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

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

1997-09-23

1999-03-23

Paladini, Albert W.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

323908, 361 58, 395283, 4399241, H02H 902

Patent

active

058864318

ABSTRACT:
This apparatus and method controls and limits the flow of in-rush current to a peripheral device coupled to a main power supply unit through a power bus and a ground bus. The apparatus and method essentially isolate and limit in-rush current flow to a capacitive load until operational current flow occurs to the peripheral device. A switching device is coupled to the power bus and the ground bus through a load. A resistive device is coupled to the power bus and the ground bus through the load. A control circuit is connected to the switching device. During initial start-up or "hot plugging" of the device, the control circuit turns "off" the switching device causing the load to be charged from the power bus through the resistive device until a predetermined condition occurs whereupon the switching circuit is turned "on" to bypass the resistive device and connect the load and the peripheral device to the power bus. Optionally, a uni-directional device may be connected between the power bus and the load to serve as a fail-charge/discharge path to the device in the event the switching device and/or the control circuit should fail. The apparatus and method provide current limiting at power up without requiring the switching component to handle all operational current at all times. Further the apparatus and method allow operation of the device should the switching and/or the control circuit fail.

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