Abstract
With the growing computational requirement in powerful digital processors in modern smartphone and automotive applications, multiphase buck converters remain an attractive power management solution to achieve higher efficiency over a wide load current range with better thermal distribution and faster load as well as DVS transient performance with the reduced output capacitor. Also, a high switching frequency is desirable for a smaller form factor, which makes it difficult to sense fast-changing phase currents. Fixed frequency voltage mode control (VMC) remains a cost-effective solution in terms of phase shifting and phase shading; however, the challenges remain in achieving fast transient performance and accurate phase current balancing. This paper considers a VMC multiphase buck converter and proposes a novel current balancing method and controller tuning algorithm to achieve fast transient with accurate phase current balancing for master-master VMC configuration. Small-signal-based PID and type-III compensator design methods are considered for the controller design. Finally, a large-signal based PID controller is computed, which can significantly improve the transient performance and is demonstrated using simulation results. A four-phase buck converter prototype is fabricated, and a few experimental results are presented.
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