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An investigation of fundamental frequency limitations for HF/VHF power conversion.

机译：研究HF / VHF功率转换的基本频率限制。

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摘要

The volume reduction in power converters over the past several decades can chiefly be attributed to increases in switching frequency. It is to be expected that the trends towards miniaturization will maintain steady pressure to keep this pace of increasing switching frequencies of power converters. However certain fundamental limits in high frequency power conversion are being reached as frequencies are being pushed deeper into the megahertz range, inhibiting substantial further increases.; The work reported in this dissertation is intended to systematically investigate the fundamental frequency limitations, identify some of the solutions for HF/VHF power conversion and to provide guidelines and tools to optimize the performance of power converters by maximizing frequency.; A number of multi-megahertz power converters are examined to evaluate the present status and future trend of HF/VHF power conversion. An interesting trend between power level and frequency is observed. A general limitation about the power level and frequency, independent of design details, is derived from the physics of the semiconductor devices, which determines the upper bound of the power levels as frequency increases.; A 250 MHz DC-DC power converter (derived from the Class E power amplifier) is analyzed and demonstrated with discrete components, which again verifies the trend between power level and frequency. The power losses in the semiconductor devices are discussed, and optimization criteria for minimizing the power losses of the devices, are discussed. By relating the power losses to the semiconductor materials' properties, a methodology for selecting proper materials is identified for high frequency and high efficiency power conversion.; The frequency scaling effects of passive components, still dominating the volume of the modern power converter, is analyzed. A generic multi-disciplinary methodology is developed to analyze and maximize frequency and performance of passive components in terms of power density and efficiency. It is demonstrated how the optimum frequency can be identified, and how power conversion efficiency deteriorates beyond this optimum under a fixed maximum temperature.; Power loss measurement is becoming more challenging as higher frequency and higher efficiency power conversion. To achieve an accurate power loss measurement in a high frequency, high efficiency power electronics system or component, limitations of electrical measurement are identified, and various calorimetric methods are surveyed. Calorimetric methods are more accurate due to the direct heat loss measurement. An advanced calorimetric system is proposed, analyzed, and tested, demonstrating about 5% error in total losses up to 25W.
机译：过去几十年来，功率转换器的体积减少主要归因于开关频率的增加。可以预见的是，朝着小型化的趋势将保持稳定的压力，以保持功率转换器的开关频率不断提高的步伐。然而，随着频率被推至兆赫兹范围之内，高频功率转换已达到某些基本极限，从而抑制了进一步的大幅增长。本文的工作旨在系统地研究基本频率限制，确定用于HF / VHF功率转换的一些解决方案，并提供指导和工具，以通过最大化频率来优化功率转换器的性能。研究了许多兆赫兹功率转换器，以评估HF / VHF功率转换的现状和未来趋势。观察到功率水平和频率之间的有趣趋势。不依赖于设计细节，关于功率电平和频率的一般限制是从半导体器件的物理原理得出的，其随着频率的增加确定功率电平的上限。对250 MHz DC-DC电源转换器（源自E类功率放大器）进行了分析，并通过分立元件进行了演示，这再次验证了功率水平和频率之间的趋势。讨论了半导体器件中的功率损耗，并讨论了用于最小化器件功率损耗的优化标准。通过将功率损耗与半导体材料的特性联系起来，可以确定一种选择合适材料的方法，以进行高频和高效功率转换。分析了仍然占据着现代功率转换器体积的无源元件的频率缩放效应。开发了一种通用的多学科方法，以分析和最大化功率密度和效率方面的无源组件的频率和性能。演示了如何确定最佳频率，以及在固定的最高温度下功率转换效率如何降低到超过该最佳频率。随着更高频率和更高效率的功率转换，功率损耗测量正变得越来越具有挑战性。为了在高频，高效电力电子系统或组件中实现准确的功率损耗测量，必须确定电气测量的局限性，并研究各种量热方法。由于直接进行热损失测量，因此量热法更加准确。提出，分析和测试了一种先进的量热系统，在高达25W的总损耗中显示出约5％的误差。

著录项

  • 作者

    Xiao, Chucheng.;

  • 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 212 p.
  • 总页数 212
  • 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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