为了消除电网谐波污染、提高功率因数，需要在电子设备的输入端增加功率因数校正(Power Factor Correction，PFC)变换器。由于脉动的瞬态输入功率与恒定输出功率之间的不平衡，PFC变换器的输出电压/电流含有较大的二倍工频纹波，且PFC变换器的动态响应速度较慢，对于突变的负载不能及时调整输出电压/电流。针对以上问题本文设计了一种串联补偿反激式PFC变换器。

论文对串联补偿反激式PFC变换器的工作原理、电路特性和控制策略进行了研究。首先分析了变换器的功率因数校正机理，推导出实现单位功率因数时占空比的变化关系；通过建立变换器的能量传输等效模型，对比分析了本文研究的变换器与单级PFC变换器和两级级联PFC变换器三者的效率，理论分析表明本文研究的变换器效率介于两极和单极变换器效率之间；然后推导出了输出端二倍工频纹波电压峰峰值的表达式，从而得到了变换器实现输出电压低纹波的条件。为了获得更好的纹波补偿效果，采用状态空间平均法建立了Buck RCC小信号模型，由此得出功率级传递函数，并根据开环传递函数进行了补偿网络的设计；最后以双输出反激PFC变换器为基础，通过在其输出端引入Buck纹波补偿电路(Ripple Cancellation Circuit, RCC)，设计了反激主电路、Buck补偿电路、开关驱动电路和保护电路等功率电路和基于NCP1652的控制电路。

为验证理论分析及参数设计的正确性，搭建了一台85W的实验样机。实验结果表明，本文研究的串联补偿反激式PFC变换器具有高功率因数的同时，不仅可以实现输出电压低纹波，且具有快速动态响应速度和较高的效率。

In order to eliminate the harmonic pollution of the power grid and improve the power factor, it is necessary to add a power factor correction (PFC) converter at the input end of the electronic device. Due to the imbalance between the pulsating transient input power and the constant output power, the output voltage/current of the PFC converter contains a large double power frequency ripple, and the dynamic response speed of the PFC converter is slow. The load cannot adjust the output voltage/current in time. Aiming at the above problems, this paper designs a series-compensated flyback PFC converter.

The paper studies the working principle, circuit characteristics and control strategy of the series-compensated flyback PFC converter. Firstly, the power factor correction mechanism of the converter is analyzed, and the relationship of the duty cycle change when the unit power factor is realized is deduced. By establishing the equivalent energy transmission model of the converter, the converter and the single-stage PFC converter studied in this paper are compared and analyzed. The theoretical analysis shows that the efficiency of the converter studied in this paper is between the efficiency of two-pole and single-pole converters; and then the peak-to-peak value of the double power frequency ripple voltage at the output is derived. Expression, thereby obtaining the conditions for the converter to achieve low ripple in the output voltage. In order to get a better ripple compensation effect, the Buck RCC small signal model is established by using the state space averaging method, and the power stage transfer function is obtained from this, and the compensation network is designed according to the open loop transfer function; Finally, based on the dual-output flyback PFC converter, through the introduction of Buck ripple compensation circuit (Ripple Cancellation Circuit, RCC) at its output, the flyback main circuit, Buck compensation circuit, switch drive circuit and protection circuit are designed. Circuit and control circuit based on NCP1652.

In order to verify the correctness of the theoretical analysis and parameter design, an 85W experimental prototype was built. The experimental results show that the series-compensated flyback PFC converter studied in this paper has a high power factor, and not only achieving low output voltage ripple, but also has a fast dynamic response speed.

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