Conversion circuit for limiting inrush current

Details Conversion circuit for limiting inrush current Conversion circuit for limiting inrush current

1988-07-07

1989-09-05

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

363 15, 363 26, H02M 544

Patent

active

048644820

ABSTRACT:
A conversion circuit is provided which includes a negative temperature coefficient resistance between a rectifier and a storage capacitor to limit inrush current when power is applied to the circuit after a power interruption of a relatively long duration. When power is resumed after a short term power interruption and the resistance of the negative temperature coefficient resistance is still low, inrush current is limited by disconnecting a load from the conversion circuit immediately upon the occurrence of the power interruption to maintain the charge on the storage capacitor for the duration of the interruption. A boost regulator unit is provied between the negative temperature coefficient resistance and the storage capacitor to provide a regulated direct current potential across the capacitor which is not responsive to input power variations.

REFERENCES:
patent: 3569817 (1971-03-01), Boehringer
patent: 3736496 (1973-05-01), Lachocki
patent: 3913000 (1975-10-01), Cardwell
patent: 4160288 (1979-07-01), Stuart et al.
patent: 4245285 (1981-01-01), Weiss
patent: 4510400 (1985-04-01), Kiteley
patent: 4533986 (1985-08-01), Jones
patent: 4620271 (1986-10-01), Musil
patent: 4742535 (1988-05-01), Hino et al.
patent: 4743835 (1988-05-01), Bosse et al.

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