Voltage boost circuit for telephone systems

Details Voltage boost circuit for telephone systems Voltage boost circuit for telephone systems

H - Electricity

04

M

379/56, 379/63

H04M 1/76 (2006.01) H04M 3/22 (2006.01)

Patent

CA 1068835

VOLTAGE BOOST CIRCUIT FOR TELEPHONE SYSTEMS Abstract of the Disclosure In a voltage boost circuit, for telephone systems where reverse battery supervision is employed, optically coupled semiconductor devices are used to control both the polarity and the charge on a nonpolar capacitor. This capacitor is powered from a DC to DC converter and the capacitor serves the dual functions of a rectifier filter capacitor and a voice frequency (VF) bypass capacitor. The voltage boost circuit charges the capacitor so that it aids the central office battery, thus extending the normal operating range of the central office. Whenever the current in the loop drops below a predetermined threshold level, the voltage boost is removed by a rapid discharge of the aforementioned capacitor. When the loop is closed, the capacitor is quickly charged to the full boost voltage with a polarity so as to aid, or increase, the current in the loop. - i -

287220

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