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Compensated active electro-magnetic interference filters

  • US 10,374,510 B2
  • Filed: 09/26/2017
  • Issued: 08/06/2019
  • Est. Priority Date: 04/07/2017
  • Status: Active Grant
First Claim
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1. An active electromagnetic interference (EMI) filter, comprising:

  • an amplifier having an output and an inverting input;

    a frequency compensation network comprising a resistor and a capacitor, the resistor and the capacitor adapted to be coupled in series between a reference conductor and a power conductor;

    a first sense capacitor having a first terminal and a second terminal, the first terminal of the first sense capacitor adapted to be coupled to the power conductor;

    a second sense capacitor having a first terminal and a second terminal, the first terminal of the second sense capacitor being coupled to the inverting input of the amplifier, and the second terminal of the second sense capacitor being coupled to the second terminal of the first sense capacitor;

    a first injection capacitor having a first terminal and a second terminal, the first terminal of the first injection capacitor adapted to be coupled to the power conductor; and

    a second injection capacitor having a first terminal and a second terminal, the first terminal of the second injection capacitor being coupled to the output of the amplifier, and the second terminal of the second injection capacitor being coupled to the second terminal of the first injection capacitor;

    the amplifier configured to sense noise signals on the power conductor and drive a cancellation signal onto the power conductor.

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