Voltage fed feed forward active EMI filter
AssigneeHamilton Sundstrand Corporation
InventorMiaosen Shen
Life of this patent
Estimating the term…
Abstract
An apparatus for active feed forward electromagnetic interference (EMI) filtering, including, a noise detection and current reconstruction circuit that receives EMI noise occurring at a noise source, and noise voltage compensation circuit operatively coupled to the noise detection and current reconstruction circuits. The active feed forward circuit generates a noise voltage compensation signal based on the EMI noise reconstructed by the noise detection circuit.
Claims14
An apparatus for active feed forward electromagnetic interference (“EMI”) filtering, comprising:
- a noise voltage detection circuit configured to receive EMI noise occurring at a noise source;
- a current reconstruction circuit configured to reconstruct current associated with EMI noise occurring at a noise source;
- an active feed forward circuit operatively coupled to the noise detection circuit configured to generate a voltage noise compensation 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, wherein the filter is configured to receive the EMI noise occurring at the noise source and the voltage noise compensation signal from the active feed forward circuit, wherein the filter is configured to cancel received EMI noise based on the received voltage noise compensation signal to reduce EMI noise at a load.
A method for active electromagnetic interference (“EMI”) filtering, comprising:
- determining, via a voltage noise detection circuit, EMI noise occurring at a noise source;
- reconstructing, via a current reconstruction circuit;
- current associated with EMI noise occurring at a noise source from the determined voltage from the voltage noise detection circuit;
- generating, via an active feed forward sensor operatively coupled to the noise detection circuit, a voltage noise compensation signal based on the determined EMI noise by the current reconstruction 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 voltage noise compensation signal from active feed forward sensor;
- and
- canceling, via the filter, the received EMI noise based on the received voltage noise compensation signal to reduce EMI noise at a load.
Dependencies are inferred from the claim text.