Why is USB charging popular now?
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Why is USB charging popular now?
Just curious - why is USB charging of things like bike lights and other things so popular now? I was under the impression that it was much more inefficient to put a computer in the power transfer path from outlet to USB as compared to a direct wall plug in.
I'm aware of the ease of expanding USB with a USB expander hub, but even with that option, I still prefer something that doesn't depend on my computer to be powered/plugged in for charging.
I'm aware of the ease of expanding USB with a USB expander hub, but even with that option, I still prefer something that doesn't depend on my computer to be powered/plugged in for charging.
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Agree with not wanting to depend on a computer. Wall chargers that output USB charging voltage are readily available. The beauty of the USB connectors for charging is the universality. I can charge at home from the wall charger and keep a cable at work to charge my lights from my desk PC.
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Agree with not wanting to depend on a computer. Wall chargers that output USB charging voltage are readily available. The beauty of the USB connectors for charging is the universality. I can charge at home from the wall charger and keep a cable at work to charge my lights from my desk PC.
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Agree with not wanting to depend on a computer. Wall chargers that output USB charging voltage are readily available. The beauty of the USB connectors for charging is the universality. I can charge at home from the wall charger and keep a cable at work to charge my lights from my desk PC.
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Just about everyone has a cell/mobile/smart-phone, and USB charging is becoming/has become the standard, so I think it's more a convenience thing. I have a couple of Morotola Talkabout 2-way radios and they can be charged from a USB port even though they don't use the data lines.
- Wil
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I have a dozen or more USB wall chargers and also a few USB car chargers. They came with cell phones, tablets, cameras, video games, etc. They output different power levels, but are more or less compatible with each other. I'm glad that the industry is standardizing on one format so I'm not screwed if a charger breaks or gets lost. I don't mind if some products try to save money by not including a charger in the box.
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I think the USB output from a computer USB port is about .5 Amps. I seen AC powered USB chargers that provide 1 Amp and 2 Amps. I just bought a Light & Motion light. At .5 Amps, it requires 14 hours to charge. At 2 Amps it takes 4 hours.
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the amperage a computer will produce via the usb port depends on the age of the motherboard and the device. the motherboard will default to 500ma unless the device communicates it's desire for more(and the motherboard is capable of understanding those requests).
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FWIW, these Adafruit USB power supplies rock. They're cheap, they charge everything I've thrown at them (iPhone, Nexus 7, Kindle, bike lights, etc) and they work great on US or European power.
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USB amperage depends on a number of variables.
Good explanation here: https://www.extremetech.com/computing...our-smartphone
Good explanation here: https://www.extremetech.com/computing...our-smartphone
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FWIW, these Adafruit USB power supplies rock. They're cheap, they charge everything I've thrown at them (iPhone, Nexus 7, Kindle, bike lights, etc) and they work great on US or European power.
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FWIW, these Adafruit USB power supplies rock. They're cheap, they charge everything I've thrown at them (iPhone, Nexus 7, Kindle, bike lights, etc) and they work great on US or European power.
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Maybe, maybe not. Try some of the $1 product and let us know their reliability and their ability to charge high-current devices.
The chargers I bought from Adafruit two years ago are still going strong, and still quickly charge everything I've thrown at them.
(I also buy them from Adafruit because I believe in their mission and I have huge respect for their founder Limor Fried.)
The chargers I bought from Adafruit two years ago are still going strong, and still quickly charge everything I've thrown at them.
(I also buy them from Adafruit because I believe in their mission and I have huge respect for their founder Limor Fried.)
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I like USB charging because I know I have a charger. Otherwise I have to carry around another charger with me, which is annoying
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Are there USB chargers that can be hooked up to a dynamo so as to keep devices charged up while on long rides away from electrical power?
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Yes, there are a lot of choices for dynohub usb chargers.
I am planning on buying a B&M Luxos U headlight that has a USB charging port. That seems to be the most economic route if you need a good headlight too.
I am planning on buying a B&M Luxos U headlight that has a USB charging port. That seems to be the most economic route if you need a good headlight too.
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So, you are trying to charge a DC device from 110 volt AC.
Before USB, there weren't any standards for the transformers (the thing that converts AC to DC) and there were no standards for plugs (connecting the device into the charger).
USB is a standard. With USB, you can sell the device without having to sell a charger too. With USB. you don't need a different charger for different devices.
(You don't need a computer to charge USB devices.)
Before USB, there weren't any standards for the transformers (the thing that converts AC to DC) and there were no standards for plugs (connecting the device into the charger).
USB is a standard. With USB, you can sell the device without having to sell a charger too. With USB. you don't need a different charger for different devices.
(You don't need a computer to charge USB devices.)
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So, you are trying to charge a DC device from 110 volt AC.
Before USB, there weren't any standards for the transformers (the thing that converts AC to DC) and there were no standards for plugs (connecting the device into the charger).
USB is a standard. With USB, you can sell the device without having to sell a charger too. With USB. you don't need a different charger for different devices.
(You don't need a computer to charge USB devices.)
Before USB, there weren't any standards for the transformers (the thing that converts AC to DC) and there were no standards for plugs (connecting the device into the charger).
USB is a standard. With USB, you can sell the device without having to sell a charger too. With USB. you don't need a different charger for different devices.
(You don't need a computer to charge USB devices.)
#24
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I once lost the charger for a mobile phone and had to pay an arm and a leg for a new one, even though I had a drawer full of chargers from older phones, because the plugs are different for every make and they wouldn't work. I believe the European Union has set a date by which they have to be standardized. Of course, smart phones can now be charged with a USB cord, a positive move, I believe.
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Hmmm... I've had my eye on a Busch and Muller IQ Cyo 60 (recommended by a poster here at Bike Forums). How does the Luxos U match up to the Cyo? (Is this the one?) Maybe I should get one of those instead. I want something to hook up to the Shimano dynamo hub on a Brompton I've ordered. Thanks.
I'm sure the Luxos is brighter than any CYO. You should look at the beamshots on Peter White's site, they are HERE The Luxos U puts out a lot more light than anything else, it's almost hard to believe.