Closed Loop Model of Transformer less Buck–Boost Converter with Positive Output Voltage

Abstract

Compared with the traditional buck–boost converter, the proposed buck–boost converter’s voltage gain is squared times of the former’s and its output voltage polarity is positive. These Advantages enable it to work in a wider range of positive output. The two power switches of the proposed buck– boost converter operate synchronously. In the continuous conduction mode (CCM), two inductors are magnetized and two capacitors are discharged during the switch-on period, while two inductors are demagnetized and two capacitors are charged during the switch-off period

                Further  we implement  feedback control using PI.PI controller will eliminate forced oscillations and steady state error resulting in operation of on-off controller and P controller respectively. However, introducing integral mode has a negative effect on speed of the response and overall stability of the system.