Apparatus for identifying faulty diodes in automotive...

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

G - Physics

01

R

324/14

G01R 31/02 (2006.01) G01R 31/00 (2006.01) G01R 31/34 (2006.01) G01R 31/40 (2006.01)

Patent

CA 1098171

ABSTRACT OF THE INVENTION 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 en- ergize a light emitting diode.

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