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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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mrspudandcompany(at)veriz
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 Posted: Sun Dec 29, 2013 6:04 pm Post subject: E-bus diode |
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The spec sheet says the forward voltage drop is 0.98V. Do you think that is
acceptable?
Roger
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Sun Dec 29, 2013 6:53 pm Post subject: Re: E-bus diode |
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The voltage drop is dependent on the current. It is 0.98 volt at 300 amp. At 30 amps it is less than 0.5 volts. See the graph on the data sheet:
http://ixapps.ixys.com/DataSheet/DSA300I200NA.pdf
Under the picture of the device on the data sheet, it says, "Backside: Isolated". So the base does not have to be electrically insulated from the airframe.
Joe
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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nuckolls.bob(at)aeroelect
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| Posted: Mon Dec 30, 2013 7:56 am Post subject: E-bus diode |
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At 06:33 PM 12/29/2013, you wrote:
Yes, but you may want to seek anohter source.
Mouser seems to want to sell these in lots
of 10 minimum.
Bob . . .
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nuckolls.bob(at)aeroelect
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| Posted: Mon Dec 30, 2013 8:04 am Post subject: E-bus diode |
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At 08:04 PM 12/29/2013, you wrote:
| Quote: |
<mrspudandcompany(at)verizon.net>
>Would this Schottky Diode be suitable for E-bus Feed?
>http://www.mouser.com/ProductDetail/IXYS/DSA300I200NA/?qs=sGAEpiMZZMtQ8nqTKtFS%2fAkrg%2fe%2fM1X2RJuduJKKNsI%3d
>It appears to be very robust with easy mounting.
The spec sheet says the forward voltage drop is 0.98V. Do you think
that is acceptable?
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That's a worst case condition which is almost never
realized in the manner in which we use them. Furhter,
as explained in other narratives concerning drops
in the e-bus normal feed diodes, there's no chance
that a diode offers an 'unacceptable' voltage drop.
The normally expected drops in all forms of diode
will produce an alternator-operating e-bus voltage
no less than 13v and probably HIGHER. While operating
the e-bus battery-only, available voltage will be 12.5
volts or LOWER . . . and we expect things to work
just fine at that level too.
Don't get wrapped about the "oh-my-gosh-there's-
a-voltage-drop" axle. It the grand scheme of
things its immaterial. This is why we've offered
and recommended the plain-vanilla, bridge rectifier
with fast-on tabs for nearly 20 years . . . cheap,
easy to mount and you can get the things at
Radio Shack.
Bob . . .
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jluckey(at)pacbell.net
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| Posted: Mon Dec 30, 2013 8:53 am Post subject: E-bus diode |
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I recently purchased just a few from Mouser...
From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com>
To: aeroelectric-list(at)matronics.com
Sent: Monday, December 30, 2013 7:55 AM
Subject: Re: AeroElectric-List: E-bus diode
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>
At 06:33 PM 12/29/2013, you wrote:
Yes, but you may want to seek anohter source.
Mouser seems to want to sell these in lots
of 10 minimum.
Bob . . . p; * The Builder's Bookstore www.homebubsp; * Race Consulting
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Tundra10
Joined: 14 Jun 2010
Posts: 102
Location: Scarborough, Ontario
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| Posted: Mon Dec 30, 2013 8:55 am Post subject: E-bus diode |
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Joe,
How about the IXYS DSS 2x81-0045A ? It is in the same SOT-227B package.
It is a lower current device, but still capable of much larger
currents than those likely seen on the E-Bus. According to the graph,
it has a typical forward drop of 0.34V at 10A.
Even better - you can buy 1 instead of minimum quantity 10 and they
are 25% cheaper 
Jeff Page
Dream Aircraft Tundra #10
http://ca.mouser.com/ProductDetail/IXYS/DSS2x61-0045A/?qs=%2fha2pyFaduhdMr45WqeM8mDZl76obrBu5hnr8BNQ46k%3d
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Mon Dec 30, 2013 9:47 am Post subject: Re: E-bus diode |
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Jeff, did you mean DSS2x61-0045A? It has the characteristics that you mentioned. I could not find DSS 2x81-0045A.
Joe
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Joe Gores |
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Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
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| Posted: Mon Dec 30, 2013 1:50 pm Post subject: Re: E-bus diode |
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For several years I have sold: IXYS DSSX61-0045A with a heatsinks, mounting hardware, shipping and manual. It's a good choice.
Eric M. Jones
PerihelionDesign.com
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Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net |
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teblejw
Joined: 19 Nov 2013
Posts: 14
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| Posted: Mon Dec 30, 2013 8:41 pm Post subject: E-bus diode |
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Of course a higher voltage drop leads to a higher heat generated and, hence, for many of us, the attraction of the Schottky diodes. I've been searching for single diodes to use in a modified version of Bob's new Z-07. I'll have 12-15 amps of current through one diode. I'm wondering about a diode in the ITO-220 case, like
http://www.digikey.com/product-detail/en/VFT4045BP-M3%2F4W/VFT4045BP-M3%2F4W-ND/3102977
With a forward of current of around 0.5V, the power to be thermally accommodated is less than 8W. and many heat sinks are available for the TO-220 configuration. The connections on the TO-220 must be soldered, but I'm less concerned about soldered connections after reading Bob's recent article in Kitplane.
