Switching Power Supply Power Factor Correction Technology

This thesis describes the main characters and development of power factor correction (PFC) technology. Its investigative necessity and importance are clarified. The basic theory for all sorts of power factor correction is analyzed, and the topology and control circuit are studied. The principle and application of zero current switching boost PFC circuit are given. By introducing the development of AC/DC module with PFC the key techniques of the module are stressed on the engineering design. Some problems are resolved such as the module is so small that spread the hot difficulty. The thesis also analyzes the average current type of PFC, and gives a design of the former PFC circuit of 1100W switching-power. The key practical techniques of the design are discussed. The experiments have been completed and satisfied results are obtained.In the thesis the hot problems and development of PFC technology are analyzed farther. It establishes good foundations for future research.