RESISTOR WITH TEMPERATURE COEFFICIENT OF RESISTANCE (TCR) COMPENSATION

• US 20190326038A1
• Filed: 02/25/2019
• Published: 10/24/2019
• Est. Priority Date: 09/04/2009
• Status: Active Grant

• Current Assignee: Vishay Dale Electronics, LLC (Vishay Intertechnology Incorporated)
• Original Assignee: Vishay Dale Electronics, LLC (Vishay Intertechnology Incorporated)
• Inventors: Smith, Clark L., Bertsch, Thomas L., Wyatt, Todd L., Veik, Thomas L.
• Granted Patent: US 10,796,826 B2
• Time in Patent Office: Days
• CPC Class Codes: G01R 1/203 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 Class Codes: G01R 19/0092 measuring current only all subgroups of G01R19/00 take precedence
• CPC Class Codes: G01R 19/32 Compensating for temperature change
• CPC Class Codes: H01C 1/00 Details
• CPC Class Codes: H01C 1/148 the terminals embracing or surrounding the resistive element H01C1/142 takes precedence
• CPC Class Codes: H01C 17/232 Adjusting the temperature coefficient; Adjusting value of resistance by adjusting temperature coefficient of resistance
• CPC Class Codes: H01C 17/28 adapted for applying terminals
• CPC Class Codes: H01C 7/06 including means to minimise changes in resistance with changes in temperature
• CPC Class Codes: Y10T 29/49082 Resistor making
• CPC Class Codes: Y10T 29/49101 Applying terminal

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.

Claims

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 an outer 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 an outer edge of the second conductive strip, the outer edge of the first conductive strip and the outer edge of the second conductive strip being on opposite sides of the resistor;

a third slot formed at an edge of the resistive strip between the first and second voltage sense terminals; and

,

a fourth slot formed in the resistive strip between the first and second main terminals.

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 outer edge of the first conductive strip facing away from the resistive strip, and the second slot has an opening at the outer edge of the second conductive strip 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 first voltage sense terminal and the first main terminal and 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.

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

7. The resistor of claim 1, wherein a depth of the first slot and the second slot are selected to calibrate a TCR value of the resistor.

8. The resistor of claim 7, wherein a depth of the third slot is selected to calibrate a TCR value of the resistor.

9. 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.

10. 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.

11. 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 an outer edge 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 an outer edge of the second conductive strip to form a a second voltage sense terminal and a second main terminal in the second conductive strip, the outer edge of the first conductive strip and the outer edge of the second conductive strip being on opposite sides of the resistor;

forming a third slot at an edge of the resistive strip between the first and second voltage sense terminals; and

,

forming a fourth slot in the resistive strip between the first and second main terminals.

12. The method of claim 11, wherein the first slot and the second slot are each formed having a depth that extends toward the resistive strip.

13. The method of claim 12, wherein the first slot is formed having an opening at the outer edge of the first conductive strip facing away from the resistive strip, and the second slot is formed having an opening at the outer edge of the second conductive strip facing away from the resistive strip.

14. The method of claim 11, wherein the fourth slot is formed at an edge of the resistive strip.

15. The method of claim 11, wherein the first voltage sense terminal and the first main terminal and 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.

16. The method of claim 11, wherein the third slot is formed such that it does not meet either the first slot or the second slot.

17. The method of claim 11, wherein a depth of the first slot and the second slot are selected to calibrate a TCR value of the resistor.

18. The method of claim 17, wherein a depth of the third slot is selected to calibrate a TCR value of the resistor.

19. The method of claim 11, 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.

20. The method of claim 11, 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.