Protective circuit for a semiconductor laser

Details Protective circuit for a semiconductor laser Protective circuit for a semiconductor laser

1984-08-06

1989-10-03

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 98, H02H 902

Patent

active

048720801

ABSTRACT:
A protective circuit for a semiconductor laser supplied with an excitation current by a current generator circuit is created using a transducer, whose output is controlled by the laser light, a limit circuit cooperating with the transducer and a current shunt circuit energized by the limit circuit and switched in parallel with the semiconductor laser. Once the permissible emitted light power is reached, excessive excitation current is diverted to the shunt circuit. Exemplary embodiments of the invention are found to achieve response times below 20 ns and are able to protect the semiconductor laser from overload currents even during power-on and power off.

REFERENCES:
patent: 3483428 (1969-12-01), LaPlante
patent: 3626249 (1971-12-01), Snedeker
patent: 3691426 (1972-09-01), Mankovitz
patent: 3873905 (1975-03-01), Marek
patent: 4074334 (1978-02-01), D'Arrigo et al.
patent: 4162398 (1979-07-01), Kayanuma
patent: 4186418 (1980-01-01), Seiler
patent: 4507767 (1985-03-01), Takasugi
Electronics, vol. 54, No. 1, Jan. 13, 1981, pp. 173-175, Kularatna, A.D.V.N., "Optosensor Limits Shoot Supply's No Load Current".

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