A single phase parallel power processing scheme with power factor control

R. Srinivasan, R. Oruganti
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引用次数: 17

Abstract

With the enforcement of the agency standards such as IEC-555-2 for the harmonic components of the input line current, conventional single phase AC/DC power converters with rectifier-capacitor type input interface can no longer be used in switch mode power supplies except for power levels below 75 W. As a result, several alternative AC/DC converters, called power factor corrected (PFC) converters, meeting the agency requirements have been proposed. Most of these achieve near sinusoidal input current irrespective of power levels. However, for lower power levels, IEC-555-2 does not require a sinusoidal input current. Realising this, a parallel power processing scheme is proposed. Here, a conventional offline converter is paralleled with a PFC converter resulting in less overall power handled and thus in improved efficiency. Excellent output dynamics is achieved by two control methods. Method 1 proposes to cancel the second harmonic (100 Hz) current component injected into the output capacitor by the PFC converter. The input harmonic performance was improved further in method 2 which may be viewed as a modification of method 1. SABER simulation using both switched models and averaged models are utilised to confirm the anticipated good performance of the proposed scheme.<>
一种具有功率因数控制的单相并联功率处理方案
随着IEC-555-2等机构标准对输入线路电流谐波分量的强制执行,除功率低于75w外,具有整流-电容型输入接口的传统单相AC/DC电源转换器不能再用于开关模式电源。因此,已经提出了几种替代AC/DC转换器,称为功率因数校正(PFC)转换器,满足机构要求。大多数这些实现接近正弦输入电流,而不考虑功率水平。然而,对于较低的功率水平,IEC-555-2不需要正弦输入电流。为此,提出了一种并行功率处理方案。在这里,传统的脱机转换器与PFC转换器并联,导致更少的总功率处理,从而提高了效率。通过两种控制方法实现了优异的输出动态特性。方法1建议取消PFC变换器注入输出电容的二次谐波(100hz)电流分量。在方法2中进一步改善了输入谐波性能,这可以看作是对方法1的修改。使用切换模型和平均模型的SABER仿真证实了所提出方案的预期良好性能
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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