For this example, improve the bandwidth and phase margin of the system to achieve
better performance by characterizing the system using frequency response estimation
and tuning the PID gains. When tuning the PID controller note the following
characteristics of the buck converter system:
- No system process or sensor noise
- Controller input is the PWM signal
- PWM signal is limited (saturated) to be between 0 and 1
- Nominal output of controller at steady-state is 0.5
For buck converter systems, it is desired to have a system with a low rise time and low
overshoot. For this example, tune the controller to achieve a desired rise time of 250e-6
seconds and an overshoot of less than 10%.
Design PID Controller Using Plant Frequency Response Near Bandwidth