High frequency dual-boost digital PFC converter based on steady second-harmonic compensation and anti-windup control

A steady-state second-harmonic compensation (SSC) method was developed to solve the single power factor correction (PFC) contradiction between steady-state and dynamic performance. The result greatly increases the voltage-loop bandwidth which improves the output voltage stability and increases the input power factor. The anti-windup PI (AW-PI) regulator was also redesigned to improve digital signal processor (DSP) noise immunity which increases the switching frequency and power density. The design improves the dynamic performance of the output voltage and achieves a switching frequency of 200 kHz. In addition, dual-boost PFC topology and double-mode control with variable parameters are used for higher efficiency, with the double-mode control achieving stable output-voltage at light loads. Simulations and experiments show that the digital controller provides very effective control of the voltage output.