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    • 24. 发明授权
    • Method and apparatus for balancing capacitance in hybrid overvoltage protection device
    • 混合式过电压保护装置中电容平衡的方法和装置
    • US06950295B2
    • 2005-09-27
    • US10322112
    • 2002-12-17
    • Chanh C. VoJohn J. NapiorkowskiBarry G. Slotnick
    • Chanh C. VoJohn J. NapiorkowskiBarry G. Slotnick
    • H01C7/108H02H1/00
    • H01C7/108
    • Metal oxide varistors (MOVs) are employed in surge protection devices, such as overvoltage protection devices, between a pair of signal lines and ground to reduce the capacitive imbalance introduced by the overvoltage protector, thereby improving higher frequency transmissions over twisted-pair telephone lines. The MOVs are sorted into subgroups having a capacitive tolerance of no more than about 1.0 picofarad. MOVs with asymmetrical electrodes can also be sorted to reduce both the capacitance and the capacitive tolerance of the MOVs. The sorted MOVs can then be electrically connected in parallel with a gas discharge tube on each signal line to produce an overvoltage protection device, for example a station protector for use at a customer premises, having a capacitive imbalance that does not exceed about 1.3 picofarads. The use of asymmetrical electrodes reduces the capacitance of the sorted MOVs to less than about 30 picofarads.
    • 金属氧化物变阻器(MOV)用于一对信号线和地之间的过电压保护装置等浪涌保护装置,以减少由过电压保护器引入的电容性不平衡,从而改善双绞线电话线的高频传输。 MOV被分类为具有不超过约1皮秒的电容容限的子组。 具有不对称电极的MOV也可以分类,以减少MOV的电容和电容容限。 分类的MOV然后可以在每个信号线上与气体放电管并联电连接,以产生过电压保护装置,例如在客户住宅处使用的电站保护器,具有不超过约1.3皮法的电容性不平衡。 使用非对称电极将分类的MOV的电容降低到小于约30皮法。