Thyristor_control_with_line_voltage_compensation

Published:2009/7/22 1:44:00 Author:Jessie | From:SeekIC

This circuit shows a UJT used as a trigger, where the thyristor must provide a constant output voltage, regardless of line-voltage changes. As line voltage increases, the voltage on the wiper of P1 increases (as does the UJT peak voltage), which increases the CT charge. With a higher charge on CT, the circuit takes more time to trigger, reduces the thyristor conduction angle and maintains the average voltage at a reasonably constant value.



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