| 摘要 |
1. AC input cell intended for data acquisition circuits, particularly in railway applications, comprising at least two lines (A and B) of identical elements arranged the opposite way round on the two lines, the lines are arranged in parallel, each line comprising at least one Zener diode (DZ1 or DZ2), an optocoupler (Ul or U2) comprising an LED diode, a diode (D2 or D4) and a resistor (Rl or R3), each of these elements being arranged in series, wherein the elements of the first line are arranged the opposite way to the direction of the second line elements. 2. AC input cell intended for data acquisition circuits, particularly in railway applications, comprising at least two lines (A and B) of identical elements arranged the opposite way round on the two lines, the lines are arranged in series each line comprising at least one Zener diode (DZ1 or DZ2), an optocoupler (Ul or U2) comprising an LED diode, a diode (D2 or D4) and a resistor (Rl or R3), each of these elements being arranged in series. 3. Cell according to any one of the preceding Claims, characterized in that a resistor (R7 or R13) is arranged in parallel on the LED diode of each of the optocouplers (Ul or U2). 4. Cell according to any one of the preceding Claims, characterized in that, on just one of the lines (A), it comprises a buffer stage with transistor (Ql and R6) inverting the level of the output impedances. |
