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

Zhaoming Qian - One of the best experts on this subject based on the ideXlab platform.

  • Optimum Design Consideration and Implementation of a Novel Synchronous Rectified Soft-Switched Phase-Shift Full-Bridge Converter for Low-Output-Voltage High-Output-Current Applications
    IEEE Transactions on Power Electronics, 2009
    Co-Authors: Chen Zhao, Xinke Wu, Peipei Meng, Zhaoming Qian
    Abstract:

    Optimum Design Consideration and implementation of a novel synchronous rectified soft-switched phase-shift full-bridge dc/dc converter with a primary-side energy storage inductor for server adapter application is presented in this paper. By employing a primary-side energy storage inductor, the main switches can achieve a soft-switching condition, and there is little reverse recovery loss in the body diodes of a secondary-side rectifier due to relatively slow downslope of the triangular current. Since the output capacitive filter reduces the voltage stress across the rectifiers, the synchronous rectifier with a lower breakdown voltage rate can be utilized to improve the conversion efficiency dramatically. Thus, this converter can obtain relatively high conversion efficiency for some medium-power applications with low output voltage and high output current, such as the server adapter. Several key optimum Design Considerations of this converter are also presented in detail in this paper. Finally, a 100-kHz, 300-W (12 V/25 A) laboratory-made prototype for a given server adapter application is built up based on the proposed optimum Design procedure of this converter to verify all the theoretical analysis and evaluations.

  • The Design Consideration Comparisons of Two Clamping Modes Over Current Protection for LLC Converter
    INTELEC 06 - Twenty-Eighth International Telecommunications Energy Conference, 2006
    Co-Authors: Chen Zhao, Xinke Wu, Junming Zhang, Zhaoming Qian
    Abstract:

    The over current protection is a difficult issue for LLC resonant converter Design due to its variable frequency operation mode. Using clamping mode to achieve the over current protection can reduce the frequency range for Design. However, clamping modes also have some drawbacks and some of them should be taken into account especially during the Design processes. This paper focuses on the Design Consideration comparisons of two typical over current protections by using clamping mode for LLC resonant converter. Finally, an 110 V/10 A prototype is built up to verify the theoretic comparison results

T. Ogura - One of the best experts on this subject based on the ideXlab platform.

  • Blocking voltage Design Consideration for deep trench MOS gate high power devices
    Proceedings of International Symposium on Power Semiconductor Devices and IC's: ISPSD '95, 1995
    Co-Authors: K. Matsushita, I. Omura, T. Ogura
    Abstract:

    This paper describes, for the first time, the possibility of realizing a deep trench gate device with high blocking voltage. For a trench gate device with 4.5 kV blocking voltage, the influence of the trench gate geometrical parameters on the breakdown voltage is analyzed using the two-dimensional breakdown voltage simulator TONADDE II B. The breakdown voltage decreases as the p-base width increases. On the other hand, the breakdown voltage increases as the trench gate width increases. The breakdown voltage is independent of the trench gate depth from the p-n junction in the region from 8 to 20 /spl mu/m. Assuming that the trench gate width is 1 /spl mu/m, the maximum p-base width to realize 4.5 kV blocking voltage is about 6 /spl mu/m. Therefore, it is concluded that a 4.5 kV blocking voltage of a deep trench gate device is attainable by the present process technology.

Chen Zhao - One of the best experts on this subject based on the ideXlab platform.

