Analysis and Design of N-Phase Current-Sharing Autotuning Controller

作者：Abu Qahouq Jaber A^*

来源：IEEE Transactions on Power Electronics, 2010, 25(6): 1641-1651.

DOI：10.1109/TPEL.2009.2037892

• Adaptive
• autotuning
• calibration
• converter
• current sensing
• current sharing
• dc-dc
• digital control
• efficiency
• multiphase
• voltage regulator

Current sensing and sharing are important functionalities for parallel and multiphase power converters. Good current-sensing accuracy and high-performance current-sharing loop design are required for reliable and efficient operation. Therefore, sensing errors and mismatches in the current-sharing loop should be eliminated and calibrated. On the other hand, conventional current-sharing controllers are designed to force equal current sharing or current distribution between power converter phases, which may not result in the most power-efficient operation. An N-phase current-sharing algorithm and controller (NCSAT) with current-sensing autotuning capability is presented in this paper. The presented controller is able to adaptively autotune the current sensing and current sharing between N converter phases that results in achieving current sharing ratio between converter phases for maximum power efficiency. This is achieved without the need for a precise calibration reference or resistor and without the need for any converter's parameters estimation. The presented controller is also free of sensing inaccuracies and mismatches. The NCSAT controller is analyzed and verified by simulation and experimental results.

• 出版日期2010-6