Triac zero voltage switching

Posted on May 30, 2012

The triac will be gated on at the start of the positive half cycle by current flow through the 3 µf capacitor as long as the C103 SCR is off. The load voltage then charges up the 1 µF capacitor so that the triac will again be energized during the subsequent negative half cycle of line voltage

Triac zero voltage switching
Click here to download the full size of the above Circuit.

A selected gate triac is required because of the III+ triggering mode.

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