Control circuit for light emitting diode

Details Control circuit for light emitting diode Control circuit for light emitting diode

1982-02-08

1983-09-06

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307299B, 307311, H03F 345, H03F 3345, H03L 500

Patent

active

044031572

ABSTRACT:
A circuit for controlling one or more light emitting diodes is disclosed. The circuit is designed to supply current to the diodes from an input voltage source in response to a control signal. The circuit provides a predetermined level of current to the diodes which is substantially independent of the magnitude of the input voltage. The circuit also includes a switching function which operates to switch off the diode current when the control signal exceeds a first level of control voltage. When the control signal is reduced below a second level of control voltage, the diode current is switched to the predetermined level of current.

REFERENCES:
patent: 3700921 (1972-10-01), Gay
patent: 3902806 (1975-09-01), Bober
patent: 3911268 (1975-10-01), Mori et al.
patent: 3922570 (1975-11-01), Eguchi et al.
patent: 4160934 (1979-07-01), Kirsch
patent: 4258276 (1981-03-01), Beling

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