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Registered Member #513
Joined: Sat Feb 10 2007, 07:30PM
Location: Pointe-Claire, Quebec, Canada
Posts: 19
Hey All,
I have a few questions about a flyback driver that I want to build. I would like to know if I could operate it without the transformer that steps down 220 to 110 V (operate it directly from the 110 V of mains.) Also, Is the isolation transformer that the signal generator is driving the transistor through necessary? (It has a 3 to 2 ratio). If so, could I wind it myself? What kind of core could I use? More info about this circuit from original location : (4th page I believe)
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
Hello, First, both your drawing and the original drawing are wrong, the diode across the high voltage supply is the wrong way around the instant you switch on there will be smoke. The diode should be reversed - then it will do no harm it does no good either so just remove that diode.
There is no component to 'catch' any large flyback spikes - consider a TVS or R-C snubber, or D-C-R snubber.
The transformer's main function is to electrically isolate the signal generator from the live ac mains. IT is VERY important for safety and should be made with care - your life may depend upon it! The transformer ratio has nothing to do with the supply voltage it's ratio is chosen to match signal generator output impedance to transistor input impedance. Without knowing the generator output impedance the correct Pri-Sec turns ratio cannot be determined.
The circuit diagram that you have there is very poor - too many errors to be a 'reference' design.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi Matthew
The described circuit will not work the way it's drawn. That diode parallel with filter capacitor creates a direct short over power supply. I don't think the signal generator will provide closely enough power to properly drive that transistor. You would need to build some kind of base driver, desirably current-proportional drive wich I wouldn't recommend if you are begginer.
Stick to this circuit.
Search the forum and archives, there are tons of information around.. and just ask if you need any additional help.
Registered Member #513
Joined: Sat Feb 10 2007, 07:30PM
Location: Pointe-Claire, Quebec, Canada
Posts: 19
Thanks Firkragg,
With the Mazzilli driver, how do I go about putting the primaries in parallel. Is a simple matter of winding the 5 + 5 turns on both cores and connecting the windings to their respective points? I am attempting to put several flyback secondaries in series to obtain a higher voltage. Such technique is described in the old forum :
Also, what is the difference between powering each flyback with an individual driver with the secondaries in series and putting all primaries in parallel and driving with one ZVS driver?
I have tried quite a few things in respect to putting the secondaries of modern split diode flyback in series with little success and need some advice.
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Flyback Driver
