A Novel Multiphase Multi-Interleaving Buck Converters for Future Microprocessors

This paper presents a new converter architecture as a candidate for future microprocessors. Because the segmentation, phase shifting and merging principles are implemented, the converter architecture allows a multi-interleaving operation and provides automatic current sharing. The multiphase buck converters with multi-interleaving technique perform better than interleaving technique because the multi-interleaving technique can improve current ripple cancellation effect, can extend duty cycle, can improve transient response without increasing current ripple in each cell, and can raise the switching frequency with low switching, gate drive and body diode losses. Moreover, the concept of bypass LC filter between input and output is given to achieve nonpulsating input current and `zero'-ripple output current. As a result, based on losses analysis and simulation results, high efficiency, high power density, fast transient response and low-cost 12 V input VRM with output voltage 0.5 to 1 V and output current 100 to 300 A to power future generation of microprocessors can be realized.

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