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Registered Member #1356
Joined: Tue Feb 26 2008, 12:02AM
Location:
Posts: 6
Hey im new to HV i made my first flyback today and needless tosay i was pretty stoked. I made one of the simple dreded 3305 drivers with 5 turns and 3 turns on the transformer and two 9Vs in series. Now i want to go bigger though and i need some help on what i should do. I want to do something with simplicity but with a decent power. any help would be greatly apprecated on what type of transistors to use or a type of driver.
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
Before trying another driver, hook you current one up to a more powerful energy source. Try one of those portable emergency car battery jumpers; they put out 12V and nearly as many amps as you want. Just be sure to heatsink the 2N3055.
If you are still not satisfied, I highly recommend the Mazilli driver or "ZVS driver" as I know it. It delivers a ton of power if you can supply it, and with nearly no adjustments at all.
Also excellent is the 555 driver (good because you can audio-mod it later). This one is supposedly capable of the most power, but it must be manually tuned into resonance. This can be tricky without a scope, plus a slip of the dial and its dead.
JMartis came up with an improved single-transistor driver that's worth a try; it seemed to work very well.
They are all fairly easy builds, and all three will come up in a search of these archives and probably google too.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
the 555 driver with a juicy transistor,preferably irfp460,since it is so cheap and powerful and you can get high currents through some flybacks still at very high voltages.then when you have completed that move on to the zvs.the go to 555 halfbridge.then perhaps 555 fullbridge.zvs is most powerful i have seen a video of but i figure the half and fullbridge are the strongest.
Registered Member #1356
Joined: Tue Feb 26 2008, 12:02AM
Location:
Posts: 6
Hold on is shuan right i can use a car battery or on of the portable jumpers to do that? Cause i know theyre about 12V and they put out a ridiclious amount of amperage And lets say for now i want to have more of a hand held source of power what should i use?
Registered Member #1103
Joined: Mon Nov 05 2007, 06:02PM
Location: Houston
Posts: 80
Arcstarter, I agree with you. If you can get ahold of some beefy mosfets and drive them with the proper frequency along with a decent gate driver you can feed the flyback tons of power. Heck, you don't even need a gate driver if your FET has a low gate capacitance. I use gate drivers because they provide the needed amperage for quick turn-on times.
My flyback circuit uses a halfbridge of irfp460a's with two UCC gate drivers (inverting and noninverting). Currently I'm not using a gate driver transformer, but it might be easier to use a single gate driver and wind an approptiate GDT. This would isolate the UCC chips from the FET's and might prove to be safer in the long run.
Sometime or another I'll finally make a project thread for my driver.
Registered Member #580
Joined: Mon Mar 12 2007, 03:17PM
Location: Melbourne, Australia
Posts: 410
You can't force an amount of amps into something! current is the rate of flow, if you connect a low power device like a led, the flow will be low=low current, however if you connect a huge motor it will draw lots of current. The rating on the battery just tells you what is the maximum possible current it can deliver should you have a load that actually uses that much.
The advantage being it will hold at 12v under high load, unlike your 9v batteries which usually wont.
Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
avi is right but to use more amps you need to increase your input voltage so 24v will draw about 2x the amps that 12v would draw and 36v will draw 2x the amps that 24v will draw and so on.
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Flyback transformer help
