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Electronics => Projects, Designs, and Technical Stuff => Topic started by: rbola35618 on July 11, 2013, 03:13:13 am

Title: Videos on High Voltage engineering for space applications.
Post by: rbola35618 on July 11, 2013, 03:13:13 am
Hi EEbloggers,

These are comprehensive videos on High Voltage engineering presented by Steve Battel who is a well known designer of space rated power supplies. I hope these will be useful for people interested in doing high voltage design.

Day 1
http://mediaex-server.larc.nasa.gov/Academy/SilverlightPlayer/Default.aspx?peid=ccf8f8da53ad4c99bbfd74b6651922231d (http://mediaex-server.larc.nasa.gov/Academy/SilverlightPlayer/Default.aspx?peid=ccf8f8da53ad4c99bbfd74b6651922231d)

Day 2
http://mediaex-server.larc.nasa.gov/Academy/SilverlightPlayer/Default.aspx?peid=a2bdec72cb224785a122b27b630e543e1d (http://mediaex-server.larc.nasa.gov/Academy/SilverlightPlayer/Default.aspx?peid=a2bdec72cb224785a122b27b630e543e1d)


Robert Bolanos
Title: Re: Videos on High Voltage engineering for space applications.
Post by: Jebnor on July 12, 2013, 04:08:48 am
And there goes my weekend...
Title: Re: Videos on High Voltage engineering for space applications.
Post by: ve7xen on July 12, 2013, 05:53:35 am
Bah, stupid SilverLight.

Moonlight is unmaintained / defunct and I can't be arsed to try to find or build a binary. The source does not have obvious links to the actual media files.

Video looks interesting, if someone can extract a link to something playable...
Title: Re: Videos on High Voltage engineering for space applications.
Post by: Psi on July 12, 2013, 06:01:19 am
yeah, i cant be bothered installing SilverLight either.
Title: Re: Videos on High Voltage engineering for space applications.
Post by: Alexei.Polkhanov on July 14, 2013, 06:12:51 am
Quote from: Psi on July 12, 2013, 06:01:19 am
yeah, i cant be bothered installing SilverLight either.
You guys still using Windows XP or something?

I found slides in PDF format:
http://www.nasa.gov/pdf/684081main_12188C_Revised%20for%20Posting_Battel_HVEngineering_Workshop_DAY2.pdf (http://www.nasa.gov/pdf/684081main_12188C_Revised%20for%20Posting_Battel_HVEngineering_Workshop_DAY2.pdf)
http://www.nasa.gov/pdf/684078main_12188C_Revised%20for%20Posting_Battel_HVEngineering_Workshop_DAY1.pdf (http://www.nasa.gov/pdf/684078main_12188C_Revised%20for%20Posting_Battel_HVEngineering_Workshop_DAY1.pdf)

Interesting thing is ... Google search for "Ruitberg current-fed push-pull oscillator" returns only that PDF. It is not spelled right or that design is from Mars  :-//

Chunks of schematics are very unclear,but some interesting components:
IRHF57234SE RADIATION HARDENED POWER MOSFET 250V, N-CHANNEL THRU-HOLE (TO-39) http://www.chipfind.ru/datasheet/pdf/irf/irhf57234se.pdf (http://www.chipfind.ru/datasheet/pdf/irf/irhf57234se.pdf)
1N5811US MELF package diode http://www.microsemi.com/document-portal/doc_download/124792-lds-0168-1 (http://www.microsemi.com/document-portal/doc_download/124792-lds-0168-1)

Each resistor and capacitor have model number along with value and voltage "2.2uF 50V 10% 87106-249".

and so on.
And why on Earth I would ever use that.    :D
Title: Re: Videos on High Voltage engineering for space applications.
Post by: Alexei.Polkhanov on July 14, 2013, 09:47:21 pm
Does anyone know why many emitters on schematics have what looks like a ferrite bead? "FB" as designator gives it away, see pic below. I mean I know what ferrite beads do but why placing them on almost all emitter pins?
Title: Re: Videos on High Voltage engineering for space applications.
Post by: SeanB on July 15, 2013, 04:17:20 pm
Generally there to stop parasitic oscillation in the transistor. If it has a load that is somewhat inductive it can oscillate on turn on and the beads provide extra impedance to reduce this.
Title: Re: Videos on High Voltage engineering for space applications.
Post by: cthree on July 15, 2013, 08:28:45 pm
SilverLight FTL :(
Title: Re: Videos on High Voltage engineering for space applications.
Post by: ve7xen on July 16, 2013, 03:48:55 am
Quote from: Alexei.Polkhanov on July 14, 2013, 06:12:51 am
You guys still using Windows XP or something?
Haven't used XP in about a decade. I'm on Linux. At one time, Microsoft sponsored the Mono project to port SilverLight as Moonlight, but that project is defunct and I can't find binaries for the old version that exists anywhere, if they'd even work on a modern distro. If someone were to use Chrome or Firefox's developer tab, you can probably see the network request for the actual video URL, which would likely play fine in a normal media player.

Quote
I found slides in PDF format:
Now these I can read. Thanks!
Title: Re: Videos on High Voltage engineering for space applications.
Post by: BravoV on July 16, 2013, 03:53:56 am
Quote from: Alexei.Polkhanov on July 14, 2013, 09:47:21 pm
Does anyone know why many emitters on schematics have what looks like a ferrite bead? "FB" as designator gives it away, see pic below. I mean I know what ferrite beads do but why placing them on almost all emitter pins?

Basics of Ferrite Beads for Filters, EMI Suppression, Parasitic oscillation suppression / Tutorial (https://www.youtube.com/watch?v=81C4IfONt3o#)
Title: Re: Videos on High Voltage engineering for space applications.
Post by: Smokey on July 16, 2013, 05:53:16 am
I actually like the silverlight style presentation for this kind of stuff.  I know you can use other formats, but seriously having the video and the slides synced like that is nice.  The ability to change focus on demand is killer. 
Lectures like that are usually one or the other and it's harder to follow. 

(is that really 8 hours!!! crazy)