Browse Prior Art Database

In-Line USB Power Adaptor

IP.com Disclosure Number: IPCOM000099071D
Publication Date: 2005-Mar-10
Document File: 2 page(s) / 43K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a circuit design that enables an external power supply to provide any required current needed by a USB device.

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In-Line USB Power Adaptor

Disclosed is a method for a circuit design that enables an external power supply to provide any required current needed by a USB device.

Background

As USB buses mature, there is a desire to have attached USB devices use the bus performance, but not the power. There are other products that provide external power to the USB device (e.g. the USB HUB); however, all of these products are still limited by the USB specification.

General Description

The disclosed method is a new circuit design that enables an external power supply to provide any required current needed by a USB device (see Figure 1). The disclosed method combines a power switch to support the USB enumeration process and an external power source to provide the necessary current draw to the USB device.

Advantages

The disclosed method enables devices to be operated 60% above the current draws required by the USB2.0 specification. Design validation shows that the disclosed method can support up to 3x the USB2.0 required current draw, if an appropriate voltage source is provided.

Fig. 1

Disclosed anonymously