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  1. #1
    Seedling Egzoset's Avatar

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    Lightbulb DynaVap IH-drive fix

    Salutations,

    Tired of conductive heat solutions??

    Think KISS design and look again:

    Click image for larger version. 

Name:	Egzoset's LAVAGen2 IH-Driven Heat Convertor concept (2019-Mar-28) [700x480] .PNG 
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    [ https:// i.postimg.cc/bwXqk20c/Egzoset-s-idea-of-some-IH-Driven-Heat-Convertor-2019-Mar-28-7.png ]

    [ http:// oi63.tinypic.com/14y4uma.jpg ]


    Just imagine a spiral trench carved on the outer surface of that metal tube, with a CCD Screen on the far left side, in the middle of a path to the SiC puck...

    It may work with the Loto labs Evoke/Lux too and even better with a Dr. Dabber Switch i predict.

    Good day, have fun!!
    http://www.jango.com/profiles/44436821

  2. #2
    Seedling Egzoset's Avatar

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    Lightbulb

    UPDATE:




    So... It's about time i think of completing my modest contribution finally!


    Apparently some 3rd-party ready-made commercially-available IH-drivers have been found to share a same common symptom - and still do: unstable gates in power stages can cause forbiden conditions as a "shot-thru" lockup, which occurs because "ringing" is allowed to take place by design, willing to circumvent the problem using a temporary fix (eventually turned permanent...) while leaving its cause in place for some obscure motives still eluding me at the moment. It may seem acceptable for those ready to trade reliability in exchange for portability but i find that's a far stretch in A.C. powered units nonetheless. As a matter of fact it's not recent at all, a couple hours of Google Search will confirm this was even a popular topic before 2010, when alternatives to the over-simplified Mazilli/Royer oscillator started to appear, by the way. Consequently, although it's fine to get an exploratory phase there are crucial lessons to retain from those who walked the path and made such precious legacy openly accessible to posterity, for example:





    Please pay special attention to the dates!


    So, the technology has evolved and the guys wanting to melt metal tried their best to tweek it to perfection, while others got obviously stalled making circles around the Maxilli modules ever since - for years literally. Eventually the cannabis vaporists should find solid IH-driver solutions on the market by now, instead we have legacies awaiting to be re-discovered despite general indifference! One of those old posts causing me to day-dream in particular:



    [ http:// inductionheatertutorial.com/inductionheater/induction7.html ]
    Induction Heater Tutorial - 10kw and 3kw

    « Now, we are ready to talk about the phase locked loop chip - the HEF4046. After this discussion, we will have enough information to understand the workings of the inverter and how it maintains a lock on the resonance. »



    Apparently one magic "KeyWord" is PLL:



    [ https:// www.google.com/search?q=PLL+ZVS+%22Quasi-Resonant%22+%22Induction+Heat%22&tbm=isch ]
    Google Images: PLL ZVS "Quasi-Resonant" "Induction Heat"


    Then boom! Something viable to chew on at last (this is my edited version of it...):





    Actually i think it also inspired others:



    [ https:// highvoltageforum.net/index.php?topic=116.msg724#msg724 ]
    Adventures in induction heating (2017-Aug-24)



    It might feel excessive to go into further details except to argue that similar effort to address a decade-old problem comes with rewards denied to paying customers who didn't get all the explanations it seems...

    In any case if PLL + ZVS is the remedy then i'll have to use it ultimately, the sooner the better i shall add!


    ...


    Good day, have fun!!
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Resonant Frequency vs Temperature by Irshad Khan (Y2K) [520x340] .PNG 
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Name:	MOSFET Induction Heater (p1) - Commented by Egzoset - Jonathan Kraidin (2010-Jan-1) [800x600] .PNG 
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    Last edited by Egzoset; 07-08-2020 at 07:28 AM. Reason: On-Line Parser destroyed text format...
    http://www.jango.com/profiles/44436821

  3. #3
    Seedling Egzoset's Avatar

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    Lightbulb

    More update:




    Using some "magic" keywords i eventually obtained from Google that it shows me something which might at least partly fit the "mystery box" in my previous post:




    According to its corresponding schematic and the next one below it's quite possible and apparently even convenient to take full advantage of a "555" type of timer which is integrated right onto the IR2153/IRS2153 chip itself:



    [ https:// www.elettroamici.org/en/uso-ed-abuso-del-ir2153/ ]
    Use and misuse of the IR2153 for feeders up to 1.5KW


    A few tricks may actually pave the way to some stabilisation loop and why not a PLL one, just as previously suggested i figure! Etc., etc...

    Suffice to say there's a lot more stuff which occured past the popular Mazzilli module, since over a decade ago.

    Good day, have fun!!
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Electronics Lab - High Voltage-Current Half Bridge Driver Using IR2153 & IGBT [800x360] .PNG 
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ID:	61011   Click image for larger version. 

Name:	Elettro Amici - iR2153 Schema 2 [800x546] .PNG 
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    http://www.jango.com/profiles/44436821

  4. #4
    Seedling Egzoset's Avatar

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    Lightbulb

    Getting closer...






    Either one wants to risk verify that the Mazzilli topology will end up destroying its power stage (unless it's corrected, if possible...), eventually, either one drops it altogether after paying due attention to "feedback interlock" problem(s) reported by multiple sources. For example:


    [ https:// forum.allaboutcircuits.com/threads/induction-heater-by-mosfet-irfn-260.163638/page-2#post-1440650]
    Induction heater by MOSFET IRFN 260 (2019-Oct-6)


    [ https:// docplayer.net/26964431-High-voltage-resonant-self-tracking-current-fed-converter-a-thesis-presented-to-the-faculty-of-california-polytechnic-state-university.html]




    High voltage resonant self-tracking current-fed converter (2010-Mar), p52/152...


    Briefly put just get rid of Mazzilli's cross-connected diodes and consider preparing to adopt dedicated Gate Drivers instead:





    Better yet, pave the way to a PLL setup by separating the opto-couplers so these simultaneously provide "Interlock" safety on top of phase/frequency signaling, either for a 4046 or perhaps even synthetic (Linux) Software Defined Radio... In any case i'm done dealing with ghosts in a machine!

    Good day, have fun!!
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Interlock Safety idea for Mazzilli ZVS by Egzoset (2020-Jul-24) [640x400] .PNG 
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ID:	61013   Click image for larger version. 

Name:	Interlock Safety WITHOUT Mazzilli ZVS - by Egzoset (2020-Jul-24) [640x400] .PNG 
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ID:	61014  
    http://www.jango.com/profiles/44436821

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