Novel nonlinear digital controller for a buck converter with dead beat characteristic [articol]

Abstract

The static and dynamic characteristics of buck converters are well known for a long time. An easy approximation results in a first order transfer function in discontinuous conduction mode (DCM). Based on the description in DCM in time domain the controller is designed to compensate a load step using a nonlinear algorithm for the calculation of the duty cycle. The result is a controller with dead beat characteristic. Because in theory the controller needs only one clock cycle for compensation the controller is a member of the one-cycle controllers.