US 2010/0064148 A1Published application

Universal USB power supply

AssigneeCyber Power System Inc.

InventorsLien-Hsun Ho, Yi-Chang Chou, Chun-Shih Yi

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Abstract

A universal series bus (USB) power supply has a DC power source, a USB power interface and a voltage modulation module. The USB power interface is for connecting to an electronic device that stores a default D+ voltage and a default D− voltage. The voltage modulation module connects to and outputs signals to the D+ and D− terminals of the USB power interface. If voltage levels of the output signals are not respectively identical to the default D+ and D− voltages, the voltage modulation module changes the voltage levels of the signals output to the D+ and D− terminals of the USB power interface until the voltage levels of the output signals are respectively identical to the default D+ and D− voltages. Therefore, the USB power supply may be applied to any kind of electronic device that is charged over a USB interface.

Claims11

Dependent claims

A universal series bus (USB) power supply comprising:

a DC power source;
a USB power interface comprising
a VBUS terminal being connected to the DC power source to obtain DC power;
a D+ terminal;
D− terminal;
and
a ground terminal being connected to the ground;
a current feedback detection unit being connected to the ground and the ground terminal of the USB power interface, detecting whether the ground terminal of the USB power interface outputs a current and outputting a detection result signal if the ground terminal of the USB power interface outputs a current;
and
a voltage modulation module being connected to the current feedback detection unit and receiving the detection result signal, being connected to and outputting signals to the D+ and D− terminals of the USB power interface, controlling the voltage levels of the signals output to the D+ and D− terminals of the USB power interface and maintaining the voltage levels of the signals when the received detection result signal represents that there is a current flowing from the ground terminal of the USB power interface.

7 more elements

Dependencies are inferred from the claim text.