[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: A real quarter wave TC ?
Original poster: "Gerry Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
Hi Skip,
The line resonant cap for your transformer is 35 nf. If you operate
at resonance with a SRSG, bad things will happen to your NST and
Caps. For SRSG at 120BPS you will need around 2.8 * Cres (99 nf for
your case). This is to make the charging work without getting
excessive voltage on the TC primary (independent of the TC primary
and secondary design). Needed Cp value is a function of your power
source, spark gap type, and presentation rate in case of SRSG.
With a 99nf tank cap. and a two turn TC primary, you will need to
make sure your surge current is not too high for your MMC. Ipeak and
Irms are also important design factors for a reliable MMC.
Ip_max = Vp_fire / sqrt (Lp/Cp)
If this is a problem area and you need to add more primary turns and
lower the resonant frequency even more, you can add a top load and/or
add more turns onto the secondary.
I dont know what your objectives are for such a high frequency and
low number of secondary turns given the large diameters of the coils,
but if those parameters are important, you may need to reduce your
power levels.
Gerry R.
Original poster: Skip Greiner <skipg@xxxxxxxxxxxxxxx>
Hi All
I am considering building a TC with the following specs and would
appreciate any comments
Secondary: 83 turns #16 ga wire on a 45" diameter by 24" high form
Primary: 2 turns of .375 copper tubing about 50" in diameter
NST: 9000@120 ma
Cap: .035
Units??? I assumed you meant 0.035 uf
Synchronous 4 pole RSG
Note that both primary and secondary are resonant at about 250khz.
The secondary will not have a top load.
Thanks in advance for all comments
Skip