Title: Time-Shift Current Balance Technique in Four-Phase Voltage Regulator Module with 90% Efficiency for Cloud Computing
Authors: Su, Yi-Ping
Chen, Wei-Chung
Huang, Yu-Ping
Chen, Chun-Yen
Ni, Chia-Lung
Chen, Ke-Horng
Institute of Electrical and Control Engineering
Keywords: Cloud computing;ramp-amplitude adjustable current balance technique;time-shift current balance (TSCB);voltage identification (VID);voltage regulator module (VRM)
Issue Date: 1-Mar-2015
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.
URI: http://dx.doi.org/10.1109/TPEL.2014.2321177
ISSN: 0885-8993
DOI: 10.1109/TPEL.2014.2321177
Volume: 30
Begin Page: 1521
End Page: 1534
Appears in Collections:Articles