Design of DC-DC buck-boost non-inverting converter using PIC microcontroller

Abstract

Switching MOSFET of DC-DC converters were widely used in different types of portable and non-portable electronic devices. The main aim of this research is the input voltage, which comes from a varaible sources. It is required to control model of Buck- Boost non-inverting converter controller by a duty cycle of PWM signal. The objective of the research is to design, simulate and analyze circuit converter to regulate the output voltage by using PIC Microcontroller (16F877A). In the circuit design, the polarity of the output voltage should be not changed. Moreover, the circuit is required to act automatically from one mode to the other mode of Buck-Boost converter. Conventionally, two converters combined together were utilized, a Buck and Boost family of converters. The circuit were perform the dual operations of step-down and stepup modes, which relies on input conditions. The simulation software and the implementation hardware were completed. Proteus Software has been adopted as a simulation tool. The PIC Microcontroller was used in this circuit to generate PWM. The circuit was achieved the output voltage at 12VDC even the input voltage a variable with a range of input voltages was between (6-18) VDC. This circuit was selected in this dissertation project because it has the best specifications such as single inductor and capacitor for both of converters, less number of electrical components, lower stresses, which leads to reduce the total losses, cost and increase the efficiency of the circuit. Moreover, it was achieved supply output voltage with positive polarity. From the collected data, the average efficiency of the proposed converter was reached at 82%. A new alternative for improving the performance of Buck-Boost non-inverting converter on simulation for high power application was proposed with respect to conventional DC-DC converter, current was divided by parallel modality in Multi-Modular converters. Therefore, the high current stress on the semiconductor switches were overcame. It was an optimal solution for high load current requirements in a DC converter.