Two kinds of thyristor single-directional thyristor and two-way controllable silicon. Bidirectional thyristor is also called three-way two-way thyristor, referred to as Triac. Bidirectional thyristor is equivalent to two one-way thyristor reverse direction, which has two-way telephoto functions. Its peas is determined by the control pole G. Adding a positive pulse (or negative pulse) on the control pole G can be turned on forward (or reverse). The advantage of this device is that the control circuit is simple, there is no reverse tolerance problem, so it is particularly suitable for use with the communication without contact switch.

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