Transient response in a dc-dc converter employing load-current feedforwardcontrol

Load-current feedforward control applied to a voltage-controlled buck-type de-de converter is proposed in order to reduce output voltage deviation. Th e design conditions that optimize the transfer characteristics of the curre nt transformer for load current sensing are identified by introducing the i ntegral of the square of the output voltage deviation as a performance inde x. An effective region of feedforward control limited by the saturation cha racteristics of the PWM is considered quantitatively. The usefulness of the proposed method and the stability problem when the bulk capacitor is added to the load are examined. (C) 2001 Scripta Technica