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HIGH-FREQUENCY CURRENT REDUCTION DEVICE

  • US 20150003124A1
  • Filed: 05/29/2012
  • Published: 01/01/2015
  • Est. Priority Date: 01/27/2012
  • Status: Abandoned Application
First Claim
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1. A high-frequency current reduction device which comprises a noise reduction unit interposed between a first electric device and a second electric device by way of a single connection line between the first electric device and the second electric device, for reducing a high-frequency noise current flowing through the connection line from the first electric device,said noise reduction unit comprising:

  • a detection unit that detects a noise current flowing through the connection line as a voltage;

    a filter device that extracts a desired high-frequency component from the detected voltage by the detection unit;

    a voltage amplifier that amplifies an output from the filter device; and

    a current injection portion that includes a capacitor whose first terminal is connected to an injection point that is placed on the connection line and nearer to the second electric device than to the detection unit between the first electric device and the second electric device, and that injects a high-frequency current to the connection line;

    wherein the detection unit is configured with a detection transformer that includes a conductive line serially connected to the connection line and a winding for current detection, andthe current injection portion applies to a second terminal of the capacitor, an output voltage from the voltage amplifier to thereby inject the high-frequency current in almost the same direction as the noise current into the connection line.

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