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Modeling of Digitally-Controlled Voltage-Mode DC-DC Converters

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5 Author(s)
Chih-Hung Chen ; RichTek Technol. Corp., Hsinchu ; Wei-Hsu Chang ; Dan Chen ; Liang-Pin Tai
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In this paper, an S-domain control model for a digitally- controlled dc-dc buck converter is presented. The model gives detailed description about the gain and the phase lag of each block in the control loop in digital implementation. There is a significant phase lag in the digital implementation compared to that of a analog counterpart. This model has been experimentally verified in a field- programmable-gate-array (FPGA) based DC-DC buck converter in the laboratory. The model is easily understandable and practically useful for a majority of power electronic engineers familiar with DC converters using traditional analog control to design a digital compensator. This model can be easily extended to other converter topologies.

Published in:

Industrial Electronics Society, 2007. IECON 2007. 33rd Annual Conference of the IEEE

Date of Conference:

5-8 Nov. 2007