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Leakage reduction circuit

  • US 10,063,156 B2
  • Filed: 03/27/2014
  • Issued: 08/28/2018
  • Est. Priority Date: 03/27/2014
  • Status: Active Grant
First Claim
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1. A power adapter comprising:

  • a primary circuit portion configured to be connected to an alternating current (AC) power source;

    a secondary circuit portion operably connected to the primary circuit portion and configured to convert AC power received from the primary circuit portion into direct current (DC) power;

    a connector operably connected to the secondary circuit portion and connectable to a client device to provide DC power from the secondary circuit portion to the client device; and

    a leakage reduction circuit configured to provide a noise return path from the secondary circuit portion to the primary circuit portion and to reduce high voltage leakage from the primary circuit portion to the secondary circuit portion, the leakage reduction circuit including;

    a first Y-capacitor operably connected between a secondary ground of the secondary circuit portion and a primary ground of the primary circuit portion;

    a second Y-capacitor operably connected between the secondary ground of the secondary circuit portion and an AC neutral connection of the primary circuit portion, the second Y-capacitor setting an AC voltage on the secondary ground to zero with respect to the AC neutral connection, the first Y-capacitor and the second Y-capacitor having a same nominal capacitance value; and

    an X-capacitor operably connected between the AC neutral connection and an AC line input of the primary circuit portion.

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