Patent ID: 7869229
Filing Date: 2011-01-11
Classification: H02M

Abstract:
1. A method comprising: (a) receiving a feedback signal indicative of a voltage across a secondary winding of a power converter, wherein the secondary winding is on a secondary side of the power converter, wherein the feedback signal has a voltage, wherein the power converter outputs an output voltage and has a charger cord with a plug, wherein the charger cord has a resistance, and wherein a plug voltage is present on the charger cord at the plug; (b) generating a cord correction signal, wherein the cord correction signal has a voltage; (c) generating a corrected feedback signal by subtracting the voltage of the cord correction signal from the voltage of the feedback signal, wherein the corrected feedback signal has a voltage; (d) comparing a reference voltage to the voltage of the corrected feedback signal; and (e) using the comparing in (d) to adjust the output voltage to compensate for a decrease in the plug voltage caused by the resistance of the charger cord.