Are there other reasons for rejecting a diode like this?
Tom
[quote]
From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com>
To: aeroelectric-list(at)matronics.com
Sent: Monday, December 30, 2013 9:01 AM
Subject: Re: AeroElectric-List: E-bus diode
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>
At 08:04 PM 12/29/2013, you wrote:
That's a worst case condition which is almost never
realized in the manner in which we use them. Furhter,
as explained in other narratives concerning drops
in the e-bus normal feed diodes, there's no chance
that a diode offers an 'unacceptable' voltage drop.
The normally expected drops in all forms of diode
will produce an alternator-operating e-bus voltage
no less than 13v and probably HIGHER. While operating
the e-bus battery-only, available voltage will be 12.5
volts or LOWER . . . and we expect things to work
just fine at that level too.
Don't get wrapped about the "oh-my-gosh-there's-
a-voltage-drop" axle. It the grand scheme of
things its immaterial. This is why we've offered
and recommended the plain-vanilla, bridge rectifier
with fast-on tabs for nearly 20 years . . . cheap,
easy to mount and you can get the things at
Radio Shack.
Bob . . . sp; * The Builder's Bookstore h href="http://www.mypilotstore.com/" * Race Consulting http  =================
[b]
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nuckolls.bob(at)aeroelect
Guest
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| Posted: Tue Dec 31, 2013 7:11 am Post subject: E-bus diode |
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At 10:39 PM 12/30/2013, you wrote:
Of course a higher voltage drop leads to a higher heat generated
and, hence, for many of us, the attraction of the Schottky diodes.
Yes . . . but how much heat . . . and what's the difference
between the two technologies?
I've been searching for single diodes to use in a modified version
of Bob's new Z-07. I'll have 12-15 amps of current through one diode.
That's a really BIG e-bus load . . . what's your
anticipated alternator-out endurance for
the battery you plan to carry?
I'm wondering about a diode in the ITO-220 case, like
http://www.digikey.com/product-detail/en/VFT4045BP-M3%2F4W/VFT4045BP-M3%2F4W-ND/3102977
With a forward of current of around 0.5V, the power to be thermally
accommodated is less than 8W. and many heat sinks are available for
the TO-220 configuration. The connections on the TO-220 must be
soldered, but I'm less concerned about soldered connections after
reading Bob's recent article in Kitplane.
Heatsink? What's your airplane made of? If there's
a few square inches of aluminum handy . . . why
not simply sink it to the airplane?
Are there other reasons for rejecting a diode like this?
Suggest you sift the premises under which
your procurement study is being conducted.
This diode . . .
http://tinyurl.com/nx5st6p
will carry 15A handily simply bolted down
to local sheet metal . . . but it's my fondest
wish that it never sees even 1/2 that load.
Not because the diode is at risk for overheating
but because the battery is not being well
conserved for alternator-out operations.
Were it my airplane, a high-priority design
goal would be to carry enough battery loaded
so lightly by the e-bus that I could depart,
punch through a cloud layer, suffer a failed
alternator and still comfortably continue flight
to airport of intended destination. The
"e" in e-bus is for ENDURANCE.
Bob . . .
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nuckolls.bob(at)aeroelect
Guest
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| Posted: Tue Dec 31, 2013 8:39 am Post subject: E-bus diode |
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Opps. Stuck foot in mouth when I wrote:
Were it my airplane, a high-priority design goal would be to carry
enough battery loaded
so lightly by the e-bus that I could depart, punch through a cloud
layer, suffer a failed
alternator and still comfortably continue flight to airport of
intended destination. The
"e" in e-bus is for ENDURANCE.
You said Z-07 . . . electrically dependent
engine. Okay, nice fat endurance numbers are simply
not practical for battery-only ops.
Okay, your quest for the "golden diode" is still
no big deal. Suggest you consider the dual, TO-247
package devices, parallel the diodes for improved
thermal resistance and simply mount to the airframe
as suggested in the product literature I cited.
Bob . . .
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teblejw
Joined: 19 Nov 2013
Posts: 14
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| Posted: Tue Dec 31, 2013 10:29 am Post subject: E-bus diode |
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Thanks Bob. Just the kind of advice I was looking for. Glad I didn't rush to respond to you earlier message.
Tom
[quote]
From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com>
To: aeroelectric-list(at)matronics.com
Sent: Tuesday, December 31, 2013 9:38 AM
Subject: Re: E-bus diode
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>
Opps. Stuck foot in mouth when I wrote:
Were it my airplane, a high-priority design goal would be to carry enough battery loaded
so lightly by the e-bus that I could depart, punch through a cloud layer, suffer a failed
alternator and still comfortably continue flight to airport of intended destination. The
"e" in e-bus is for ENDURANCE.
You said Z-07 . . . electrically dependent
engine. Okay, nice fat endurance numbers are simply
not practical for battery-only ops.
Okay, your quest for the "golden diode" is still
no big deal. Suggest you consider the dual, TO-247
package devices, parallel the diodes for improved
thermal resistance and simply mount to the airframe
as suggested in the product literaectric http://ww href="http://www.buildersbooks.com/" target="_blank">http://www.buildeww.homebuilthelp.com/" * My Pilot Store http://www.mrrace.comnbsp; hare, and ========================
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