Thyristor AC Automatic Voltage Control and Regulation Circuit

Published:2011/6/20 21:33:00 Author:Michel | Keyword: Thyristor, AC, Voltage Control and Regulation, Circuit | From:SeekIC

The circuit shown as above uses thyristor AC automatic voltage regulating circuit to stabilize the brightness of projector lamps,L.For this,it accesses thyristor T5 via a diagonal line of communication bridge.And its triggering pulse is generated by single thyristor VT4.Thyristor VT1,VT2 and light activated triode VT3 have the equivalent resistance function.When projection's light changes as the power supply alters,resistance value of light activated triode changes,the voltage phase of the control junction transistor alters.The aboved changes trigger thyristor' pusle phase shift and increasing or reducing thyristor conduction time makes voltage and brightness of the light projection approximately remains unchaged,which stablizes the lightness.



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