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smegballs |
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 smegballs World Chat Champion
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orac |
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 orac World Chat Champion
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 Posted: 08:57 - 17 May 2015 Post subject: |
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what about the voltage that the device uses? along side that current is generally more useful than voltage.
when I built the macro rail, high torque stepper motors where able to take 48v but become more affective with lower voltage snd higher current.
also the standard isn't because of USB, although it is slated as USB standard, there are generally other standard that have to be abided by such as logic voltage level - which iirc has 2 standards with one being 4.5-5.5v (USB is 4.75 to 5.25v) for ttl and 12v for cmos logic. the USB standard is more related to the amount of current that needs to be delivered through the port which for a standard is circa 500ma. however the current available for charging is more like 5amp for dedicated chargers.
unfortunately due to the fact that current is more useful for thing like processors the chances of getting batteries that are higher voltage and lower current is very unlikely. not only because of the for mentioned but also due to the move to buck regulators which have their own power restrictions, while being more efficient at reducing voltage flow - also imagine carrying a phone that has to have extra hardware to get the CPU to work, or a pone that has to have transformer to drop the voltage and increase the current that is available. there are a lot more things to consider over the amount of power that can be stored and the rate that can be stored at, you have to be able to interface the battery and charging system to the rest of the tech which ultimately be restricted by the materials that its all made from - you may see a change if or when grapheme become main stream, until such times 5 volts is going to remain the standard.
USB is coming up to is 20th birthday so is doing pretty darn well, it won out over fire wire which didn't even see devise that charged from it, although would lend itself to the higher voltage with up to 30v @1.5amps but for the most part is not used much any more (apple dropped it from ipod usage in 2004).
you could go back the the serial standard which was 12v if you want but I very much doubt it will catch on due to is bulky nature ____________________ Current rides - 2016 Triumph Street Triple Rx, 1994 Suzuki Bandit 400 VM, TGB 204 Classic 125cc
"with nothing left to lose, there is everything to gain. It's not the size of the dog in the fight, it's the size of the fight in the dog" |
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dydey90 |
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 dydey90 World Chat Champion

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bamt |
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 bamt World Chat Champion

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orac |
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 orac World Chat Champion
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bamt |
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 bamt World Chat Champion

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 Posted: 09:11 - 17 May 2015 Post subject: |
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With regards to voltage vs current, pretty much any mobile device is going to need on board regulators to give the varied cores the precisely smooth voltage they need from the battery (which at 3.7-4.2V is exactly wrong for just about anything, including charging from 5v - blame the chemists!).
Cranking up the charging voltage therefore will just need different regulators, rather than new ones, and not have a massive impact on BOM. Being able to reduce the current flow will make it a bit easier on tiny connectors.
The way we are going with bigger screens we can start putting proper connectors back on!
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bladerunner |
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 bladerunner World Chat Champion
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bamt |
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 bamt World Chat Champion

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smegballs |
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 smegballs World Chat Champion
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smegballs |
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calyx |
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 calyx World Chat Champion
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smegballs |
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bladerunner |
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 bladerunner World Chat Champion
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Old Thread Alert!
The last post was made 10 years, 66 days ago. Instead of replying here, would creating a new thread be more useful? |
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