Small Signal Modeling of a High Bandwidth Voltage Regulator Using Coupled Inductors
作者： Ming Xu , Jinghai Zhou , Kaiwei Yao , Fred C. Lee
关键词: Current limiting 、 Sample and hold 、 Engineering 、 Current loop 、 Phase converter 、 Bandwidth (signal processing) 、 Buck converter 、 Voltage regulator 、 Inductor 、 Electronic engineering
摘要: Today's voltage regulator (VR) for the microprocessor requires a current loop to achieve adaptive positioning and phase sharing. A fundamental limitation, sample hold effect, limits control bandwidth be pushed beyond 1/6 of switching frequency. This paper reveals limitation two-phase buck converter using peak scheme. The can overcome by coupling two output inductors. new small signal model is proposed study effect in coupled-inductor implementations. relationship between coefficient then discussed. Based on these understandings, strongly coupled has double noncoupled VR; this experimentally verified
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