ZERO_CROSSING_PULSES

Published:2009/7/16 1:04:00 Author:Jessie | From:SeekIC

Sharp pulse is pro duced ct each zero crossing, for phase con trol of scr power supply. When instantaneous line voltage is zero, differential amplifier Q1-Q2 is balanced and collectors swing to +2.5 v, causing gate to produce 2-v, 20-microsec output pulse.-S. Prigozy, Zero. Crossing Detector Provides Fast Sync Pulses, Electronics, 38:8 p 91.



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