Photocell controlled power supply circuit for an LED
US4330706A · kind A · utility
25Cited by
3References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 10, 1980 |
| Grant date | May 18, 1982 |
| Priority date | — |
| Expiry date | Mar 10, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A power supply for a light emitting diode (2) is governed by two photo diodes (6,7) each arranged to act upon the base of one of two transistors (3,4) in a darlington connection. One photo diode (6) is adapted to be influenced by low intensity light, whereas the other diode (7) is adapted to be influenced by light of higher intensity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.