| 摘要 |
The invention relates to a circuit arrangement for identifying network zero crossings of the mains voltage (U) of an alternating current network. A measuring current (i, i, i, i, i) generated by the mains voltage (U) is supplied to a zero crossing detector (31, 32) in order to produce a network zero crossing signal, and a current sink (1, Ia, Ib, 11, 12) arranged between the conductor (L) and the earth wire (N) of the alternating current network allows the path of the current value of the measuring current (i, i, i, i, i) generated by the mains voltage to be determined. It is possible, even in the event of failure, to reliably identify the network zero crossings and to keep power loss to a minimum.
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