*5.2. Results*

To check the robustness of the proposed controller, using the programmable DC electronic load, the load resistance was abruptly changed from 5 Ω to 3 Ω and then reverted back from 3 Ω to 5 Ω. During these fluctuations, the controller was used to track the constant current of 5 A and the constant power of 120 Watts.

Figures 19 and 20 show the tracking of the constant current and power, respectively. It can seen that during the fluctuations, the controller quickly recovered and tracked the required reference efficiently. Under the constant power tracking of 120 Watts, Figure 21 shows the inverter output current and voltage. According to Figure 21, the inverter output power was approximately 136 Watts, i.e., the power was transferred from the inverter to the DC Electronic load with an overall efficiency of about 88% and coupling coil efficiency of 95%. The decrease in the overall efficiency was due to losses incurred in the rectifier and buck converter. It can be seen that both the simulation and experimental data exhibited similar behavior, which validated the effectiveness of the controller in real life.

**Figure 19.** Tracking of constant current.

(**a**) Load changed from 5 Ω to 3 Ω (**b**) Load changed from 3 Ω to 5 Ω

(**a**) Load changed from 5 Ω to 3 Ω (**b**) Load changed from 3 Ω to 5 Ω

**Figure 20.** Tracking of constant power.

**Figure 21.** Inverter output voltage and current.
