Circuit for detecting and indicating faults and operating anomalies in a system for recharging electric accumulators
First Claim
1. 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 signal value present, in operation, at a real or virtual star point of the phases of said armature winding;
generator means operable to provide first and second predetermined stabilised reference output signals representing, respectively, a minimum and a maximum acceptable value of said test signal and which are substantially independent of the voltage appearing at said rectifier circuit output;
a comparison circuit connected to said signal processor circuit and said generator means, and operable to provide an output control signal when said test signal falls below said first reference signal, and when said test signal exceeds said second reference signal and,indicator means connected to said comparison circuit and operable to provide an alarm indication when it receives said control signal.
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Accused Products
Abstract
In a system for recharging electric accumulators, including a polyphase alternator connected to a rectifier circuit, and a voltage regulator circuit connected to the rectifier circuit and the field winding of the alternator, there is connected a circuit for detecting and indicating faults and operating anomalies. This circuit includes a signal processor circuit which is connected to the armature winding of the alternator and is operable to provide an output test signal substantially proportional to the mean value of the signal appearing, in operation, at the actual or virtual star point of the phases of the armature winding of the alternator. Generator means provide first and second predetermined reference output signals. A comparison circuit activates alarm signalling means when the test signal falls below the first reference signal, and when the test signal exceeds the second reference signal.
195 Citations
20 Claims
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1. 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 signal value present, in operation, at a real or virtual star point of the phases of said armature winding; generator means operable to provide first and second predetermined stabilised reference output signals representing, respectively, a minimum and a maximum acceptable value of said test signal and which are substantially independent of the voltage appearing at said rectifier circuit output; a comparison circuit connected to said signal processor circuit and said generator means, and operable to provide an output control signal when said test signal falls below said first reference signal, and when said test signal exceeds said second reference signal and, indicator means connected to said comparison circuit and operable to provide an alarm indication when it receives said control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. 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. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification