发明名称 |
LAN interface with simplified overcurrent protection |
摘要 |
A local area network (LAN) interface port with a simple overcurrent protection circuit which isolates the power supply connection for the port from fault conditions on the LAN. The circuit has a normally-on field effect pass transistor in line with the load terminal. The pass transistor shuts off when a fault condition is detected. Such a condition is detected when the voltage across a sense resistor becomes greater than the voltage across a reference resistor. A current mirror is made up of a transistor array and the sense and reference resistors. The current mirror compares the two voltages, and a bipolar transistor switches the gate voltage of the pass transistor on when the fault condition is detected. The design is particularly useful with the LAN system specified in ANSI/IEEE Standard 802.3, commonly known as Ethernet.
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申请公布号 |
US5548467(A) |
申请公布日期 |
1996.08.20 |
申请号 |
US19940195246 |
申请日期 |
1994.02.14 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
HEANEY, JAMES A.;RASMUS, TODD M. |
分类号 |
H02H3/087;H04L12/413;(IPC1-7):H02H3/00 |
主分类号 |
H02H3/087 |
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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