Current regulation system for three-phase load

Details Current regulation system for three-phase load Current regulation system for three-phase load

1976-01-28

1977-11-08

Goldberg, Gerald

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

323 9, 361 31, H02H 308, G05F 144

Patent

active

040578429

ABSTRACT:
The load currents, supplied by a three-phase AC power source to a three-phase load, are established and maintained at a preset desired level by sensing those currents and producing a feedback voltage which is compared with a reference potential. Anytime the load currents differ from the desired level the comparison produces a difference or error signal which causes an adjustment of the amplitudes of the three load currents such that they automatically return to the desired level, thereby regulating the current flow to the load. At start-up, the feedback arrangement is also effective in preventing instant current build-up to avoid sudden power surges. When the load is a three-phase motor, limiting the current flow facilitates a soft start with the motor gradually accelerating to full operating speed. Two overload protection circuits shut the system down in response to different overload or overcurrent conditions. One operates when the peak-to-average ratio of the load currents is higher than normal, and the other protection circuit actuates when the peak current is higher than desired.

REFERENCES:
patent: 3176215 (1965-03-01), Kusko
patent: 3387205 (1968-06-01), Tesdall
patent: 3611043 (1971-10-01), Steen
patent: 3633073 (1972-01-01), Day et al.
patent: 3743921 (1973-07-01), Legg et al.
patent: 3800189 (1974-03-01), Montz
IBM Tech. Disc. Bulletin vol. 18, No. 3, Aug. 75, pp. 798,799 "DC Current Sense Ckt. for AC-DC Converters" by G. C. Johari.

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