Patent ID: 8324871

Claim:
A multi-loop power factor correction circuit comprising: a first rectifier circuit for rectifying an input AC voltage into a rectified voltage; an integrated multi-inductor magnetic member comprising a first slab, a second slab, a middle post between said first slab and said second slab, plural lateral posts between said first slab and said second slab, and plural winding coil assemblies, wherein said winding coil assemblies are wound around respective lateral posts to form at least a first inductor and a second inductor, a first terminal of said first inductor and a first terminal of said second inductor are connected to said first rectifier circuit, a second terminal of said first inductor and a second terminal of said second inductor are respectively connected to a first connecting node and a second connecting node, and the magnetic flux cross-section area of said middle post is smaller than the sum of the magnetic flux cross-section areas of said lateral posts; plural switching circuits comprising at least a first switching circuit and a second switching circuit, wherein said first switching circuit and said second switching circuit are respectively connected to said first connecting node and said second connecting node; plural rectifying elements comprising at least a first rectifying element and a second rectifying element, wherein said first rectifying element is interconnected between said first connecting node and a power output terminal, and said second rectifying element is interconnected between said second connecting node and said power output terminal; and a power factor correction controlling circuit connected to a common terminal, said first rectifier circuit and control terminals of said switching circuits, wherein said switching circuits are alternately conducted, so that the distribution of an input AC current is similar to the waveform of said input AC voltage.