Feedback and feedforward control of buck converter with parasitics

In this paper, the state-space averaging technique is used to obtain the model of complete buck converter system with parasitic resistances in continuous conduction mode. A lag-lead compensator is designed as a controller to improve bandwidth and steady-state accuracy. Two control methods are described, one with the feedback control only to regulate the output voltage and another method includes a feedforward gain to achieve a good line regulation and results are compared. It is shown that with feedforward gain, the overshoot is reduced and there is no transient due to the input voltage disturbance. The results of buck converter system are verified through simulation.