  • Optimum Design Consideration and Implementation of a Novel Synchronous Rectified Soft-Switched Phase-Shift Full-Bridge Converter for Low-Output-Voltage High-Output-Current Applications
    IEEE Transactions on Power Electronics, 2009
    Co-Authors: Chen Zhao, Xinke Wu, Peipei Meng, Zhaoming Qian
    Abstract:

    Optimum Design Consideration and implementation of a novel synchronous rectified soft-switched phase-shift full-bridge dc/dc converter with a primary-side energy storage inductor for server adapter application is presented in this paper. By employing a primary-side energy storage inductor, the main switches can achieve a soft-switching condition, and there is little reverse recovery loss in the body diodes of a secondary-side rectifier due to relatively slow downslope of the triangular current. Since the output capacitive filter reduces the voltage stress across the rectifiers, the synchronous rectifier with a lower breakdown voltage rate can be utilized to improve the conversion efficiency dramatically. Thus, this converter can obtain relatively high conversion efficiency for some medium-power applications with low output voltage and high output current, such as the server adapter. Several key optimum Design Considerations of this converter are also presented in detail in this paper. Finally, a 100-kHz, 300-W (12 V/25 A) laboratory-made prototype for a given server adapter application is built up based on the proposed optimum Design procedure of this converter to verify all the theoretical analysis and evaluations.

  • The Design Consideration Comparisons of Two Clamping Modes Over Current Protection for LLC Converter
    INTELEC 06 - Twenty-Eighth International Telecommunications Energy Conference, 2006
    Co-Authors: Chen Zhao, Xinke Wu, Junming Zhang, Zhaoming Qian
    Abstract:

    The over current protection is a difficult issue for LLC resonant converter Design due to its variable frequency operation mode. Using clamping mode to achieve the over current protection can reduce the frequency range for Design. However, clamping modes also have some drawbacks and some of them should be taken into account especially during the Design processes. This paper focuses on the Design Consideration comparisons of two typical over current protections by using clamping mode for LLC resonant converter. Finally, an 110 V/10 A prototype is built up to verify the theoretic comparison results

Guozhen Shen - One of the best experts on this subject based on the ideXlab platform.

  • Flexible energy-storage devices: Design Consideration and recent progress
    Advanced Materials, 2014
    Co-Authors: Xiao Fei Wang, Ye Xiang Tong, Bin Liu, Xihong Lu, Xianfu Wang, Di Chen, Guozhen Shen
    Abstract:

    Flexible energy-storage devices are attracting increasing attention as they show unique promising advantages, such as flexibility, shape diversity, light weight, and so on; these properties enable applications in portable, flexible, and even wearable electronic devices, including soft electronic products, roll-up displays, and wearable devices. Consequently, considerable effort has been made in recent years to fulfill the requirements of future flexible energy-storage devices, and much progress has been witnessed. This review describes the most recent advances in flexible energy-storage devices, including flexible lithium-ion batteries and flexible supercapacitors. The latest successful examples in flexible lithium-ion batteries and their technological innovations and challenges are reviewed first. This is followed by a detailed overview of the recent progress in flexible supercapacitors based on carbon materials and a number of composites and flexible micro-supercapacitors. Some of the latest achievements regarding interesting integrated energy-storage systems are also reviewed. Further research direction is also proposed to surpass existing technological bottle-necks and realize idealized flexible energy-storage devices.

Alex Q. Huang - One of the best experts on this subject based on the ideXlab platform.

  • Thermal Design Consideration of Medium Voltage High Frequency Transformers
    2020 IEEE Applied Power Electronics Conference and Exposition (APEC), 2020
    Co-Authors: Haoming Wang, Milad S. Tayebi, Xin Zhao, Qingyun Huang, Ruiyang Yu, Qingxin Yang, Yongjian Li, Alex Q. Huang
    Abstract:

    This paper describes a thermal Design using epoxy potting for high frequency transformer (HFT) for medium voltage high power electronic applications, namely emerging solid-state transformers. To address HFT’s thermal stress problem, thermal performance of the HFT with air and epoxy potting cooling method are both simulated by magnetothermal-fluid coupling method (MTFCM). The effectiveness of the simulation analysis is verified in a 100 kW DC-DC resonant converter. Influencing factors including distance between the high frequency transformer and the metal enclosure, epoxy thermal conductivity and heat sink placements are simulated and analyzed. Finally, an optimal cooling structure is proposed for future high power HFTs.