Disturbance accommodation control of a buck converter using a fixed-point digital signal processor

A Buck Converter is a dc-dc switched mode power converter which converts the input voltage of a higher level into an output voltage of a lower level. Load changes at the output affect the proper working of the Buck Converter. Modern Feedback Control Systems are not able to nullify the effects of the load changes completely because in many cases the load changes occur persistently.;The usage of a floating point processor increases the overall cost of the closed-loop feedback system. The TMS320F2812 Fixed-Point DSP was used in this thesis to implement the Disturbance Accommodation Control in order to reduce the overall cost of the system without any loss of precision. Assembly language programming was used in order to reduce the memory footprint and the number of clock cycles taken to execute the control algorithm.;The IEEE-754 floating point operations were coded into assembly to prevent any loss of precision during the execution of mathematical operation in the control algorithm.;The thesis proves that it is possible to implement the Disturbance Accommodation Control Algorithm on a low power, low cost Fixed-point processor with reasonable accuracy and speed without the loss of precision.;Previous work done by Gentry (4) has shown that it is possible to remove the effect of persistently occurring load changes by using the Theory of Disturbance Accommodation Control. The Disturbance Accommodation Controller was successfully implemented on a TMS320C30 Floating Point DSP in this previous work.