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Method and arrangement for harmonic-wave suppression for AC voltage-operated PTC heaters

  • US 7,884,503 B2
  • Filed: 03/13/2008
  • Issued: 02/08/2011
  • Est. Priority Date: 03/14/2007
  • Status: Active Grant
First Claim
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1. A method for harmonic-wave suppression in AC voltage-operated PTC heaters, in which the harmonic waves are compensated by superimposing with a generated current inverted relative to a harmonic wave component, comprisinggenerating a correction current by means of an ohmic resistor in a correction current circuit arranged in parallel to said PTC heater included in a load current circuit,wherein said correction current is modulated for suppressing a third harmonic of a heating current current of said PTC heater and superimposed additively;

  • wherein an instantaneous value of a voltage of said load current circuit is used for modulating the correction current in a correction current circuit.

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