| 摘要 |
PURPOSE:To enable the control of an alternating current bidirectionally with a positive gate signal of an ordinary magnitude by superposing the emitter layer at the gate electrode side of one main surface of a 5-layer triac on the emitter layer of the other main surface by the prescribed width. CONSTITUTION:The emitter electrode 4 at the gate electrode 5 side of an emitter electrode 8 at one main surface 2 side of a 5-layer triac and the emitter layer 6 of the other main surface side are superposed in the prescribed width L longer than twice the width Wn of the central base 1 in a planar manner. When the N-type emitters are thus disposed, holes injected from a P2 layer are stored as excessive carriers on an N1 layer in a mode with T1 electrode as (+), T1 electrode as (-) and G electrode as (+), the potential of the P1 layer is raised, the T1 electrode is forwardly biased, electrons from the N1 layer are accelerated in injection, and are turned ON. Thus, the alternating current can be controlled bidirectionally with positive gate signal of the ordinary magnitude. |
