Abstract
This paper develops a novel control methodology for voltage regulation and implementation of a buck DC‐DC converter using a digital signal processor (DSP). Such a converter is modeled as a linear averaged state‐space system model with an adjustable load. An adaptive backstepping voltage regulator is presented based on the measurements of an output voltage and a capacitor current. An approximate averaged circuit model is derived in order to show that the fast and stable mode of the capacitor current can be ignored and the buck DC‐DC converter can be well approximated by the averaged circuit model. With the approximate averaged model, an adaptive backstepping control with integral action is proposed to regulate a stand‐alone buck DC‐DC converter. This proposed control method has been verified by computer simulation and implemented utilizing a stand‐alone digital signal processor (DSP) TMS320C542 from Texas Instruments. Experimental results show that the proposed control method is capable of giving satisfactory voltage regulation performance under a wide range of input voltage variations and load changes.
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