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user9253
Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan
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 Posted: Wed Dec 28, 2016 4:38 pm Post subject: 5 Volt Converter Product Review |
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I purchased a 5 volt converter on eBay (Item # 152124360516) and bench tested it.
With an input of 13 VDC, I connected a load to the output that drew 4.6 amps. The input current was 2.15 amps. The output voltage was 5.1 to 5.15 volts depending on which meter that I used. That is within the USB standard of 4.75 to 5.25. I calculated the efficiency to be 85 percent. I could not detect any AC ripple using both a meter and a scope. The weight is 112 grams (4 oz), Dimensions are 59mm x 65mm x 22mm. The mounting holes are 54mm center to center.
The seller exaggerated the efficiency, so the 10 amp output rating might be exaggerated too. Even so, this converter should be adequate for powering 2 or 3 devices.
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email(at)jaredyates.com
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| Posted: Wed Dec 28, 2016 5:54 pm Post subject: 5 Volt Converter Product Review |
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I just installed one that is very similar. Running two devices my ipad will
hold steady, but not charge. That's with a 5a fuse on the 12v supply, which
might be a little conservative.
On December 28, 2016 19:47:47 "user9253" <fransew(at)gmail.com> wrote:
| Quote: |
I purchased a 5 volt converter on eBay (Item # 152124360516) and bench
tested it.
With an input of 13 VDC, I connected a load to the output that drew 4.6
amps. The input current was 2.15 amps. The output voltage was 5.1 to 5.15
volts depending on which meter that I used. That is within the USB
standard of 4.75 to 5.25. I calculated the efficiency to be 85 percent. I
could not detect any AC ripple using both a meter and a scope. The weight
is 112 grams (4 oz), Dimensions are 59mm x 65mm x 22mm. The mounting
holes are 54mm center to center.
The seller exaggerated the efficiency, so the 10 amp output rating might be
exaggerated too. Even so, this converter should be adequate for powering 2
or 3 devices.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=464454#464454
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kenryan
Joined: 20 Oct 2009
Posts: 426
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| Posted: Wed Dec 28, 2016 6:15 pm Post subject: 5 Volt Converter Product Review |
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How many amps does it take to power a 10 inch IPad?
Sent from my Android. Sorry Steve.
On Dec 28, 2016 5:03 PM, "Jared Yates" <email(at)jaredyates.com (email(at)jaredyates.com)> wrote: | Quote: | --> AeroElectric-List message posted by: Jared Yates <email(at)jaredyates.com (email(at)jaredyates.com)>
I just installed one that is very similar. Running two devices my ipad will hold steady, but not charge. That's with a 5a fuse on the 12v supply, which might be a little conservative.
On December 28, 2016 19:47:47 "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)> wrote:
| Quote: | --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>
I purchased a 5 volt converter on eBay (Item # 152124360516) and bench tested it.
 With an input of 13 VDC, I connected a load to the output that drew 4.6 amps. The input current was 2.15 amps. The output voltage was 5.1 to 5.15 volts depending on which meter that I used. That is within the USB standard of 4.75 to 5.25. I calculated the efficiency to be 85 percent. I could not detect any AC ripple using both a meter and a scope. The weight is 112 grams (4 oz), Dimensions are 59mm x 65mm x 22mm. The mounting holes are 54mm center to center.
The seller exaggerated the efficiency, so the 10 amp output rating might be exaggerated too. Even so, this converter should be adequate for powering 2 or 3 devices.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=464454#464454
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user9253
Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan
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| Posted: Wed Dec 28, 2016 7:11 pm Post subject: Re: 5 Volt Converter Product Review |
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Read this post about charging an iPad:
http://www.matronics.com/digest/aeroelectric-list/Digest.AeroElectric-List.2012-09-17.html#MESSAGE7
There must be voltage on USB pins 2 & 3 to signal the iPad to draw more charging current. Use a voltage divider with no resistor less than 10K ohm. Below is quote from the above mentioned post:
| Quote: | Here's what your USB receptacle needs to provide to properly quick-charge your iPad (for iPhones, reverse pins 2 and 3):
Pin 1 (+V): 5V (no less; ideally ~5.2V)
Pin 2 (D-): 2.00V
Pin 3 (D+): 2.75V
Pin 4: Ground |
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email(at)jaredyates.com
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| Posted: Wed Dec 28, 2016 8:20 pm Post subject: 5 Volt Converter Product Review |
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Good point, thanks! I believe those pins are shorted presently.
