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Triac zero voltage switching

2015-09-17 02:19  
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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

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

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