The Experts below are selected from a list of 162 Experts worldwide ranked by ideXlab platform

Wataru Kitagawa - One of the best experts on this subject based on the ideXlab platform.

  • Soft-Switching PWM Technique for Grid-Tie Isolated Bidirectional DC–AC Converter With SiC Device
    IEEE Transactions on Industry Applications, 2017
    Co-Authors: Mahmoud A. Sayed, Kazuma Suzuki, Takaharu Takeshita, Wataru Kitagawa
    Abstract:

    Soft-switching techniques have become very attractive in bidirectional grid-tie dc–ac converters utilizing high-frequency link transformers for galvanic isolation. This paper presents a new pulse-width modulation (PWM) switching technique for controlling a bidirectional isolated dc–ac–ac converter along with its soft-switching method. The proposed PWM technique has the ability to control the input dc current and to inject a sinusoidal three-phase current to the grid at unity power factor. In the first stage, an H-Bridge converter is used to convert the dc Voltage to a high-frequency square-wave single-phase Voltage. In the second stage, a matrix converter is used to convert the high-frequency Voltage waveform to conventional three-phase Voltage synchronized with the grid. Therefore, a single-phase high-frequency transformer is used to link the H-Bridge Output Voltage to the matrix converter input Voltage. The proposed soft-switching technique is achieved by connecting shunt ceramic capacitors across all converter switches. The mathematical model and the circuit operation for soft-switching are presented along with the Voltage controllable limits. The effectiveness of the proposed technique has been verified experimentally using a laboratory prototype.

  • New PWM technique for grid-tie isolated bidirectional DC-AC inverter based high frequency transformer
    2016 IEEE Energy Conversion Congress and Exposition (ECCE), 2016
    Co-Authors: Mahmoud A. Sayed, Kazuma Suzuki, Takaharu Takeshita, Wataru Kitagawa
    Abstract:

    This paper presents a new PWM switching technique for controlling a bidirectional isolated DC-AC-AC inverter along with its soft-switching technique. The proposed PWM technique has the ability to control the input DC current and to inject a sinusoidal three-phase current to the grid at unity power factor. In the first stage, an H-Bridge converter is used to convert the DC Voltage to a high-frequency square-wave single-phase Voltage. In the second stage, a matrix converter is used to convert the high-frequency Voltage waveform to conventional three-phase Voltage synchronized with the grid. Therefore, a high-frequency transformer is used to link the H-Bridge Output Voltage to the matrix converter input Voltage. The proposed soft-switching technique is achieved by connecting shunt capacitors across the DC-AC-AC converter switches. The mathematical model and the circuit operation for soft-switching are presented along with the Voltage controllable limits. The effectiveness of the proposed technique has been verified experimentally using a laboratory prototype.

Mahmoud A. Sayed - One of the best experts on this subject based on the ideXlab platform.

  • Soft-Switching PWM Technique for Grid-Tie Isolated Bidirectional DC–AC Converter With SiC Device
    IEEE Transactions on Industry Applications, 2017
    Co-Authors: Mahmoud A. Sayed, Kazuma Suzuki, Takaharu Takeshita, Wataru Kitagawa
    Abstract:

    Soft-switching techniques have become very attractive in bidirectional grid-tie dc–ac converters utilizing high-frequency link transformers for galvanic isolation. This paper presents a new pulse-width modulation (PWM) switching technique for controlling a bidirectional isolated dc–ac–ac converter along with its soft-switching method. The proposed PWM technique has the ability to control the input dc current and to inject a sinusoidal three-phase current to the grid at unity power factor. In the first stage, an H-Bridge converter is used to convert the dc Voltage to a high-frequency square-wave single-phase Voltage. In the second stage, a matrix converter is used to convert the high-frequency Voltage waveform to conventional three-phase Voltage synchronized with the grid. Therefore, a single-phase high-frequency transformer is used to link the H-Bridge Output Voltage to the matrix converter input Voltage. The proposed soft-switching technique is achieved by connecting shunt ceramic capacitors across all converter switches. The mathematical model and the circuit operation for soft-switching are presented along with the Voltage controllable limits. The effectiveness of the proposed technique has been verified experimentally using a laboratory prototype.

