Voltage-injection control for switched-mode power-supply applications

As clectronic systems become more complex, their powcr supplies requirc higher dynamic performance which is becoming increasingly difficult to meet. In many such applications the load is controlled by a supervisoiy control unit, so that a forthcoming load change can be anticipated. The paper proposes a new control method to enhance the dynamic response of powcr supplies that have a predictable load-switching pattern. By injecting a small voltage into the control loop in advance of the load application, it is shown that thc dynamic response is greatly improved. Both experimental and simulated results arc prescnted and demonslratc the robnstncss of the technique.