This paper first points out the defects of the average current mode control technology currently used in PFC circuits, points out the main reasons for this defect, and proves through theoretical analysis that this defect is inevitable in the average current mode control circuit of the single-phase PFC circuit. Then an improved single-phase PFC control scheme is proposed. And the feasibility and advancement of the scheme are verified by PSpice software simulation. Keywords: power factor corrector; zero-order sampling and holding circuit; simulation; average current control mode With the development of power electronics technology, more and more power electronic equipment are connected to the power grid. The input end of these devices often contains uncontrollable or phase-controlled single-phase or three-phase rectifier bridges, causing serious distortion of the AC input current and generating a large amount of harmonic current injected into the power grid, making the power factor generally only about 0.6. Harmonic current not only causes overheating of transformers, power supply lines and neutral lines, reducing the rated value of electrical appliances, but also generates strong electromagnetic interference, affecting the normal operation of other electronic equipment. For this reason, we must improve the power factor. In this case, PFC technology came into being. Its wide application effectively improves the power factor of the power grid.
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