Patent ID: 8717044

Claim:
A power converter, comprising: first and second power lines; an alternating current (AC) to direct current (DC) converter circuit that applies a DC power supply voltage across the first and second power lines and that supplies the DC power supply voltage to a first electronic device to which the power converter is connected; first and second data lines; and control circuitry that includes a resistor that is coupled across the first and second data lines, wherein the control circuitry includes detector circuitry that detects modulated signals from the first electronic device on at least one of the first and second data lines, wherein the control circuitry determines from the modulated signals that the first electronic device is capable of receiving the DC power supply voltage at at least one of: currents above a given current level and voltages above a given voltage level and, in response, the control circuitry directs the alternating current (AC) to direct current (DC) converter circuit to supply the DC power supply voltage at at least one of: a current above the given current level and a voltage above the given voltage level, and wherein, when the power converter is connected to a second electronic device and the control circuitry fails to determine that the second electronic device is capable of receiving the DC power supply voltage at at least one of: currents above the given current level and voltages above the given voltage level, the control circuitry directs the alternating current (AC) to direct current (DC) converter circuit to supply the DC power supply voltage only at currents below the given current level and only at voltages below the given voltage level.