Indicator drive circuit
US8773040B2 · kind B2 · utility
1Cited by
2References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 22, 2011 |
| Grant date | Jul 8, 2014 |
| Priority date | — |
| Expiry date | Nov 15, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An indicator drive circuit includes a current mirror circuit including a first transistor located at a control side and a second transistor located at a controlled side, a current through the current mirror circuit being switched by an external control signal, a current source adapted to feed a control current to the first transistor of the current mirror circuit, and a switching element adapted to be driven by a current through the second transistor of the current mirror circuit and to switch on or off an indicator light source. The current source includes two transistors cascode-connected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.