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*To*: Tesla Coil Mailing List <tesla@xxxxxxxxxx>*Subject*: Re: [TCML] understanding DRSSTC*From*: Steve Ward <steve.ward@xxxxxxxxx>*Date*: Tue, 5 Feb 2013 15:37:35 -0600*Delivered-to*: teslaarchive@xxxxxxxxxx*Delivered-to*: tesla@xxxxxxxxxx*Dkim-signature*: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:content-type; bh=bpsyPpbHuYSsJ4QzJWNP5ir7q2zLPKcSoK6RBf0A/CI=; b=mobvt2no8MeIpVe0+lX5KbyLf1BZBfWNzKeuNtZYPhcpXsG1WiWbu1JZO5CMUUuqrL apMA4gP7HprHOhe5jyObLiuhP96KMX18Qp0j+hzQLmbwfxCqZBeyXtxf3yC71qBcnTeb nVUaIUko3sZt7HwocYyQm0meh1vlZ8Vff5stBCJZ+dJlxYoxHfuNKt5i0VrlMGvVqmiE 941Rq3KzA9aTC3lZwA/DNUABJ0eqWW7HZBtGW9KO3NcUsQoeJz6L5bosqAbsPkTTLkY3 KAn2Dvct0Ug9dKpSD0W6+TO8fHwKeLl5zOSihNbR7m0FCclca9SP2xgv4ycDTI1JJNXY BigQ==*In-reply-to*: <510BD380.4806.72FD8F@xxxxxxxxxxxxxxxxxxxxx>*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> <510A337A.6604.316459@xxxxxxxxxxxxxxxxxxxxx> <CAD=yrfmXBVMi=d8EkOo3_iTTJJcWGmqBCZy-xN0JCoA0aMo5Yw@xxxxxxxxxxxxxx> <510BD380.4806.72FD8F@xxxxxxxxxxxxxxxxxxxxx>*Reply-to*: Tesla Coil Mailing List <tesla@xxxxxxxxxx>*Sender*: tesla-bounces@xxxxxxxxxx

On Feb 1, 2013 8:40 AM, "Herwig Roscher" <herwig.roscher@xxxxxx> wrote: > > > Steve, > > Thank you so much for sharing your insights. > > Checking whether I got it correctly: > > 1. Unlike standard LC-oscillators having a light coupling coefficient and running at a > single frequency, DRSSTCs have a tight coupling and run at two frequencies > simultaneously. Im not sure what exactly you mean by "standard lc oscillators" but this phenomena of 2 pole frequencies comes about with any doubly resonant configuration. The coupling factor determines how far apart these frequencies split apart so low k along with low Q can trick you by looking like a single frequency. When operating at the upper pole the coils have current in opposing phase so the secondary field is cancelling the primary field which makes the inductance look smaller so it rings faster. At the lower pole the coils are in phase so the mutual inductance adds with the primary inductance making it look even bigger so it rings slower. > > 2. If the primary circuit is tuned slightly below the natural frequency of the secondary > circuit, its "hump" becomes bigger than that of the secondary circuit and the circuit > runs at the lower pole frequency mainly. > You can also tune the primary just above the secondary resonance and it will make the upper pole response bigger. > 3. The lower the primary is tuned, the bigger its hump becomes and the more energy it > gets. Tuning lower and lower is limited by starting racing sparks of course. Well i think you've touched on an interesting point. Tuning can greatly change the behavior of the tesla coil under streamer loading. If the primary is tuned very low then the voltage gain of the system could continue to rise as the streamer grows and puts the secondary in tune. If the impedance of the system is too great then you would actually observe a collapse in primary current as the streamer clamps the maximum voltage that the coils can ring up to. If the system impedance is still low enough that driving the spark is not limiting system Q by too much, then the coil will simply go out of tune and voltage gain will be limited by impedance once again . Ground discharge behavior can be quite different depending on tuning. I think the lower pole dominant tuning makes the system build to higher levels of current as the impedance of the secondary looks lower at a lower frequency (inductive loading). If the primary is tuned for upper pole operation then the secondary will be driven at a higher frequency because the higher primary tuning and so the secondary impedance could potentially limit the current more. How you exploit these tuning options seems to be the hard part. Steve > Are these assumptions true? > > Kind regards, > > Herwig > > > _______________________________________________ > Tesla mailing list > Tesla@xxxxxxxxxx > http://www.pupman.com/mailman/listinfo/tesla _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla

**Follow-Ups**:**Re: [TCML] understanding DRSSTC***From:*Herwig Roscher

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

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

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