Re-regulation circuit for automobile tachometer detection circuit
First Claim
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1. A re-regulation circuit as for use with a vehicle alternator/charging system and comprising:
- regulator means for producing a first control signal for controlling the excitation current of said alternator;
first detection means coupled to said alternator/charging system for detecting that the output of said alternator is lower than a predetermined level;
first logic means coupled to the first detection means for providing a second control signal in response to said detection for controlling the excitation current of said alternator;
fault detection means coupled to said alternator/charging system for providing a fault signal in response to detection of an actual fault in said system;
second logic means coupled to the first logic means and the fault detection means for disenabling said second control signal in response to said fault signal; and
means coupling said second control signal to the regulator whereby the second control signal is combined with the first control signal.
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Abstract
A re-regulation circuit operates in the environment of a vehicle alternator/charging system and cooperates with the standard regulator to prevent momentary loss of load from reducing the field excitation to such an extent that the alternator AC output is too low for proper functioning of such AC-dependent circuits as the tachometer circuit. Re-regulation is prohibited in the event of a true fault in the system. The temporary condition is not indicated to the user as a true fault.
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Citations
9 Claims
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1. A re-regulation circuit as for use with a vehicle alternator/charging system and comprising:
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regulator means for producing a first control signal for controlling the excitation current of said alternator; first detection means coupled to said alternator/charging system for detecting that the output of said alternator is lower than a predetermined level; first logic means coupled to the first detection means for providing a second control signal in response to said detection for controlling the excitation current of said alternator; fault detection means coupled to said alternator/charging system for providing a fault signal in response to detection of an actual fault in said system; second logic means coupled to the first logic means and the fault detection means for disenabling said second control signal in response to said fault signal; and means coupling said second control signal to the regulator whereby the second control signal is combined with the first control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification