A Time-Based Control Scheme for Power Factor Correction Boost Converter

A time-based control scheme for the power factor correction (PFC) boost rectifier is presented. Average-currentmode control in time is achieved using time-based compensators performing a proportional-integral control action. The controller is fully CMOS compatible, which allows for monolithic integration with the power switching elements. The time-based controller also eliminates the need for the pulse-width-modulation (PWM) generator required in the conventional analog and digital controllers. The proposed controller draws a sinusoidal input current in phase with the input mains voltage and delivers a dc output voltage. The control scheme model is verified on a 600W PFC boost converter, achieiving a power factor of 0.99 and a 400 V dc output from a 230 Vrms 50 Hz input voltage.