The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform

Ping Wen Wang - One of the best experts on this subject based on the ideXlab platform.

  • A novel single-stage high power factor electronic ballast for metal halide Lamps free of acoustic resonance
    IEEE Transactions on Power Electronics, 2011
    Co-Authors: Hung Liang Cheng, Ping Wen Wang
    Abstract:

    This paper proposes a novel single-stage high-power-factor electronic ballast for Metal-Halide Lamps. By integrating two buck-boost converters, a full-bridge inverter and a bidirectional buck converter, a single-stage electronic ballast with symmetrical circuit topology is derived. The circuit component count can be effectively reduced and circuit energy-conversion efficiency is improved. With a tactful control scheme, the proposed electronic ballast can output a low-frequency square-wave voltage to drive Metal-Halide Lamps. The problematic phenomena of acoustic resonance can be eliminated. Both the buck-boost converters serve as power-factor correction (PFC) circuits, which are operated at discontinuous conduction mode (DCM) to obtain a unity power factor at the input line. The operation modes, design equations, and design steps for the circuit parameters are proposed. A prototype circuit designed for a 70-W Metal-Halide Lamp was built and tested to verify the analytical predictions. Satisfactory performances are obtained from the experimental results.

Diego G. Lamar - One of the best experts on this subject based on the ideXlab platform.

  • A Single-Stage High-Power-Factor Electronic Ballast Based on Integrated Buck Flyback Converter to Supply Metal Halide Lamps
    IEEE Transactions on Industrial Electronics, 2008
    Co-Authors: M.a. Dalla Costa, Jorge Garcia, João Miranda, J.m. Alonso, Diego G. Lamar
    Abstract:

    In this paper, a novel single-stage electronic ballast with a high power factor is presented. The ballast circuit is based on the integration of a buck converter to provide the power factor correction, and a flyback converter to control the Lamp power and to supply the Lamp with a low-frequency square-waveform current. Both converters work in discontinuous conduction mode, which simplifies the control. In spite of being an integrated topology, the circuit does not present additional stress of voltage or current in the main switch, which handles only the flyback or buck current, depending on the operation mode. To supply the Lamp with a low-frequency square-wave current to avoid acoustic resonances, the flyback has two secondary windings that operate complementarily at a low frequency. The design procedure of the converters is also detailed. Experimental results from a 35-W metal halide Lamp are presented, where the proposed ballast reached a power factor of 0.95, a total harmonic distortion of 30% (complying with IEC 61000-3-2), and an efficiency of 90%.

Hung Liang Cheng - One of the best experts on this subject based on the ideXlab platform.

  • A novel single-stage high power factor electronic ballast for metal halide Lamps free of acoustic resonance
    IEEE Transactions on Power Electronics, 2011
    Co-Authors: Hung Liang Cheng, Ping Wen Wang
    Abstract:

    This paper proposes a novel single-stage high-power-factor electronic ballast for Metal-Halide Lamps. By integrating two buck-boost converters, a full-bridge inverter and a bidirectional buck converter, a single-stage electronic ballast with symmetrical circuit topology is derived. The circuit component count can be effectively reduced and circuit energy-conversion efficiency is improved. With a tactful control scheme, the proposed electronic ballast can output a low-frequency square-wave voltage to drive Metal-Halide Lamps. The problematic phenomena of acoustic resonance can be eliminated. Both the buck-boost converters serve as power-factor correction (PFC) circuits, which are operated at discontinuous conduction mode (DCM) to obtain a unity power factor at the input line. The operation modes, design equations, and design steps for the circuit parameters are proposed. A prototype circuit designed for a 70-W Metal-Halide Lamp was built and tested to verify the analytical predictions. Satisfactory performances are obtained from the experimental results.

M.a. Dalla Costa - One of the best experts on this subject based on the ideXlab platform.

