Voltage-Mode Digital Pulse Skipping Control of a DC–DC Converter With Stable Periodic Behavior and Improved Light-Load Efficiency

PROJECT TITLE :

Voltage-Mode Digital Pulse Skipping Control of a DC–DC Converter With Stable Periodic Behavior and Improved Light-Load Efficiency

ABSTRACT:

A pulse skipping modulation (PSM) technique improves the sunshine load potency during a dc–dc converter by selectively skipping a few clock pulses. But, in existing PSM schemes, the number of charge and/or skipped cycles can't be predefined. Thus, it is difficult to predict the ripple parameters and guarantee a stable periodic behavior. Further, it becomes tough to any minimize power losses underneath lightweight load conditions. This paper proposes a voltage-mode digital pulse skipping modulator which uses a digital pulse-width-modulator (PWM) as a building block, therefore creating it straightforward to work the system in both PWM and PSM modes. Not like in existing PSM schemes, the sequence and also the count of charge and skip cycles will be absolutely prespecified in the proposed theme, with the amount of skip cycles optimally chosen to maximize the potency. Stability analysis is distributed using discrete-time modeling, that provides pointers to ensure a stable periodic operation with predictable ripple parameters. Tiny-signal modeling and style of the proposed PSM scheme are discussed. A prototype buck converter was fabricated and tested. The proposed control scheme is implemented using an FPGA device, and also the experimental results fully support the analytical predictions.

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