Digital Control algorithm for Two-Stage DC-DC Converters

A systematic digital control method is proposed for the two-stage dc-dc converter, and the design procedure is demonstrated. As the high number of reactive components, the dynamic response of the topology is very complex. The analysis of the steady-state is to verify the work progress of the two-stage converter. And small signal model is got to analyze the transient response of the topology. Then a digital controller which is a lag compensator is designed to compensate the system. The crossover frequency becomes higher than the uncompensated converter, and the second resonant frequency is improved, that the system is adjust to be stable with its setting time and overshoot had be decreased. Experimental results are presented to illustrate the design procedure and the goodness features in steady state and transient response of the digital controller.