Method for sorting positive temperature coefficient (PTC) elements
US7605352B2 · kind B2 · utility
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8Claims
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Key dates
| Filing date | Aug 24, 2006 |
| Grant date | Oct 20, 2009 |
| Priority date | — |
| Expiry date | May 10, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C7/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a method for sorting PTC elements having different resistance-temperature characteristics, a predetermined voltage that allows a current to sufficiently decay is applied to each of PTC elements A and B, and the PTC elements are sorted on the basis of the difference between the times required for the currents passing through the PTC elements B to reach a predetermined value (e.g., 52 mA).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.