occurred under digital-dimming operation.
V. I. Kristya - One of the best experts on this subject based on the ideXlab platform.
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Influence of the Thermo-Field Electron Emission from the Cathode with a Thin Insulating Film on the Film Emission Efficiency and Ignition Voltage of the Townsend Gas Discharge
Russian Physics Journal, 2019Co-Authors: G. G. Bondarenko, M. R. Fisher, V. I. KristyaAbstract:A model of the thermo-field electron emission from the metal cathode with a thin insulating surface film at temperatures of 200–400 K is developed. An expression for the film emission efficiency in the gas discharge is obtained. The efficiency is equal to the fraction of electrons emitted into the film from the metal substrate, which enter the discharge volume and increase the effective secondary-electron emission yield of the cathode. It is shown that the thermo-field mechanism of electron emission influences noticeably the Ignition Voltage of the low-current discharge with such cathode at rather low temperatures exceeding the room temperature by less than 100 K.
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Modeling of the Influence of the Thickness of an Insulating Film on a Cathode Surface on its Effective Secondary-Electron Emission Yield in Low-Current Gas Discharge
Journal of Surface Investigation: X-ray Synchrotron and Neutron Techniques, 2019Co-Authors: V. I. Kristya, M. R. FisherAbstract:A model of low-current (Townsend) gas discharge in the presence of a thin insulating film on the surface of a cathode is formulated. It takes into account, along with ion-induced secondary-electron emission from the cathode, also the field emission of electrons from the cathode metal substrate into the film under a strong electric field, which is generated in the insulator when the current flows in the discharge. The emission efficiency of the film and the discharge characteristics are calculated as functions of its thickness. It is shown that the experimentally observed nonmonotonic dependences of the effective secondary-electron emission yield of the cathode and discharge Ignition Voltage on the film thickness can be explained by the nonuniformity of the electric-field distribution across the film.
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Calculation of the Ionization Coefficient in the Townsend Discharge in the Mixture of Argon and Mercury Vapors with Temperature-Dependent Composition
Russian Physics Journal, 2018Co-Authors: G. G. Bondarenko, M. R. Fisher, M. S. Dubinina, V. I. KristyaAbstract:For a hybrid model of the low-current discharge considering, along with direct ionization of the mixture components by electrons, the Penning ionization of mercury atoms by metastable argon atoms, the ionization coefficient in the argon–mercury mixture used in illuminating lamps is calculated. The analytical approximation formula describing the dependence of the ionization coefficient of the mixture on the reduced electric field strength and temperature is obtained for sufficiently wide ranges of their variations, and its accuracy is estimated. It is demonstrated that the discharge Ignition Voltage calculated using this formula is in agreement with the results of simulation and the available experimental data.
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Influence of temperature on the ionization coefficient and Ignition Voltage of the Townsend discharge in an argon–mercury vapor mixture
Technical Physics, 2017Co-Authors: G. G. Bondarenko, M. R. Fisher, V. I. KristyaAbstract:The kinetics of main types of charged and excited particles present in a low-current discharge in an argon–mercury vapor mixture used in gas-discharge illuminating lamps has been investigated in a wide interval of the reduced electric field strength and temperature. Mechanisms behind the production and loss of ions and metastable atoms have been discovered, and the temperature dependences of their contributions to maintaining their balance have been determined. It has been shown that, when the discharge is initiated in the lamp and the mercury content in the mixture is low, the ionization coefficient exceeds that in pure argon, which is almost exclusively due to the Penning reaction. The influence of this reaction grows with a reduction of the electric field strength in the interelectrode gap. The dependences of the discharge Ignition Voltage on the interelectrode gap (Paschen curves) for different temperatures of the mixture have been calculated, and the nonmonotonicity of the temperature dependence of the Ignition Voltage has been explained.
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Modeling of the effect of temperature and field-induced electron emission from the cathode with a thin insulating film on the Townsend discharge Ignition Voltage in argon–mercury mixture
Vacuum, 2016Co-Authors: G. G. Bondarenko, M. R. Fisher, V. I. KristyaAbstract:Abstract A model of the low-current (Townsend) discharge in argon–mercury mixture in the presence of a thin insulating oxide film on the cathode is developed. It takes into account the cathode ion-electron emission and the electron emission from the cathode metal substrate under the strong electric field generated in the film by the ion surface charge. An influence of the mixture temperature and the oxide film on the discharge Ignition Voltage is estimated and it is shown that formation of a thin insulating film on the cathode surface can facilitate the discharge Ignition in mercury-containing gas discharge devices at low temperatures.
M. R. Fisher - One of the best experts on this subject based on the ideXlab platform.
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Influence of the Thermo-Field Electron Emission from the Cathode with a Thin Insulating Film on the Film Emission Efficiency and Ignition Voltage of the Townsend Gas Discharge
Russian Physics Journal, 2019Co-Authors: G. G. Bondarenko, M. R. Fisher, V. I. KristyaAbstract:A model of the thermo-field electron emission from the metal cathode with a thin insulating surface film at temperatures of 200–400 K is developed. An expression for the film emission efficiency in the gas discharge is obtained. The efficiency is equal to the fraction of electrons emitted into the film from the metal substrate, which enter the discharge volume and increase the effective secondary-electron emission yield of the cathode. It is shown that the thermo-field mechanism of electron emission influences noticeably the Ignition Voltage of the low-current discharge with such cathode at rather low temperatures exceeding the room temperature by less than 100 K.
