Patent ID: 6256385
Filing Date: 2001-07-03
Classification: H04M

Abstract:
A power supply adapter circuit having a line terminal and a reference terminal for receiving therebetween a supply voltage from a power supply source having a series is output resistance, and an output terminal for supplying an output voltage to any external circuit connected between the output terminal and the reference terminal, the adapter circuit comprising:a comparator module having a first input for receiving a voltage that represents the supply voltage received from the power supply source after any voltage drop across said series output resistance, a second input for receiving a reference voltage that represents a predetermined nominal regulation value, and an output for delivering a signal which represents the result of the comparison between the voltages received at said first and second inputs,a regulation module for adjusting the value of the output voltage of the power supply adapter circuit to a regulation value which is normally equal to the predetermined nominal regulation value, said regulation module having an input coupled to the output of the comparator module, andmeans for adjusting the regulation value to the value of a voltage delivered to the adapter circuit by a voltage source included in an external circuit connected between the output terminal and the reference terminal, when the value of the voltage delivered to the adapter by the voltage source is greater than the predetermined nominal regulation value.