Low voltage alternator having short circuit protection

Details Low voltage alternator having short circuit protection Low voltage alternator having short circuit protection

1983-07-21

1986-02-11

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Generator protective circuits

361 18, 361 94, 361 98, 322 24, 322 27, 322 68, H02H 706

Patent

active

045701989

ABSTRACT:
In case of short circuit the overcurrent which passes through a detecting resistance in series with the excitation winding of the alternator operates a threshold current generator, which reduces the voltage of the central node of a voltage divider. A trigger interposed between said central node and an actuator circuit (for example a Darlington circuit) placed in series with the excitation winding of the alternator and with the above mentioned resistance turns off said actuator circuit, thus interrupting the current passage through the excitation winding. A filtering condenser associated to the voltage divider restores with delay the initial condition. The cycle is periodically repeated until the short circuit condition remains.

REFERENCES:
patent: 3426265 (1969-02-01), Till
patent: 3432726 (1969-03-01), Meyer et al.
patent: 3527997 (1970-09-01), Nercessian
patent: 3753079 (1973-08-01), Trilling
patent: 3796943 (1974-03-01), Nelson et al.
patent: 3940572 (1976-02-01), Burgess
patent: 3983471 (1976-09-01), Itoh et al.
patent: 4013925 (1977-03-01), Tice et al.
patent: 4306184 (1981-12-01), Iwaki et al.
patent: 4338646 (1982-07-01), Davis et al.
patent: 4401937 (1983-08-01), Morishita

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