SIGNAL DETECTOR Russian patent published in 1994 - IPC

FIELD: automatic control. SUBSTANCE: device has three-wire communication line, thyristor 5, selecting units 4₁-4_n, each having resistor 6, diode 7, resistor 8, capacitor 9, optocoupler 10. Detector operates as follows: supplying clock pulse over wires 1, 2 of communication line and passing current through third line 3 of communication line turns on thyristor and charges capacitor 9₁. Optocoupler 10₂ of second unit 4₂ is OFF since photodiode 10₁ is not excited. Upon arrival of next clock pulse over wires 1, 2, while circuit of gate electrode is de-energized, optocoupler 10₂ is driven in conduction and capacitor 9₂ charges. Length of clock pulse is selected to be sufficient for charging capacitor 9 of conducting unit 4 and discharging capacitor 9 of preceding unit 4 and length of space is comparable with OFF-time of optocouplers 10₁-10_n. EFFECT: improved reliability. 1 dwg