Telephone line sourced power supply

Details Telephone line sourced power supply Telephone line sourced power supply

H - Electricity

04

M

H04M 19/00 (2006.01) H04M 19/08 (2006.01) H04Q 7/20 (2006.01)

Patent

CA 2148178

In a device attached to a telephone line, power is provided by taking power from the telephone line when the device is off-hook. When the device remains on- hook, power is maintained to the circuitry in the unit by a charge stored in a capacitor. The capacitor charge is reduced to a level no longer able to sustain operation of the system, the device is briefly taken off-hook, allowing the capacitor to recharge. This is performed either by discrete circuitry or by a microcontroller, and further includes provisions preventing the device from remaining off-hook for an unduly long period of time.

Un dispositif raccordé à une ligne téléphonique tire son alimentation de cette ligne lorsqu'on décroche le récepteur. Lorsque le récepteur est raccroché, le circuit du dispositif continue d'être alimenté par l'énergie stockée dans un condensateur. Lorsque la réserve d'énergie du condensateur devient insuffisant pour bien faire fonctionner le dispositif, il suffit de décrocher momentanément le récepteur pour permettre au condensateur de se recharger. La recharge est réalisée soit par un circuit dédié soit par un microcontrôleur, et il est en plus prévu un moyen d'empêcher le décrochage indûment prolongé du dispositif.

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