Direct current inrush limiting circuit

Details Direct current inrush limiting circuit Direct current inrush limiting circuit

1982-10-25

1985-01-15

Shoop, William M.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323282, 323303, 323908, G05F 144

Patent

active

044940645

ABSTRACT:
Direct current inrush upon connection of a capacitive load to a d.c. voltage is limited through an intermediary circuit. Within such circuit the inrush current is sensed by a series resistance and such sensing is utilized via a feedback loop, to control a series current regulating transistor to be cyclically conducting or non-conducting of a first direct current path. A second direct current path through freewheeling diodes flows current to the load only when such series current regulating transistor is non-conducting of such first path current. After fully charging the capacitive load, howsoever slowly as desired, the first current path conducts with low power dissipation while the second current path is non-conducting. The circuit is further controlled to be correctly operative for control of inrush current during the turn-on, or disruption of, fundamental power to such circuit.

REFERENCES:
patent: 3733540 (1973-05-01), Hawkins
patent: 3959714 (1976-05-01), Mihelich
patent: 4195335 (1980-03-01), Murakami et al.
patent: 4307440 (1981-12-01), Inoue et al.
IBM Technical Disclosure Bulletin, "Power Supply Output Over-Current Protection", M. Dye and P. J. Murset, vol. 24, No. 5, Oct. 1981, p. 2435.

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