Resource links on Mazzilli's "ZVS" topology & alternatives.

Discussion in 'Vaporizers' started by Egzoset, Nov 26, 2020.

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  1. #1 Egzoset, Nov 26, 2020
    Last edited: Nov 26, 2020
    Salutations,

    This is intended for anyone curious about Mazzilli's legacy, so lets start with his field of expertise around 2008 ~ 2009, presumably as "R&D Electrical Technician" at Riello UPS i guess:


    Actually this "Royer ZVS" author created at least 2 FaceBook accounts, that one registered to "Vladi" being by far his most active contribution:


    And here's some former publicly-accessible e-Mail address, no idea if it's still valid:

    { mazvla @ iol dot it }​

    In addition please take note that George H. Royer patented his circuit in 1954, on November 28 to be exact:

    [ https:// patents.google.com/patent/US2783384A/en ]
    US-2783384-A · Electrical inverter circuits​

    Hence it seems obvious to me like Vladimiro Mazzilli wasn't even born at that time, which should give a better perspective on the whole timeline, one other interesting detail being that Mazzilli himself prefered to call his circuit adaptation a "Royer ZVS":


    It's always refering to some "Flyback Transformer" configured either with a single primary or a center-taped one, with the workcoil as secondary circuit in presence of a flux-concentrating core in BOTH versions - e.g. NOT just some dirt-cheap air-core coil made of a few turns only...

    That video seems perfectly coherent with Mazzilli's later Tesla Coils:


    [ https:// www.youtube.com/watch?v=Udxe0nbVnTE ]
    YouTube: Mazzilli DRSSTC (2010-Oct-12)​

    Which still clearly suggests all his transformers shared a common feature: more than just a few turns of single air-core selenoïd...

    Followed by further confirmation in pictures:

    [ https:// www.pupman.com/current/vladi/vladmap.htm ]
    Mazzilli Vladimiro's Tesla Coil images​

    In addition lets have a look at the multiple reviews/revisions that emerged next, starting with that of Bob Nash (Kibler), or Jakub Tejiščák & Jan Martis, or a favourite of mine as by Jörg Rehrmann (joretronik.de) as i find this most inspiring for many reasons:


    Then lets not forget the "Fast ZVS Mazzilli Driver" of Francisco Piernas Diaz which by the way should consequently be attributed to Royer instead... But it appears much simpler to simply reject i/o analog feed-back loops and rely on dedicated gate-driving chips like Infineon's iR2110/iR2153, used by Oleg Kutkov for his "Powerful DC motor driver", or Dany K.'s (cz) "Induction Heating".

    Last but not least there's even been a scholar thesis where Mazzilli's topology is closely examined:


    Similar to more highly-educated input as from this most enlightning "Master-of-Science" complement:

    [ http:// webfiles.portal.chalmers.se/et/MSc/Christian%20Andersson.pdf ]
    Design of a 2.5kW DC/DC Fullbridge Converter

    Fig. 2.13 -- Inductor core and eq. electrical circuit

    « Snubbers...
    ...
    • Reduce or eliminate voltage and current spikes
    • Limit dI/dt or dV/dt
    • Shape the load line to keep it within the safe operating area (SOA)
    • Transfer power dissipation from the switch to a resistor
    • Reduce total losses due to switching
    • Reduce EMI by damping voltage and current ringing »
    ​

    So lets conclude with a couple more relevant contributions though with somewhat less intimidating titles/origins:

    [ https:// www.ijsr.in/upload/1558894475Chapter_25.pdf ]
    Load identification and protection of iGBT power switch systems for induction heating​

    Now lets pay special attention to this one that was suggesting a nice/elegant solution to the switchless management of workload insertion/removal, based on the Curie effect (vs frequency):

    Sounds like Déjà Vu?...

    ;)

    In any case beware of quite probable impostures, for example:


    A potential case of mis-representation!! :huh:

    Well, if at least i could have been this properly informed a decade ago when MagicFlight replied kind of late to my initial/insisting 2010 posts on cooktop hacks as IH drivers:

    [​IMG]
    [ https:// i.postimg.cc/NjkXy2yz/Magic-Flight-replying-to-Egzoset-on-FC-2011-Nov-16-768x525.png ]
    FuckCombustion: Induction Vaporizer (based on "Curie" alloys)

    « We gave up on the concept... ... ...such systems tend to be very complex to build and are somewhat "fussy"... »​

    Years after Mazzilli's topology fueled Tesla Coil discussions, many more before his very same "Royer ZVS" circuit got practically imposed by pretty much the same type of people using similar communication skills.

    Meanwhile the rest of the world continued to evolve:

    Which paves the way to a vast range of future experimentations guided by rational reasoning instead of fanboyism, and i like such brilliant prospect much better:


    Not to mention real engineers already push true progress a lot forward, i'm thinking more specifically of "smart" GaN power chips designed and optimized for low-voltage portable battery-operated applications:


    Besides more work being performed on hybrid structures, namely "Transphorm GaN Power Switches"...

    Etc., etc.

    While an increasing number of Tesla Coil enthousiasts will rather switch to "musical plama" anyway!


    Good day, have fun!! :D
     

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