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Investigation of high-density integrated solution for AC/DC conversion of a distributed power system.

机译：研究高密度集成解决方案的分布式电源系统的AC / DC转换。

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摘要

With the development of information technology, power management for telecom and computer applications become a large market for power supply industries. To meet the performance and reliability requirement, distributed power system (DPS) is widely adopted for telecom and computer systems, because of its modularity, maintainability and high reliability.; Due to limited space and increasing power consumption, power supplies for telecom and server systems are required to deliver more power with smaller volume. As the key component of DPS system, front-end AC/DC converter is under the pressure of continuously increasing power density. For conventional industry practices, some limitations prevents front-end converter meeting the power density requirement. In this dissertation, different techniques have been investigated to improve power density of front-end AC/DC converters.; For PFC stage, at low switching frequency, PFC inductor size is large and limits the power density. Although increasing switching frequency can dramatically reduce PFC inductor size, EMI filter size might be larger at higher switching frequency because of the change of noise spectrum. Since the relationship between EMI filter size and PFC switching frequency is unclear for industry, PFC circuits always operate with switching frequency lower than 150 kHz. Based on the EMI filter design method, together with a simple EMI noise prediction model, relationship between EMI filter corner frequency and PFC switching frequency was revealed. The analysis shows that switching frequency of PFC circuit should be higher than 400 kHz, so that both PFC inductor and EMI filter size can be reduced.; Although theoretical analysis and experimental results verify the benefits of high switching frequency PFC, it is essential to find a suitable topology that allows high switching frequency operation while maintains high efficiency. Three PFC topologies, single switch PFC, three-level PFC with range switch and dual Boost PFC, were evaluated with analysis and experiments. By using advanced semiconductor devices, together with proposed control methods, these topologies could achieve high efficiency at high switching frequency. Thus, the benefits of high frequency PFC can be realized. (Abstract shortened by UMI.)
机译：随着信息技术的发展，电信和计算机应用的电源管理已成为电源行业的巨大市场。为了满足性能和可靠性要求，分布式电源系统（DPS）的模块化，可维护性和高可靠性被广泛用于电信和计算机系统。由于空间有限和功耗的增加，需要用于电信和服务器系统的电源以较小的体积提供更多的电源。作为DPS系统的关键组件，前端AC / DC转换器承受着不断提高的功率密度的压力。对于常规的行业惯例，某些限制会阻止前端转换器满足功率密度要求。本文研究了提高前端AC / DC转换器功率密度的各种技术。对于PFC级，在低开关频率下，PFC电感器尺寸较大，并限制了功率密度。尽管增加开关频率可以显着减小PFC电感器的尺寸，但由于噪声频谱的变化，在较高开关频率下EMI滤波器的尺寸可能会更大。由于工业界尚不清楚EMI滤波器尺寸与PFC开关频率之间的关系，因此PFC电路始终以低于150 kHz的开关频率工作。基于EMI滤波器的设计方法，结合简单的EMI噪声预测模型，揭示了EMI滤波器转折频率与PFC开关频率之间的关系。分析表明，PFC电路的开关频率应高于400 kHz，从而可以减小PFC电感器和EMI滤波器的尺寸。尽管理论分析和实验结果证明了高开关频率PFC的好处，但找到合适的拓扑结构以允许高开关频率工作并保持高效率至关重要。通过分析和实验评估了三种PFC拓扑，即单开关PFC，带范围开关的三级PFC和双Boost PFC。通过使用先进的半导体器件以及建议的控制方法，这些拓扑可以在高开关频率下实现高效率。因此，可以实现高频PFC的益处。 （摘要由UMI缩短。）

著录项

  • 作者

    Lu, Bing.;

  • 作者单位

    Virginia Polytechnic Institute and State University.;

  • 授予单位 Virginia Polytechnic Institute and State University.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 225 p.
  • 总页数 225
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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