NTC Ceramic Part, Electronic Component for Inrush Current Limiting, and Method for Manufacturing an Electronic Component

Patent metadata

Field	Value
Publication number	US-2018301253-A1
Application number	US-201616063266-A
Country	US
Kind code	A1
Filing date	Dec 13, 2016
Priority date	Dec 16, 2015
Publication date	Oct 18, 2018
Grant date	—

Abstract

An NTC ceramic part, an electronic component for inrush current limiting, and a method for manufacturing an electronic component are disclosed. In an embodiment, an NTC ceramic part for use in an electronic component for inrush current limiting is disclosed, wherein the NTC ceramic part has an electrical resistance in the mΩ range at a temperature of 25° C. and/or at room temperature.

First claim

1 - 16 . (canceled)

17 . An NTC ceramic part for use in an electronic component for inrush current limiting, wherein the NTC ceramic part has an electrical resistance in a mΩ range at a temperature of 25° C. and/or at room temperature.

18 . The NTC ceramic part according to claim 17 ,
wherein the NTC ceramic part 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 wherein δ denotes a deviation from a stoichiometric oxygen ratio.

19 . The NTC ceramic part according to claim 18 , wherein the alkaline earth metal element is selected from the group consisting of magnesium, calcium, strontium, and barium, and/or wherein |δ|≤0.5.

20 . An electronic component comprising:
at least one functional layer, wherein the functional layer comprises an NTC ceramic part for inrush current limiting, wherein the NTC ceramic part has an electrical resistance in a mΩ range at a temperature of 25° C. and/or at room temperature.

21 . The electronic component according to claim 20 , wherein an electrical resistivity of the at least one functional layer in a basic state of the electronic component is between 0.1 Ωcm and 2.0 Ωcm.

22 . The electronic component according to claim 20 , wherein the component has a thickness of less than or equal to 1.0 mm.

23 . The electronic component according to claim 20 , wherein the component is a monolithic component.

24 . The electronic component according to claim 23 , wherein the component comprises exactly one functional layer, wherein the functional layer has a thickness of less than or equal to 1.0 mm, and wherein a metallization is arranged on the functional layer.

25 . The electronic component according to claim 24 , wherein the metallization comprises silver, copper or gold.

26 . The electronic component according to claim 20 , wherein the component is a multilayer component.

27 . The electronic component according to claim 26 , wherein the component comprises a plurality of functional layers, first internal electrodes and second internal electrodes arranged one above another to form a stack, wherein each of the first and second internal electrodes is arranged between two adjacent functional layers, wherein the first internal electrodes are electrically conductively connected to a first external contact and the second internal electrodes are electrically conductively connected to a second external contact, and wherein the functional layers are arranged and configured such that both, the first and second external contacts, in a basic state and in a hot state of the electronic component, are electrically conductively connected to one another via the functional layers.

28 . The electronic component according to claim 20 , wherein the component is thermally linked at least to a heat sink in order to limit heating of the component during operation of the component, and wherein the heat sink comprises copper.

29 . The electronic component according to claim 20 ,
wherein the NTC ceramic part 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 wherein δ denotes a deviation from a stoichiometric oxygen ratio.

30 . The electronic component according to claim 29 , wherein the alkaline earth metal element is selected from the group consisting of magnesium, calcium, strontium and barium, and/or wherein |δ|≤0.5.

31 . A method for manufacturing an electronic component according to claim 20 , the method comprising:
providing a ceramic powder, calcining the ceramic powder; admixing the ceramic powder with water and a binder in order to produce a granulated material; pressing the granulated material; sintering the granulated material; and contacting the sintered material with a silver paste.

32 . A method for manufacturing an electronic component according to claim 20 , the method comprising:
providing green sheets; printing the green sheets with internal electrodes; stacking the green sheets comprising the internal electrodes to form a stack; sintering the stack; and forming external contacts at the stack.

33 . A system comprising:
at least one electronic component according to claim 20 ; and a consumer device electrically connected in series with the electronic component, wherein both, the electronic component and the consumer device, are exposed to an ambient temperature, and wherein the system is configured such that a heating time is coordinated with an electrical start-up time of the consumer device, which determines when an inrush current has fallen to a rated current of the consumer device.

34 . The system according to claim 33 , wherein the system comprises three electronic components, and wherein the components are connected in parallel with one another.

Assignees

• Epcos Ag

Inventors

• Grünbichler Hermann
• Schweinzger Manfred
• Rinner Franz

Classifications

• H01C17/281

  by thick film techniques · CPC title

• H01C7/046 Primary

  Iron oxides or ferrites · CPC title

• H01C7/13

  current-responsive · CPC title

• H01C1/1413

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

• H02H9/001

  limiting speed of change of electric quantities, e.g. soft switching on or off (progressive control of electronic switches for eliminating interferences H03K17/16) · CPC title