  • New PWM technique for grid-tie isolated bidirectional DC-AC inverter based high frequency transformer
    2016 IEEE Energy Conversion Congress and Exposition (ECCE), 2016
    Co-Authors: Mahmoud A. Sayed, Kazuma Suzuki, Takaharu Takeshita, Wataru Kitagawa
    Abstract:

    This paper presents a new PWM switching technique for controlling a bidirectional isolated DC-AC-AC inverter along with its soft-switching technique. The proposed PWM technique has the ability to control the input DC current and to inject a sinusoidal three-phase current to the grid at unity power factor. In the first stage, an H-Bridge converter is used to convert the DC Voltage to a high-frequency square-wave single-phase Voltage. In the second stage, a matrix converter is used to convert the high-frequency Voltage waveform to conventional three-phase Voltage synchronized with the grid. Therefore, a high-frequency transformer is used to link the H-Bridge Output Voltage to the matrix converter input Voltage. The proposed soft-switching technique is achieved by connecting shunt capacitors across the DC-AC-AC converter switches. The mathematical model and the circuit operation for soft-switching are presented along with the Voltage controllable limits. The effectiveness of the proposed technique has been verified experimentally using a laboratory prototype.

Takaharu Takeshita - One of the best experts on this subject based on the ideXlab platform.

  • Soft-Switching PWM Technique for Grid-Tie Isolated Bidirectional DC–AC Converter With SiC Device
    IEEE Transactions on Industry Applications, 2017
    Co-Authors: Mahmoud A. Sayed, Kazuma Suzuki, Takaharu Takeshita, Wataru Kitagawa
    Abstract:

    Soft-switching techniques have become very attractive in bidirectional grid-tie dc–ac converters utilizing high-frequency link transformers for galvanic isolation. This paper presents a new pulse-width modulation (PWM) switching technique for controlling a bidirectional isolated dc–ac–ac converter along with its soft-switching method. The proposed PWM technique has the ability to control the input dc current and to inject a sinusoidal three-phase current to the grid at unity power factor. In the first stage, an H-Bridge converter is used to convert the dc Voltage to a high-frequency square-wave single-phase Voltage. In the second stage, a matrix converter is used to convert the high-frequency Voltage waveform to conventional three-phase Voltage synchronized with the grid. Therefore, a single-phase high-frequency transformer is used to link the H-Bridge Output Voltage to the matrix converter input Voltage. The proposed soft-switching technique is achieved by connecting shunt ceramic capacitors across all converter switches. The mathematical model and the circuit operation for soft-switching are presented along with the Voltage controllable limits. The effectiveness of the proposed technique has been verified experimentally using a laboratory prototype.

  • New PWM technique for grid-tie isolated bidirectional DC-AC inverter based high frequency transformer
    2016 IEEE Energy Conversion Congress and Exposition (ECCE), 2016
    Co-Authors: Mahmoud A. Sayed, Kazuma Suzuki, Takaharu Takeshita, Wataru Kitagawa
    Abstract:

    This paper presents a new PWM switching technique for controlling a bidirectional isolated DC-AC-AC inverter along with its soft-switching technique. The proposed PWM technique has the ability to control the input DC current and to inject a sinusoidal three-phase current to the grid at unity power factor. In the first stage, an H-Bridge converter is used to convert the DC Voltage to a high-frequency square-wave single-phase Voltage. In the second stage, a matrix converter is used to convert the high-frequency Voltage waveform to conventional three-phase Voltage synchronized with the grid. Therefore, a high-frequency transformer is used to link the H-Bridge Output Voltage to the matrix converter input Voltage. The proposed soft-switching technique is achieved by connecting shunt capacitors across the DC-AC-AC converter switches. The mathematical model and the circuit operation for soft-switching are presented along with the Voltage controllable limits. The effectiveness of the proposed technique has been verified experimentally using a laboratory prototype.

Kazuma Suzuki - One of the best experts on this subject based on the ideXlab platform.

  • Soft-Switching PWM Technique for Grid-Tie Isolated Bidirectional DC–AC Converter With SiC Device
    IEEE Transactions on Industry Applications, 2017
    Co-Authors: Mahmoud A. Sayed, Kazuma Suzuki, Takaharu Takeshita, Wataru Kitagawa
    Abstract:

