Sliding mode control of a full-bridge unity power factor rectifier

This work studies the dynamics of a single-phase unity power factor full-bridge boost converter circuit and develops a nonlinear controller for the regulation of its output DC voltage, which keeps the input power factor close to unity. The controller has a two loop structure: the inner is a fast dynamic response loop with a sliding controller shaping the inductor input current of the converter, and the outer is a linear controlled slow dynamic response loop that regulates the output DC voltage. The squared value of the DC voltage is passed through a LTI notch filter to eliminate its ripple before using it in the outer control loop. This filter, consequently, allows one to expand the bandwidth of the loop and improves its dynamic response.