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nuckolls.bob(at)aeroelect
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 Posted: Wed Sep 05, 2012 11:22 am Post subject: 19v laptop power in vehicles |
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We've had some discussions on the List about powering
lap-tops without a great mish-mash of inverters,
ac mains power supplies and their attendant cables.
Here's a gizmo I bought these two offers off eBay:
http://tinyurl.com/bn3nkw9
http://tinyurl.com/7vwr4ur
at very reasonable prices. I mounted the fan
to the up-converter heatsink thusly.
http://tinyurl.com/c7jc92s
http://tinyurl.com/bqqxhy8
http://tinyurl.com/c4kzeh4
E6000 or JB Weld gets a good grip on the
mounting surface. I'm going to us this in
my van up behind the glove-box. I don't KNOW
that it will benefit from forced cooling . . .
but heat-sink performance jumps up by quantum
values when subject to the smallest flow of
air.
This will allow me to put a 19V outlet on
the panel that needs only a short jumper
cord to the computer. This would no doubt
work in you airplane as well.
Bob . . . [quote][b]
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bicyclop(at)pacbell.net
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| Posted: Sat Sep 08, 2012 12:59 pm Post subject: 19v laptop power in vehicles |
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So, Bob,
The output is adjusted manually to 19v? Does input voltage affect output as in alternator running/not running. Does a laptop battery know not to overcharge itself.
Ed Holyoke
On 9/5/2012 12:21 PM, Robert L. Nuckolls, III wrote: [quote] We've had some discussions on the List about powering
lap-tops without a great mish-mash of inverters,
ac mains power supplies and their attendant cables.
Here's a gizmo I bought these two offers off eBay:
http://tinyurl.com/bn3nkw9
http://tinyurl.com/7vwr4ur
at very reasonable prices. I mounted the fan
to the up-converter heatsink thusly.
http://tinyurl.com/c7jc92s
http://tinyurl.com/bqqxhy8
http://tinyurl.com/c4kzeh4
E6000 or JB Weld gets a good grip on the
mounting surface. I'm going to us this in
my van up behind the glove-box. I don't KNOW
that it will benefit from forced cooling . . .
but heat-sink performance jumps up by quantum
values when subject to the smallest flow of
air.
This will allow me to put a 19V outlet on
the panel that needs only a short jumper
cord to the computer. This would no doubt
work in you airplane as well.
Bob . . . [b]
| | - 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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nuckolls.bob(at)aeroelect
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| Posted: Sat Sep 08, 2012 1:23 pm Post subject: 19v laptop power in vehicles |
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At 03:58 PM 9/8/2012, you wrote:
| Quote: | So, Bob,
The output is adjusted manually to 19v? |
Yes, you set it before connecting your computer
to it.
| Quote: | | Does input voltage affect output as in alternator running/not running. |
The power supply for laptops is not a highly
regulated device. The typical DC input to the
laptop goes immediately to a switchmode regulator
that produces a host of outputs needed by the
computer both for operation of the byte thrashing
hardware -and- charging the battery.
| Quote: | | Does a laptop battery know not to overcharge itself. |
Sort of . . . battery charge, discharge and state
of current capacity are managed by a combination
of goodies on the computer and/or within the battery
itself. The battery is not an autonomous component
in the system.
All the adapter needs to supply is 19 volts. The
computer would probably be 'happy' with anything
over the range of 17-21 volts.
Bob . . . [quote][b]
| | - 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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nuckolls.bob(at)aeroelect
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| Posted: Sat Sep 08, 2012 1:25 pm Post subject: 19v laptop power in vehicles |
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At 03:58 PM 9/8/2012, you wrote:
| Quote: | So, Bob,
The output is adjusted manually to 19v? |
Yes, you set it before connecting your computer
to it.
| Quote: | | Does input voltage affect output as in alternator running/not running. |
The power supply for laptops is not a highly
regulated device. The typical DC input to the
laptop goes immediately to a switchmode regulator
that produces a host of outputs needed by the
computer both for operation of the byte thrashing
hardware -and- charging the battery.
But the answer to your question is no. This power
supply is a switchmode boost device with a well
regulated output that varies little with changes
in load or input voltage.
| Quote: | | Does a laptop battery know not to overcharge itself. |
Sort of . . . battery charge, discharge and state
of current capacity are managed by a combination
of goodies on the computer and/or within the battery
itself. The battery is not an autonomous component
in the system.
All the adapter needs to supply is 19 volts. The
computer would probably be 'happy' with anything
over the range of 17-21 volts.
Bob . . . [quote][b]
| | - 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:
http://www.matronics.com/Navigator?AeroElectric-List |
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bicyclop(at)pacbell.net
Guest
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| Posted: Sat Sep 08, 2012 4:21 pm Post subject: 19v laptop power in vehicles |
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Thanks, Bob.
I think I'll try one.
Ed
On 9/8/2012 2:24 PM, Robert L. Nuckolls, III wrote: [quote] At 03:58 PM 9/8/2012, you wrote:
| Quote: | So, Bob,
The output is adjusted manually to 19v? |
Yes, you set it before connecting your computer
to it.
| Quote: | | Does input voltage affect output as in alternator running/not running. |
The power supply for laptops is not a highly
regulated device. The typical DC input to the
laptop goes immediately to a switchmode regulator
that produces a host of outputs needed by the
computer both for operation of the byte thrashing
hardware -and- charging the battery.
But the answer to your question is no. This power
supply is a switchmode boost device with a well
regulated output that varies little with changes
in load or input voltage.
| Quote: | | Does a laptop battery know not to overcharge itself. |
Sort of . . . battery charge, discharge and state
of current capacity are managed by a combination
of goodies on the computer and/or within the battery
itself. The battery is not an autonomous component
in the system.
All the adapter needs to supply is 19 volts. The
computer would probably be 'happy' with anything
over the range of 17-21 volts.
Bob . . . [b]
| | - 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:
http://www.matronics.com/Navigator?AeroElectric-List |
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