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IGCT在整流環(huán)節(jié)中與SCR一脈相承，SCR是Silicon Controlled Rectifier的縮寫，是可控硅整流器的簡稱?？煽毓栌袉蜗?、雙向、可關斷和光控幾種類型。它具有體積小、重量輕、效率高、壽命長、控制方便等優(yōu)點，被廣泛用于可控整流、調(diào)壓、逆變以及無觸點開關等各種自動控制和大功率的電能轉換的場合單向可控硅是一種可控整流電子元件，能在外部控制信號作用下由關斷變?yōu)閷?，但一旦導通，外部信號就無法使其關斷，只能靠去除負載或降低其兩端電壓使其關斷。單向可控硅是由三個PN結PNPN組成的四層三端半導體器件，與具有一個PN結的二極管相比，單向可控硅正向導通受控制極電流控制;與具有兩個PN結的三極管相比，差別在于可控硅對控制極電流沒有放大作用。雙向可控硅具有兩個方向輪流導通、關斷的特性。雙向可控硅實質(zhì)上是兩個反并聯(lián)的單向可控硅，是由NPNPN五層半導體形成四個PN結構成、有三個電極的半導體器件。
IGCT is in line with SCR in the rectification process, which stands for Silicon Controlled Rectifier. There are several types of thyristors, including unidirectional, bidirectional, switchable, and optoelectronic. It has the advantages of small size, light weight, high efficiency, long service life, and convenient control. It is widely used in various automatic control and high-power power conversion scenarios such as controllable rectification, voltage regulation, inverter, and contactless switch. Unidirectional thyristor is a controllable rectification electronic component that can turn off to on under the action of external control signals. However, once it is turned on, the external signal cannot turn it off, and it can only be turned off by removing the load or reducing the voltage at both ends. Unidirectional thyristor is a four layer, three terminal semiconductor device composed of three PN junctions. Compared with diodes with one PN junction, the forward conduction of unidirectional thyristor is controlled by the control pole current; Compared with a transistor with two PN junctions, the difference is that the thyristor has no amplification effect on the control electrode current. Bidirectional thyristor has the characteristic of alternating conduction and turn off in two directions. Bidirectional thyristors are essentially two anti parallel unidirectional thyristors, which are semiconductor devices formed by NPNPN five layer semiconductors with four PN structures and three electrodes.
