The circuit utilizes combinational logic and latching circuits to prevent damage to the regulator or to the battery of an automotive ignition system due to a serious fault such as the ignition being turned "on" but the engine/alternator not rotating. A fixed duty cycle control signal is added to the...http://www.google.fr/patents/US4670705?utm_source=gb-gplus-shareBrevet US4670705 - Alternator regulator protection circuit
