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Hi Bob, I support these broad goals for
each of the sub-groups. The details will be ironed out at the sub-group level. My apology for not able to
attend this morning meeting due to travel conflict. Looking forward for the next
meeting, hopefully F2F to support the kick-off of the sub-groups. Regards, Osman
Sakr, CTO From: upamd@xxxxxxxx
[mailto:upamd@xxxxxxxx] On Behalf Of Bob Davis UPAMD, For the upcoming discussion. The current set of potential goals from the list on the
website from group input. I removed repeats and moved goal to obvious
areas. Please add to or subtract from this with reasons to the
reflector. If I missed any please comment. Power Goals – not including those adopted at the last
meeting --- 1.
Positive
rail and Negative rail 2.
Floating
connection, not grounded at adapter –Isolation (leakage) sufficient for medical
applications? 3.
Device
to Device to share power if needed –Possibly support powering one device from
another - Power sharing in mission and business
critical situations. 4.
Smart
interconnect. –Higher power enabled through communications
between devices 5.
Regular
non-battery and dead battery devices need starting power –Supply <~16V at
<~50mA – non-sparking- without communications for startup –Higher power
requires communications and software control -Floating electrical connection, electrically isolated – Safety –No shock or spark hazard
under any conditions Communications Goals – not including those adopted at the
last meeting --- 1. Use
existing standards if possible. –CAN bus,
RS422/RS485, PCM others? 2. Differential
signal communications –AC coupled on positive and negative power leads –Robust
system –EMI, EMC, ESD 3.
Other communications schema? 4. Possible
symmetrical operation –Allow device to source other devices –Allow power sharing to keep critical devices working in
emergencies --adaptive UPS –Software
controlled 5. No
communications = how much power? –Device
startup for regular non-battery powered devices 6. Provide
nominal 12-14V at <50mA until communications established –Device
startup for low battery or non-battery systems 7.
Must assume device protects itself at low end of battery to retain
restart capability. 8. Restarting
safety circuits is very battery and safety circuit specific. Battery failures
require new battery/external charge –No shock
hazard, power source protects self 9. Communications
messages needed (starting thoughts --extend for symmetrical operation) -
Identification of source and load. -
Statement of available power -
Status of Source -
Status of Load -
Termination normal and abnormal Connector Goals – not including those adopted at the last
meeting --- 1. Capable
of full >10W to 130W 2. Easy
disconnect AND cable retention capability in same common connector design –Easy disconnect to prevent tripping in office/home environment
–health and safety issue -Retention
mechanism -Magnetic or Mechanical –Strong
retention capability for rugged high acceleration environments
-car/boat/airplane/mission-critical 3.
Very high connect –disconnect life cycle capability –Many year
usage 4. Support
lower profile devices –10mm or less? (iPad=13.4mm to start with) 5mm or less goal –other
shapes and possibly flat surface connect 5. Watertight
or Water resistant –To keep coffee, tea, rain, adult beverages, out of the
connection. –Seal on
cable side of connection for easy replacement of cable or seal. 6. Positive
and Negative connection with communication AC coupled? –Assume
redundant contacts for reliability and current sharing? 7.
Aesthetically pleasing 8. Retention
mechanism -Magnetic or Mechanical –Magnetic possibly good choice but under patent, –Several
clip possibilities exist. New Ideas clearly welcome 9. Blind
mate friendly -it possible –think of mating adapters and device alignment by feel in the dark –Easy
docking station or charging station operation 10. Separate
Power Cable capability –Same connector on each end –adapter and device –Buy cable to meet length need –Reduce adapter cost –consumer buys UPAMD cable(s) to meet needs –Possible quick interface to join two cables –One
adapter could support multiple cables/devices 11. User
replaceable power cable –Most damage is to connectors and cables, replace as needed –Change cable to adjust length needs –Carry/borrow
backup cable Candidates
to chair the task groups should come forward. Task Chairs must represent
a neutral position with respect to the group they would chair. Respectfully; Bob Davis UPAMD Chair bobd@xxxxxxxx 408.857.1273 |