The Research Of Design And Simulation On APFC Circuit Of Switch Power Supply

With the fast developing of electronic science and technology, the devices of switch power supply have been used in the field of manufacture and living gradually extensive. However, because of the low power factor of these devices,it has injected a lot of harmonic in electrical power system, which cause the harmonic pollution problems are increasing serious. The active power factor correction technology is an important method which can increase the power factor and reduce the rectification circuit harmonic current. This technology can make the input current to be sinusoidal wave with the same phase with the input voltage, and make the rectification circuit doesn't produce harmonic current basically. The APFC technology become an hot research subject.In this paper, we firstly analyzed and compared the basic principle,basic convert circuit and the control method of active power factor correction. In this foundation, identified the Average Current Mode control Boost APFC circuit as the research target of this paper.Then, we analyzed the structure and work principle of the Average Current Mode control Boost APFC circuit in detail, and set up the small signal model based on the Average Current Mode control Boost APFC circuit. Finally, designed and finished the 500W Boost APFC circuit based on UC3854, and built the simulation modle, analyzed the simulation results by MATLAB.This thesis is a production of circuit design and simulation practice. Based on the circuit principle analysis and circuit design, the author simulated main circuit and control circuit of APFC circuit by the simulation software ---MATLAB. The simulation results indicate that the circuit has achieved the design specification and the expected electrical characteristics, also have verified the correctness of theoretical Analysis and circuit design in this paper.