UBC Theses and Dissertations

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UBC Theses and Dissertations

Design and implementation of a boost active power factor corrector Wu, Kuiyuan


The input current harmonics of the rectifier are very harmful. Not only do they reduce the power factor of the AC-DC converter and cause a lot of electrical energy loss, but also damage other devices and pollute the line power system. Measures should be taken to reduce these harmonics. The commonly used method is to design an effective PFC circuit for the AC-DC converter. In this thesis, a Boost APFC circuit will be discussed in detail. This thesis presents a solution to design an appropriate APFC circuit with one Kilowatts output power and make this APFC circuit work satisfactorily from full load to half load scope. In this thesis, a detailed design process will be described for this project, including topology choice, theoretical calculation of the main components values, the determination of the main components for this circuit, circuit simulation and experimental verification. In the end, a concise conclusion will be made and the future improvement for this project will be introduced. Several commonly used control methods for the Active Power Factor Corrector circuit will be compared and then a good method will be chosen for this project. The average current control method is finally decided to use for this circuit and the basic control chip UC3854 is used to build the control circuit for this project. The simulation and the final experimental results all verify that this is an appropriate choice for this project. According to the schematic design and the simulation revision, a test prototype is built to verify the performance. Several tests are implemented and the final experimental results indicate that this circuit design can satisfy the project specification and it is feasible for this project.

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