Abstract
A high power light triggered triac with novel gate structure is presented, which consists of two thyristors connected in inverse parallel and one light emitting diode provided over a cone-shaped groove light sensitive gate between the thyristors. The light trigger characteristics have been studied, and some manufacturing techniques are also described. A 500-A, 1200-V, 40-mm diameter light triggered triac has been developed. This device has the characteristics of the minimum light triggering power of less than 15 mw, the on-state voltage of less than 1.6 V, the commutating dV/dt capability of 100 V//spl mu/s, and the commutating di/dt capability of 50 A//spl mu/s.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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