一种用于单相Boost型PFC中的数字预测算法

本文提出了用于数字控制PFC中的一种新颖的数字控制算法，称为预测算法。它可以得到较高的PF值，并且随着输入电压或者负载电流的变化有近似最快的动态响应。对于一个确定的系统，预测算法根据系统当前的状态参数，可以估算出输出电压和电感电流在下一个开关周期的变化趋势，并且得到一组完美跟踪输入电压轨迹最优的控制序列。在多种仿真条件下的仿真结果证实了预测算法的有效性。当输入电压从90V到265V，负载电流从20%~100%范围变化时，PF值都大于0.998。启动时间和恢复时间分别约为0.1s和0.02s，且无超调。实验结果也验证了设计的有效性。

A digital prediction algorithm for a single-phase boost PFC

A novel digital control algorithm for digital control power factor correction is presented, which is called the prediction algorithm and has a feature of a higher PF (power factor) with lower total harmonic distortion, and a faster dynamic response with the change of the input voltage or load current. For a certain system, based on the current system state parameters, the prediction algorithm can estimate the track of the output voltage and the inductor current at the next switching cycle and get a set of optimized control sequences to perfectly track the trajectory of input voltage. The proposed prediction algorithm is verified at different conditions, and computer simulation and experimental results under multi-situations confirm the effectiveness of the prediction algorithm. Under the circumstances that the input voltage is in the range of 90-265 V and the load current in the range of 20%-100%, the PF value is larger than 0.998. The startup and the recovery times respectively are about 0.1 s and 0.02 s without overshoot. The experimental results also verify the validity of the proposed method.