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Small Signal Modeling of a High Bandwidth Voltage Regulator Using Coupled Inductors

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4 Author(s)
Ming Xu ; Dept. of Electr. & Comput. Eng., Virginia Polytech. Inst. & State Univ. ; Zhou, J. ; Yao, K. ; Lee, F.C.

Today's voltage regulator (VR) for the microprocessor requires a current loop to achieve adaptive voltage positioning and phase current sharing. A fundamental limitation, current loop sample hold effect, limits the control bandwidth to be pushed beyond 1/6 of the switching frequency. This paper reveals the limitation of the control bandwidth of a two-phase buck converter using peak current control scheme. The limitation can be overcome by coupling the two output inductors. A new small signal model is proposed to study the sample hold effect in coupled-inductor implementations. The relationship between the coupling coefficient and the sample hold effect is then discussed. Based on these understandings, a strongly coupled two-phase buck converter has double the bandwidth of the noncoupled VR; and this is experimentally verified

Published in:

Power Electronics, IEEE Transactions on  (Volume:22 ,  Issue: 2 )

Date of Publication:

March 2007

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