Feedback Control System Design for High Frequency Converter

A new control scheme for a switch-mode power converter is proposed. A dynamic
programming approach is applied to a buck converter switching regulator powering
the load with abruptly varying load voltage and with abruptly powering changing
load current. This approach can be applied to other switch-mode topologies. The
voltage mode control is applied as it varies the duty cycle and essentially adjusts the
input voltage drive to the buck LC components which directly affects output voltage.
A closed-loop control system automatically maintains a precise output voltage
regardless of varying input and load conditions. In simulation, the performance
efficiency is slightly dropped by 4% but this feedback control system resulted in
good regulation that holds a constant output under changing load condition. The gain
of the feedback is limited to avoid instability. A maximum range of duty ratio gives
advantages to widen the operation of DC-DC converter.