Optimization of a CCM Steady State Boost Converter Power Supply for a Biomedical Sensor

Applications of the boost converter are becoming more popular in portable biomedical systems because they need to increase the input voltage coming from a small LR 44 battery or other source. This work presents a procedure for optimizing a boost converter power supply for a biomedical sensor. The initial design is obtained by using a first-grade model to calculate the boost converter components, then an optimization procedure is applied based on the Nelder Mead algorithm, which is performed using a Matlab – LTspice driver. Values of the inductor and capacitor, as well as the boost converter's duty cycle and switching frequency are used as optimization variables. Design specifications include the average and ripple input current, the average and ripple output voltage, and the output current and its ripple. Results show a trade-off between the output voltage and the input current of the boost converter topology presented. At the end of the optimization process, the best component values are selected based on the electrical parameters that meet the specifications.