DCM Boost PFC数字化的研究

传统断续导通模式的Boost PFC采用单电压环控制算法实现,但存在输入电流畸变大、功率因数不高的问题,从理论的角度深入分析了单电压环控制法不足的原因,根据Boost PFC电路在断续导通模式下的输入输出电压比,利用功率守恒原则,提出了适用于断续导通模式的DCM预测电流法,与单电压环控制法相比电流畸变、功率因数均得到改善。实验结果验证了理论分析的正确性。

Research on Digital Control Technology of DCM Boost PFC

A single voltage loop is adopted when Boost PFC works in the traditional discontinuous conduction mode （ DCM }. Its disadvantages are the high distortion and low power factor of the input current. In this paper, the disadvantages caused by the single voltage loop method are specifically analyzed, and the DGM current prediction method is presented through application of the power conservation principle on the basis of the input/output voltage ratio of the Boost PFC circuit in the DCM. Compared with the single voltage loop method, the current distortion and power factor are both improved. Experimental results verify the correctness of theoretical analysis.