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Registered Member #3925
Joined: Fri Jun 03 2011, 10:50AM
Location:
Posts: 121
hey,
i have tried (twice) to remove the flyback transformer, from the coil in the zvs driver, and when powered up, one of the zeners immediately short circuits, thus allowing the full current from the battery to flow to the coil, this ruins all possibility of using it as an induction heater. why does this happen? :/
Registered Member #3888
Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
You could leave the core in, wind a few turns for the secondary, and run the output to your work coil. by adding more primary turns than secondary turns you could keep the circuit happy while having high output current.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Dr. Kilovolt wrote ...
Use a bigger coil with more turns, and a bigger resonant capacitor.
I would think a smaller resonant capacitor would be better. The higher the frequency, the higher the impedance per unit of L.
It is definitely doable, i have done it, though it worked better with an impedance matching transformer. But Vasil made a higher voltage ZVS driver used as a sstc, which (obviously) used an air cored primary. However, this was higher inductance, i think he used 5+5 turns but the diameter was much larger than any IH would use. Either try more turns, or use an impedance matching transformer with something like the 5+5 turns for the primary, and however many turns on the secondary needed to more or less match the impedance of the work coil. Try something like 2 turns and work up from there to get the best performance.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
The higher the frequency, the more trouble have the gate resistor to switch the gates fast enough. The basic zvs driver doesn't work well above ~100-150 kHz, so calculate your L and C from this.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
bwang: In theory, in this circuit the FETs should switch only the real power, the reactive power circulates between the primary and capacitor. So with no workpiece inserted, the FETs should switch only the current required to cover losses in the L and C.
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zvs driver fails when transformer core not inserted?
