降压变换器用阶梯式气隙电感的设计与实现

Yu-Chen Liu, Meng-Chi Tsai, Ying-Jiun Chen, Katherine A. Kim, Chen Chen, N. A. Dung
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摘要

本文提出了一种用于改进反馈控制的降压变换器的阶梯式气隙电感器的设计和实现。通常,电源转换器需要在任何负载暂态期间保持稳定运行。根据传统的连续导通模式(CCM)方法设计变换器的补偿器时,从轻载到满载都采用相同的补偿器,导致某些工作点的响应较差,特别是在轻载时。为了获得更好的系统响应,提出了一种阶梯式气隙电感来增加轻载时的电感,并与传统电感进行了分析和比较。所提出的阶梯式气隙电感减小了漏磁对绕组的影响。讨论了两种不同电感值对控制器设计的影响,并概述了阶梯式气隙电感在轻载时产生断续导通模式的条件。建立了一个额定功率为60w的48v到12v降压变换器,并进行了测试,以验证所提出的阶梯式气隙电感。实验结果表明,与传统电感相比,该电感在轻负载到满载瞬态的过调量和欠调量分别提高了50%,稳定时间分别减少了20%和30%。因此,所提出的阶梯式气隙电感可以有效地改善系统的响应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Design and Implementation of a Stepped Air-Gap Inductor for Buck Converters
This paper proposes the design and implementation of an inductor with a stepped air-gap for a buck converter with improved feedback control. Typically, a power converter needs to maintain stable operation during any load transient. When designing the compensator for a converter according to the traditional method for continuous conduction mode (CCM), the same compensator is employed from light load to full load, which leads to poor response at some operating points, especially at light load. To achieve a better system response, a stepped air-gap inductor is proposed to increase the inductance at light load, which is analyzed and compared with a traditional inductor. The proposed stepped air-gap inductor reduces the influence of the magnetic flux leakage on the winding. The effect of having two different inductance values on the controller design is discussed, and the conditions for discontinuous conduction mode (DCM) at light load with the stepped air-gap inductor are outlined. A 48-V to 12-V buck converter rated for 60 W is built and tested to verify the proposed stepped air-gap inductor. With the proposed stepped air-gap inductor, experimental results show that undershoot and overshoot were improved 50% and settling time was decreased to 20% and 30% during light-to-full load transients, compared to the traditional inductor. Hence, the proposed stepped air-gap inductor can effectively improve system response.
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