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Method for a smart wall wart Disclosure Number: IPCOM000010027D
Publication Date: 2002-Oct-09
Document File: 3 page(s) / 297K

Publishing Venue

The Prior Art Database


Disclosed is a method for a smart wall wart. Benefits include improved functionality and improved useability.

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Method for a smart wall wart

Disclosed is a method for a smart wall wart. Benefits include improved functionality and improved useability.


        � � � � � Off-the-shelf configurable power packs are not automatic. The device does not automatically set the voltage and polarity required to operate the consumer electronic (CE) device. Most people with a variety of CE devices in their home have many of these power packs and have a difficult time matching the power pack to the device it powers (see Figure 1).

        � � � � � Vcore VID is a related concept. A processor’s voltage is configured by a setting of five pins interpreted by the voltage regulators on the motherboard. This approach differs in many respects from the disclosure:

•        � � � � VID uses five dedicated pins to set a voltage from a table. By comparison, the SWW has only two connections, power and ground, where VID requires at least seven connections to accomplish a more limited function.

•        � � � � VID provides a simple voltage setting via direct read of the pins, where the SWW uses a modulation scheme to provide a richer communication protocol, and communicate numerous parameters in both directions.

•        � � � � Other power supplies self-regulate, but they are managed by dynamic adjustment in response to a feedback line that is in addition to the 2-pole power supply lines (+/-). The
disclosed method is not dynamic and requires no additional lines.


        � � � � � The disclosed method is a smart wall wart (SWW). It is an enhanced version of the transformer-based power supplies that provide power to consumer devices such as PDAs, cell phones, and answering machines (see Figure 2). Regardless of its power requirements, a device designed for compatibility with an SWW would be able to use any off-the-shelf unit without requiring any user configuration. Power configuration is automatic when the SWW is plugged into any compatible device.

        � � � � � The connection between a device and a power supply (PS) is a standard 2-pole connection (+/-). It may use a standard 2-pole connector. (Several varieties are in use today.) The device and the SWW are each equipped with a low-voltage smart circuit (LVSC) that includes modulation/demodulation circuitry to serially send messages across the...