Time-shift current balance technique in four-phase voltage regulator module with 90% efficiency for cloud computing

Yi Ping Su*, Wei Chung Chen, Yu Ping Huang, Chun Yen Chen, Chia Lung Ni, Ke-Horng Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Four power stages for voltage regulator module (VRM) are adopted to provide high current driving capability and low output ripple in cloud computing. Thus, the time-shift current balance (TSCB) technique is proposed to achieve high performance power supply for servers. In addition, the power request, which includes the number of active phases and voltage identification, is acknowledged by servers for high driving capability during high throughput and high efficiency during standby mode. Furthermore, to equally distribute the current in each phase, the proposed TSCB technique in either voltage-mode or peak current-mode control improves the current balance performance and solves the stability problem. In the scale-down clouding computing prototype, the efficiency can be kept higher than 90% over a wide load current range of 2 A. In addition, the performance and operating frequency of the servers in stable operation are not limited by the VRM with the TSCB technique.

Original languageEnglish
Article number6808507
Pages (from-to)1521-1534
Number of pages14
JournalIEEE Transactions on Power Electronics
Volume30
Issue number3
DOIs
StatePublished - 1 Jan 2014

Keywords

  • Cloud computing
  • ramp-amplitude adjustable current balance technique
  • time-shift current balance (TSCB)
  • voltage identification (VID)
  • voltage regulator module (VRM)

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