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Heater wire safety circuit

  • US 9,089,010 B2
  • Filed: 11/29/2011
  • Issued: 07/21/2015
  • Est. Priority Date: 11/29/2010
  • Status: Active Grant
First Claim
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1. A heater wire safety circuit for use with an electric blanket or heating pad, which comprises:

  • a first heater circuit and a second heater circuit, wherein the first heater circuit includes;

    a first heater conductor to provide heat to the electric blanket or heating pad over at least a portion thereof, the first heater conductor having a first end and a second end situated opposite to the first end;

    a second heater conductor to provide heat to the electric blanket or heating pad over at least a portion thereof, the second heater conductor having a first end and a second end situated opposite to the first end of the second heater conductor;

    a first low melt insulate layer situated between the first heater conductor and the second heater conductor along at least a portion of the length of at least one of the first heater conductor and the second heater conductor, the second end of the second heater conductor being connected to the first end of the first heater conductor; and

    a first polymetric positive temperature coefficient (PPTC) device, the first PPTC device having a first side connected to the second end of the first heater conductor, and having a second side which is in electrical communication with one of the hot line and the neutral line of a power source;

    and wherein the second heater circuit includes;

    a third heater conductor to provide heat to the electric blanket or heating pad over at least a portion thereof, the third heating conductor having a first end and a second end situated opposite to the first end of the third heater conductor;

    a fourth heater conductor to provide heat to the electric blanket or heating pad over at least a portion thereof, the fourth heater conductor having a first end and a second end situated opposite to the first end of the fourth heater conductor;

    a second low melt insulate layer situated between the third heater conductor and the fourth heater conductor along at least a portion of the length of at least one of the third heater conductor and the fourth heater conductor, the second end of the third heater conductor being connected to the first end of the fourth heater conductor, the second end of the fourth heater conductor being connected to the first end of the second heater conductor and being in electrical communication with one of the neutral line and the hot line of a power source; and

    a second PPTC device, the second PPTC device having a first side which is connected to the first end of the third heater conductor, and having a second side which is in electrical communication with one of the hot line and neutral line of a power source.

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