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Registered Member #1751
Joined: Fri Oct 10 2008, 03:16PM
Location: India
Posts: 16
Hello there. First of all i am a newbie (wrt u ppl !) so plz dont insult me if i am wrong. I need a driver that could output the highest voltage keeping the current to the MINIMUM as i dont want to fry my flyback. I think the o/p voltage is a function of the input voltage and the frequency of the ckt. Using a higher input voltage (v>30) will raise the output but i got my LOPT fried several times. With an overpowered 555 or zvs the flyback goes really hot but its the o/p current that gets tremendous and i dont want that. I dont need heavy arcs, just the streamers would do. And i need really long arcs really large voltage... Can anybody suggest any modification for ANY driver to suit my need? THANKS IN ADVANCE
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Running a ZVS at 5V I was getting some 60mm very thin sparks, but it would also flash over between all the legs on the bottom of the flyback transformer.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
Adding a transistor and two resistors (Q1, R5, R6) allows safe limitation of the maximum current. If Q1 is put into conduction, the duty cycle of the 555 is reduced, and the maximum current is limited. With 0.2 Ohm, the limit is at about 5 A. I tested this with the normal input winding of the flyback, but this requires a high-voltage driver transistor (1500 V). With an external winding, less voltage is required, but the current increases. The drawing is a schematic for simulation with Ltspice.
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Flyback Driver Modification
