Conversor Buck CC-CC aplicado à termocicladores

Abstract

The main goal of this undergraduate thesis is to develop a power converter system in order to build an automatic thermocycler, used for applying the PCR technique in DNA exams. Initially, a study about the PCR technique is presented, as well as the thermocycler operation. Its functions, features, components, and, lastly, the criteria and the parameters of choice of the electronic system are developed. All the circuits of the purposed converter are presented, together with the respective calculus and/or other parameter of components. The system is comprised of a full-wave rectifier circuit with capacitive filter, a buck converter and a current reverse circuit (H-bridge). After the design of the circuits, they are assembled and a prototype is constructed, with a thermal system similar to the commercial thermal cyclers. The temperature data is collected during its operation to be compared to the performance of commercial units.