Circuit for detecting and indicating faults and operating anomalies in a system for recharging electric accumulators

In a system for recharging electric accumulators, including a three-phase alternator with a three-phase armature winding and a field winding, a rectifier circuit connected to said alternator, and a voltage regulator circuit connected to said rectifier circuit and said alternator field winding,

• a circuit for detecting and indicating faults and operating anomalies, comprising:
• a signal processor circuit connected to said alternator armature winding and operable to provide an output test signal substantially proportional to the mean value of the signal appearing, in operation, at a real or virtual star point of the phases of said armature winding;
• a signal translator circuit connected to said processor circuit and operable to provide a first or "sum" output signal obtained by summing said test signal and a first d.c. signal having a magnitude proportional to the maximum acceptable decrement of said test signal, and a second or "difference" output signal obtained by subtracting from the said test signal a second d.c. signal proportional to the maximum acceptable increment of said test signal;
• signal generator means operable to provide a predetermined reference output signal;
• a comparison circuit connected to said signal translator circuit and said generator means, and operable to provide an output control signal when said "sum" signal falls below said reference signal, and when said "difference" signal exceeds said reference signal, and
• indicator means connected to said comparison circuit and operable to provide an alarm indication when it receives said control signal.