# Regulated Power Supply with High Power Factor for Hyperspectral Imaging Applications
## 4 Experimental Results  
### Performance of the Proposed Power Supply  
Using the PSIM 10.0 simulation software (Powersys., Les Jardins de l'Entreprise, BP, France), a schematic of the proposed SMPS with power factor correction was implemented under conditions of maximum power output (300 W). Upon completion of the simulation, the voltage waveform at the input (ideal power grid) and the resulting current waveform were displayed. This visualization also provided additional results, including the PF value and THD. According to the simulations, as shown in Figure 11, the PF is 0.96, and the THD is 2.65%. A PF meter (KWS-AC301 Power Meter) was used at the input stage to measure electrical parameters. This meter consisted of a current-sensing toroidal transformer placed around one of the two power supply cables connected to the electrical grid. In parallel, a voltage meter was connected to both power supply cables. A spectrum analyzer (Fluke 1770 Series; Fluke Iberica, Alcoholas, Madrid, Spain) was employed to assess harmonic distortion and specifically configured to monitor the primary harmonics generated by the system and injected into the electrical grid. This analyzer is capable of calculating the THD and displaying the results on its screen. Finally, for measuring output power, two TRUE RMS digital multimeters (UNI-T UT890C) were used--one to measure the output voltage and the other to measure the output current. The employment of a wattmeter combined with a current shunt would facilitate the acquisition of more precise measurements because it minimizes the introduction of nonlinearities. However, while measurements taken with this type of instrumentation can be influenced by some nonlinearities, they still maintain adequate quality for conducting electrical comparisons between different sources. Figure 10: Information extracted from the HS cube for the different illumination modes. (**a**) Reflectance spectral profile. (**b**) Reflectance spatial profile. (**c**) Reflectance temporal profile. (**d**) Transmittance spectral profile. (**e**) Transmittance spatial profile. (**f**) Transmittance temporal profile. The results from these electrical measurements for the three power supplies (the proposed one and two commercial models) are shown in Table 2. Regarding the experimental results, it was observed that the simulation accurately validated the measured values at maximum power. However, at minimum power, there was a noticeable discrepancy between the simulated and actual measured results. This may be due to the simulation model not fully incorporating the complete switching element model. The comparison of the three power supplies leads to the conclusion that the proposed switch-mode power supply with PFC outperforms the commercial models across the entire power range. In fact, it delivers twice the power of either of the commercial units. It was also found that the commercial supplies exhibited higher electrical noise in the lamp, whereas the proposed switch-mode power supply showed significantly improved THD, resulting in a better power factor. The system's performance can be summarized as follows:  
* Output ripple voltage is high but does not affect the illumination efficiency of the lamp because the switching frequency of the output converters is about 3000 times higher than the noise generated by the lamp as it heats up;
* The lamp noise does not increase because the sampling frequency and subsequent corrections are very fast. In contrast, with an LPS, the noise increases because the voltage compensation is relatively slow compared to the noise frequency of the lamp;
* Although the final PF is not constant and fluctuates depending on the power delivered at the output (no commercial power supply is constant, and the PF shown on the