多模式运行下带气隙PFC电感线圈的功率损耗与温度分布
Power Loss and Temperature Distribution in Coil of PFC Inductor with Air Gap for Multimode Operation
AI总结：
本文研究升压型PFC电感在DCM、CCM及混合导通模式下功率损耗与温度分布的差异，重点分析气隙边缘效应和高频涡流机制，并通过优化线圈结构降低功率损耗。
摘要：
功率变换器本质上呈现非线性负载特性，导致电网谐波水平较高，因此有必要实施功率因数校正（PFC）。有源PFC电路通常包含一个电感和一个功率开关，用于控制和改变输入电流，使其在形状和相位上与输入电压相匹配。这种波形建模可以通过PFC电感的不同导通模式来实现。在所构建并研究的升压型PFC变换器中，所实现的数字控制器可以被编程为在断续导通模式（DCM）、连续导通模式（CCM）或两者的组合模式下运行。不同的运行模式通过不同的PFC电感电流波形，影响功率转换的整体效率，进而影响磁性元件中的温度分布。本文研究了所考察的导通模式如何影响PFC电感中存在的不同功率损耗机制，包括高频涡流产生现象，特别是边缘效应。如本文所示，在设定的输出功率水平下，DCM运行由于电流的RMS值有所增加以及气隙处边缘磁通的增强，表现出电感绕组中功率耗散的加剧。后一论断将进行进一步的、更侧重于定量分析的研究。最后，通过削弱涡流机制对线圈结构进行了优化，以降低功率损耗。
英文摘要：
Power converters inherently display non-linear load characteristics, resulting in a high level of mains harmonics, and hence the necessity of implementing Power Factor Correction (PFC). Active PFC circuitry typically comprises an inductor and a power switch to control and alter the input current so that it matches, in shape and phase, the input voltage. This modelling of the waveforms can be performed by means of distinct conduction modes of the PFC inductor. The digital controller implemented in the constructed and investigated boost-type PFC converter can be programmed to operate in discontinuous conduction mode (DCM), continuous conduction mode (CCM), or a combination of the two. The individual modes of operation, via distinct PFC inductor current waveforms, impact the overall efficiency of power conversion and, by extension, temperature distribution in the magnetic component. This paper investigates how the examined conduction modes bear on distinct power-loss mechanisms present in the PFC inductor, including high-frequency eddy-current-generating phenomena, and the fringing effect in particular. As demonstrated herein, the DCM operation, for the set output power level, exhibits exacerbated power dissipation in the winding of the inductor due to the somewhat increased RSM value of the current and the intensified fringing magnetic flux at an air gap. The latter assertion will undergo further, more quantitatively focused research. Finally, the construction of the coil was optimised to reduce power loss by diminishing eddy-current mechanisms.
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