有源滤波对开关电源功率因数进行校正 毕业论文.doc

摘　要 开关电源是实现电能转换和功率传递的重要设备。近年来，随着电力电子技术的快速发展，开关电源因其效率高、性能好、成本低而被广泛应用于国民经济的各个领域，并取得了显著的效益。因此研究设计一款性能稳定、可靠性高的开关电源具有极高的科研意义和商业价值[1]。 本文对Boost型功率因数校正技术进行了分析、设计和研究。详细分析了有源功率因数校正器的基本工作原理，通过比较几种不同拓扑的PFC变换器主电路的优缺点，和比较控制电路的几种不同控制方法的优缺点，明确本文所要研究的对象为平均电流控制（ACM）的Boost型功率因数校正器。 在此基础上对Boost主电路和控制电路进行数学建模，得出其状态方程和传递函数，运用仿真软件MATLAB中的Simulink工具，建立了Boost主电路和控制电路的Simulink仿真模型，并得出其仿真结果。 本文根据Boost变换器的特点和要求，设计了一个具体、实用的带PFC功能的开关电源，并给出了具体设计步骤和电路参数的计算。 平均电流控制的单相Boost功率因数校正电路，完全能够达到整流、高输入功率因数、升压、稳压、低纹波的目标，具有广阔的应用前景。 功率因数校正；Boost变换器；仿真 Abstract Simportant to achieve Power conversion And Power delivery. In reeent years，Swiching power supply is widely used in variouse field of national economy with the development of power electronice technology,and achieveing remarkable result,because of its high effieieney,good performance and low cost.So designing a kind of Switching Power supply with steady Performance and high reliability has high seientific and commercial values. Based on the summary of the fruits of the research of the Active Power Factor Correction, the PFC system, which adopts Boost power converter circuit and Average Current Mode control scheme, is well studied in this thesis. According to the principle and the discussion of the single-phase active power correction, concluding different structures of the main circuit and methods of the controllers, the PFC system, which adopts Boost power converter circuit and Average Current Mode control scheme is indicated as the developing direction of PFC and regarded as PFC system structure. Then, the state differential equations of ideal Boost converter and the general transfer functions of PWM converter are deduced and the simulation models of ideal converter are showed using MATLAB. Besides, we design a practical circuit with the function of PFC, giving discrete design steps and the calculation of the circuit parameters. Finally, we can conclude that the PFC system which adopts Boost power converter circuit and Average Current Mode control