Electrical transmission or interconnection systems – Conductor arrangements or structure
Patent
1992-11-20
1995-01-24
Gaffin, Jeffrey A.
Electrical transmission or interconnection systems
Conductor arrangements or structure
307149, 361 9, 361788, 361799, H02H 720
Patent
active
053844920
ABSTRACT:
An apparatus and method for handling the connection/disconnection transition period of a printed circuit board to an actively empowered backplane which eliminates damaging surge currents and glitches by the use of temporarily functioning field effect transistor circuits which gradiently handle the current loads during the transition period. A set of specifically sized and predetermined lengths of connecting pins on the backplane insures that a programmed sequence of power connection and/or disconnection will occur which permits a group of field effect transistors to gradiently carry the changing current loads that occur during the insertion of the printed circuit board into the backplane. Likewise, during extraction of the printed circuit board from the backplane, the group of FETs (Field Effect Transistors) will carry and buffer the changing current loads from de-stabilizing the power supply source unit.
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patent: 3993935 (1976-11-01), Phillips et al.
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Brady Barnes "Insert Board into a Live System without any Hitches"; pp. 75-80; Electronic Design for May 11, 1989.
Baker Daniel L.
Carlson Robert H.
Gaffin Jeffrey A.
Kozak Alfred W.
Starr Mark T.
Unisys Corporation
Weinstein Stanton D.
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