Photoelectric control unit with cooling chamber

Details Photoelectric control unit with cooling chamber Photoelectric control unit with cooling chamber

1986-09-04

1988-12-13

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Housings

250214AL, 439487, 174 522, H01J 562

Patent

active

047912901

ABSTRACT:
A photoelectric control unit for street lighting comprises control means including a photoelectric sensor mounted on a printed circuit board for switching on a street lamp when the intensity of light falling on the sensor falls below a preset value. Electrical connection means between the P.C.B. and the lamp is provided by three connector pins which are led through a cooling chamber or stem. The pins are cranked to closely follow the contour of the chamber to dissipate heat through the chamber walls. The chamber is also filled with a high thermal conductivity potting compound for heat transfer to the walls of the chamber.
One controller for such a photoelectric control unit includes a switching means provided by a relay and a triac connected in parallel. The triac operates to prevent the relay being subjected to high voltages during switching and hence prevents pitting of the relay contacts.

REFERENCES:
patent: 2709224 (1955-05-01), Garnick
patent: 3163768 (1964-12-01), Bernheim
patent: 3402383 (1968-09-01), Hilzen
patent: 4023035 (1977-05-01), Rodriguez

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