A Buck Converter for DVS Compatible Processors in Mobile Computing Applications Using Fuzzy Logic Implemented in a RISC based Microcontroller

The design of voltage regulators for mobile computing applications is complicated by several factors that lead to making tradeoffs between efficiency, voltage ripple and dynamic response. Careful choices must be made in selecting the passive and active components order to accommodate for the performance figures required to achieve compatibility for DVS ready processors. A suitable control scheme must be selected that can suffice the stability and dynamic response required. This paper describes the design of Buck converter that has a fuzzy controller implemented using Atmel Atmega189 RISC Based microcontroller with a choice of hardware components that will ensure better efficiency while delivering good stability and dynamic response. System simulation was carried out using MATLAB/SIMULINK. Simulation results showed that the fuzzy controller has the capability of providing response characteristics that makes it comparable with PID controllers and more suitable for implementation using microcontrollers. Keywords— Fuzzy Logic Control, Buck Converter, Microcontrollers, PID, RISC, DVS.