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Low-power PFC and forward converters : methods to improve performance

机译:低功率PFC和正激转换器:提高性能的方法

摘要

The number of power electronic appliances is growing. Power electronic converters can be used to convert the ac line voltage to a dc voltage, and further through dc-dc conversion stages to desired dc voltages for different loads. This Thesis deals with three single-stage power factor correction converters and a forward type dc-dc converter.Single-stage converters can be considered as low cost solutions for power factor correction. This is because only one active switching stage is used in the converters. Small signal and steady state analysis are performed for the dither converter. A resonant type snubber is analyzed for the BIFRED and BIBRED converters and a new type of clamp circuit is developed for the BIFRED converter.The dc-dc conversion part of the Thesis deals with a forward converter with active clamp circuit and self-driven synchronous rectifiers. Resonant transition of the converter is analyzed in detail. Emphasis of the research is on improving the efficiency of the converter. Findings show that the minimization of the turn-on losses in the converter is not necessarily advantageous. The analysis is verified with a 3.4 V and 30 A prototype converter.
机译:电力电子设备的数量正在增长。功率电子转换器可用于将交流线路电压转换为直流电压,并进一步通过dc-dc转换级转换为不同负载所需的dc电压。本文涉及三个单级功率因数校正转换器和一个正向型dc-dc转换器。单级转换器可被视为用于功率因数校正的低成本解决方案。这是因为在转换器中仅使用了一个有源开关级。对抖动转换器执行小信号和稳态分析。分析了BIFRED和BIBRED转换器的谐振型缓冲器,并为BIFRED转换器开发了一种新型的钳位电路。本文的dc-dc转换部分涉及具有有源钳位电路和自驱动同步整流器的正激转换器。详细分析了转换器的谐振跃迁。研究的重点是提高转换器的效率。结果表明,转换器中导通损耗的最小化并不一定是有利的。该分析通过3.4 V和30 A原型转换器进行验证。

著录项

  • 作者

    Tuomainen Vesa;

  • 作者单位
  • 年度 2004
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  • 原文格式 PDF
  • 正文语种 en
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