Zero Volt Switch Circuit

Published:2011/7/21 21:21:00 Author:Joyce | Keyword: zero volt , switch | From:SeekIC

As shown in the figure, the zero volt switch circuit will produce trigger impulse when ac voltage passes zero. In order to achieve it, 555 is connected in the form of a comparator, and corresponding static offset voltage 0.7 ~ 1 V is set on the controlling end feet 5 .A LED is used as comparing device , as well as indication of the existence of the reference voltage . The oscillogram of working process is as shown in figure (b). Here, to illustrate the problem, sine wave is drawn as triangle wave, but analysis of the process will not be influenced.



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