发明名称 |
Circuit for controlling current in an adapter card |
摘要 |
A circuit embodied within an adapter card for hot-plugging with a card slot in a card slot coupled to a processor based system utilizes a biasing circuit for ensuring that the input voltage to the load of the adapter card is of a sufficient magnitude. The circuit also includes a FET/feedback circuit for opening and closing the circuit provided between the input voltage to the adapter card and the load. This FET/feedback circuit operates as a constant current source to charge the input capacitance of the load and converts to a switched mode when the load capacitance is fully charged. The biasing circuit controls the FET/feedback circuit so that it remains open during hot-plugging of the adapter card into the card slot to alleviate pin arching. A monitor/timer circuit prevents the FET/feedback circuit from operating in the constant-current mode for no longer than a predetermined amount of time. A latch circuit is provided to turn off the FET within the FET/feedback circuit upon sensing of a transient current through the load.
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申请公布号 |
US5572395(A) |
申请公布日期 |
1996.11.05 |
申请号 |
US19930171486 |
申请日期 |
1993.12.21 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
RASUMS, TODD M.;YU, FREDERICK K. |
分类号 |
G06F13/40;H02H9/00;(IPC1-7):H02H9/00 |
主分类号 |
G06F13/40 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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