  • A Single-Stage High-Power-Factor Electronic Ballast Based on Integrated Buck Flyback Converter to Supply Metal Halide Lamps
    IEEE Transactions on Industrial Electronics, 2008
    Co-Authors: M.a. Dalla Costa, Jorge Garcia, João Miranda, J.m. Alonso, Diego G. Lamar
    Abstract:

    In this paper, a novel single-stage electronic ballast with a high power factor is presented. The ballast circuit is based on the integration of a buck converter to provide the power factor correction, and a flyback converter to control the Lamp power and to supply the Lamp with a low-frequency square-waveform current. Both converters work in discontinuous conduction mode, which simplifies the control. In spite of being an integrated topology, the circuit does not present additional stress of voltage or current in the main switch, which handles only the flyback or buck current, depending on the operation mode. To supply the Lamp with a low-frequency square-wave current to avoid acoustic resonances, the flyback has two secondary windings that operate complementarily at a low frequency. The design procedure of the converters is also detailed. Experimental results from a 35-W metal halide Lamp are presented, where the proposed ballast reached a power factor of 0.95, a total harmonic distortion of 30% (complying with IEC 61000-3-2), and an efficiency of 90%.

J.m. Alonso - One of the best experts on this subject based on the ideXlab platform.

  • A Single-Stage High-Power-Factor Electronic Ballast Based on Integrated Buck Flyback Converter to Supply Metal Halide Lamps
    IEEE Transactions on Industrial Electronics, 2008
    Co-Authors: M.a. Dalla Costa, Jorge Garcia, João Miranda, J.m. Alonso, Diego G. Lamar
    Abstract:

    In this paper, a novel single-stage electronic ballast with a high power factor is presented. The ballast circuit is based on the integration of a buck converter to provide the power factor correction, and a flyback converter to control the Lamp power and to supply the Lamp with a low-frequency square-waveform current. Both converters work in discontinuous conduction mode, which simplifies the control. In spite of being an integrated topology, the circuit does not present additional stress of voltage or current in the main switch, which handles only the flyback or buck current, depending on the operation mode. To supply the Lamp with a low-frequency square-wave current to avoid acoustic resonances, the flyback has two secondary windings that operate complementarily at a low frequency. The design procedure of the converters is also detailed. Experimental results from a 35-W metal halide Lamp are presented, where the proposed ballast reached a power factor of 0.95, a total harmonic distortion of 30% (complying with IEC 61000-3-2), and an efficiency of 90%.

  • integrated zeta flyback electronic ballast to supply high intensity discharge Lamps
    IEEE Transactions on Industrial Electronics, 2007
    Co-Authors: Tiago Bandeira Marchesan, J.m. Alonso, M A Dallacosta, R Do N Prado
    Abstract:

    This paper proposes a metal halide Lamp electronic ballast based on the integration of zeta and flyback converters, which are used to achieve power factor correction and Lamp current stabilization, respectively. The proposed integrated converter allows to reduce the number of ballast components without increasing the current stress in the shared switch. Thus, the Lamp is supplied with a low-frequency square waveform that avoids the acoustic resonance phenomenon. The proposed topology has been implemented and validated by experimental results.

  • electronic ballast for hid Lamps with high frequency square waveform to avoid acoustic resonances
    Journal of Circuits Systems and Computers, 2004
    Co-Authors: M Ponce, A Lopez, J Correa, J Arau, J.m. Alonso
    Abstract:

    This paper presents a driver for a HID Lamp based on the application of a high frequency current square waveform through the Lamp with the goal of avoiding acoustic resonances. The proposed ballast is fed from a 12-V dc input voltage and is intended to be used in systems supplied from nonconventional sources, such as back-up batteries, photovoltaic generators and automotive applications. In order to initiate the discharge in the Lamp, a specially-designed igniter supplied from the 12-V dc voltage is used to apply high voltage ignition peaks to the Lamp. Experimental results obtained from a laboratory prototype for a 70-W Metal Halide Lamp supplied at 30 kHz are also shown to evaluate the possibilities of the proposed topology.