Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1995-10-12
1998-02-03
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
307147, 395283, 361 58, H01H 4700
Patent
active
057148090
ABSTRACT:
A hot-plugging circuit for controlling the rate of application or withdrawal of both voltage and current to a user circuit to permit power up or down of the user circuit either to conserve energy usage in operation or to facilitate non-disruptive insertion or extraction of the user circuit from a larger, continually-powered, circuit. A semiconductor switch is used as the principle current and voltage control element. Current through the switch is monitored during transitions, and is converted to a voltage level. A voltage ramp relative to the voltage applied to the user circuit is generated and compared with the current representing voltage level to generate a control signal for controlling the rate of turn ON or turn OFF of the semiconductor switch. The voltage ramp generation is controlled by an ON/OFF control voltage level. Undervoltage occurring after a turn-ON transition is sensed and causes turn-OFF of the semiconductor switch in order to avoid operational deficiencies of the user circuit due to inadequate supply voltage.
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Dosse William G.
International Business Machines - Corporation
Kaplan Jonathan S.
Phillips Steven B.
Shoop Jr. William M.
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