Over-current protection device
US8169294B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 2010 |
| Grant date | May 1, 2012 |
| Priority date | — |
| Expiry date | Oct 9, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C17/06586
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An over-current protection device comprises two metal foils and a positive temperature coefficient (PTC) material layer. The PTC material layer is sandwiched between the two metal foils and has a volume resistivity below 0.1 Ω-cm. The PTC material layer includes (i) plural crystalline polymers having at least one crystalline polymer of a melting point less than 115° C.; (ii) an electrically conductive nickel filler having a volume resistivity less than 500 μΩ-cm; and (iii) a non-conductive metal nitride filler. The electrically conductive nickel filler and non-conductive metal nitride filler are dispersed in the crystalline polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.