Needed input into Power Subgroup Voltage Options

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Hello:

Per the UPAMD general group meeting today, I am sending this request for your input into an important criteria for the Power Subgroup.

Attached, please see the 10/7/2010 meeting notes and the agenda for the 10/21/2010 meeting. We need more participation as we decide the requirements for valid voltage(s). We’ve looked at 5 options described in the attached file. Please add your analysis of how each option impacts cost, size, efficiency, etc. before the 10/21 meeting.

So far, the group prefers a single voltage with a broad tolerance, i.e. 21V +/- 3V. This broad range accounts for voltage changes with different cable lengths, pin sizes, current drawn, etc. But can a single voltage be efficiently used by products as different as cordless phones, digital picture frames, laptops, printers and external storage devices? Would it be more cost effective to require sinks to regulate input voltages that may vary between 18V and 24V or to put the burden of voltage regulation on the power adapter such that the voltage at the sink is always 21V? Creating a power adapter that can change its output voltage adds complexity, but may offer energy savings. These are the issues we would like you to address in your analyses in the attached template.

Your participation is important. At the next Power Subgroup meeting, we will review your analyses and work towards a conclusion of the ideal voltage requirements for this spec. From there, we will draft voltage and power criteria to be voted upon. Then, we will look at issues surrounding the remaining goals including power for communications, ability to be both a sink and a source, power for both battery and non-battery devices, operation with unstable sources of power,

Next Power Subgroup Meeting:

7am Pacific, Thursday, October 21st

10am Eastern, Thursday, October 21st

3pm London, October 21st

10pm Taiwan, October 21st

11pm Japan, October 21st

See you on the October 21^st meeting. And, thanks for your input.

Regards,

Paul Panepinto

UPAMD Power Subgroup Chair

(970) 461-3077