EMI suppression with shielded common mode choke
AssigneeMicrosemi Corporation
InventorsHwangsoo Choi, Mike Lewis, Shiju Wang
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Abstract
A power supply arrangement constituted of: an isolated power supply having a primary side and a secondary side, the secondary side electrically isolated from the primary side; a common mode choke having a first winding and a second winding wound on a common core, the common mode choke coupled between the primary side of the isolated power supply and an AC mains; and a shielding surrounding the common mode choke, the shielding coupled to a common potential of the secondary side of the isolated power supply.
Claims6
A power supply arrangement comprising:
- an isolated power supply having a primary side and a secondary side, said secondary side electrically isolated from said primary side, such that a common potential of said secondary side is electrically isolated from a common potential of said primary side;
- a common mode choke having a first winding and a second winding wound on a common core, said common mode choke coupled between said primary side of said isolated power supply and an AC mains;
- and
- a shielding surrounding said common mode choke, said shielding connected to the electrically isolated common potential of said secondary side of said isolated power supply.
A method of electromagnetic interference suppression for use with an isolated power supply having a primary side and a secondary side, the method comprising:
- providing a common mode choke having a first winding and a second winding;
- shielding said provided common mode choke with a shield arranged to substantially surround both the first winding and the second winding;
- and
- connecting said shield of said provided common mode choke to a common potential of the secondary side of the isolated power supply, said common potential of the secondary side of the isolated power supply electrically isolated from a common potential of the primary side of the isolated power supply.
Dependencies are inferred from the claim text.