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Active Compensation Filter

  • US 20080278229A1
  • Filed: 05/08/2008
  • Published: 11/13/2008
  • Est. Priority Date: 05/10/2007
  • Status: Active Grant
First Claim
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1. An active compensation filter for the application in the electric power supply in a land vehicle, with the compensation filter comprising:

  • a high-pass filter (HP) which is to coupled with a supply voltage line which carries a supply voltage in order to detect frequency and amplitude of interference voltage components of the supply voltage,a signal amplifier connected in series with the high-pass filter, which amplifies the detected interference voltage components andsupplies them as output signals to a coupling element which is connected in series with the signal amplifier and comprises a primary side and a secondary side, with the primary side being fed with the output signals of the signal amplifier and the secondary side being looped into the supply voltage line, characterised in thatthe coupling element comprises a transformer with at least three galvanically separated, magnetically coupled turns, witha tertiary winding being provided in a negative feedback path of the signal amplifier, and withthe negative feedback path leading from an output of the signal amplifier to an input of the signal amplifier.

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