Apparatus for identifying faulty diodes in automotive alternator

Details Apparatus for identifying faulty diodes in automotive alternator Apparatus for identifying faulty diodes in automotive alternator

1977-06-06

1979-05-29

Rolinec, Rudolph V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

324 15, 324158MG, G01R 3122, G01R 3102

Patent

active

041568451

ABSTRACT:
Faulty alternator diodes are identified by detection of a voltage ripple across the terminals of the automotive storage battery. A diode is forward biased whenever the battery has adequate charge to be designated a "good battery", and the forward bias condition is utilized as a reference potential. A voltage divider scales the reference potential, and couples it to the inverting terminal of a comparator. The non-inverting terminal is biased at a predetermined differential from the inverting terminal, and the probe signal is AC coupled to the non-inverting terminal. If a diode is bad, the superposition of the AC with the bias will switch the comparator and energize a light emitting diode.

REFERENCES:
patent: 3629704 (1971-12-01), Stevens
patent: 4019120 (1977-04-01), Fattic

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