The series-input parallel-output dc-dc converter combination provides inherent sharing among the converters. With conventional controls, however, this sharing is unstable. Recent literature work proposes complicated feedback loops to correct the problem, at the cost of dynamic performance. This paper shows that a simple sensorless current mode control stabilizes sharing with fast dynamics suitable for advanced digital loads. With this control in place, a "super-matched" current sharing control emerges. Sharing occurs through transients, limited only by the energy limits of the converters. The control approach has considerable promise for high-performance voltage regulator modules. For even faster response, clamping techniques are proposed.
P. T. Krein and J. W. Kimball, "Series-Parallel Approaches and Clamp Methods for Extreme Dynamic Response with Advanced Digital Loads," Proceedings of the IEEE Workshop on Computers in Power Electronics, 2004, Institute of Electrical and Electronics Engineers (IEEE), Aug 2004.
The definitive version is available at http://dx.doi.org/10.1109/CIPE.2004.1428128
IEEE Workshop on Computers in Power Electronics, 2004
Electrical and Computer Engineering
Keywords and Phrases
DC-DC Power Convertors; Dynamic Response; Electric Current Control; Feedback
Article - Conference proceedings
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