## 4 Verification with Practical Results  
The real results are always considered to be more authenticated in power conversion based on the switching behavior of solid-state devices. The results contain the practical constraints that are normally ignored in numerical calculation and simulation modeling. The practical test circuit reported in [22] is used to validate the simulated and numerically obtained results as this topology is simple to realize. For this purpose, the peak value of the input voltage is taken at approximately 65 V with a supply frequency of 50 Hz. In this regard, Figure 15a shows the 25 Hz frequency output voltage with respect to its spectral plot. In this output, the amplitudes of the first and fourth half cycles are 50% of the amplitudes of the second and third half cycles. The FFT spectrum of output voltage indicates that the 75 Hz frequency harmonic has comparable amplitude (60%) with respect to the required 25 Hz component. This sort of output has a high harmonic factor of approximately 72%. The variation in the amplitude of the half cycles of the output voltage also varies the amplitude of the input current half cycles. It is clear for Figure 15b that the first and fourth half cycles of the input current have 50% more amplitude than that of its second and third half cycles. The spectrum of Figure 15b of input current indicates the generation of 25 Hz and 75 Hz harmonics responsible for a high value of its harmonic factor as their amplitudes are nearly 30% and 18% of the fundamental component (50 Hz), respectively. These input current harmonics increase the harmonic factor to nearly 34%. This investigation concludes that there is no improvement in the power quality for the output frequency which is one-half of the input frequency. Figure 14: For various output frequencies without output voltage regulation capabilities: (**a**) input current waveform; (**b**) its FFT spectrum. Figure 15: Practically recorded results for one-half output frequency with pulse voltage regulation capabilities: (**a**) output voltage and its FFT spectrum; (**b**) input current and its FFT spectrum. Some improvement in the power quality of the output voltage for the frequency where it is one-third of the input frequency is observed. To support this, the waveform of such output along with FFT is depicted in Figure 15(a). In this waveform, there are six pulses in the output, and the amplitude of the first, third, fourth, and sixth are 50% more than that of pulse number second and fifth. This regulation in output pulse regulation results in eliminating the prominent voltage harmonic component existing at 50 Hz frequency. Its magnitude is one-third of the output voltage required component (50/3 Hz). This can be seen in the spectrum of the output voltage as illustrated in the FFT information of Figure 15(a). The voltage variation in the output pulses is also reflected in the input current in the form of unequal magnitude of the half cycles as shown in Figure 15(b). Here, the peak amplitude of the second and fifth half cycles of the input current is double that of the remaining half cycles. It can be seen from the FFT spectrum of the input current that with the fundamental component (50 Hz), there are some comparable low-frequency harmonics (25 and 75 Hz) that lead to a high value of the harmonic factor. The power quality improvement of the input current for the pulse non-adjustment approach is described in Figure 17. FFT spectrum of the output voltage for one-half and the one-third output frequency is illustrated in Figure 16(a),b. It is clearly shown that there is improvement in the harmonic profile of the output voltage for one-half frequency as the 50 Hz harmonic component has been successfully removed. The magnitude of the low-frequency harmonics for the one-third output frequency voltage slightly increases, raising its harmonics factor from 55% to 68%. However, the power quality indexes of the input current for the frequencies mentioned above are approaching their ideal value.