DC input circuit with controlled leakage current
US5111070A · kind A · utility
9Cited by
8References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 18, 1991 |
| Grant date | May 5, 1992 |
| Priority date | — |
| Expiry date | Jan 18, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/0036
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A DC input circuit provides a digital output dependent on an input voltage spanning a low range and a high range. A first transistor current source provides a bounded leakage current for a low range voltage. A parallel transistor current source in series with a voltage breakdown diode provides a second constant current path for high range voltages through a current sensitive switch. The total input current is thus limited, thereby reducing heat dissipation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.