Anti-lightning protection for telephone connection
AssigneeSTMicroelectronics (Tours) SAS
InventorsCédric Appere, André Bremond, Christian Ballon
Life of this patent
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Abstract
A structure for protecting a circuit connected to first and second rails of a telephone connection against overvoltages, including: first and second diodes in anti-series between the first and second rails; a first capacitor in parallel with a first resistor between a first node common to the first and second diodes and a low voltage reference node; and a protection element capable of removing fast overvoltages between any of the rails and the low reference voltage node when these overvoltages exceed a first threshold associated with the voltage of the first node.
Claims9
A structure for protecting a circuit connected to first and second rails of a telephone connection against overvoltages, comprising:
- first and second diodes in anti-series between the first and second rails;
- a first capacitor in parallel with a first resistor between a first node common to the first and second diodes and a low reference voltage node;
- and
- a protection element capable of removing fast overvoltages between any of the rails and the low reference voltage node when the overvoltages exceed a first threshold associated with to the voltage of the first node (N).
A method for protecting a circuit connected to first and second rails of a telephone line against overvoltages, comprising the steps of:
- storing, in an initialization phase, the maximum or minimum voltage level of the signals applied to the first and second rails;
- and
- triggering a protection element connected between the first and second rails and to a low reference voltage, when a fast overvoltage exceeding a threshold associated with said maximum or minimum level occurs between any of the rails and the low reference voltage node.
Dependencies are inferred from the claim text.