DC voltage supply circuit for two-wire connection to telephone communication appts.

摘要

The voltage supply circuit includes a dc voltage source connected to a load via an electrical FET switch. The load capacity of the electronic switch and the load are limited by a proportional-integral controller and a clock generator. During overload conditions, the electronic switch is alternately switched and closed. The threshold voltage is the maximum allowable for the load. The switching and blocking duration determined according to the overload level. The voltage supply circuit includes two integrators each composed of a resistor and a capacitor in series.