Figure 4. Input and Output Current for FOSEPIC Converter
Figure 4 presents the input and output currents for the FOSEPIC converter, with panel (a) depicting the currents during boost mode operation and panel (b) showing the currents during buck mode operation. It is evident that there are small, undesired ripples in the output current, likely resulting from noise disturbances within the system. Despite these ripples, the output voltage is consistently regulated at 48V in both operating modes. To maintain the load power amidst variations in input voltage, adjustments to the input current are necessary.
Performance Under Load Variations
The proposed control strategy’s performance was further evaluated under load variations ranging from 50% to 70%. Figure 5 illustrates the dynamic responses of the output voltage in response to abrupt changes in load resistance, with a reference voltage (𝑉𝑟𝑒𝑓 ) set at 48V. The load was switched from 50Ω to 33.33Ω and then back from 33.33Ω to 50Ω. Figures 6 and 7 display the dynamic responses during these load changes while the converter operates in both boost and buck modes, respectively.Notably, the output voltage remains largely unaffected by these load variations, demonstrating the controller’s capability to regulate output voltage effectively. Although small overshoots and undershoots occur during the transient periods, the output voltage stabilizes quickly, confirming the robustness of the proposed control strategy under varying load conditions.