Feed forward active EMI filters
AssigneeHamilton Sundstrand Corporation
InventorMiaosen Shen
Life of this patent
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Abstract
An apparatus for active feed forward electromagnetic interference (EMI) filtering, including, a noise detection circuit that receives EMI noise occurring at a noise source, and an active feed forward circuit operatively coupled to the noise detection circuit. The active feed forward circuit generates a noise canceling signal based on the EMI noise received by the noise detection circuit. The apparatus further includes a filter operatively coupled to the active feed forward circuit and the noise source, the filter adapted to receive the EMI noise occurring at the noise source and the noise canceling signal from active feed forward circuit, wherein the filter cancels the received EMI noise based on the received noise canceling signal to reduce EMI noise at a load.
Claims11
An apparatus for active feed forward electromagnetic interference (EMI) filtering, comprising:
- a noise detection circuit for receiving EMI noise occurring at a noise source;
- an active feed forward circuit operatively coupled to the noise detection circuit to generate a noise canceling signal based on EMI noise received by the noise detection circuit;
- and
- a filter operatively coupled to the active feed forward circuit and the noise source adapted to receive the EMI noise occurring at the noise source and the noise canceling signal from the active feed forward circuit, wherein the filter cancels received EMI noise based on received noise canceling signal to reduce EMI noise at a load.
A method for active electromagnetic interference (EMI) filtering, comprising:
- determining, via a noise detection circuit, EMI noise occurring at a noise source;
- generating, via an active feed forward sensor operatively coupled to the noise detection circuit, a noise canceling signal based on the determined EMI noise by the noise detection circuit;
- receiving, via a filter operatively coupled to the active feed forward sensor and the noise source, the EMI noise occurring at the noise source and the noise canceling signal from active feed forward sensor;
- and
- canceling, via the filter, the received EMI noise based on the received noise canceling signal to reduce EMI noise at a load.
Dependencies are inferred from the claim text.