Study On Soft Switching Bridgeless Boost PFC Circuit Based On One Cycle Control

At this stage, the harmonic pollution has become a major source of pollution in the power system. The best way to solve the problem of harmonic pollution of the utility grid and improving the quality of the utility grid is reduces the harmonic pollution and improves the power factor of the circuit by power factor correction technology. The technology of power factor correction,through improved power electronic devices, solve the problem of harmonic pollution completelyin essential, and greatly reduce or eliminate harmonic pollution. Thereby, power factor was increased.This paper studied in CCM the soft switching bridgeless boost PFC main circuit and the method of one-cycle control circuit. Synthesizing the advantage of bridgeless boost PFC circuit and soft switching circuit, as well as one-cycle control method, this paper designed the soft-switching bridgeless boost PFC circuit based on one-cycle control. The circuit solves the problems of conventional PFC circuit. Just as the on-state losses, switching losses, and the complexity of the control structure and so on. Then PFC circuit topology can be used in high power situations.The structure and work patterns of bridgeless Boost PFC circuit topology were studied. And a variety of sampling circuit of bridgeless circuit was also studied. The paper analyzes the basic principles, development, and classification of soft-switching technology, and studies and analyzes a variety of circuit of bridgeless PFC soft-switching technology. Using bridgeless main topology and soft-switching circuit reduced the conduction losses in the circuit, the switching losses and switching noise. And the system efficiency of the whole circuit was improved.Take boost PFC circuit for example, the basic theory of one-cycle control was analyzed. And the structure and the external circuit of the IR1150chip based on one-cycle control made a brief introduction. The stability of the one-cycle control PFC circuit was simply analyzed. The one-cycle control in other current control technology application also simply introduced.2.5kW one-cycle-control of soft-switching bridge Boost PFC circuit was designed and researched. At the same time the parameters of the main circuit, the soft-switching circuit and the control circuit were also designed and calculated in detail.Finally, the soft-switching bridgeless boost PFC circuit is modeled and simulation analysis by the software of Matlab/Simulink to verify the circuit feasibility and advantages. The design of one-cycle control soft-switching bridgeless PFC circuit is analyzed actually through hardware experimental circuit. The experimental waveforms and the data analysis results of the circuit verified the correctness and feasibility of the circuit.