| 摘要 |
A device Ueb for protecting an electrical network supplied by a controllable voltage source Gen, against excess voltages, short-circuits the excitation system Ew of the voltage source by means such as thyristor Th to reduce the output voltage, and removes the short circuit after a period of time determined by a multivibrator MK which charges a capacitor C. The voltage on C turns on Tr to turn off Th. A device of this kind is particularly suitable for motor vehicle electrical systems having a three-phase alternator. Zener DI senses the overvoltage. <IMAGE> |
