| 摘要 |
The present invention relates to a method and circuit for protecting a field effect transistor unit (1) used as a switch from a transient surge. According to the invention, the voltage (UF) over the field effect transistor unit (1) is monitored by means of a voltage monitoring unit (3) especially when the field effect transistor unit (1) is in non-conducting state, and when the voltage (UF) over the field effect transistor unit (1) exceeds a preset threshold value, the field effect transistor unit (1) is switched into conducting state by means of a voltage lowering unit (4), whereby the transient surge is caused to flow through a conducting field effect transistor unit (1). |
