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    • 10. 发明授权
    • Arrangement for protecting telecommunications equipment from voltage
transients
    • 保护电信设备免受电压瞬变的安排
    • US5953194A
    • 1999-09-14
    • US825833
    • 1997-04-04
    • Ian Paul Atkins
    • Ian Paul Atkins
    • H02H9/04H02H20060101H02H9/00H04M1/74H04M19/00
    • H04M1/745H02H9/005
    • An arrangement for protecting an electrical circuit such as a telephone circuit from a voltage transient comprises a voltage clamp or foldback device (3) arranged to be connected between a current-carrying line (1) and ground (1'), a capacitor (2) in series with it, and an inductance (4) series connected in the line. During normal operation the arrangement acts as an LC filter whose high frequency break-point is determined by the capacitance of the voltage clamp or foldback device (3) and the value of the inductance (4) which are chosen to give a break point of 1 kHz to 10 MHz. However, when the arrangement is subjected to a voltage transient, the voltage clamp or foldback device (3) fires causing the break-point to fall to a value determined by the values of the capacitor (2) and inductance (4). The arrangement may be used, for example, to protect the circuit against a rapid voltage drop caused by the firing of another circuit protection device such as a gas discharge tube 5.
    • 用于保护诸如电话电路的电路免受电压瞬变的布置包括:电压钳或折返装置(3),被布置成连接在载流线(1)和地(1')之间,电容器(2) )和一个串联的电感(4)串联。 在正常操作期间,该装置用作LC滤波器,其高频断点由电压钳或折返装置(3)的电容和电感(4)的值决定,以使断点为1 kHz至10 MHz。 然而,当该装置遭受电压瞬变时,电压钳或折返装置(3)发生引起断点下降到由电容器(2)和电感(4)的值确定的值。 该布置可以用于例如保护电路免受由诸如气体放电管5的另一电路保护装置的点火引起的快速电压降。