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Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
Steve Conner wrote ...
Also, in the recent thread on MKP vs MKT capacitors, we discussed the need for a DC block capacitor even if you don't use a resonant capacitor.
Just for clarification though- NOT for a drsstc! In a dr, just the primary coil and the resonant cap. A dc blocking cap is only used in non resonant systems to avoid catastrophic failure!
What Steve means by this though is that had you made this system a sstc, you still would have needed a primary cap of some sort.
Registered Member #3964
Joined: Thu Jun 23 2011, 03:23AM
Location: Valenzuela City
Posts: 332
hsieh wrote ...
I'm trying to build this coil.After I finished my PCB I want to know if it works or not.I remember that someone on this forum says that a DRSSTC circuit without a resonant capacitor is just a conventional SSTC.So I didn't solder a capacitor and solder a wire instead.
But when I power it up,I cannot see any spark and my variac makes a weird sound.and the insulation of that wire melt.It can light up fluorescent lamp.I tried to change phasing by swap two gate driver chips because everything else is soldered on the PCB.But the fluorescent lamp seems to get darker. What's wrong?
I use 47N60C3 MOSFET (datasheet:
secondary resonant frequency is 617KHz(I know this might be too high but I don't like big secondaries)
thanks
Hi Hsieh,
First of all, feedbacking from primary using a CT will only work for DRSSTC, since the primary circuit has its own resonating frequency based on the L-C used. However, CT feedbacking from secondary on a DRSSTC or a SSTC will work, as long the driver circuit is correct in every way from the interrupter, logics, power supply, gdt driver, GDT, and half bridge. If you don't have primary capacitor, do not waste your time picking signal from the primary, try using the ct on the bottom of the secondary or try using an Antenna (with correct material, length and position).
The variac behavior indicates a wrong feedbacking application (i experienced it before) What I did is to re-check my design from the basics to the critical parts of the system, I ensure everything is in the correct assembly. you can check the logic circuit section when you put a GDT on its output and hears a rattling sounds base on your interrupter bps. Thanks,
Registered Member #1412
Joined: Thu Mar 27 2008, 04:07PM
Location: Taipei Taiwan
Posts: 278
I didn't use a resonant capacitor because I want to check if everything is correct before I install it.
Now seems that the resonant frequency of my secondary is too high for DRSSTC.So probably it can only work as a SSTC.I don't like big secondaries.Is it really impossible to build a DRSSTC using small secondary?
Registered Member #2919
Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
hsieh wrote ...
I didn't use a resonant capacitor because I want to check if everything is correct before I install it.
Now seems that the resonant frequency of my secondary is too high for DRSSTC.So probably it can only work as a SSTC.I don't like big secondaries.Is it really impossible to build a DRSSTC using small secondary?
oneTesla is 7x3" or so...you can go down to 6x2" with 40 AWG wire.
Registered Member #3964
Joined: Thu Jun 23 2011, 03:23AM
Location: Valenzuela City
Posts: 332
the resonating speed of a drsstc is only limited by the switches. that is the IGBT on the bridge,. you can research for EVR's microbrute =)... and DRSSTC 5 of S.wards. I think those coils are in 600 - 750Khz fres. The key is on its toroid.. topload =)
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DRSSTC circuit without resonant capacitor
