ISOLATION_AND_ZERO_VOLTAGE_SWITCHING_LOGIC

Published:2009/7/5 22:33:00 Author:May | From:SeekIC

These two simple circuits provide zero voltage switching. They can be used with full wave bridges or in antiparallel to provide full wave control and are normally used to trigger power thyristors. If an input signal is present during the time the ac voltage is between 0 to 7 V, the SCR will turn on. But, if the ac voltage has risen above this range and the input signal is then applied, the transistor, Q1, will be biased to the on state and will hold the SCR and, consequently, the relay off until the next zero crossing.



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