Electronic circuit breaker

Details Electronic circuit breaker Electronic circuit breaker

1977-07-06

1979-04-03

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

323 9, 361101, 363 50, 363 55, H02H 308

Patent

active

041480880

ABSTRACT:
An electronic circuit breaker feeding a d-c/d-c converter from a power supply common to several such converters includes a normally saturated main or switching transistor T.sub.1 in series with the associated converter, the latter having an output from which auxiliary voltage is fed back to an ancillary transistor T.sub.2 lying in series with a voltage divider R.sub.1, R.sub.2 serving to bias the main transistor into conduction. A further transistor T.sub.3 triggers the cutoff of the main transistor T.sub.1 when the converter draws excess current, part of which flows through the voltage divider R.sub.1, R.sub.2. Another voltage divider R.sub.4 R.sub.5 in parallel with the first-mentioned divider biases the further transistor T.sub.3 and is thus traversed by a portion of the feedback current passing through the ancillary transistor T.sub.2, being therefore likewise cut off upon de-energization of the converter by the cessation of conduction through the main transistor. Restoration of normal conditions is possible by the temporary opening of a switch in series with the converter input whereby a capacitor C.sub.1 connected across the output of the ancillary transistor T.sub.2 is discharged so that reclosure of the switch starts a current flow through the two voltage dividers; a shunt capacitor C.sub.2 connected across the input of the trigger transistor T.sub.3 delays its conduction so that the switching transistor T.sub.1 again saturates as the converter is re-energized.

REFERENCES:
patent: 3386005 (1968-05-01), Roland et al.
patent: 3571662 (1971-03-01), Jenson
patent: 3697857 (1972-10-01), El-Banna
patent: 3729671 (1973-04-01), Jeffery et al.

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