Circuit breaker with digital solid-state trip unit fitted with a calibration circuit
US4682264A · kind A · utility
100Cited by
4References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 10, 1986 |
| Grant date | Jul 21, 1987 |
| Priority date | — |
| Expiry date | Feb 10, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/05
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Microprocessor-based solid-state trip unit (48) processing digital signals derived from analog signals supplied by current sensors (16). The analog signals are applied to a calibration circuit (34), which adapts the output range of the analog circuits to that of the logic circuits, to obtain with an 8-bit Analog-to-Digital Converter (50) associated with a Multiplexer (29) a range equivalent to that of 12-bit processing systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.