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    • 11. 发明授权
    • Gate turn-off thyristor
    • 门极关断晶闸管
    • US4825270A
    • 1989-04-25
    • US009479
    • 1987-02-02
    • Yukimasa SatouTsutomu YatsuoSaburo OikawaIsamu Sanpei
    • Yukimasa SatouTsutomu YatsuoSaburo OikawaIsamu Sanpei
    • H01L29/10H01L29/74H01L29/744
    • H01L29/744H01L29/102H01L29/7428
    • The present invention relates to a buried gate type gate turn-off thyristor. A low-resistance layer which is buried in a cathode base layer has a multiplicity of small bores below a cathode emitter layer. The distance between each pair of adjacent small bores and the thickness of the low-resistance layer are each set so as to be smaller than the carrier diffusion length in an anode base layer. In an on-state, carries flow through the low-resistance layer, thereby allowing the low-resistance layer to become conductive, and thus lowering the on-state voltage. A reduction in the dimension of the small bores lowers the resistance of the low-resistance layer and hence lowers the gate drawing out resistance, so that the interrupting capacity is improved. When gate turn-off thyristor is arranged so as to have an amplifying gate structure, the distance between each pair of adjacent small bores in the amplifying auxiliary thyristor section is set so as to be greater than the carrier diffusion length in the anode base layer. In consequence, the on-state voltage in the auxiliary thyristor section is increased, so that the current selectively flows through the main thyristor section, and the auxiliary thyristor section automatically turns off. Accordingly, when the thyristor is to be turned off, it suffices to turn off the main thyristor section alone.
    • 本发明涉及一种埋栅式栅极截止晶闸管。 埋在阴极基底层中的低电阻层在阴极发射极层下方具有多个小孔。 每对相邻的小孔之间的距离和低电阻层的厚度各自设定为小于阳极基底层中的载流子扩散长度。 在导通状态下,通过低电阻层流动,从而使低电阻层变得导电,从而降低导通电压。 小孔的尺寸的减小降低了低电阻层的电阻,从而降低了栅极拉出电阻,从而提高了中断能力。 当栅极截止晶闸管被布置成具有放大栅极结构时,放大辅助晶闸管部分中每对相邻的小孔之间的距离被设定为大于阳极基极层中的载流子扩散长度。 因此,辅助晶闸管部分中的导通电压增加,使得电流选择性地流过主晶闸管部分,并且辅助晶闸管部分自动关闭。 因此,当晶闸管关断时,只需断开主晶闸管部分即可。