Reduced capacitance and capacitive imbalance in surge...

Details Reduced capacitance and capacitive imbalance in surge... Reduced capacitance and capacitive imbalance in surge...

2005-06-28

2005-06-28

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

High voltage dissipation

Reexamination Certificate

active

06912112

ABSTRACT:
Metal oxide varistors (MOVs) are employed in surge protection devices, such as overvoltage protection devices, between signal lines and ground to reduce the capacitance and the capacitive imbalance introduced by the overvoltage protector, thereby improving higher frequency transmissions, such as xDSL communications, over a twisted-pair telecommunications network. The MOVs can be stacked electrically in series to reduce the capacitance of each MOV and to reduce the variability, tolerance or spread of the capacitance between MOVs. Asymmetrical MOVs with electrodes having different surface areas can also be used to reduce capacitance and to reduce capacitive imbalance between MOVs. Furthermore, Asymmetrical MOVs, as well as MOVs with electrodes having the same surface area, can be stacked electrically in series. Such series stacked, asymmetrical, and series stacked asymmetrical MOVs can be used in parallel with a gas discharge tube to form, for example, a station protector for use at a customer premises.

REFERENCES:
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patent: 6421220 (2002-07-01), Kobsa
patent: 6501634 (2002-12-01), Hubbell

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