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Modeling of the Influence of the Thickness of an Insulating Film on a Cathode Surface on its Effective Secondary-Electron Emission Yield in Low-Current Gas Discharge
Journal of Surface Investigation: X-ray Synchrotron and Neutron Techniques, 2019Co-Authors: V. I. Kristya, M. R. FisherAbstract:A model of low-current (Townsend) gas discharge in the presence of a thin insulating film on the surface of a cathode is formulated. It takes into account, along with ion-induced secondary-electron emission from the cathode, also the field emission of electrons from the cathode metal substrate into the film under a strong electric field, which is generated in the insulator when the current flows in the discharge. The emission efficiency of the film and the discharge characteristics are calculated as functions of its thickness. It is shown that the experimentally observed nonmonotonic dependences of the effective secondary-electron emission yield of the cathode and discharge Ignition Voltage on the film thickness can be explained by the nonuniformity of the electric-field distribution across the film.
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Calculation of the Ionization Coefficient in the Townsend Discharge in the Mixture of Argon and Mercury Vapors with Temperature-Dependent Composition
Russian Physics Journal, 2018Co-Authors: G. G. Bondarenko, M. R. Fisher, M. S. Dubinina, V. I. KristyaAbstract:For a hybrid model of the low-current discharge considering, along with direct ionization of the mixture components by electrons, the Penning ionization of mercury atoms by metastable argon atoms, the ionization coefficient in the argon–mercury mixture used in illuminating lamps is calculated. The analytical approximation formula describing the dependence of the ionization coefficient of the mixture on the reduced electric field strength and temperature is obtained for sufficiently wide ranges of their variations, and its accuracy is estimated. It is demonstrated that the discharge Ignition Voltage calculated using this formula is in agreement with the results of simulation and the available experimental data.
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Influence of temperature on the ionization coefficient and Ignition Voltage of the Townsend discharge in an argon–mercury vapor mixture
Technical Physics, 2017Co-Authors: G. G. Bondarenko, M. R. Fisher, V. I. KristyaAbstract:The kinetics of main types of charged and excited particles present in a low-current discharge in an argon–mercury vapor mixture used in gas-discharge illuminating lamps has been investigated in a wide interval of the reduced electric field strength and temperature. Mechanisms behind the production and loss of ions and metastable atoms have been discovered, and the temperature dependences of their contributions to maintaining their balance have been determined. It has been shown that, when the discharge is initiated in the lamp and the mercury content in the mixture is low, the ionization coefficient exceeds that in pure argon, which is almost exclusively due to the Penning reaction. The influence of this reaction grows with a reduction of the electric field strength in the interelectrode gap. The dependences of the discharge Ignition Voltage on the interelectrode gap (Paschen curves) for different temperatures of the mixture have been calculated, and the nonmonotonicity of the temperature dependence of the Ignition Voltage has been explained.
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Modeling of the effect of temperature and field-induced electron emission from the cathode with a thin insulating film on the Townsend discharge Ignition Voltage in argon–mercury mixture
Vacuum, 2016Co-Authors: G. G. Bondarenko, M. R. Fisher, V. I. KristyaAbstract:Abstract A model of the low-current (Townsend) discharge in argon–mercury mixture in the presence of a thin insulating oxide film on the cathode is developed. It takes into account the cathode ion-electron emission and the electron emission from the cathode metal substrate under the strong electric field generated in the film by the ion surface charge. An influence of the mixture temperature and the oxide film on the discharge Ignition Voltage is estimated and it is shown that formation of a thin insulating film on the cathode surface can facilitate the discharge Ignition in mercury-containing gas discharge devices at low temperatures.
Kai-jun Pai - One of the best experts on this subject based on the ideXlab platform.
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Application of soft-starting technique to improve digital-dimming behavior for backlight module
2003Co-Authors: Chang-hua Lin, Liang-rui Chen, Kai-jun PaiAbstract:This paper proposes a simple control method to improve the Ignition behavior of cold cathode fluorescent lamp in digital-dimming control. The half-bridge resonant inverter is employed in the presented backlight system. To extend the lamp life, we realize a digital-dimming controller with soft-starting technique (DDC-SST) to reduce the high Ignition Voltage and to eliminate the Ignition current spike. Complete analysis and design considerations are discussed in detail in this paper. Simulation and experimental results are close to the theoretical prediction. The overall efficiency of the system achieved at the rated power is over 91%. The Ignition Voltage is reduced about 30% without any lamp current spike occurred under digital-dimming operation.
