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Which DC Drive?
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From: Steve Young [SMTP:youngs-at-konnections-dot-com]
Sent: Saturday, June 06, 1998 10:31 PM
To: Tesla List
Subject: Which DC Drive?
To DC TC Enthusiasts:
I am designing a DC powered 6 inch TC. DC supply initially will be two
MOTs, each with two half-wave voltage doublers, these in series for about
10 KV total output. Output filter cap is about .5 mfd. Primary cap will
be .02 - .03 mfd.
I know of two ways to drive the TC primary (protective filters, etc. not
shown):
1) Charging Reactor (Greg Leyh style):
Supply + -- Charging Reactor -- Cap -- 0
| 0
o 0
RSG o 0 Primary
o 0
| 0
Supply - ------------------------------0
2) Polarity-reversing RSG (Larry Robertson style):
Supply + -----------------------------------------
| |
o o
o Gap 1 Gap 2 o
| Primary |
|------ Cap ---- 0 0 0 0 0 0 ---------
| |
o o
o Gap 4 Gap 3 o
| |
Supply - ----------------------------------------
The gaps are a RSG wherein gaps 1 & 3 fire, then 2 & 4 fire, repeatedly.
Questions: 1) What are the pros and cons of each method as far as
efficiency,
protection of the DC Supply, Primary Cap voltage rating, etc.?
2) What are the rules-of-thumb for sizing the charging reactor as far as
inductance, peak voltage it must handle, etc. for a given DC supply? I was
planning to use a
couple of MOT secondaries in series--will that work OK?
3) I would be interested in coilers' experiences with much less than
Electrum-sized DC supplied TCs. Seems like the advantages of independent
power and break rate control and probably more controlled and analyzable
operation would attract more coilers than I have seen mentioned on this
list.
Thanks for your help in advance,
--Steve