A Common-Mode Choke Using Toroid-EQ Mixed Structure

Wenhua Tan

doi:10.1109/TPEL.2012.2205708

A Common-Mode Choke Using Toroid-EQ Mixed Structure

2013-01-01

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DOI：10.1109/TPEL.2012.2205708

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Electromagnetic interference (EMI) filters are main solutions to suppress the conducted emissions from static power converters. For some years, integration techniques for EMI filters have been widely investigated to realize more compact systems. In this letter, a common-mode (CM) choke with toroid-EQ mixed structure is presented. This structure is constituted of a toroidal CM choke embedded into an EQ core. The proposed toroid-EQ CM choke presents threefold advantages. First, it effectively increases the leakage inductance of the toroidal CM choke and hence increases the differential-mode inductance. Second, it reduces the parasitic coupling between the choke and the filter capacitors. Finally, the component can be easily fabricated with low cost. Experimental verifications have been carried out to validate the effectiveness of the proposed toroid-EQ CM choke.

Keywords:

Choke

electromagnetic interference (EMI)

filter

integration

leakage inductance

A Common-Mode Choke Using Toroid-EQ Mixed Structure

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