Constant-current circuit for light-emitting element

Details Constant-current circuit for light-emitting element Constant-current circuit for light-emitting element

1991-10-17

1994-08-23

Voeltz, Emanuel T.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323902, 359174, G05F 156

Patent

active

053410866

ABSTRACT:
A constant-current circuit includes a circuit current source for generating a circuit current necessary for the constant-current circuit, and a light-emitting element current source for passing a first current which is part of the circuit current through a light-emitting element in response to an input signal. A current control circuit detects a change in the first current and generates a control signal based on the change in the first current. A controlled current source passes a second current which is part of the circuit current and changes the amount of the second current on the basis of the control signal so that the circuit current has a fixed amount.

REFERENCES:
patent: 4011557 (1977-03-01), Chetelat et al.
patent: 4017847 (1977-04-01), Burford et al.

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