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The analysis of electromagnetic processes in power switch of a zero-current switching quasi-resonant pulse converter with parallel resonant circuit is presented in this paper. The analysis performed by stitching equations illustrating change of power switch current and power switch voltage. The obtained results for each switching interval allowed to estimate the overall power dissipation and power losses for all switching intervals.

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Models of pulse converters (PC) with pulse-width modulation (PWM) and zero-current-switch quasi-resonant pulse converter (QRPC-ZCS) with pulse-frequency modulation (PFM), which operate as part of a power factor corrector (PFC), are proposed. Simulation allowed to get the