High sensitivity control circuit for optical solid-state relays

Radiant energy – Photocells; circuits and apparatus – Signal isolator

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Details

250214LS, 307117, G02B 2700

Patent

active

055324983

ABSTRACT:
A high sensitivity control circuit for a solid-state relay is disclosed for use in optically coupled solid state relay circuits having a light emitting diode. The control circuit reduces a loading effect of the turn-off circuit on a photodiode array allowing the photodiode array to operate the switching transistor to switch an input signal to a switching contact. A two stage CMOS transistor circuit acting as an amplifier is employed for high-speed switching. Deactivation of the light emitting diode reverse biases a sense photodiode to discharge the switching transistor to prevent switching of the input signal to the switching contact.

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