A high frequency switching power supply with power factor correction using a preregulator AC-DC interleaved boost with soft-commutation

This work presents the operation and design of a high power factor power supply. A good power factor is obtained using, as a preregulator circuit, an AC-DC boost power converter interleaved using a nondissipative snubber and operating at a frequency of 100 kHz per cell. By using interleaved power converters, one can obtain an overall reduction of the boost inductor, together with reduced switching losses. A nondissipative snubber associated with the forward converter providing the soft commutation switching is used as the DC-DC power converter. It also is presented. The output voltage is controlled by PWM with a constant frequency. The complete operating principles, theoretical analysis, relevant equations and simulation results are presented. Experimental results of a prototype rated at 500 watts, with an input AC voltage of 150 Vrms and, an output of 50 Vdc has been implemented in laboratory.