Driver circuit for light emitting elements connected in series a

Details Driver circuit for light emitting elements connected in series a Driver circuit for light emitting elements connected in series a

1994-04-12

1995-10-17

Allen, Stephone B.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

250214A, 359174, G02F 100

Patent

active

054593280

ABSTRACT:
A driver circuit keeps optical power from other normal light emitting elements, even if either of multiple light emitting elements has disconnection fault. The driver circuit has series connected multiple light emitting elements, which are connected to a constant current power source and a multiple light emitting power control circuits for controlling light emitting power of the corresponding light emitting elements. Each of the light emitting power control circuits has a bypass current control element connected to the corresponding light emitting element in parallel, the light receipt element for detecting light emitting power of light emitting element connected to the bypass current control element, a current control circuit for controlling current flowing through the bypass current control element in accordance with the light receipt level and the voltage detecting circuit for making larger the current flowing to the bypass current control element, when a value between terminals of the corresponding light emitting element is detected, and it becomes the fixed voltage value or above.

REFERENCES:
patent: 4886334 (1989-12-01), Aoki
patent: 5274496 (1993-12-01), Fujiwara et al.
patent: 5383046 (1995-01-01), Tomofuji et al.

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