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Registered Member #528
Joined: Fri Feb 16 2007, 10:32PM
Location: Warsaw, Poland
Posts: 166
How can I combine everything? I'm trying to construct a self-tuning SSTC and at first time I tried to use scheme with antena, where, in place of antena, I put a output of 74HC14E, but it gave only a messed signal.
The current transformer is wounded by mysfelf - Ferroxcube TN20/10/7, 3E25 material, AL=5340 nH, about 100 turns of enameled wires. The whole current feedback circuit is copied from Steve Ward's scheme (with the one difference, instead of second 1N4148 pair, I've used 1N5819's).
For testing, I've connected interrupter output to drivers, so half-bridge would switch.
Waveforms - square wave is representing a 74HC14E's output (which isn't connected to anything because I don't know where) and sine wave is a primary current. I guess it's not in phase - heck, it looks like 90* phase shift.
Overall setup (enlarging possible):
Current transformer. The black one below is another current transformer I use for scoping primary current:
Any ideas how to solve phase shift problem and combining everything to get a working SSTC inverter?
Registered Member #528
Joined: Fri Feb 16 2007, 10:32PM
Location: Warsaw, Poland
Posts: 166
Marko wrote ...
The phase shift is OK, it is caused by leakage inductance in your system (in which, as far as I see, almost no real power is consumed?).
Does it mean if I add a load, the waveforms will shift and they will be in phase? Yes, no power is consumed, as I haven't done a driver and I'm afraid to put secondary coil - I would like to get driver and half-bridge working first.
wrote ...
You should really use a TC secondary for proper testing, or use proper coupling and resisitve load that imitates streamer load (Q of 10 or so.)
Could you tell more? How to estimate streamer load, etc.? Are light bulbs a suitable for dummy load? It sounds safer than secondary coil, so I'm asking :)
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Combining primary current feedback+TC4422+TC421+NE555 and phase shift problem
