Major and minor short leakage detector

Details Major and minor short leakage detector Major and minor short leakage detector

1978-05-08

1979-12-04

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 3102

Patent

active

041774205

ABSTRACT:
A short circuit detector for battery powered vehicle circuits has a current lead for connection to the positive battery terminal from which the battery cable has been disconnected, a sensor lead for connection to the disconnected cable, a silicon controlled rectifier and vehicle light bulbs connected across said leads for dissipating high currents caused by a major short, a trigger transistor connected across the leads for turning said rectifier on in response to the current drawn by any short as low as a few milliamperes, a minor short oscillator and a speaker for producing a constant frequency tone that signals a minor short, a major short oscillator for modulating said minor short oscillator causing it to produce a warbling tone that signals a major short, and a discriminator transistor responsive to the amount of current flowing across said leads, for energizing said major short oscillator only in the presence of a major short. In an improved circuit the resistive action of the light bulbs is supplied by a power transistor which is triggered to conduction by a short.

REFERENCES:
patent: 2716216 (1955-08-01), Schwenzfeier
patent: 3157870 (1964-11-01), Marino et al.
patent: 3281677 (1966-10-01), Baggott
patent: 3551796 (1970-12-01), Holder et al.
patent: 3621384 (1971-11-01), Yamada
patent: 3699433 (1972-10-01), Smith
patent: 3870950 (1975-03-01), Laass
patent: 3956697 (1976-05-01), Nery
patent: 4021730 (1977-05-01), Brinegar

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