Lamp control and lamp switch circuit for controlling light balan

Details Lamp control and lamp switch circuit for controlling light balan Lamp control and lamp switch circuit for controlling light balan

1975-04-17

1976-04-13

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250227, 315149, G01J 132

Patent

active

039506401

ABSTRACT:
Control and switching circuits for maintaining appropriate balance of light output of a long multi-vapor arc lamp. The control circuit includes sensing, amplifier-reference, phase amplitude detector, time base generator and lamp switching logic branches. The switching circuit includes a silicon controlled rectifier bridge for reversing the polarity of current flow through the lamp. The silicon controlled rectifier bridge is triggered by output pulse chains from the lamp switching logic branch in the control circuit.

REFERENCES:
patent: 3558892 (1971-01-01), Seeley
patent: 3590259 (1971-06-01), Johnston
patent: 3796866 (1974-03-01), McClellan

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