A Novel Closed-Form Analytical Model for Zero-Voltage Switching (ZVS) operation of a Totem Pole PFC with Hysteresis Current Control

Addressing high efficiency and high power density applications, as the Totem Pole Power Factor Corrector (PFC) operating in Zero-Voltage Switching (ZVS) and controlled with an advanced Hysteresis Current Control, an analytical model for run-time calculation of the limit values of the hysteresis band and the dead-times is presented. Exploiting the single-channel equivalent circuit in Laplace domain, the exact solution to obtain the ZVS during the resonant transition is first calculated then, to largely reduce the computational burden for each transition, a approximated solution is adopted using Taylor series expansion and equation linearization. The proposed control scheme considering both accurate and approximated transient models have been simulated in MATLAB/Simulink environment and implemented on the STMicroelectronics microcontroller STM32G474. Finally, the experimental results of a converter prototype are presented validating the proposed solution and its implementation, allowing the real evaluation of the computational time savings.