| 摘要 |
The current (i), the zero crossings of which are to be detected, is supplied to the primary winding (2) of a magnetic core (1) with a rectangular hysteresis curve and a coercive field strength of the order of magnitude of zero. Across the secondary winding (3) of the magnetic core (1), voltage peaks (U) are picked up which are produced with each zero crossing of this current (i). <IMAGE>
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