公开(公告)号：US5229907A

公开(公告)日：1993-07-20

申请号：US536886

申请日：1990-06-13

申请人： Marco Morelli ,  Fabio Marchio ,  Bruno Cavalli

发明人： Marco Morelli ,  Fabio Marchio ,  Bruno Cavalli

IPC分类号： H01L27/04 ,  G05F1/10 ,  H01L21/822 ,  H01L27/06 ,  H02H3/20 ,  H02H9/04

CPC分类号： H02H9/046 ,  H02H9/041

摘要： The device for protection comprises a zener diode voltage limiter having a breakdown voltage pre-set at a value (say, 30 volts) lower than the maximum value sustainable by the protected circuit in the closed condition and a quenching circuit having a pre-set lag controlled by each overvoltage impulse and suitable for disactivating said voltage limiter and to control the opening of said protected circuit with a time lag pre-set with respect to the start of each overvoltage impulse. In succession to said voltage limiter there is introduced in addition a zener diode with a higher breakdown voltage, say, equal to 110 volts, which allows the limitation to such a value of any overvoltages having a very low energy content superimposed over overvoltages having limited amplitude and long duration.