Light indicating system having light emitting diodes and power r

Details Light indicating system having light emitting diodes and power r Light indicating system having light emitting diodes and power r

1977-10-14

1980-07-08

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Discharge control discharge device in the supply circuit

315199, 315312, 315DIG4, 323 22SC, 340333, 340782, H05B 4300, H05B 41392

Patent

active

042119561

ABSTRACT:
A light indicating monitoring system includes a plurality of light emitting diodes (LED's) having a common ground connected to a phase controlled silicon controlled rectifier (SCR) circuit. The SCR circuit limits conduction of rectified AC energy through the LED's and through corresponding resistors connected in series with the LED's for limiting the current through the LED's. The SCR circuit thereby provides for operating low DC voltage LED's from a high AC voltage source with a minimum of power and heat generation in the current limiting resistors.

REFERENCES:
patent: 3454865 (1969-07-01), Ellert
patent: 3813664 (1974-05-01), Geyer

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