Overcurrent limiter having inductive compensation
US6166619A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1996 |
| Grant date | Dec 26, 2000 |
| Priority date | — |
| Expiry date | Nov 12, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C1/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Current limiters, preferably PTC resistors, are used for limiting short-circuit current when connected in series to capacitors and converter valves. Protective devices operating with these PTC resistors are able to work reversibly and respond without arcing. They have a low inductance and can be used in space-saving designs. Protective circuits with such PTC resistors have a low loss, are shake-proof, and can be integrated into an existing cooling circuit. They respond autonomously and enable a flexible application. The PTC resistors preferably are constructed in a meander shape of porous metal foam or a metal braid or fabric and have electrical contact bridges between their resistor tracks. At least 2 resistor tracks that are electrically connected in parallel are arranged at a small distance on top of each other in such a way that partial currents (I1, I2) flow in opposite directions through resistor branches in superposed track areas formed in this manner. The resistor tracks can also be arranged in grooves of a cooling body or may have a circular shape. A compensation resistor for compensating uncompensated marginal areas of these resistor tracks can be provided in serial conne…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.