Light sensitive switching circuit
US4733103A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1985 |
| Grant date | Mar 22, 1988 |
| Priority date | — |
| Expiry date | Aug 27, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/40
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A light sensitive switching circuit for automatically controlling the supply of electric power from a power source to a load, such as a lantern, is disclosed. When it becomes darker than a predetermined brightness the power supply starts and when it becomes bright again, the power supply is cut. The light sensitive switching circuit comprises first and second lines for connecting the power source and the load in series between the first and second lines. A first thyristor is connected between the first and second lines, and a second thyristor connected is to the first thyristor such that the anode of the second thyristor is connected to the gate of the first thyristor and the cathode of the second thyristor is connected to the cathode of the first thyristor. A photocell is connected between the gate and the cathode of the second thyristor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.