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Anodized Aluminum Profile: Mounting 4 Thyristors Safely, Heat Sink, Short Circuit Prevention

hetm4n 5109 13
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
  • #1 16182085
    hetm4n
    Level 20  
    Hello! I want to screw 4 thyristors to the anodized aluminum profile. As you know, the anode coating is non-conductive. On the other hand, thyristors have their heat sink connected internally with the thyristor anode. The electronics board is made in such a way that the anodes control the outputs and I cannot short them to a common one. Is it possible to screw these thyristors to the common profile without fear of a short circuit between the thyristor signals without mica / silicone washers, or to provide washers?
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  • #2 16182117
    kokapetyl
    Level 43  
    traax wrote:
    Is it possible without fear of a short circuit between the signals from the thyristor without shims?

    No.
    You need to provide washers, if screwed on the screw, then additionally an insulating sleeve on it.
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  • #3 16182120
    Anonymous
    Level 1  
  • Helpful post
    #4 16182123
    viayner
    Level 43  
    Hello,
    aluminum oxide layer has significantly worse conductivity than pure aluminum, but what thickness are we talking about here? usually several dozen um. Is it enough for simple logic?
    Make a simple test, mount the thyristors and check with an ohmmeter, it's only a few V and I think you will switch hundreds of V so the conclusions are rather simple.
    Anodized / Surface Oxidized or Entire Profile? and micro scratches when screwing, etc.
    greetings
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    #5 16182279
    Anonymous
    Level 1  
  • #6 16182493
    Anonymous
    Level 1  
  • #7 16182978
    hetm4n
    Level 20  
    A current of max 1A, voltage 12V will pass through the thyristors.
  • #8 16182989
    kokapetyl
    Level 43  
    traax wrote:
    A current of max 1A, voltage 12V will pass through the thyristors.

    I don't think anyone is interested.
    You already got the answer, insulation + insulating sleeves.
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  • #9 16183177
    Anonymous
    Level 1  
  • Helpful post
    #10 16183593
    _jta_
    Electronics specialist
    Aluminum oxide can withstand voltages of up to hundreds of V (in electrolytic capacitors), but for this there must be very clean aluminum, an appropriate production technique, and a specific voltage sign (+ on aluminum) - for the oxide produced on the surface of technical aluminum, a pair of V voltage and a little moisture (and even on a clean one, but with tension in the opposite direction) is enough for it to quickly lose its insulating properties; insulating washers are much thicker than the oxide layer obtained by anodizing.
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  • #11 16184208
    hetm4n
    Level 20  
    Thyristors are TIC106D, but in this small housing without a protruding heat sink, sleeves are unnecessary for them because the hole is insulated. I have them loose on the cables, so you need to screw them on to something, and the housing is made of anodized Bosch rexroth aluminum profile, so I wonder about this conduction.
  • Helpful post
    #12 16184300
    Anonymous
    Level 1  
  • Helpful post
    #13 16184635
    cooltygrysek
    Conditionally unlocked
    My friend probably has the C106D version in the TO 225 housing, the same as the TIC 106D in the TO220 housing. It could have come from the fact that the casing is written C106D and a friend could associate that it is TIC 106D and probably when googling it jumped out.
  • #14 16184895
    hetm4n
    Level 20  
    Ok. Thank you for the information. greetings :)

Topic summary

The discussion centers on the safe mounting of four thyristors to an anodized aluminum profile, addressing concerns about the non-conductive nature of the anodized layer and the risk of short circuits. Participants emphasize the necessity of using insulating washers or sleeves to prevent potential breakdown due to the thin oxide layer and uneven surfaces of the thyristors. The specific thyristor model mentioned is TIC106D, which is noted to have a non-insulated hole in its TO-220 housing. The conversation highlights the importance of ensuring proper insulation to avoid electrical failures, despite the anodized aluminum's thermal conductivity advantages.
Summary generated by the language model.
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