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首页> 外文学位 >MOSFET current source gate drivers, switching loss modeling and frequency dithering control for MHz switching frequency DC-DC converters.
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MOSFET current source gate drivers, switching loss modeling and frequency dithering control for MHz switching frequency DC-DC converters.

机译：MOSFET电流源栅极驱动器，用于MHz开关频率DC-DC转换器的开关损耗建模和频率抖动控制。

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摘要

The power density of a switching converter is dependent on the size of the power circuit components. Converters are operated in the hundreds of kHz to achieve high power density since the size of the converter reactive components decrease as frequency increases. Most present day low power (200W) DC-DC converters operate at switching frequencies up to 500kHz. Some research has been conducted on converters that can operate above 500kHz up to 4MHz. In the near future, most DC-DC switching converters for communications and computers will operate at switching frequencies of 1-10MHz in order to achieve greater power density and improved transient response. To meet the next generation requirements of these applications, four new ideas are proposed in this thesis.; The first contribution is a new current source gate drive circuit for power MOSFETs. The circuit provides a nearly constant gate current to reduce switching transition times and therefore switching loss in power MOSFETs. In addition, it can recover a portion of the gate energy normally dissipated in a conventional driver. Demonstrated loss reduction of 24.8% at 10V/5A load are presented in comparison to a conventional voltage source driver for a boost converter switching at 1MHz.; The second contribution is a new high efficiency 1MHz synchronous buck voltage regulator using an improved current source driver. The proposed circuit achieves short rise and fall times to reduce switching loss in the buck HS MOSFET. It also recovers a portion of the SR gate energy, enabling a loss reduction of 24% at 1.3V/30A load in comparison to a conventional driver.; In the third contribution, a new switching loss model is proposed for synchronous buck voltage regulators. The model uses simple closed form equations to calculate the rise and fall times and piecewise linear approximations of the HS MOSFET voltage and current waveforms to allow quick and accurate calculation of switching loss.; The final contribution is a new variable frequency digital control method for resonant converters, which is suitable for future applications switching at 10MHz. The proposed method uses frequency dithering to reduce the clock frequency demands of the digital controller.
机译：开关转换器的功率密度取决于功率电路组件的尺寸。转换器以数百kHz的频率运行以实现高功率密度，因为转换器电抗组件的尺寸随频率增加而减小。当今大多数低功耗（<200W）DC-DC转换器都以高达500kHz的开关频率工作。已经对可以在500kHz至4MHz以上的频率下工作的转换器进行了一些研究。在不久的将来，大多数用于通信和计算机的DC-DC开关转换器将以1-10MHz的开关频率工作，以实现更高的功率密度和改善的瞬态响应。为了满足这些应用的下一代需求，本文提出了四个新思路。第一个贡献是用于功率MOSFET的新型电流源栅极驱动电路。该电路提供了几乎恒定的栅极电流，以减少开关转换时间，从而减少功率MOSFET的开关损耗。另外，它可以恢复通常在常规驱动器中耗散的一部分栅极能量。与用于1MHz升压转换器开关的常规电压源驱动器相比，在10V / 5A负载下的损耗降低了24.8％。第二个贡献是使用改进的电流源驱动器的新型高效1MHz同步降压稳压器。所提出的电路实现了短的上升和下降时间，以减少降压HS MOSFET的开关损耗。与传统驱动器相比，它还可以回收一部分SR栅极能量，从而在1.3V / 30A负载下损耗降低了24％。在第三部分中，为同步降压稳压器提出了一种新的开关损耗模型。该模型使用简单的闭合形式方程式来计算HS MOSFET电压和电流波形的上升和下降时间以及分段线性逼近，从而可以快速而准确地计算开关损耗。最后的贡献是为谐振转换器提供了一种新型的变频数字控制方法，该方法适用于未来以10MHz开关的应用。所提出的方法使用频率抖动来降低数字控制器的时钟频率要求。

著录项

  • 作者

    Eberle, Wilson Allan Thomas.;

  • 作者单位

    Queen's University (Canada).;

  • 授予单位 Queen's University (Canada).;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 211 p.
  • 总页数 211
  • 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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