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Old 09-23-09, 11:47 AM   #1
intlsg
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Power Supply

My company is working to develop a power supply. I am curious as to a few things that would help us in this development.
1. Do you currently take a power supply with you? If yes, what is it?
2.If there was a lightweight easy to use power supply would you bring an item with you that you normally wouldn't (ie: cell phone, gaming system)?

Any info you could provide would be very helpful.

Thanks,
Debbie
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Old 09-23-09, 11:59 AM   #2
truman
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I can tell you what I'm currently looking for - and not finding - in a power supply:

1. A smart charger for up to 4 (I could live with 2) standard "AA" or "AAA" batteries, multichemistry for NiMH or Li ion is a plus
2. 2 to 4 15-volt USB outputs
3. A short length of cable to the 110VAC plug, rather than a 'wall-wart' form factor.

Obviously, it needs to be both tiny and featherlight...

Last edited by truman; 09-23-09 at 01:14 PM.
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Old 09-23-09, 12:40 PM   #3
dlmphotog
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Weight is the number one concern for people who have to carry it. Any item that can do more than one thing is also a plus. Nice to have information on the power supply status such as amps in/out, run time, etc, maybe a low power LCD display

Inputs should include DC sources such as from solar, dynamo hubs, auto cigarette and USB. AC should have international voltage options without a “wall wart”.

I agree, 2-4 USB outputs would be good. But a battery charger can be an option.
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Old 09-23-09, 02:54 PM   #4
tdreyer1
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Solar! (and wind? just kidding)
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Old 09-23-09, 03:37 PM   #5
Road Fan
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Quote:
Originally Posted by intlsg View Post
My company is working to develop a power supply. I am curious as to a few things that would help us in this development.
1. Do you currently take a power supply with you? If yes, what is it?
2.If there was a lightweight easy to use power supply would you bring an item with you that you normally wouldn't (ie: cell phone, gaming system)?

Any info you could provide would be very helpful.

Thanks,
Debbie
EMI is critical. It should be possible to charge hand-held/nomadic devices while riding without affecting the integrity of heart rate monitor operation, and other wireless bike instrumentation. There are problems in the bike world. For example, some dimmed or flashing LED headlamps interfere with my HRM while riding in a dimmed mode. I think it's especially pertinent, since as an EE and power supply designer, I would choose a switchmode technology to achieve this wide range of power processing goals.

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Old 09-23-09, 10:06 PM   #6
LeeG
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A fuel cell that runs on alcohol would be adequate. How about shrinking this down to about the size of a couple decks of cards?

http://www.treehugger.com/files/2008...eldtesting.php

Last edited by LeeG; 09-23-09 at 10:11 PM.
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