The proposed perturbation on-time technique suppresses total harmonic distortion (THD) and, thus, improves the power factor in the power factor correction (PFC) controller. Besides, the adaptive control of the minimum off time by the proposed inhibit time control can improve efficiency even at low ac input voltage. Therefore, highly integrated PFC converter fabricated in the TSMC 800-V ultrahigh voltage process can achieve low THD of 6%, high PF of 99%, and high efficiency of 95% at the output power of 90 W.
- Inhibit time (IT) control
- nonnegative-voltage zero current detector (NNV-ZCD)
- perturbation on time (POT)
- power factor correction (PFC)
- ultrahigh voltage (UHV)