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An improved digital-dimming controller for back-light module applying frequency-shift technique
IECON'03. 29th Annual Conference of the IEEE Industrial Electronics Society (IEEE Cat. No.03CH37468), 1Co-Authors: Chang-hua Lin, Liang-rui Chen, Kai-jun PaiAbstract:A novel simple control method to improve the Ignition behavior of cold cathode fluorescent lamp in digital-dimming mode is proposed in this paper. The half-bridge resonant inverter is employed in the presented back-light system. To extend the lamp life, we realize a digital-dimming controller with frequency-shift technique (DDC-FST) to reduce the high Ignition Voltage and to eliminate the Ignition current spike. Complete analysis and design considerations are discussed in detail in this paper. Simulation and experimental results are close to the theoretical prediction. The overall efficiency of the system achieved at the rated power is over 91%. The Ignition Voltage is reduced about 30% without any lamp current spike occurred under digital-dimming operation.
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Digital-dimming controller with current spikes elimination technique for LCD backlight electronic ballast
Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition 2004. APEC '04., 1Co-Authors: Chang-hua Lin, Kai-jun PaiAbstract:A novel simple control method to improve the Ignition behavior of cold cathode fluorescent lamp in digital-dimming mode is proposed in this paper. To extend the lamp life, we realize a digital-dimming controller with current spikes elimination technique (DDC-CSET) to reduce the high Ignition Voltage and to eliminate the Ignition current spike. The half-bridge resonant inverter is employed in the presented backlight system to promote the system efficiency. Complete analysis and design considerations are discussed in detail in this paper. Experimental results are close to the theoretical prediction. The overall efficiency of the system achieved at the rated power is over 91%. The Ignition Voltage is reduced about 30% without any lamp current spike occurred under digital-dimming operation.
G. G. Bondarenko - One of the best experts on this subject based on the ideXlab platform.
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Influence of the Thermo-Field Electron Emission from the Cathode with a Thin Insulating Film on the Film Emission Efficiency and Ignition Voltage of the Townsend Gas Discharge
Russian Physics Journal, 2019Co-Authors: G. G. Bondarenko, M. R. Fisher, V. I. KristyaAbstract:A model of the thermo-field electron emission from the metal cathode with a thin insulating surface film at temperatures of 200–400 K is developed. An expression for the film emission efficiency in the gas discharge is obtained. The efficiency is equal to the fraction of electrons emitted into the film from the metal substrate, which enter the discharge volume and increase the effective secondary-electron emission yield of the cathode. It is shown that the thermo-field mechanism of electron emission influences noticeably the Ignition Voltage of the low-current discharge with such cathode at rather low temperatures exceeding the room temperature by less than 100 K.
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Calculation of the Ionization Coefficient in the Townsend Discharge in the Mixture of Argon and Mercury Vapors with Temperature-Dependent Composition
Russian Physics Journal, 2018Co-Authors: G. G. Bondarenko, M. R. Fisher, M. S. Dubinina, V. I. KristyaAbstract:For a hybrid model of the low-current discharge considering, along with direct ionization of the mixture components by electrons, the Penning ionization of mercury atoms by metastable argon atoms, the ionization coefficient in the argon–mercury mixture used in illuminating lamps is calculated. The analytical approximation formula describing the dependence of the ionization coefficient of the mixture on the reduced electric field strength and temperature is obtained for sufficiently wide ranges of their variations, and its accuracy is estimated. It is demonstrated that the discharge Ignition Voltage calculated using this formula is in agreement with the results of simulation and the available experimental data.
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Influence of temperature on the ionization coefficient and Ignition Voltage of the Townsend discharge in an argon–mercury vapor mixture
Technical Physics, 2017Co-Authors: G. G. Bondarenko, M. R. Fisher, V. I. KristyaAbstract:The kinetics of main types of charged and excited particles present in a low-current discharge in an argon–mercury vapor mixture used in gas-discharge illuminating lamps has been investigated in a wide interval of the reduced electric field strength and temperature. Mechanisms behind the production and loss of ions and metastable atoms have been discovered, and the temperature dependences of their contributions to maintaining their balance have been determined. It has been shown that, when the discharge is initiated in the lamp and the mercury content in the mixture is low, the ionization coefficient exceeds that in pure argon, which is almost exclusively due to the Penning reaction. The influence of this reaction grows with a reduction of the electric field strength in the interelectrode gap. The dependences of the discharge Ignition Voltage on the interelectrode gap (Paschen curves) for different temperatures of the mixture have been calculated, and the nonmonotonicity of the temperature dependence of the Ignition Voltage has been explained.
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Modeling of the effect of temperature and field-induced electron emission from the cathode with a thin insulating film on the Townsend discharge Ignition Voltage in argon–mercury mixture
Vacuum, 2016Co-Authors: G. G. Bondarenko, M. R. Fisher, V. I. KristyaAbstract:Abstract A model of the low-current (Townsend) discharge in argon–mercury mixture in the presence of a thin insulating oxide film on the cathode is developed. It takes into account the cathode ion-electron emission and the electron emission from the cathode metal substrate under the strong electric field generated in the film by the ion surface charge. An influence of the mixture temperature and the oxide film on the discharge Ignition Voltage is estimated and it is shown that formation of a thin insulating film on the cathode surface can facilitate the discharge Ignition in mercury-containing gas discharge devices at low temperatures.
