Title

An Active Compensator Scheme for Dynamic Voltage Scaling of Voltage Regulators

Authors

Authors

S. Y. Xiao; W. H. Qiu; G. Miller; T. X. Wu;I. Batarseh

Abstract

Dynamic voltage scaling (DVS) technique is a common industry practice in optimizing power consumption of microprocessors by dynamically altering the supply voltage under different operational modes, while maintaining the performance requirements. During DVS operation, it is desirable to position the output voltage to a new level commanded by the microprocessor (CPU) with minimum delay. However, voltage deviation and slow settling time usually exist due to large output capacitance and compensation delay in voltage regulators. Although optimal DVS can be achieved by modifying the output capacitance and compensation, this method is limited by constraints from stringent static and dynamic requirements. In this paper, the effects of output capacitance and compensation network on DVS operation are discussed in detail. An active compensator scheme is then proposed to ensure smooth transition of the output voltage without change of power stage and compensation during DVS. Simulation and experimental results are included to demonstrate the effectiveness of the proposed scheme.

Journal Title

Ieee Transactions on Power Electronics

Volume

24

Issue/Number

1-2

Publication Date

1-1-2009

Document Type

Article

First Page

307

Last Page

311

WOS Identifier

WOS:000263458800031

ISSN

0885-8993

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