Overvoltage protection circuits

Details Overvoltage protection circuits Overvoltage protection circuits

H - Electricity

02

H

H02H 3/22 (2006.01) H02H 9/04 (2006.01) H04M 3/18 (2006.01)

Patent

CA 2002311

An overvoltage protection circuit for a pair of conductors carrying a balanced signal includes two similar protection elements connected in series between the conductors and two equal value resistors respectively connected in parallel with the elements, so that the junction point of the two elements is at a voltage midway between the voltages on the conductors and the protection elements present equal capacitances to the conductors. A third protection element is connected from the junction point of the two elements to ground to protect against excessive voltages relative to ground on the conductors. The voltage division provided by the resistors may be adjusted to improve the balance of the capacitances presented by the two protection elements.

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