Light sensitive switching circuit

Details Light sensitive switching circuit Light sensitive switching circuit

1985-08-27

1988-03-22

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307311, 307632, 250214R, 250214AL, 250206, 315158, 315159, H01H 3500, H03K 342, H01J 4014

Patent

active

047331038

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.

REFERENCES:
patent: 3088051 (1963-04-01), Scanlon
patent: 3294974 (1966-12-01), Riebs
patent: 3584222 (1971-06-01), Nesbitt
patent: 3676685 (1972-07-01), Myer
patent: 3821565 (1974-06-01), Horinaga
patent: 3900763 (1975-08-01), Turner
patent: 3962600 (1976-06-01), Pittman
patent: 4330706 (1982-05-01), Lawenhaupt

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