Pseudo-Ramp Current Balance (PRCB) Technique for Voltage-Mode Multiphase Buck Converter

• Main Authors: Huang ,Yu-Ping, 黃玉萍
• Other Authors: Chen, Ke-Horng
• Format: Others
• Language: en_US
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/adp72d

碩士 === 國立交通大學 === 電控工程研究所 === 101 === A pseudo-ramp current balance (PRCB) technique is proposed to achieve the time-multiplexing (TM) current balance in voltage-mode multiphase DC-DC buck converter with only one modulation controller. Thus, compared to the conventional multiphase converter, the N-1 controllers can be removed when the PRCB technique is implemented in the monolithic N-phase DC-DC buck converters for largely decreasing the silicon area and power consumption. In addition, the TM current balance scheme can further enhance the current sharing accuracy since the mismatches between different controllers does not exist. Particularly, an explicit model of multiphase converter with the PRCB technique is derived for system stability analysis. Both of the voltage loop and the current balance loops with non-ideal effect are taken into consideration. Experimental results show that the current difference between each phase can be decreased by over 83 % at both heavy load and light load conditions.