Circuit and method of operation to control in-rush current and m

Details Circuit and method of operation to control in-rush current and m Circuit and method of operation to control in-rush current and m

1998-08-05

1999-10-26

Paladini, Albert W.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

323908, 361 58, 395283, 4399241, H02H 902

Patent

active

059734191

ABSTRACT:
This apparatus and method controls and limits the flow of in-rush current and maintains a supply voltage to a peripheral device during power surges. The apparatus and method essentially isolate and limit in-rush current flow to an in-rush circuit comprising a capacitive load and series resistor connected directly to the power bus at one end and to a reference potential at the other end. A switching device is coupled to the series resistor. A current sensing circuit is coupled to the series resistor. During initial start-up or "hot plugging" of the device, a control circuit turns "off" the switching device causing the load to be charged from the power bus through the resistive device for a pre-selected time interval, after which the switching circuit is turned "on" to bypass the resistive device and connect the load and the peripheral device to the power bus. The current sensing circuit detects when current flow is out of the load at which time the sensing circuit send a discharge signal to turn on the switching circuit and bypass the resistor which maintains the supply voltage of the device during the power surge.

REFERENCES:
patent: 5087871 (1992-02-01), Losel
patent: 5383081 (1995-01-01), Nishikawa
patent: 5432916 (1995-07-01), Hahn et al.
patent: 5572395 (1996-11-01), Rasums et al.
patent: 5675467 (1997-10-01), Nishimura et al.

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