H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 19/08 (2006.01) H04M 11/00 (2006.01)
Patent
CA 2187452
Where apparatus connected to a communications line is powered directly from that line it is essential that the current drawn is minimised. The present invention provides a variable power supply comprising a dc to dc conversion circuit (3) controlled by an oscillator (2). The output of the dc to dc conversion circuit (3) is used to power tone detection circuit (4) which monitors for a wake-up tone. On receipt of an appropriate wake-up tone the tone detection circuit (4) provides an interrupt signal to a microprocessor (1) which causes an increase in the oscillator frequency. The increased frequency oscillator (2) increases the power drawn from line via the dc to dc conversion circuit.
Lorsqu'un appareil raccordé à une ligne de communications est alimenté directement par cette ligne, il est essentiel que le courant tiré soit réduit au minimum. La présente invention se rapporte à une alimentation en courant variable comprenant un convertisseur continu-continu (3) commandé par un oscillateur (2). La sortie du convertisseur continu-continu (3) est utilisée pour alimenter un circuit de détection (4) d'un signal sonore qui contrôle un signal sonore de réveil. A la détection d'un signal sonore de réveil approprié, ledit circuit de détection (4) envoie un signal d'interruption à un microprocesseur (1) qui provoque une amplification de la fréquence de l'oscillateur. L'oscillateur (2) à la fréquence amplifiée accroît le courant tiré de la ligne de communications par l'intermédiaire du convertisseur continu-continu.
British Telecommunications Public Limited Company
Gowling Lafleur Henderson Llp
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