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Thread: Argon Toshiba LHI-106D

  1. #11
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    Ok, that plasma tube has a 90 to 106 volt drop across it and runs best at between 3.5 and 9 amperes of plasma current. The cathode transformer is 2.7 volts at 25-35 amperes. The cathode transformer must have a center tap for the plasma current. As you are in a nation with 250 volt line service the power supply must some how drop about 140 volts while running a constant current of 3.5 to 10 amperes.

    Wedding rehearsal, wedding service, and wedding reception done. Bride and groom are very happy, Sound system worked flawlessly and they were very happy with my DJ and mixing skills. So now I can get back to academics and lasers.

    Data and and schematics to follow in the morning after Church.

    Steve
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  2. #12
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    Quote Originally Posted by mixedgas View Post
    Ok, that plasma tube has a 90 to 106 volt drop across it and runs best at between 3.5 and 9 amperes of plasma current. The cathode transformer is 2.7 volts at 25-35 amperes. The cathode transformer must have a center tap for the plasma current. As you are in a nation with 250 volt line service the power supply must some how drop about 140 volts while running a constant current of 3.5 to 10 amperes.

    Wedding rehearsal, wedding service, and wedding reception done. Bride and groom are very happy, Sound system worked flawlessly and they were very happy with my DJ and mixing skills. So now I can get back to academics and lasers.

    Data and and schematics to follow in the morning after Church.

    Steve
    Wow, thanks a lot! It really making clear a theoretical look over how to plan a custom PSU for it. And will be awesome to see the extra data and schematics you told before and what you think about all of this project!
    Btw it's always a joy to see how ppl feel happy at their wedding And be a part of it, the maestro of fun and mood!
    Best regards,
    Linda

    Discord: Linda#7591

  3. #13
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    Can you locate a 1 to 2 Kilowatt Stepdown transformer from 250VAC to 110VAC ? If so, a regulated linear power supply becomes very simple.

    Steve
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  4. #14
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    The domestic US and Japan Toshiba power supplies were very similar to this non-switching analog model. See attached.. It has a few more parts then needed, including constant laser output power mode.

    Steve
    Attached Thumbnails Attached Thumbnails SP262a.jpg  

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  5. #15
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    Can you locate a 1 to 2 Kilowatt Stepdown transformer from 250VAC to 110VAC ? If so, a regulated linear power supply becomes very simple. You need some sort of pre-regulator to have around 120-140 VDC across the tube and regulating element. Without a current regulating element the tube will destroy itself.

    Alternatives if no transformer become:

    1. Switching Power Supply as pre-regulator using IGBT or MosFET
    2. SCR / Thyristor as pre-regulator into capacitive filter bank with series choke. Ie Phase Angle Controller
    3. High Power Ballast resistor as "front end" current limiting. Not recommended due to plasma instability that can destroy a laser tube.

    Steve
    Last edited by mixedgas; 05-24-2021 at 15:08.
    Qui habet Christos, habet Vitam!
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  6. #16
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    Quote Originally Posted by mixedgas View Post
    The domestic US and Japan Toshiba power supplies were very similar to this non-switching analog model. See attached.. It has a few more parts then needed, including constant laser output power mode.

    Steve
    Oh my god! Its looks pretty complex XD Much more complex than a scheme I have planned before... But it shows how they want it to work.

    Quote Originally Posted by mixedgas
    Can you locate a 1 to 2 Kilowatt Stepdown transformer from 250VAC to 110VAC ? If so, a regulated linear power supply becomes very simple. You need some sort of pre-regulator to have around 120-140 VDC across the tube and regulating element. Without a current regulating element the tube will destroy itself.

    Alternatives if no transformer become:

    1. Switching Power Supply as pre-regulator using IGBT or MosFET
    2. SCR / Thyristor as pre-regulator into capacitive filter bank with series choke. Ie Phase Angle Controller
    3. High Power Ballast resistor as "front end" current limiting. Not recommended due to plasma instability that can destroy a laser tube.

    Steve
    Yeah i think before about it when investigating the Lexel and ALC60 PSUs. I had an idea to use a 2 rewinded (to 250/110) MOT-transformers set in paralel with equalizer to have a 2kW output:
    Click image for larger version. 

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    the nominals are random XD

    Click image for larger version. 

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    Diodes will be protected by caps for sure.

    Will it works?


    The small one are in WIP for the filament one:
    Click image for larger version. 

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    He was a good boy before meet the noseless figure with a scythe... Now I try to let him breath again as the filament transformer for my argon tube.


    Quote Originally Posted by mixedgas

    I'm working sound on a friend's wedding rehearsal.
    I'll get back to you as soon as possible. I have the Toshiba AO drivers and a multitude of ways of generating
    What about the AOM? Does my one can be usefull for me?
    Best regards,
    Linda

    Discord: Linda#7591

  7. #17
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    Quote Originally Posted by Methelina View Post
    Oh my god! Its looks pretty complex XD Much more complex than a scheme I have planned before... But it shows how they want it to work.



    Yeah i think before about it when investigating the Lexel and ALC60 PSUs. I had an idea to use a 2 rewinded (to 250/110) MOT-transformers set in paralel with equalizer to have a 2kW output:
    Click image for larger version. 

Name:	T7swV28.gif 
Views:	3 
Size:	1.10 MB 
ID:	58023
    the nominals are random XD

    Click image for larger version. 

Name:	p5xnq0X.png 
Views:	25 
Size:	10.4 KB 
ID:	58024
    Diodes will be protected by caps for sure.

    Will it works?


    The small one are in WIP for the filament one:
    Click image for larger version. 

Name:	vj92C78.png 
Views:	2 
Size:	984.7 KB 
ID:	58025 Click image for larger version. 

Name:	5t6VNoK.png 
Views:	3 
Size:	794.8 KB 
ID:	58026
    He was a good boy before meet the noseless figure with a scythe... Now I try to let him breath again as the filament transformer for my argon tube.




    What about the AOM? Does my one can be usefull for me?
    good to see someone can match my dirty workbench! Without the crystals the aom driver is nothing more than an oscillator.

  8. #18
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    Quote Originally Posted by kecked View Post
    good to see someone can match my dirty workbench! Without the crystals the aom driver is nothing more than an oscillator.
    Hmm, how this crystals looks alike?
    Best regards,
    Linda

    Discord: Linda#7591

  9. #19
    mixedgas's Avatar
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    I can get it down to 3 small transistors, four large transistors and an op-amp if you don't mind water cooling the passbank...

    "HE" is complex due to low optical noise requirements and a desire for no repairs in 20 years of operation.

    Steve
    Qui habet Christos, habet Vitam!
    I should have rented the space under my name for advertising.
    When I still could have...

  10. #20
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    This guy could give you a run for messy work shop...
    Click image for larger version. 

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ID:	58027
    "There are painters who transform the sun into a yellow spot, but there are others who, with the help of their art and their intelligence, transform a yellow spot into the sun." Pablo Picasso

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