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

As electronic systems become more complex, their power supplies require higher dynamic performance which is becoming increasingly difficult to meet. In many such applications the load is controlled by a supervisory control unit, so that a forthcoming load change can be anticipated. The paper proposes a new control method to enhance the dynamic response of power 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 the dynamic response is greatly improved. Both experimental and simulated results are presented and demonstrate the robustness of the technique