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Digital Sliding-Mode Controller For High-Frequency DC/DC SMPS

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5 Author(s)
Shuibao Guo ; Université de Lyon, AMPERE, INSA LYON, CNRS UMR5005, F69621, VILLEURBANNE, France ; Xuefang Lin-Shi ; Bruno Allard ; Yanxia Gao
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Digital control technique is becoming an attractive alternative for high-frequency switching mode power supply (SMPS). This paper introduces a fully synthesizable digital sliding-mode (SM) controller for high-frequency dc/dc SMPS. The proposed SM controller is associated with a digital pulsewidth modulation (DPWM) block to operate at constant and high switching frequency compared to already published approaches. The digital SM controller is experimentally validated by means of field-programmable gate array in a 4-MHz step-down converter with 10-bit analog-to-digital conversion (ADC) and 11-bit DPWM. Measured dynamic performances are superior to conventional digital controllers for dc/dc SMPS.

Published in:

IEEE Transactions on Power Electronics  (Volume:25 ,  Issue: 5 )