I tested 3 drivers for my flyback(555, single trans, zvs). Whats the diff between the 3 drivers. Just curious?



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Alex1M66 years ago
The single transistor driver will "lock" on to a frequency that changes depending on the length of the arc. This driver gets bring very quickly.

The 555 based driver allows you to choose the frequency and duty cycle you are driving the MOSFET with. Depending on what frequency you tune the 555 based driver it can produce some pretty decent arcs at even just 12v input;



The ZVS is a highly efficient zero volt switching based oscillator.

The voltage from the flyback can vary with this driver but it gives high current on the output meaning the arc can be stretched out. At 12v input you will get under 10kV at around 8mA. But with 36v input mine will start arcing at 1 inch and can be stretched out to 5 inches meaning there is lots of current flowing through the arc.
Alex1M6 Alex1M66 years ago
Boring*
One is made with a 555, one is made with a single transistor, and one uses zero volt switching ?

Give us a clue !

What do you mean by "what's the difference ?"

Steve
safetec (author)  steveastrouk6 years ago
okay maybe a stated my question wrong, I know what the difference between them are and I have tested it. The question rather should be: Why are ZVS driver arcs hotter and able to be extended much further? also the colour differs. I have noticed that the single transistor produces alot of ozone and a long spark which starts out from further away than the ZVS. The 555 is a bit better if you get the frequency right and again its thin blue arcs that make a cracking sound. The ZVS only makes a high pitched whine when the gap becomes close to point where it will not be stretched anymore, appart from that its relatively quite. So again, whats the difference between them that they cause such different arcs?
+1

Hint, afaik, Steve is suggesting that you provide us with schematics.
lemonie6 years ago

Didn't you notice any difference?
That would be the point in testing them wouldn't it?

L
safetec (author)  lemonie6 years ago
okay maybe a stated my question wrong, I know what the difference between them are and I have tested it. The question rather should be: Why are ZVS driver arcs hotter and able to be extended much further? also the colour differs. I have noticed that the single transistor produces alot of ozone and a long spark which starts out from further away than the ZVS. The 555 is a bit better if you get the frequency right and again its thin blue arcs that make a cracking sound. The ZVS only makes a high pitched whine when the gap becomes close to point where it will not be stretched anymore, appart from that its relatively quite. So again, whats the difference between them that they cause such different arcs?