Sigma-Delta Modulation of Multi-Phase High Frequency Converters
A power conversion control architecture is proposed that merges advanced digital modulation techniques, high frequency resonant converters, and multi-phase converters. If a converter's switching frequency is high enough, the converter may be turned on and off quickly to modulate power flow. The proposed system is composed of several high frequency converters connected in parallel, only a few of which are active at a given time to regulate the output voltage. The number of active converters is determined through a sigma-delta modulation process. The specific converter enable signals are generated by a balancing algorithm that ensures approximately equal effective duty ratio and switching frequency for all phases. An output voltage regulator, here implemented as a PI loop, completes the system. The method has been simulated for an eight-phase closed-loop system. Experimental results are shown for a four-phase open-loop system with an external command that corresponds to the effective duty ratio of the power converters.
J. W. Kimball et al., "Sigma-Delta Modulation of Multi-Phase High Frequency Converters," Proceedings of the 25th Annual IEEE Applied Power Electronics Conference and Exposition (2010, Palm Springs, CA), pp. 2202-2206, Institute of Electrical and Electronics Engineers (IEEE), Feb 2010.
The definitive version is available at http://dx.doi.org/10.1109/APEC.2010.5433542
25th Annual IEEE Applied Power Electronics Conference and Exposition (2010: Feb. 21-25, Palm Springs, CA)
Electrical and Computer Engineering
National Science Foundation (U.S.)
Keywords and Phrases
Active Converters; Balancing Algorithms; Control Architecture; Digital Modulation Techniques; Duty Ratios; Four-Phase; High Frequency Converter; High Frequency Resonant Converter; Multiphase Converters; Open Loop Systems; Output Voltages; Power Conversion; Power Flows; Sigma Delta Modulation; Electric Potential; Electric Power Supplies To Apparatus; Frequency Converters; Modulation; Modulators; Power Electronics; Switching Frequency; Voltage Regulators; Delta Sigma Modulation
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Article - Conference proceedings
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