Circuit arrangement for current limiting

Details Circuit arrangement for current limiting Circuit arrangement for current limiting

1986-03-28

1990-09-25

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 87, 323901, 323238, H02H 708

Patent

active

049597477

ABSTRACT:
This invention concerns a circuit arrangement for current limiting for a.c. machines with phase gating control by solid-state devices, aimed at achieving a smooth start by arresting the steady decrease in the ignition angles upon the attainment of a predetermined limiting current value. For use with single-phase measurement of the load current, a circuit is provided for measuring the instantaneous value of the magnitude of the load current, such as a threshold-value detector, which is actuated by a single-phase full-wave rectified load current. The output of this threshold-value detector is applied to a monostable digital device.

REFERENCES:
patent: 3959704 (1976-05-01), McCrea
British Publication, 3MC Module, Digital Three-Phase Induction Motor Controller, by Fairford Electronics, Ltd., 1984.
IEEE Transactions on Industrial Applications, Jan./Feb. 1984; Reduced-Voltage Starting of Squirrel-Cage Induction Motors, by Frank Bruce et al.

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