Power factor correction(PFC)technology can improve the high-order harmonic pollution caused by nonlinear power electronic equipment in the grid current,so improves the utilization of e-lectric energy in the circuit system.PFC converter based on Boost topology and working in continu-ous conduction mode(CCM)is widely used in various switching power supplies.This paper uses the controller UCC28180 to design the unidirectional active PFC circuit.The circuit schematic is firstly designed,then the parameters are calculated according to the design requirements,and then the control system modeling,the loop design and the stability analysis are performed according to the control theory.Finally,the feasibility of the circuit design is verified by experiments.
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