Patent ID: 9712052
Date: 2017-07-18
CPC Classifications: G05F,H02M

Claim:
1. A power supply apparatus with cable voltage drop compensation, adapted for supplying power to an external load, the power supply apparatus comprising: a first power pin, adapted for coupling to a first power contact of the external load through a first wire; a second power pin, adapted for coupling to a second power contact of the external load through a second wire; a direct current (DC) output regulator, receiving an input voltage and a feedback voltage and accordingly generates an output voltage and an output current; a current sensing circuit, coupled between an output voltage terminal of the DC output regulator and the first power pin for sensing the output current, or coupled between a reference voltage terminal of the DC output regulator and the second power pin for sensing the output current, so as to accordingly generate a sensing voltage; and a compensation circuit, coupled to the current sensing circuit so as to receive the sensing voltage, and coupled between the first power pin and the second power pin or between the output voltage terminal of the DC output regulator and the reference voltage terminal of the DC output regulator so as to generate the feedback voltage, wherein the compensation circuit generates a compensation voltage responding to the sensing voltage, and uses the compensation voltage to compensate the output voltage, wherein the compensation voltage is a sum of a voltage drop of the first wire and a voltage drop of the second wire, wherein the compensation circuit comprises: