A Series Power Factor Corrector Without Electrolytic Capacitor Realized By Fluctuating Power Decoupling

In the field of application,the power factor correction(PFC)converter supply device covers almost all power electronic equipment and becomes a popular technology.In order to balance the input and output power of the converter,the electrolytic capacitor is usually connected in parallel to the load side.The short life of electrolytic capacitor is the main reason to restrict the performance of the converter,so eliminating electrolytic capacitor technology is widely used in the field of power electronics.In this paper,the technology of eliminating electrolytic capacitor in recent years is classified and introduced in detail by topological structure and control method.Based on reading a large number of literature,a new series power decoupling PFC topology is proposed,according to the principle of voltage compensation and power decoupling,a new control strategy for voltage compensation open-loop is proposed for this decoupling circuit.The method without the current sampling link does not depend on the voltage disturbance on the load side,improves the stability and reliability of the system,and the switching device can withstand lower voltage,reducing the volume and cost of the converter.In order to improve the circuit input current quality,two closed-loop control systems are proposed for decoupling circuits.The simulation results show that compared with open-loop strategy,the closed-loop control strategies can optimize input current quality,reduce the harmonic pollution,but the cost and complexity is higher than the open-loop control strategy.In the end,the experimental verification of the open-loop and single-closed-loop control strategy of the proposed series decoupling circuit topology and voltage compensation is verified,and the experimental results prove the correctness of the theory.