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Re: [TCML] DC Coils

Hi Carlos,
The de-queing diode is essential whenever your actual break rate is lower than the maximum rate allowed by the series inductor. The de-queing diode prevents reverse current flow through the inductor and back to the DC supply cap. If you do not include the de-queing diode or if you have a shorted de-queing diode, and use a relatively low break rate, your tank cap to initially charge to 2*Vcc (in 2 msec - 500 BPS), but the tank cap and series inductor will continue to ring, dropping your tank cap voltage (to ground in the worst case!) before the next gap presentation occurs. A defective de-queing diode could explain why your system seems to operate as though the tank voltage was ~Vcc or so. 

Bert

lightningfor@xxxxxxxxxxxxxxxxxxxxxx wrote:

Hi Finn,
I am using a 3 phase supply so on theory I should not need one...  But
because I like to play things safe, YES, I also placed another diode in
serries with the inductor between the power supply and inductor.
Admittedly, the max break rate that the inductor was calculated for was
about 500-600bps and I am only currently running 180bps, but in theory with
the de qing diode this should not be a problem...?   Is that correct?

Carlos

On Thu, 12 Jan 2012 18:03:07 +0100, Finn Hammer<f-h@xxxx>  wrote:

Carlos, all

I think Carlos, referring to voltage being doubled, is talking about the
DC resonant voltage doubling of the tank cap, due to energy stored in

the

charging inductor during the time the gap is conducting.
This requires a blocking diode between the cap and the inductor, also
called the de-qing diode.

Carlos, can you confirm that such a diode is in position?

Cheers, Finn Hammer


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