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Low-cost digital control for SMPS integration

Abstract : Digital control is becoming a new trend in Switching Mode Power Supply (SMPS) development. This paper described a prototype implementation of a digital control solution prior to monolithic integration. An original algorithm, called RST, is used to obtain a better rejection of load variations and PWM noises than PID algorithms while keeping a good robustness. Sensitivity functions have been introduced that help tuning the algorithm coefficients. An FPGA implementation has been performed for the control of a 1MHz step-down voltage regulator. One challenge in design is to meet the output voltage accuracy, avoid the limit cycle phenomenon and reduce the high-frequency clock requirement. The choice and impact of fixed-point representation for the computation has been discussed. A 9-bit resolution DPWM is obtained using DLL function modules in FPGA and a half cycle counter. Experimental results proved the performance of the proposed digitally control SMPS
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https://hal.archives-ouvertes.fr/hal-00373033
Contributor : Publications Ampère <>
Submitted on : Friday, April 3, 2009 - 10:48:05 AM
Last modification on : Tuesday, April 7, 2020 - 1:59:18 AM

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  • HAL Id : hal-00373033, version 1

Citation

Xuefang Lin-Shi, Bruno Allard, Shuibao Guo, Yanxia Gao. Low-cost digital control for SMPS integration. 5th CIPS, Mar 2008, Nuremberg, Germany. pp.05.3. ⟨hal-00373033⟩

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