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*To*: Tesla Coil Mailing List <tesla@xxxxxxxxxx>*Subject*: Re: [TCML] understanding DRSSTC*From*: Antonio Queiroz <acmdequeiroz@xxxxxxxxx>*Date*: Thu, 14 Feb 2013 19:04:10 -0200*Delivered-to*: teslaarchive@xxxxxxxxxx*Delivered-to*: tesla@xxxxxxxxxx*Dkim-signature*: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:message-id:date:from:user-agent:mime-version:to:subject :references:in-reply-to:content-type:content-transfer-encoding; bh=i/RlMqfRau9ntS9mRlMY7pzOqxXSaRbxnIRaF5CB/nQ=; b=zs0pXIrCaP4bCY7G9NkjoxPAIM7o7xVxduK8uPi+LU3+N5b5EYMiJX2NQ87UVO177R 2Sm16fkZs2W3DP2pic5PF034SfmZPN3iMVGtovLwOjkQokHEPeDCImt09dEfUVtYAc18 9KYboIceTYKRexzuS0C/hzIj7B/Vo1AxTT5+Ze5WUsOuXxmgJEuQDwU4s2uBQ81A7mMv Ogr8fu1bJfY2eWpJnabmrC4w/ZaxynAuvaiphgTClB+F5+lzyfdMcX1u0duMt05mpZBN 5eL+qtfMS+eGvUzbOi90XGraTP8fOBCo+Rqe3BWciwwoXrdih1XPze3UbwW6neWhAb6v TZyQ==*In-reply-to*: <3C00E3E14ABE46E0B58DA6030CC8202F@UdosLaptop>*List-archive*: <http://www.pupman.com/pipermail/tesla>*List-help*: <mailto:tesla-request@pupman.com?subject=help>*List-id*: Tesla Coil Mailing List <tesla.pupman.com>*List-post*: <mailto:tesla@pupman.com>*List-subscribe*: <http://www.pupman.com/mailman/listinfo/tesla>, <mailto:tesla-request@pupman.com?subject=subscribe>*List-unsubscribe*: <http://www.pupman.com/mailman/listinfo/tesla>, <mailto:tesla-request@pupman.com?subject=unsubscribe>*References*: <510781E7.22222.26F033@xxxxxxxxxxxxxxxxxxxxx>, <AA15AC9F78E74F4BB90E4A656780F965@UdosLaptop><51175855.6319.ABCD7@xxxxxxxxxxxxxxxxxxxxx><5117FA4D.9000708@xxxxxxxxx><B3EC473009924A27960726D175D02CAE@UdosLaptop> <511AC087.1040709@xxxxxxxxx> <3C00E3E14ABE46E0B58DA6030CC8202F@UdosLaptop>*Reply-to*: Tesla Coil Mailing List <tesla@xxxxxxxxxx>*Sender*: tesla-bounces@xxxxxxxxxx*User-agent*: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130107 Thunderbird/17.0.2

In 14/02/2013 07:18, Udo Lenz wrote:

Hi Antonio,But this system has two resonances. Looking at the frequency responseof the system, what I see is:At the poles the input impedance is never purely resistive, and ispurely reactive in the unloaded case,inductive above and capacitive below.At the central frequency the input impedance is purely resistive,with any resitive load at the output.Greater load widens the frequency range where the input impedance isapproximately resistive.I agree. I've carelessly equated the terms "pole frequency" and "ZCSfrequency".As you have shown, they are not identical.. You should be able to runa coilwith ZCS (i.e.the input being purely resistive) in the vicinity of thepole frequencies.

The center frequency at light loads and the central frequency at largeloadshave different properties. The first one will be more inductive belowit and morecapacitive above. The latter one is the other way around, behavinglike a pole.So the frequency with the first behaviour does not exist anymore atlarge loads.A PLL, which corrects the frequency according to the phase betweenprimary current andvoltage can only lock onto one of these frequencies. It will be drivenaway from the other one.

operate at a pole frequency, because both pole frequencies areidentical, at the central frequency(with different Qs).If you are using a PLL, compare the frequency where it operates atthe end of a long burstwith arc load with the two pole frequencies of the unloaded system.It's true that arc load addscapacitance to the secondary and changes the tuning of the system, soI would expect the finalfrequency to be somewhere below the central frequency. Or you canoperate the system withsmall arcs, so the unloaded tuning is preserved.In the case of a heavily loaded system with only a single ZCSfrequency, thisfrequency will be close to the primary resonant frequency. The secondaryresonance will be wide at this point, as you have stated above, sothat the valueof that frequency will not matter as much as in the lightly loaded case.

I agree. I have updated my document, with some frequency response curves: http://www.coe.ufrj.br/~acmq/tesla/drsstcexcitation.pdf

everything is approximately linear. Antonio Carlos M. de Queiroz _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla

**References**:**Re: [TCML] understanding DRSSTC***From:*Udo Lenz

**Re: [TCML] understanding DRSSTC***From:*Herwig Roscher

**Re: [TCML] understanding DRSSTC***From:*Antonio Queiroz

**Re: [TCML] understanding DRSSTC***From:*Udo Lenz

**Re: [TCML] understanding DRSSTC***From:*Antonio Queiroz

**Re: [TCML] understanding DRSSTC***From:*Udo Lenz

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