发明名称 |
HIGH CURRENT PROTECTION CIRCUIT FOR TELEPHONE INTERFACE |
摘要 |
A telephone test set protected from an excessive current condition by a protection circuit that maintains sufficient loop current flow for continuous operation of the telephone equipment's functional circuitry. A series current-limiting element installed in the loop current path between a tip and ring interface and the circuitry of the telephone test set. A current shunting circuit installed across the tip - ring ports of the protected circuit downstream of the current-limiting element. A current sense circuit monitors the loop current and controls the operation of the shunting circuit. If a substantial overcurrent condition persists for an extended period of time, the resulting power dissipation associated with the high current flow will cause the current limiting element to change to a high impedance state. Once the overcurrent condition terminates, the series element will revert to its low impedance state.
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申请公布号 |
CA2266322(A1) |
申请公布日期 |
1999.10.03 |
申请号 |
CA19992266322 |
申请日期 |
1999.03.23 |
申请人 |
WONG, WAYNE KWOK-WAI;RODRIGUEZ, SAUL |
发明人 |
WONG, WAYNE KWOK-WAI;RODRIGUEZ, SAUL |
分类号 |
H02H3/02;H02H3/087;H02H9/02;H04M1/74;(IPC1-7):H02H9/02 |
主分类号 |
H02H3/02 |
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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