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1. 发明申请

US20040228060A1 Overvoltage and overcurrent protection circuit and telephone interface protection circuit 审中-公开
标题翻译：过压和过流保护电路和电话接口保护电路
公开(公告)号：US20040228060A1
公开(公告)日：2004-11-18
申请号：US10457784
申请日：2003-06-10
申请人： Uniden Corporation
发明人： Yoshinobu Fujiwara , Kyokusei Matsuda , Hiroshi Adachi
IPC分类号： H02H005/04
CPC分类号： H02H9/042 , H04M3/18
摘要： An object of the present invention is to provide a telephone interface protection circuit that has excellent standards of safety. In order to achieve this, the telephone interface protection circuit according to this invention comprises a voltage limiting element to limit surge voltages to no more than the withstand voltage of the circuit to be protected; and a positive temperature coefficient thermostatic resistor to limit the flow of overcurrents to the circuit to be protected. The voltage limiting element and positive temperature coefficient thermostatic resistor are thermally coupled together. In the event that an overcurrent is continuously supplied from the subscriber telephone lines, even in the zone below the sensitive current, when the terminal voltage of the voltage limiting element exceeds the threshold voltage, the positive temperature coefficient thermostatic resistor receives the heat emitted from the voltage limiting element and shifts the Curie point, ensuring that the circuit to be protected is blocked from the subscriber telephone lines.
摘要翻译：本发明的目的是提供一种具有优良的安全标准的电话接口保护电路。为了实现这一点，根据本发明的电话接口保护电路包括限制电压限制元件，以将浪涌电压限制在不超过待保护电路的耐受电压; 和正温度系数恒温电阻，以限制要保护的电路的过电流。电压限制元件和正温度系数恒温电阻热耦合在一起。在从用户电话线连续供给过电流的情况下，即使在低于敏感电流的区域中，当限压元件的端子电压超过阈值电压时，正温度系数恒温电阻器接收从电压限制元件并移动居里点，确保要保护的电路从用户电话线路中被阻止。

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