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Registered Member #2922
Joined: Sun Jun 13 2010, 12:08AM
Location:
Posts: 226
1 - Yes, in a OLTC you drive the tank at the "bps frequency" 2 - You can first make a simple 555 driver for low power tests. In the future you make a more advanced driver with CT and flip-flop to syncrhonize the zero crossing. 3 - You need a big capacitor, very big! like 3 or 4uF, or more.. I really don't know if motor capacitors will work.. 4 - Yes, a BJT at very high currents is more dificult to drive. I think is better you use a pair of complementar mosfet, like IRF540 / IRF9540 to drive a 2:1 GDT, with 60v at primary. It will give you a good current at the base.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Well a BJT does require more current, but it is not more difficult necessarily. Also, a GDT is not required, and if you did use a GDT, you would need a core that would give a good clean square wave at the driver's frequency (something like 1hz-1khz). A totem pole of mosfets or BJTs connected directly to the gate would work. Isolation is not required when using one transistor.
Also, a 555 would work for more than just low power, but it would not be as reliable as as more complex driver. All the transistor has to do is connect the tank capacitor in parallel with the primary, and it will resonate. Other drivers, however, have controlled quenching and things like that which make the transistor happier and more reliable.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
The only pracitcal use I can think of for it would be a linear audiomodulator for a SSTC. You would need better than that little heatsink for sure if you want to push it's full power rating, water cooling would likely be in order.
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