System for protecting the rectifier bridge of a motor vehicle alternator against load-shedding overvoltage

摘要

The invention relates to a system for protecting the rectifier bridge of an alternator for an automobile. The system comprises: - a circuit 1 for detecting the on time of the recirculation diode DR connected to the terminals thereof. It delivers a signal stcd representing the duration of the on time of the recirculation diode during load-shedding; - a circuit 2 for reducing the thermal energy accumulated on abrupt or repetitive load-shedding by diodes of the rectifier bridge PR is provided in order to afford a reduction in the excitation current Iex of the field winding LI of the alternator by way of the regulator REG. Applications to alternators for heavy goods vehicles of diesel type or for private motor vehicles. IMAGE