| 摘要 |
The present invention relates to an AC input cell for data acquisition circuits, comprising at least one circuit for detecting a voltage greater than the reference for the positive half-cycle at the input voltage, and a device for detecting a voltage greater than the reference for the negative half-cycle of the input voltage. Each detection circuit comprises a Zener diode, an optocoupler including an emission LED, a diode and a resistor arranged in series. Each detection circuit is arranged on a branch, and the two branches are in parallel with the devices arranged in opposite directions so that the two circuits conduct on alternate half cycles of the input AC signal.
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