Photocoupling line isolation circuit

Details Photocoupling line isolation circuit Photocoupling line isolation circuit

H - Electricity

03

K

328/114.1

H03K 19/14 (2006.01) H03K 17/16 (2006.01) H03K 17/795 (2006.01)

Patent

CA 1106454

Abstract of the Disclosure The circuit includes a signal input circuit having a light emitting diode that is optically coupled to a phototransistor in a signal output circuit comprising a noise suppression circuit and a Schmitt trigger circuit. The noise suppression circuit comprises a switch portion including a transistor switch and a timing portion including a capacitor. The transistor switch is connected in parallel with the capacitor, and in the quiescent condition of the line isolation circuit, the transistor switch is turned on so as to maintain the capacitor in a discharged condition. When the light emitting diode is illuminated by an input signal exceeding a particular threshold, the phototransistor is turned on, causing the capacitor thereupon commences. The Schmitt trigger circuit is connected to the output of the noise suppression circuit, and if the signal is of sufficient amplitude and duration, the charge on the capacitor reaches the level necessary to operate the Schmitt trigger circuit. Otherwise, the capacitor is discharged by the turning on of the transistor switch responsive to the turning off of the phototransistor.

309939

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