Results above show that the open-loop response of DCDC
boost converter considered in this paper is stable and at
the end of the simulation the voltage reaches the expected
value of 24V much higher than the input value of 12V with
constant duty ratio of 0.5. During start up, there is a high
overshoot in the output voltage and inductor current which
increases as we increase the load resistance. It shows that
the variation in the load resistance significantly effects the
output voltage. The analysis in Table 2 indicates that the
percentage of overshoot can raise up to a maximum of 45%
by simulating with the highest value of the load resistance.
Hence, an unsatisfactory response is contributed by
incresing the value of load resistance due to its effect on
overall damping of the converter system. A controller is
needed due to large maximum overshoot and long settling
time in order to achieve a satisfactory performance of less
than 10% overshoot and faster settling time of less than
0.5ms.