CONTROL OF DC-DC CONVERTERS WITH LINEAR OPTIMAL FEEDBACK AND NONLINEAR FEEDFORWARD

This paper describes a new control design procedure for PWM dc-dc conv erters. The control action has two components: a linear feedback, desi gned via LQ approach, and a nonlinear feedforward. The proposed contro l scheme guarantees excellent regulation of the output voltage, even i n the presence of large variations of the input reference signal, as p ointed out by numerous simulations carried out on different converter topologies. Good performances are also achievable when a suitably desi gned estimator is inserted into the control loop to reconstruct intern al variables and input voltage disturbances from output voltage measur ements.