Current indicator for fault assessments of loop circuit integrity while providing circuit isolation
US6424136B1 · kind B1 · utility
9Cited by
4References
20Claims
0Family size
Inventor
Key dates
| Filing date | May 4, 2000 |
| Grant date | Jul 23, 2002 |
| Priority date | — |
| Expiry date | May 4, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/15
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A current detector/indicator for DC has a transistor (1) and an LED (2). They are arranged so that current flow through the LED causes the transistor to conduct, shunting excess current away from the LED and through the transistor. For AC, the circuit can be doubled, with transistors and LEDs arranged with inverse polarity. A triac (15) may supplant the two transistors, with parallel, opposed LEDs (16) in its gate circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.