## 6 Simulation and Experimental Results  
In this section, simulation results, obtained in Matlab/Simulink, and the experimental results, extracted from a lab-scaled prototype, are provided to verify the performance of the redundant-switch based converter. The characteristics of the employed elements are listed in Table 3. For brevity only the commercial name of the components are listed in this table; however, the detail information can be found in the datasheets. To substantiate better reliability, it is better to examine the dynamic behavior of the converter under a condition that one interleaved phase is out of operation. When one of the phases is out of operation, the faulty phase should be bypassed so that the other phases can continue to function and guarantee the normal operation of the converter. In order to test the performance of the converter under faulty conditions, two faults are exerted to two of the phases in different instances. The first and second faults are considered to happen at 35 ms and 60 ms, respectively. Under the first faulty condition, the faulty phase should be bypassed and the converter should proceed to operate with the remaining phases. In the healthy mode of a three-phase converter, the switches are symmetrically triggered by 120 degree phase-shift to guarantee a smooth current at the input side. When a fault occurs in one of the phases, the converter is reconfigured from three-phase to two-phase to fend off the fault effects. Additionally, to avoid asymmetric switching, the switches should be triggered by 180 degree phase-shift instead of 120 degree phase-shift. However, this will cost a higher input current ripple and output voltage. To prove the ability of the considered converter in the mentioned operation modes, simulation results of the output voltage and input current are shown in Figure 10a,b respectively. As predicted, due to the reduction of the phase, the ripple of the input current and output voltage increase as the faulty phases are bypassed to react against the faults. The lab-scaled prototype, which is shown in Figure 11, is a 300 W three-phase interleaved dc-dc converter that is equipped with redundant-switch (the parallel-switch and standby-switch) configurations. The experimental and simulation results of the considered redundant configuration are shown in Figure 12. As seen in Figure 12a,b, the parallel-switches carry half the phase current, and thus it includes lower conduction power losses. The voltage across the switches is equal to the output voltage. Since the switching power loss depends on the voltage across the switches and all the switches tolerate the same voltage, the switching power loss of the switches are the same. Figure 12c,d shows the experimental and simulation results of the voltage of the standby-switch along with the current passing through the active switch in the standby-switch configuration, respectively. Furthermore, the input current and output voltage of the converter are shown in Figure 12e,f, (Figure 12e shows the experimental results and Figure 12f shows the simulation results). Since this work is not aimed at improving the performance of the studied converter, the components and measuring devices are chosen arbitrarily. That is why the distortions and noises appear in experimental results. However, it is possible to extract more qualitative results by using some suitable components and precise measuring devices. Despite the noise and spikes in experimental results, the overall waveforms of experimental and simulation results are in full agreement with each other. \begin{table}
\begin{tabular}{c c} \hline \hline
**Parameters** & **Values** \\ \hline
**Inductors** & 300 \(\mu\)H \\
**Output Capacitor** & 100 \(\mu\)F \\
**Switching Frequency** & 40 kHz \\
**Input Voltage** & 40 V \\ \hline
**Output Voltage** & 210 V \\
**Output Power** & 275 W \\
**MOSFET Type** & IRFP460, Ron = 0.27 \\  & ohmCoss = 870 pF \\
**Diode Type** & SXAHN/HR14, Ron = 0.2 ohm \\ \hline \hline \end{tabular}
\end{table}