PASSIVITY-BASED CONTROL FOR LARGE-SIGNAL STABILITY OF HIGH-ORDER SWITCHING CONVERTERS

This article presents a new passivity-based control law that stabilizes the output voltage of a high-order DC-DC converter. Such nonlinear control law assures robust large-signal stability, provides zero steady-state error despite uncertainty in converter parameters and has enough degree of freedom to satisfy the usual transient specifications of DC-DC converters. This new integral control is derived in three steps. First, a static law is obtained. Second, a positive semidefinite storage function is synthesized to guarantee zero steady-state error of the output voltage. Finally, the storage functions of the first two steps are combined to derive the new control law for high-order DC-DC converters.