Electronic component for limiting the inrush current

Patent metadata

Field	Value
Publication number	US-11289244-B2
Application number	US-201716090805-A
Country	US
Kind code	B2
Filing date	Apr 18, 2017
Priority date	Apr 28, 2016
Publication date	Mar 29, 2022
Grant date	Mar 29, 2022

Abstract

An electronic component is disclosed. In an embodiment, an electronic component includes at least one NTC element and at least two electrically conductive contact elements, wherein the NTC element is electrically conductively connected to a respective contact element via a connection material, and wherein a coefficient of thermal expansion of the contact elements is adapted to a coefficient thermal expansion of the NTC element.

First claim

The invention claimed is:

1. An electronic component comprising:
at least one Negative Temperature Coefficient (NTC) element; and
at least two electrically conductive contact elements,
wherein the NTC element is electrically conductively connected to a respective contact element via a connection material, and
wherein a coefficient of thermal expansion of the contact elements is approximately equal to a coefficient of thermal expansion of the NTC element,
wherein the NTC element comprises La (1-x) EA (x) Mn (1-a-b-c) Fe (a) Co (b) Ni (c) O (3±δ) , wherein 0≤x≤0.5 and 0≤(a+b+c)≤0.5,
wherein EA denotes an alkaline earth metal element and δ denotes a deviation from a stoichiometric oxygen ratio,
wherein the alkaline earth metal element EA is selected from the group consisting of magnesium, calcium, strontium and barium, and
wherein |δ|≤0.5.

2. The electronic component according to claim 1 , wherein the contact elements comprise a layer construction of copper-invar/kovar-copper with a thickness ratio of 10%≤copper≤30%-50%≤invar/kovar≤80%-10%≤copper≤30%.

3. The electronic component according to claim 1 , wherein the NTC element has a nominal resistance R 25 ≤1Ω at a temperature of 25° C.

4. The electronic component according to claim 1 , wherein the NTC element has a top side and an underside, and wherein the top side and the underside are electrically conductively contacted at least partly by the respective contact element.

5. The electronic component according to claim 1 , wherein the contact elements comprise a material composite.

6. The electronic component according to claim 1 , wherein the contact elements comprise copper and invar or kovar.

7. The electronic component according to claim 1 , wherein the connection material comprises sintering silver.

8. The electronic component according to claim 1 , wherein the NTC element comprises two, three or more segments.

9. The electronic component according to claim 1 , wherein an electrical resistivity of the NTC element in a basic state of the electronic component is ≤2 Ωcm.

10. The electronic component according to claim 1 , wherein the contact elements have a thickness d, and wherein 0.3 mm≤d≤0.8 mm.

11. The electronic component according to claim 1 , wherein the NTC element has a thickness d, and wherein 100 μm≤d≤600 μm.

12. The electronic component according to claim 1 , wherein the electronic component comprises a plurality of NTC elements and a plurality of contact elements, and wherein the NTC elements are connected in parallel with one another.

13. The electronic component according to claim 12 , wherein the NTC elements are arranged one above another in a stacked fashion, wherein a respective contact element is arranged between two adjacent NTC elements, and wherein the NTC elements are thermally coupled to one another via the contact elements.

14. The electronic component according to claim 1 , wherein the NTC element has a coefficient of thermal expansion of between 7 ppm/K and 10 ppm/K.

15. The electronic component according to claim 1 , further comprising a securing element, wherein the securing element has an electrical resistance which is equal to or only slightly higher than a resistance of the NTC element at low operating temperatures.

16. An electronic component comprising:
at least one Negative Temperature Coefficient (NTC) element;
at least two electrically conductive contact elements,
wherein the NTC element is electrically conductively connected to a respective contact element via a connection material, and
wherein a coefficient of thermal expansion of the contact elements is approximately equal to a coefficient thermal expansion of the NTC element; and
a securing element,
wherein the securing element has an electrical resistance,
wherein the electrical resistance of the securing element is equal to or only slightly higher than an electrical resistance of the NTC element at low operating temperatures, and
wherein the securing element is configured to provide an electrical connection so that an electrical power is still be transferable through the electronic component in a limited amount when a conductive connection between the NTC element and the contact elements breaks.

17. The electronic component according to claim 16 , wherein the NTC element has a top side and an underside, and wherein the top side and the underside are electrically conductively contacted at least partly by the respective contact element.

18. The electronic component according to claim 17 , wherein the NTC element has a nominal resistance R 25 ≤1Ω at a temperature of 25° C.

19. The electronic component according to claim 16 , wherein the contact elements have a thickness d, and wherein 0.3 mm≤d≤0.8 mm.

20. The electronic component according to claim 19 , wherein the NTC element has a thickness d, and wherein 100 μm≤d≤600 μm.

Assignees

• Epcos Ag

Inventors

• Wischnat Volker
• Hofrichter Alfred
• Rinner Franz

Classifications

• H01C7/06 Primary

  including means to minimise changes in resistance with changes in temperature · CPC title

• H01C7/042

  mainly consisting of inorganic non-metallic substances (H01C7/041 takes precedence) · CPC title

• H01C7/04

  having negative temperature coefficient · CPC title

• H01C7/001

  Mass resistors · CPC title

• H01C1/1413 Primary

  Terminals or electrodes formed on resistive elements having negative temperature coefficient · CPC title