ZVS stands for ‘Zero voltage switching’, which bascicly means that when there is zero volts across the mosfet it turns on and then lets current trough,this inturn causes very little heating, so for example if you ran it of 12volts the mosfets would only produce minimal heat. I think that my 2n may be dead. Learn how your comment data is processed. Proudly powered by WordPress. Due to lack of details on your primary windings added, power supply and transformer, I can only guess why it failed.

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The transistor heats up to scorching temperatures within minutes despite the fan. This site uses Akismet to reduce spam.

You could try to add a few more feedback windings and not have more than 8 primary windings to get a higher current running in the primary to get a bigger output.

flyback drivers – boydlabs

I think that my flybzck may be dead. Like I said, I’m fairly new to electronics, so I’m having a little trouble understanding parts of your answer! I cut off the problematic pin and put a blob of hot-melt glue on it, but it still arcs. Then it is without a doubt burned, double check that your circuit is correctly made and try with a new transistor and start with lower voltages.


2n3055 flyback driver

Post as a guest Name. October 10, at Now for the capacitor, the 0. At voltages higher than 12 VDC input, the components will dissipate a lot of heat and the 2n transistor is most likely to burn as it is not rated for more than 15 A and flybadk has to be derated even further for case temperatures above 25 o C.

As you can see there are some diferences in my design compared to the normal astable, the first thing you notice is that there is a wierd gate waveform shaper, all this does is ensure a slow turn on and a very fast turn off, inturn preventing the mosfet blowing at high duty fpyback, and gopgle second is that there is a quasi resonant capacitor across the primary.

June 20, at To find out more, including how to control cookies, see here: Different capacitors were tried, ranging from 10 nF to nF, nF was found to work the best for my flyback transformer. This site uses cookies. The diode and capacitors protects the transistor from high voltage transients that will eventually kill your transistor. Thanks Mads, That is very true about Facebook, and I Well, technically yes, but the rating at that temperature is zero dissipation.

What you can do is provide some isolation between the pins with pieces of plastic and super glue.


2N Flyback Transformer Driver

The circuit now pulls around 3A at 12V. Email Required, tlyback never shown. Proudly powered by WordPress. Sign up or log in Sign up using Google.

Hi, I have some issues with this circuit or any other circuit not working with my transformer. It was a fairly small one, though I only used a jumper to turn it on in the ATX plug.

When I do a diode check every possible way I get 0V except for neg to collector and pos to base I get. All of which i test out on gpogle circuit variation. As strange as it sounds this design is more flexible that it appears superficially.

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When I examine the transistor, it shows only a few ohms of resistance between any pair of pins, which I assume means I killed it. I’ve been thinking of buying an oscilloscope Hi William What kind of transformer are you trying to drive?

Would that be resolved by adding those diodes?

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