# Interleaved Boost Converter with ZVT-ZCT for the Main Switches and ZCS for the Auxiliary Switch
## 6 Experimental Results  
Figures 17-27 are measured at the rated load. Figure 17 shows the gate driving signals for \(S_{1}\), \(S_{2}\) and \(S_{a}\), called \(v_{g1}\), \(v_{g2}\) and \(v_{ga}\). In addition, \(v_{g1}\) and \(v_{g2}\) are almost the same except that the difference in phase between them is 180 degrees, and \(S_{a}\) is turned on before \(S_{1}\) and \(S_{2}\) are turned on or off. Figure 18 shows the gate driving signal for \(S_{1}\), called \(v_{g1}\), the voltage across \(S_{1}\), called \(v_{S1}\), and the current flowing through \(S_{1}\), called \(i_{S1}\). Figure 19 is the zoom-in of Figure 18 as \(S_{1}\) is turned on, whereas Figure 20 is the zoom-in of Figure 18 as \(S_{1}\) is turned off. Figure 21 shows the gate driving signal for \(S_{2}\), called \(v_{g2}\), the voltage across \(S_{2}\), called \(v_{S2}\), and the current flowing through \(S_{2}\), called \(i_{S2}\). Figure 22 is the zoom-in of Figure 21 as \(S_{2}\) is turned on, whereas Figure 23 is the zoom-in of Figure 21 as \(S_{2}\) is turned off. Figure 24 displays the gate driving signal for \(S_{a}\), called \(v_{ga}\), the voltage across \(S_{a}\), called \(v_{Sa}\), and the current flowing through \(S_{a}\), called \(i_{Sa}\). Figure 25 is the zoom-in of Figure 24. In addition, Figure 26 shows the voltage across the resonant capacitor \(C_{r1}\), called \(v_{Cr1}\), the voltage across \(C_{r2}\), called \(v_{Cr2}\). Figure 27 displays the voltage across \(S_{1}\), called \(v_{S1}\), the current in \(L_{1}\), called \(i_{L1}\), and the current in \(L_{2}\), called \(i_{L2}\). From Figures 19 and 20, it can be seen that the main switch \(S_{1}\) has ZVT turn-on and ZCT turn-off, whereas from Figures 22 and 23, it can be seen that the main switch \(S_{2}\) has ZVT turn-on and ZCT turn-off. From Figure 25, since the auxiliary switch \(S_{a}\) is connected in series with the resonant inductor \(L_{r}\), thereby making \(i_{Sa}\) increase slowly and hence causing \(S_{a}\) to be turned on with ZCS. From Figure 26, via \(C_{r1}\), \(C_{r2}\), and \(L_{r}\) in the resonant loop along with \(C_{S1}\) and \(C_{S2}\) of the main switches \(S_{1}\) and \(S_{2}\), the soft switching of the main switches for individual phases can be realized. It is noted that due to the diode clamp, \(C_{r1}\) and \(C_{r2}\) can be reversely charged to \(-V_{o}\). From Figure 27, it can be seen that the DC values of \(i_{L1}\) and \(i_{L2}\) are almost the same, and \(i_{L2}\) is shifted from \(i_{L1}\) by 180 degrees. Figure 19: Zoom-in of Figure 17 as \(S_{1}\) is turned on: (1) \(v_{g1}\); (2) \(v_{S1}\); (3) \(i_{S1}\). Figure 20: Zoom-in of Figure 17 as \(S_{1}\) is turned off: (1) \(v_{g1}\); (2) \(v_{S1}\); (3) \(i_{S1}\). Figure 23: Zoom-in of Figure 20 as \(S_{2}\) is turned off: (1) \(v_{32}\); (2) \(v_{52}\); (3) \(i_{52}\). Figure 24: Waveforms relevant to \(S_{a}\): (1) \(v_{ga}\); (2) \(v_{5a^{\prime}}\); (3) \(i_{5a}\). Figure 25: Zoom-in of Figure 23 as \(S_{a}\) is turned on: (1) \(v_{ga}\); (2) \(v_{5a}\); (3) \(i_{5a}\). On the other hand, Figure 28 shows how to measure the efficiency. First of all, as displayed in Figure 28, the input current \(I_{in}\) is attained by measuring the voltage across the current-sensing resistor according to the digital meter named Fluke 8050 A. Next, the input voltage \(V_{in}\) is obtained also by the digital meter. Therefore, the input power is the product of \(V_{in}\) and \(I_{in}\). Concerning the output power, the output current \(I_{o}\) is read from the electronic load and the output voltage \(V_{o}\) is attained also by the digital meter. Hence, the output power can be gotten. Eventually, the accompanying efficiency can be attained. Figure 29 displays the curves of efficiency versus load under the input voltage of 24 V. From Figure 29, it can be seen that the converter with the proposed soft switching circuit has higher efficiency than that of the converter without the proposed soft switching circuit.