Method for confectioning resistors, resistor, and heating device

Patent metadata

Field	Value
Publication number	US-12417866-B2
Application number	US-202117554739-A
Country	US
Kind code	B2
Filing date	Dec 17, 2021
Priority date	Nov 25, 2021
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

This disclosure refers to a method for confectioning resistors that each comprise a PTC ceramic plate and metallic electrode layers covering opposite faces of the ceramic plate, said method comprising the following steps: measuring an electrical resistance of a resistor to be confectioned by applying an electrical potential to one of electrode layers such that an electric current flows from one of the electrode layers through the ceramic plate to the electrode layer on the opposite face of the ceramic plate, comparing the measured resistance to a target resistance, and removing, if the measured resistance is lower than the target resistance, a section of at least one of the electrode layers. This disclosure also refers to such a resistor and a heating device comprising such resistors.

First claim

What is claimed is:

1. A method for confectioning resistors that each comprise a PTC ceramic plate and metallic electrode layers covering opposite faces of the ceramic plate, said method comprising:
measuring an electrical resistance of each resistor to be confectioned by applying an electrical potential to one of the electrode layers such that an electric current flows from the one electrode layer through the ceramic plate to the electrode layer on the opposite face of the ceramic plate;
comparing the measured resistance to a target resistance;
identifying at least one resistor wherein the measured resistance is lower than the target resistance; and
removing a section of at least one of the electrode layers of the at least one resistor as a function of a difference between the target resistance and the measured resistance.

2. The method according to claim 1 , wherein the section of at least one of the electrode layers that is removed, if the measured resistance is lower than the target resistance, is a rim section.

3. The method according to claim 1 , wherein a section of both electrode layers is removed if the measured resistance is lower than the target resistance.

4. The method according to claim 3 , wherein both electrode layers are congruent.

5. The method according to claim 1 , wherein the area of the removed section increases as the difference between the target resistance and the measured resistance increases.

6. The method according to claim 1 , wherein the section of the electrode layer is removed by laser ablation.

Assignees

• Borgwarner Inc

Inventors

• Garcia Julio Abraham Carrera

Classifications

• F24H9/1827

  Positive temperature coefficient [PTC] resistor · CPC title

• H01C17/24 Primary

  by removing or adding resistive material (H01C17/23, H01C17/232, H01C17/235 take precedence) · CPC title

• H05B2203/02

  Heaters using heating elements having a positive temperature coefficient · CPC title

• H05B2203/017

  Manufacturing methods or apparatus for heaters · CPC title

• H05B3/44

  heating conductor arranged within rods or tubes of insulating material · CPC title