    Soft-switching techniques have become very attractive in bidirectional grid-tie dc–ac converters utilizing high-frequency link transformers for galvanic isolation. This paper presents a new pulse-width modulation (PWM) switching technique for controlling a bidirectional isolated dc–ac–ac converter along with its soft-switching method. The proposed PWM technique has the ability to control the input dc current and to inject a sinusoidal three-phase current to the grid at unity power factor. In the first stage, an H-Bridge converter is used to convert the dc Voltage to a high-frequency square-wave single-phase Voltage. In the second stage, a matrix converter is used to convert the high-frequency Voltage waveform to conventional three-phase Voltage synchronized with the grid. Therefore, a single-phase high-frequency transformer is used to link the H-Bridge Output Voltage to the matrix converter input Voltage. The proposed soft-switching technique is achieved by connecting shunt ceramic capacitors across all converter switches. The mathematical model and the circuit operation for soft-switching are presented along with the Voltage controllable limits. The effectiveness of the proposed technique has been verified experimentally using a laboratory prototype.

  • New PWM technique for grid-tie isolated bidirectional DC-AC inverter based high frequency transformer
    2016 IEEE Energy Conversion Congress and Exposition (ECCE), 2016
    Co-Authors: Mahmoud A. Sayed, Kazuma Suzuki, Takaharu Takeshita, Wataru Kitagawa
    Abstract:

    This paper presents a new PWM switching technique for controlling a bidirectional isolated DC-AC-AC inverter along with its soft-switching technique. The proposed PWM technique has the ability to control the input DC current and to inject a sinusoidal three-phase current to the grid at unity power factor. In the first stage, an H-Bridge converter is used to convert the DC Voltage to a high-frequency square-wave single-phase Voltage. In the second stage, a matrix converter is used to convert the high-frequency Voltage waveform to conventional three-phase Voltage synchronized with the grid. Therefore, a high-frequency transformer is used to link the H-Bridge Output Voltage to the matrix converter input Voltage. The proposed soft-switching technique is achieved by connecting shunt capacitors across the DC-AC-AC converter switches. The mathematical model and the circuit operation for soft-switching are presented along with the Voltage controllable limits. The effectiveness of the proposed technique has been verified experimentally using a laboratory prototype.

Tan, Chuan Seng - One of the best experts on this subject based on the ideXlab platform.

  • Design, Simulation and Characterization of Wheatstone Bridge Structured Metal Thin Film Uncooled Microbolometer
    Chuan Seng Tan. Published by Elsevier Ltd., 2014
    Co-Authors: Ang, Wan Chia, Kropelnicki Piotr, Tsai, Julius Ming Lin, Leong, Kam Chew, Tan, Chuan Seng
    Abstract:

    AbstractIt is demonstrated for the first time that the Wheatstone Bridge structured metal thin film resistive uncooled microbolometer (in short, WB-bolometer) provides promising temperature sensitivity. This paper describes the design, simulation, and characterization of WB-bolometer using titanium nitride (TiN) thin film as the infrared (IR) sensing material. TiN thin film is designed into four resistors which are connected to each other in Wheatstone Bridge configuration. The resistance value of each resistor changes with different rates upon IR absorption, which can be attributed to the difference in their associated thermal conductance. As a result, the Bridge Output Voltage varies in response to the absorbed IR power. Simulation was employed to compare and characterize different designs of WB-bolometer. It was found that design with two sensing elements has the optimum performance. The proposed WB-bolometer is also capable of operating at elevated temperatures (> 250 oC) due to its adjustable and small initial offset Voltage with minimum associated noise

  • Design, simulation and characterization of wheatstone Bridge structured metal thin film uncooled microbolometer
    'Elsevier BV', 2014
    Co-Authors: Ang, Wan Chia, Kropelnicki Piotr, Tsai, Julius Ming Lin, Leong, Kam Chew, Tan, Chuan Seng
    Abstract:

    It is demonstrated for the first time that the Wheatstone Bridge structured metal thin film resistive uncooled microbolometer (in short, WB-bolometer) provides promising temperature sensitivity. This paper describes the design, simulation, and characterization of WB-bolometer using titanium nitride (TiN) thin film as the infrared (IR) sensing material. TiN thin film is designed into four resistors which are connected to each other in Wheatstone Bridge configuration. The resistance value of each resistor changes with different rates upon IR absorption, which can be attributed to the difference in their associated thermal conductance. As a result, the Bridge Output Voltage varies in response to the absorbed IR power. Simulation was employed to compare and characterize different designs of WB-bolometer. It was found that design with two sensing elements has the optimum performance. The proposed WB-bolometer is also capable of operating at elevated temperatures (> 250 oC) due to its adjustable and small initial offset Voltage with minimum associated noise.Published versio