On December 28, 2016 22:18:43 "user9253" <fransew(at)gmail.com> wrote:
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edpav8r(at)yahoo.com
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| Posted: Wed Dec 28, 2016 11:56 pm Post subject: 5 Volt Converter Product Review |
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In the four years since I wrote that, Apple has released a fourth charging scheme for their 12-watt (5V, 2.4A) chargers that began shipping with the iPad Air. If you configure your USB port as follows, it will rapid-charge all but the earliest Apple iDevices:
Pin 1 (+V): 5.0V-5.2V
Pin 2 (D-): 2.75V
Pin 3 (D+): 2.75V
Pin 4: Ground
Note that Pins 2 and 3 are the same voltage, but they must *not* be shorted together. Use two identical voltage dividers to provide the same voltage to both pins separately.
For the voltage converter that Joe purchased (output = 5.1V), I would use a voltage divider comprised of 11.8k over 13.7k.
Connect as follows: 5V --> 11.8k --> USB Pin 2 or 3 --> 13.7k --> Ground
Suitable resistors:
http://www.digikey.com/product-detail/en/yageo/MFR-25FBF52-11K8/11.8KXBK-ND/13232
-and-
http://www.digikey.com/product-detail/en/yageo/MFR-25FBF52-13K7/13.7KXBK-ND/13244
One other note. Use heavier wire on the 5V output than the charging current would normally call for. Resistive voltage drop can easily cause the 5V rail to fall below 5V over a modest wire length, which will change the D+ and D- voltages as well. Apple devices are picky -- it's important that +V, D+ and D- are correct.
Eric
On Dec 28, 2016, at 8:11 PM, user9253 <fransew(at)gmail.com (fransew(at)gmail.com)> wrote:
| Quote: | Read this post about charging an iPad:
http://www.matronics.com/digest/aeroelectric-list/Digest.AeroElectric-List.2012-09-17.html#MESSAGE7
There must be voltage on USB pins 2 & 3 to signal the iPad to draw more charging current. Use a voltage divider with no resistor less than 10K ohm. Below is quote from the above mentioned post:
| Quote: | Here's what your USB receptacle needs to provide to properly quick-charge your iPad (for iPhones, reverse pins 2 and 3):
Pin 1 (+V): 5V (no less; ideally ~5.2V)
Pin 2 (D-): 2.00V
Pin 3 (D+): 2.75V
Pin 4: Ground |
|
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rnjcurtis(at)charter.net
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| Posted: Thu Dec 29, 2016 6:13 am Post subject: 5 Volt Converter Product Review |
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In the four years since I wrote that, Apple has released a fourth charging scheme for their 12-watt (5V, 2.4A) chargers that began shipping with the iPad Air. If you configure your USB port as follows, it will rapid-charge all but the earliest Apple iDevices:
Pin 1 (+V): 5.0V-5.2V
Pin 2 (D-): 2.75V
Pin 3 (D+): 2.75V
Pin 4: Ground
Note that Pins 2 and 3 are the same voltage, but they must *not* be shorted together. Use two identical voltage dividers to provide the same voltage to both pins separately.
For the voltage converter that Joe purchased (output = 5.1V), I would use a voltage divider comprised of 11.8k over 13.7k.
Connect as follows: 5V --> 11.8k --> USB Pin 2 or 3 --> 13.7k --> Ground
Suitable resistors:
http://www.digikey.com/product-detail/en/yageo/MFR-25FBF52-11K8/11.8KXBK-ND/13232
-and-
http://www.digikey.com/product-detail/en/yageo/MFR-25FBF52-13K7/13.7KXBK-ND/13244
One other note. Use heavier wire on the 5V output than the charging current would normally call for. Resistive voltage drop can easily cause the 5V rail to fall below 5V over a modest wire length, which will change the D+ and D- voltages as well. Apple devices are picky -- it's important that +V, D+ and D- are correct.
Eric
On Dec 28, 2016, at 8:11 PM, user9253 <fransew(at)gmail.com (fransew(at)gmail.com)> wrote:
| Quote: | Read this post about charging an iPad:
http://www.matronics.com/digest/aeroelectric-list/Digest.AeroElectric-List.2012-09-17.html#MESSAGE7
There must be voltage on USB pins 2 & 3 to signal the iPad to draw more charging current. Use a voltage divider with no resistor less than 10K ohm. Below is quote from the above mentioned post:
| Quote: | Here's what your USB receptacle needs to provide to properly quick-charge your iPad (for iPhones, reverse pins 2 and 3):
Pin 1 (+V): 5V (no less; ideally ~5.2V)
Pin 2 (D-): 2.00V
Pin 3 (D+): 2.75V
Pin 4: Ground |
|
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http://www.matronics.com/Navigator?AeroElectric-List |
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edpav8r(at)yahoo.com
Guest
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| Posted: Thu Dec 29, 2016 8:03 am Post subject: 5 Volt Converter Product Review |
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I'm not sure what an Android device (a generic term for devices from many manufacturers) will make of an Apple charger. It won't do it any harm, but I don't know if it will charge. Samsung, for example, uses a common (shorted) 1.25V on both data pins.
