High-frequency dynamic current sharing analyses for multiphase buck VRs

被引：39
作者：
Sun, Juanjuan [1 ]
Qiu, Yang
Xu, Ming
Lee, Fred C.
机构：
[1] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA
[2] Analog Devices Inc, San Jose, CA 95134 USA
来源：
IEEE TRANSACTIONS ON POWER ELECTRONICS | 2007年 / 22卷 / 06期
基金：
美国国家科学基金会;
关键词：
beat frequency; current sharing; multiphase buck;
D O I：
10.1109/TPEL.2007.909303
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Under high-frequency repetitive load transients, multiphase voltage regulators suffer from beat-frequency oscillations of the phase currents. To investigate this issue, this paper develops a methodology based on the multifrequency model with describing functions. The phenomenon of beat-frequency oscillation in phase currents is explained. The influences from the interleaving operation are identified. Using peak-current control as an example, the magnitude of beat-frequency oscillations is predicted by a proposed model that considers sideband information. To reduce this oscillation without impacting the voltage regulation, several solutions are proposed. Experimental and simulation results are provided as verification of the analyses and solutions.
引用
收藏
页码：2424 / 2431
页数：8
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