Full-Digital AC-DC Converter With PFC Based on Counting
Full-Digital AC-DC Converter With PFC Based on Counting
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DOI：
10.1109/tii.2014.2373339
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发表时间：
2015-02
影响因子：
12.3
通讯作者：
K. Hwu;Y. Yau;Y. C. Chang
中科院分区：
文献类型：
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作者：
K. Hwu;Y. Yau;Y. C. Chang
本文提出了一种基于计数的具有功率因数校正（PFC）的全数字交流-直流转换器。对于数字输出电压信息，它是通过将正三角波和负三角波注入到感测的输出电压中，将所得信号与输出参考电压进行比较，并基于现场可编程门阵列（FPGA）中的一个计数器对所得信号的低电平进行计数来获得的。对于数字电感电流信息，是通过将正锯齿波与滤波后检测到的电感电流进行比较，并根据FPGA中的另一个计数器对所得信号的低电平进行计数来获得的。另一方面，电流控制器的正弦参考指令是通过过零检测电路触发FPGA中的正弦表获得的。该正弦参考命令与传统的平均电流控制方法一起产生合适的控制效果来驱动功率开关，从而将输出电压控制在期望值，同时输入电流尽可能紧密地跟随输入电压。最重要的是，所提出的采样方法可以应用于连续传导模式（CCM）、不连续传导模式（DCM）或两者。最后，提供了一些实验结果来验证所提出的采样方法的有效性。
In this paper, a full-digital ac-dc converter with power factor correction (PFC)-based on counting is presented. As for the digital output voltage information, it is obtained by injecting the positive and negative triangular wave into the sensed output voltage, comparing this resultant signal with the output voltage reference, and counting the low level of the resulting signal based on one counter in the field programmable gate array (FPGA). As for the digital inductor current information, it is obtained by comparing the positive sawtoothed wave with the sensed inductor current after filtering and counting the low level of the resulting signal based on another counter in the FPGA. On the other hand, the sinusoidal reference command for the current controller is obtained by triggering the sinusoidal table in the FPGA via the zero crossing detecting circuit. This sinusoidal reference command, together with the traditional average current control method, generates a suitable control effort to drive the power switch such that the output voltage is controlled at a desired value and at the same time the input current follows the input voltage as tightly as possible. Above all, the proposed sampling method can be applied to the continuous conduction mode (CCM), the discontinuous conduction mode (DCM), or both. Finally, some experimental results are offered to verify the effectiveness of the proposed sampling method.