《A High Power Light Triggered Triac with a novel light senstive structure》.pdf

IEEE TRANSACTIONS ON ELECTRON DEVICES, VOL. 42, NO. 4, APRIL 1995 113 A High Power Light Triggered Triac with a Novel Light Sensitive Structure Shan-Qi Zhao, Zheng-Yuan Wang, Member, IEEE, and Ding-San Gao 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 A 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/ps, and the commutating dildt capability of 50 Alps. I. INTRODUCTION LIGHT triggered triac (Lnriac), a new type of power Asemiconductor device, consists of two thyristors effec- tively connected in inverse parallel and GaAs light emitting diode (LED) put between the thyristors. They are optically coupled so that either thyristor can be triggered