公开(公告)号：US5534735A

公开(公告)日：1996-07-09

申请号：US272530

申请日：1994-07-11

申请人： Akira Baba ,  Kazuo Sugimura ,  Satoshi Miwa ,  Keizo Yamamoto ,  Masayuki Saito

发明人： Akira Baba ,  Kazuo Sugimura ,  Satoshi Miwa ,  Keizo Yamamoto ,  Masayuki Saito

IPC分类号： H03K17/08 ,  H03K17/082 ,  H03K17/73 ,  H03K17/78 ,  H03K17/79 ,  H01H47/24

CPC分类号： H03K17/0824 ,  H03K17/79 ,  Y10T307/773

摘要： A photo SI thyristor driving circuit which has a good switching characteristic suitable to be used for a photo relay, and a protection circuit therefor for protecting a photo SI thyristor element from being broken down due to a thermal runaway. The photo SI thyristor driving circuit comprises a photo SI thyristor, a MOS transistor provided in a gate circuit of the photo SI thyristor to draw charges accumulated at the gate of the photo SI thyristor when the photo SI thyristor is turned off, and a plurality of photo electromotive force elements provided in a gate circuit of the MOS transistor to generate a photo current for biasing the MOS transistor. The protection circuit includes a snubber circuit connected between the anode and the cathode of the photo SI thyristor and a light emitting element for irradiating light to the photo electromotive elements in response to an output from the snubber circuit.

摘要翻译： 一种具有适合用于光电继电器的良好开关特性的照相SI晶闸管驱动电路，以及用于保护照片SI晶闸管元件由于热失控而被分解的保护电路。 照片SI晶闸管驱动电路包括光闸晶闸管，MOS晶体管，其设置在光闸晶闸管的栅极电路中，以在光闸晶闸管截止时吸收在光SI晶闸管的栅极处累积的电荷;以及多个 设置在MOS晶体管的栅极电路中以产生用于偏置MOS晶体管的光电流的光电动势元件。 保护电路包括连接在光SI晶闸管的阳极和阴极之间的缓冲电路和用于响应于缓冲电路的输出向光电元件照射光的发光元件。