Phase_control_circuit_that_uses_a_PUT

Published:2009/7/22 4:11:00 Author:Jessie | From:SeekIC

This circuit shows a PUT that is used to control phase of an SCR. The relaxation oscillator that is formed by Q2 provides conduction control of Q1 from 1 to 7.8 ms (21.6° to 168.5°). This constitutes control of over 97% of the power that is available to the load. Only one SCR is needed to provide phase control of both the positive and negative portion of the sine wave, by putting the SCR across the bridge, which is composed of diodes D1 through D4.



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