Achieving high input power factor for DCM boost PFC converters by controlling variable duty cycle

摘要

Power factor correction converters have been widely used in ac-dc power conversions to achieve high power factor (PF) and low harmonic distortion. A discontinuous-current-mode (DCM) boost power factor correction (PFC) converter features zero-current turn-on for the switch, no reverse recovery in diode, and constant frequency operation. But the input power factor (PF) is relatively low when the duty cycle is constant. The proposed work achieves high input power factor by controlling the variable duty cycle for DCM boost power factor correction converters. A new method has been introduced for the accurate measurement of power factor. The proposed technique achieves a lower output voltage ripple and higher efficiency compared to constant duty cycle control.