Resistor with temperature coefficient of resistance (TCR) compensation

Patent metadata

Field	Value
Publication number	US-10217550-B2
Application number	US-201715722536-A
Country	US
Kind code	B2
Filing date	Oct 2, 2017
Priority date	Sep 4, 2009
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

A current sense resistor and a method of manufacturing a current sensing resistor with temperature coefficient of resistance (TCR) compensation are disclosed. The resistor has a resistive strip disposed between two conductive strips. A pair of main terminals and a pair of voltage sense terminals are formed in the conductive strips. A pair of rough TCR calibration slots is located between the main terminals and the voltage sense terminals, each of the rough TCR calibration slots have a depth selected to obtain a negative starting TCR value observed at the voltage sense terminals. A fine TCR calibration slot is formed between the pair of voltage sense terminals.

First claim

What is claimed is:

1. A resistor with temperature coefficient of resistance (TCR) compensation, the resistor comprising:
a resistive strip disposed between a first conductive strip and a second conductive strip;
a first voltage sense terminal and a first main terminal formed in the first conductive strip separated by a first slot at a first side edge of the first conductive strip;
a second voltage sense terminal and a second main terminal formed in the second conductive strip separated by a second slot at a second side edge of the second conductive strip, the first side edge of the first conductive strip and the second side edge of the second conductive strip being on opposite ends of the resistor;
the first voltage sense terminal and the first main terminal formed contiguously in the first conductive strip, and the second voltage sense terminal and the second main terminal formed contiguously in the second conductive strip;
the resistive strip comprising a third slot positioned between the first and second voltage sense terminals, a depth of the third slot configured to adjust a TCR value of the resistor; and,
the resistive strip comprising a fourth slot positioned between the first and second main terminals, a depth of the fourth slot configured to adjust a resistance value of the resistor.

2. The resistor of claim 1 , wherein the first slot and the second slot each have a depth that extends toward the resistive strip.

3. The resistor of claim 2 , wherein the first slot has an opening at the first side of the resistor facing away from the resistive strip, and the second slot has an opening at the second side of the resistor facing away from the resistive strip.

4. The resistor of claim 1 , wherein the fourth slot is formed at an edge of the resistive strip.

5. The resistor of claim 1 , wherein the third slot does not meet either the first slot or the second slot.

6. The resistor of claim 1 , wherein a depth of the first slot and the second slot are configured to adjust a TCR value of the resistor.

7. The resistor of claim 1 , wherein each of the first and second slots has a depth selected to obtain a negative starting TCR value observed at the first and second voltage sense terminals, and wherein the third slot has a depth selected to obtain a TCR value observed at the first and second voltage sense terminals that approaches zero.

8. The resistor of claim 1 , wherein at least a portion of the third slot extends only between the first voltage sense terminal and the second voltage sense terminal.

9. A method of manufacturing a resistor with temperature coefficient of resistance (TCR) compensation, the method comprising:
disposing a resistive strip between a first conductive strip and a second conductive strip;
forming a first slot at a first side of the first conductive strip to form a first voltage sense terminal and a first main terminal in the first conductive strip;
forming a second slot at a second side of the second conductive strip to form a second voltage sense terminal and a second main terminal in the second conductive strip, the first side of the first conductive strip and the second side of the second conductive strip being on opposite sides of the resistor;
forming a third slot in the resistive strip between the first and second voltage sense terminals, the third slot having a depth selected to adjust a TCR value of the resistor; and,
forming a fourth slot in the resistive strip between the first and second main terminals, the fourth slot having a depth selected to adjust a resistance value of the resistor;
wherein the first voltage sense terminal and the first main terminal are formed contiguously in the first conductive strip, and wherein the second voltage sense terminal and the second main terminal are formed contiguously in the second conductive strip.

10. The method of claim 9 , wherein the first slot and the second slot are each formed having a depth that extends toward the resistive strip.

11. The method of claim 10 , wherein the first slot is formed having an opening at the first side of the first conductive strip facing away from the resistive strip, and the second slot is formed having an opening at the second side of the second conductive strip facing away from the resistive strip.

12. The method of claim 9 , wherein the fourth slot is formed at an edge of the resistive strip.

13. The method of claim 9 , wherein the third slot is formed such that it does not meet either the first slot or the second slot.

14. The method of claim 9 , wherein a depth of the first slot and the second slot are selected to adjust a TCR value of the resistor.

15. The method of claim 9 , wherein each of the first and second slots has a depth selected to obtain a negative starting TCR value observed at the first and second voltage sense terminals, and wherein the third slot has a depth selected to obtain a TCR value observed at the first and second voltage sense terminals that approaches zero.

16. The method of claim 9 , wherein the third slot is formed such that at least a portion of the third slot extends only between the first voltage sense terminal and the second voltage sense terminal.

17. A resistor with temperature coefficient of resistance (TCR) compensation, the resistor comprising:
a resistive strip disposed between a first conductive strip and a second conductive strip;
a first voltage sense terminal and a first main terminal formed in the first conductive strip separated by a first slot at a first side edge of the first conductive strip;
a second voltage sense terminal and a second main terminal formed in the second conductive strip separated by a second slot at a second side edge of the second conductive strip, the first side edge of the first conductive strip and the second side edge of the second conductive strip being on opposite ends of the resistor;
the resistive strip comprising a third slot positioned between the first and second voltage sense terminals, a depth of the third slot configured to adjust a TCR value of the resistor, wherein the third slot does not meet either the first slot or the second slot; and,
the resistive strip comprising a fourth slot positioned between the first and second main terminals, a depth of the fourth slot configured to adjust a resistance value of the resistor.

18. A resistor with temperature coefficient of resistance (TCR) compensation, the resistor comprising:
a resistive strip disposed between a first conductive strip and a second conductive strip;
a first voltage sense terminal and a first main terminal formed contiguously in the first conductive strip separated by a first slot at a first side edge of the first conductive strip, the first voltage sense terminal and the first main terminal formed contiguously in the first conductive strip;
a second voltage sense terminal and a second main terminal formed contiguously in the second conductive strip separated by a second slot at a second side edge of the second conductive strip, the second voltage sense terminal and the second main terminal formed contiguously in the second conductive strip, the first side edge of the first conductive strip and the second side edge of the second conductive strip forming opposite edges of the resistor;
the resistive strip comprising a third slot positioned between the first and second voltage sense terminals, a depth of the third slot configured to adjust a TCR value of the resistor; and,
the resistive strip comprising a fourth slot positioned between the first and second main terminals.

Assignees

• Vishay Dale Electronics Llc

Inventors

• Smith Clark L
• Bertsch Thomas L
• Wyatt Todd L
• Veik Thomas L

Classifications

• Y10T29/49082

  Resistor making · CPC title

• H01C17/232

  Adjusting the temperature coefficient; Adjusting value of resistance by adjusting temperature coefficient of resistance · CPC title

• H01C7/02

  having positive temperature coefficient · CPC title

• G01R1/203

  Resistors used for electric measuring, e.g. decade resistors standards, resistors for comparators, series resistors, shunts (resistors in general H01C; microwave or radiowave terminations H01P1/26; coupling devices H01R) · CPC title

• H01C1/148 Primary

  the terminals embracing or surrounding the resistive element (H01C1/142 takes precedence) · CPC title