Power switch circuit providing linear voltage rise

Details Power switch circuit providing linear voltage rise Power switch circuit providing linear voltage rise

1993-09-24

1994-12-27

Sikes, William L.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Signal transmission integrity or spurious noise override

327111, 327427, H03K 1700, H03L 500

Patent

active

053768310

ABSTRACT:
A switch circuit controllably supplies initial current from a power supply to a load to prevent a current surge when the switch circuit is "hot-plugged" or when power is first applied to the switch circuit. The circuit comprises an output transistor having a first port for connection to a load, a second port for connection to the power supply and a third port for on/off control. A first resistor is connected between the second and third ports. A second resistor and a first capacitor are connected in series with each other between the first and third ports. The second resistor is large enough such that the transistor is biased off when the power supply is first connected to the second port. A timer changes the voltage at the third port a predetermined time after application of the power supply to the second port so as to bias the output transistor to begin a limited conduction of current between the first and second ports. This current increases in a controlled manner as the capacitor discharges until the output transistor is turned-on fully to supply operating current.

REFERENCES:
patent: 4876463 (1989-10-01), Lyle
patent: 4877982 (1989-10-01), Walker
patent: 5041889 (1991-08-01), Kriedt et al.

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