Research On Single Phase Power Factor Correction With High-gain And Low-ripple

With the development of power electronic devices, harmonic pollution control has attracted more and more attention, and Power Factor Correction technology has become one of the hot technologies in the field of power electronics. Currently, Boost converter is most widely used for PFC as its simple circuit, power switch is easy to drive, better circuit performance, and the little distortion of input current. In this thesis, input inductor continuous mode of quadratic Boost PFC converter has been studied and analyzed as Boost PFC converter in CCM mode has a smaller input inductor current ripple. Compared with conventional Boost PFC converter, quadratic Boost PFC converter has a smaller input inductor current ripple and output voltage ripple, which reduce the size of pre-EMI filter network, thus reducing the volume and weight of the converter and the cost of the equipment.Firstly, this paper briefly describes background and significance of the research, and the research status and development direction of active power factor correction(PFC) circuit. Then this paper analyzes several commonly used main circuits of the power factor correction techniques and describes the control method and the principle of the continuous mode and discontinuous mode, and pointed out that the main contents of the paper.Detailed analyses for different operating modes of the quadratic Boost PFC converter are presented and the corresponding work waveforms are given. Through the analysis of the input inductor current ripple and output voltage ripple of both traditional Boost PFC converters and quadratic Boost PFC converter shows quadratic Boost PFC topology can effectively reduce the input inductor current ripple and output voltage ripple waves. And the analyses of the duty cycle range and voltage stress are presented too.In order to verify the correctness of theoretical analysis, modeling for the continuous current mode operation of the converter is developed in this paper. In addition, detailed description of the design of the peak current controller is presented. And the theoretical analysis was verified by simulation.Finally, the calculation method of the input inductor current ripple of the CCM-DCM operating mode is also presented. The state space equivalent model of this operating mode of the converter is established, and the theoretical analysis was verified by simulation.In brief, this paper proposes a novel topology of quadratic Boost PFC converter. Its operating characteristics and control method are researched. The correctness of theoretical analysis is demonstrated by simulation.