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Techniques for efficient control of power converters.

机译：有效控制功率转换器的技术。

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摘要

There have been several advances in various areas of power converters in the past few decades. New technologies for passive components, switches and diodes have greatly reduced the size of power converters and have also increased their efficiency. The issues in control of power converters have been relatively sidelined with respect to issues in other areas of power conversion such as efficiency, magnetics, etc. This dissertation addresses issues in regard to the control of switching power converters and proposes solutions to improve the performance of the control loop.;Right half plane (RHP) zero, present in boost and buck-boost type converters, poses a major challenge for the control loop design of such converters. The zero restricts the bandwidth of the control loop and also results in lower phase margin for the control loop. This dissertation proposes a technique to eliminate the RHP zero from the control loop of boost converters. It is shown in the dissertation that it is possible to move the RHP zero and place it at a desired frequency in the left half plane. The proposed technique has been analyzed and various conclusions are drawn from the theory, simulations, and experimentation. Improvements to phase margin of the control loop using the proposed technique has been demonstrated on a prototype boost converter.;Other control related issue is the non-linear nature of boost and buck-boost converters which results in sub-optimal performance behavior, when they are designed to deliver a wide range of output voltages. The non-linear nature in boost converters is analyzed and the background of a non-linear control technique of input-output linearization is discussed and applied to boost converters. The dissertation proposes a novel technique called Adaptive Input Output Linearization (AIOL), to address the non-linear nature of boost converters. It is shown that the proposed non-linear control technique can be performed with the use of only analog components. The proposed adaptive technique works independent of the plant component values. Performance and stability of a prototype boost converter control loop with the proposed AIOL technique is demonstrated at various operating points of the output voltage. Lastly, the technique of AIOL is digitally implemented on Point of Load buck converters. It is shown that the technique provides tolerance to output capacitance variation over a wide range. Performance of the technique is experimentally verified and demonstrated on a prototype buck converter and the results are compared with traditional control loop design.
机译：在过去的几十年中，功率转换器的各个领域都取得了一些进步。无源元件，开关和二极管的新技术大大减小了功率转换器的尺寸，并提高了效率。在功率转换的其他领域，例如效率，磁性等方面，功率转换器的控制问题相对处于边缘状态。本论文解决了与开关功率转换器的控制有关的问题，并提出了解决方案，以提高功率转换器的性能。升压型和降压-升压型转换器中存在的右半平面（RHP）零对此类转换器的控制环设计提出了重大挑战。零限制了控制环路的带宽，也导致了控制环路的相位裕度较低。本文提出了一种从升压变换器的控制回路中消除RHP为零的技术。论文表明，可以将RHP调零并将其以所需的频率放置在左半平面中。对提出的技术进行了分析，并从理论，仿真和实验中得出了各种结论。已经在原型升压转换器上证明了使用所提出的技术改善控制回路的相位裕度的方法；其他与控制有关的问题是升压和降压-升压转换器的非线性特性，导致它们在达到最佳性能时设计用于提供广泛的输出电压。分析了升压转换器的非线性特性，讨论了输入输出线性化非线性控制技术的背景，并将其应用于升压转换器。论文提出了一种新的技术，称为自适应输入输出线性化（AIOL），以解决升压转换器的非线性特性。结果表明，所提出的非线性控制技术可以仅使用模拟组件来执行。所提出的自适应技术的工作与植物成分值无关。在输出电压的各个工作点上，使用提出的AIOL技术演示了升压转换器原型控制环路的性能和稳定性。最后，AIOL的技术在负载点降压转换器上以数字方式实现。结果表明，该技术可在宽范围内容忍输出电容变化。该技术的性能已在原型降压转换器上进行了实验验证和演示，并将结果与​​传统控制回路设计进行了比较。

著录项

  • 作者

    Paduvalli, Vikas V.;

  • 作者单位

    The University of Texas at Dallas.;

  • 授予单位 The University of Texas at Dallas.;
  • 学科 Electrical engineering.;Psychobiology.
  • 学位 Ph.D.
  • 年度 2016
  • 页码 138 p.
  • 总页数 138
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 康复医学;
  • 关键词

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