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Registered Member #1415
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Posts: 21
Hello Everyone, I recently constructed a sgtc that made two foot sparks and decided that I would try to tackle a drsstc. I am relatively new to tesla coils in general. Anways, I have several basic questions. 1. Why does a drsstc primary operate at such a low voltage? (Is it because the igbt's are simply too expensive for higher voltages) 2. Why is it DOUBLY resonant? I understand how the primary and secondary form a resonant circuit, but where is the other resonant circuit. 3. What kind of transfomer is connected between the igbt's and the tesla coils primary?
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
A DRSSTC can have a much higher voltage gain than a regular Tesla coil. Anyway, it's impractical to operate the electronic driver at kV voltages. The primary circuit and the secondary circuit are resonant. The driver is connected directly to the primary circuit. More about "Solid state coils":
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Tucker Jones wrote ...
Hello Everyone, I recently constructed a sgtc that made two foot sparks and decided that I would try to tackle a drsstc. I am relatively new to tesla coils in general. Anways, I have several basic questions. 1. Why does a drsstc primary operate at such a low voltage? (Is it because the igbt's are simply too expensive for higher voltages) 2. Why is it DOUBLY resonant? I understand how the primary and secondary form a resonant circuit, but where is the other resonant circuit. 3. What kind of transfomer is connected between the igbt's and the tesla coils primary?
1. Actually it does and it doesn't. Although the DC bus voltage is 320-640V typically, the actual primary voltage is upwards of 6,000 volts. My small half-bridge DRSSTC running a half-bridge at 320V, develops more than a 5kV ring on the primary during each pulse. Also, DRSSTCs may be somewhat lower in voltage in SGTCs, but it makes it up in primary current. Peak currents upwards of 500A are typical.
2. Double resonant merely means the primary tank circuit is resonant to the resonant frequency as well as the switching frequency of power circuit. Also, contrary to popular belief, double resonant high voltage topology is nothing new, Its been around for more than 50 years and is the SAME EXACT topology used in many high voltage generators. There are also numerous patents on it if you want a bit more explanation on the concept. The only difference is with a Tesla coil, the topology is usually open-loop (although self-resonanting) so no feedback for voltage control, and the output is simply the output arcs rather than rectified for a high voltage.
3. No transformer required. Output of half-bridge is connected directly to primary coil / capacitor.
Registered Member #1415
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So there is no alternating current resonating in the primary. It is only direct current that passes through one end and out the other at the resonant frequency?
Registered Member #180
Joined: Thu Feb 16 2006, 02:12AM
Location: Ontario, Canada
Posts: 187
Someone else will explain it alot better but in a DRSSTC the double resonant part refers to the fact that the primary LC resonates AND so does the secondary. In a normal SSTC there is no primary LC just L, and therefor only the secondary resonates. A DRSSTC has a primary coil and a capacitor (usually MMC), current resonates between these two, as Dr. Shock said they can build huge currents and voltages.
Registered Member #1169
Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251
CT2 wrote ...
Someone else will explain it alot better but in a DRSSTC the double resonant part refers to the fact that the primary LC resonates AND so does the secondary. In a normal SSTC there is no primary LC just L, and therefor only the secondary resonates. A DRSSTC has a primary coil and a capacitor (usually MMC), current resonates between these two, as Dr. Shock said they can build huge currents and voltages.
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DRSSTC help for a beginner
