Optically coupled solid state relay with dual discharging circui

Details Optically coupled solid state relay with dual discharging circui Optically coupled solid state relay with dual discharging circui

1990-06-18

1991-09-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

307311, G02B 2700

Patent

active

050457098

ABSTRACT:
For preventing an optically coupled solid state relay with normally-open output terminals and normally-closed output terminals from undesirable concurrent on-state, the solid state relay comprises first and second photodiode arrays producing first and second photocurrents in the presence of an optical radiation produced in a light-emitting diode, an enhancement mode transistor coupled to the first photodiode array and controlling the normally-open output terminals, a depletion mode transistor coupled to the second photodiode array an controlling the normally-closed output terminals, and first and second discharging circuits for short circuiting the enhancement mode transistor and the depletion mode transistor in the absence of the optical radiation, respectively, in which the amount of the second photocurrent is larger than that of the first photocurrent and the enhancement mode transistor is larger in the absolute value of a threshold level than the depletion mode transistor, and in which the first discharging circuit extinguishes the residual charges faster than the second discharging circuit.

REFERENCES:
patent: 4390790 (1983-06-01), Rodriquez
patent: 4419586 (1983-12-01), Phipps

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