Someone mentioned that the data pins on his charger are shorted together. That defines a Dedicated Charging Port (and a Chinese standard). Most devices will accept this scheme, but will only draw 0.5A in accordance with the USB standard. That's why a device will hold steady under use but not add charge.
There are integrated circuits designed for this purpose that monitor a USB port and automatically configure the port to satisfy the device that's plugged into it. They work fine, but they're a pain to use as they're all in tiny surface-mount packages.
Eric
On Dec 29, 2016, at 7:11 AM, rnjcurtis <rnjcurtis(at)charter.net (rnjcurtis(at)charter.net)> wrote:
| Quote: | Am I correct in assuming that if I wire a USB port this way for an Apple device, that it will be comparable with all other Android devices.
Roger
Sent from: YOGA TABLET 10 HD+
Eric Page <edpav8r(at)yahoo.com (edpav8r(at)yahoo.com)> wrote:
In the four years since I wrote that, Apple has released a fourth charging scheme for their 12-watt (5V, 2.4A) chargers that began shipping with the iPad Air. If you configure your USB port as follows, it will rapid-charge all but the earliest Apple iDevices:
Pin 1 (+V): 5.0V-5.2V
Pin 2 (D-): 2.75V
Pin 3 (D+): 2.75V
Pin 4: Ground
Note that Pins 2 and 3 are the same voltage, but they must *not* be shorted together. Use two identical voltage dividers to provide the same voltage to both pins separately.
For the voltage converter that Joe purchased (output = 5.1V), I would use a voltage divider comprised of 11.8k over 13.7k.
Connect as follows: 5V --> 11.8k --> USB Pin 2 or 3 --> 13.7k --> Ground
Suitable resistors:
http://www.digikey.com/product-detail/en/yageo/MFR-25FBF52-11K8/11.8KXBK-ND/13232
-and-
http://www.digikey.com/product-detail/en/yageo/MFR-25FBF52-13K7/13.7KXBK-ND/13244
One other note. Use heavier wire on the 5V output than the charging current would normally call for. Resistive voltage drop can easily cause the 5V rail to fall below 5V over a modest wire length, which will change the D+ and D- voltages as well. Apple devices are picky -- it's important that +V, D+ and D- are correct.
Eric
On Dec 28, 2016, at 8:11 PM, user9253 <fransew(at)gmail.com (fransew(at)gmail.com)> wrote:
| Quote: | Read this post about charging an iPad:
http://www.matronics.com/digest/aeroelectric-list/Digest.AeroElectric-List.2012-09-17.html#MESSAGE7
There must be voltage on USB pins 2 & 3 to signal the iPad to draw more charging current. Use a voltage divider with no resistor less than 10K ohm. Below is quote from the above mentioned post:
| Quote: | Here's what your USB receptacle needs to provide to properly quick-charge your iPad (for iPhones, reverse pins 2 and 3):
Pin 1 (+V): 5V (no less; ideally ~5.2V)
Pin 2 (D-): 2.00V
Pin 3 (D+): 2.75V
Pin 4: Ground |
|
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http://www.matronics.com/Navigator?AeroElectric-List |
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user9253
Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan
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| Posted: Sat Dec 31, 2016 6:29 am Post subject: Re: 5 Volt Converter Product Review |
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Eric,
Please verify that the "D-" data pin (on a USB charging port) has a positive voltage even though it is labeled with a minus sign.
Also, I assume that computers do not have voltage on the data pins because that would interfere with data transfer. Is that correct or wrong?
Thanks, Joe
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Joe Gores |
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edpav8r(at)yahoo.com
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| Posted: Sat Dec 31, 2016 1:35 pm Post subject: 5 Volt Converter Product Review |
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Yes, for charging adapters, both voltages are positive. The D+ and D- labels refer to their use in USB data communications.
You're correct. A computer's USB port won't have a constant voltage on the data pins like a charger has, but the voltage will rise and fall at very high speed to send digital data.
Apple computers probably have a chip in the USB data path that communicates with their Lightning cable authentication chip (speculation on my part).
As I mentioned in another post, there are dedicated charging port chips that sense the attached device and configure the data pin voltages appropriately.
Eric
| Quote: | On Dec 31, 2016, at 6:29 AM, user9253 <fransew(at)gmail.com> wrote:
Eric,
Please verify that the "D-" data pin has a positive voltage even though it is labeled with a minus sign.
Also, I assume that computers do not have voltage on the data pins because that would interfere with data transfer. Is that correct or wrong?
Thanks, Joe
--------
Joe Gores
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http://www.matronics.com/Navigator?AeroElectric-List |
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