I built this driver using an MJE and a 0. The next flyback driver is By far the most powerful and efficient. Perhaps some added capacitance on the output of the power supply could even the spikes out. I cut off the problematic pin and put a blob of hot-melt glue on it, but it still arcs. However the PSU turns off as soon as I attach the flyback driver. October 10, at Keep in mind that the transistor is failing not when I disconnect power but when I increase it above 3 A or so.

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Is there anything I could tune in this circuit or should I instead just go ahead to the next level and build a Mazzilli driver?

I finally bothered to set up a couple of server power supplies in series to try this circuit at 24V. I cut off the problematic pin and put a blob of hot-melt glue on it, but it still arcs. October 12, at I think you should put a heatsink.

You could also varnish it or if possible, mold it all shut in epoxy. Hi William What kind of transformer are you trying to drive?

November 22, at Sign up or log in Sign up using Google. I wonder what material would be more suitable for isolation?

Transistor SOA is well under the limits TonyStewart ; what could be the other reasons except for that? To actually use it, you need to be below that temperature by a large margin. You may get shown videos of 2ns TIP35Cs working in this configuration, but if their transformer is a bit soggier, or their transistor is a bit more robust, theirs could work OK, and yours fail. 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 cycles, and the second is that there is a quasi resonant capacitor across the primary.


2n flyback driver | Kaizer Power Electronics

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, 23n055 for example if you ran it of 12volts the mosfets would only produce minimal heat. Working with electricity is dangerous, all information found on my site is for educational purpose and I accept no responsibility for others actions using the information found on this site. June 6, at November 21, at The driver is built on a piece of vero board with multiply resistors to obtain the needed wattage rating, this is far from optimal as the load sharing between them is horrible, to ensure better sharing.

I found this might be helpful on other’s experience blowing transistors on 2nn3055. There are three types of flybacks: Unfortunately it turns out that some sort of protection in the power supplies is kicking in as they occasionally shut down, typically when the arc breaks.

2N Flyback Transformer Driver

Now for the capacitor, the 0. If the transistor is google for much higher currents than the OP’s conditions. I highly reccomend building this driver first, to familiarise your self with the suprises of HV. IMO The Mazelli drivers that occasionally fail are generally due to people not using heat sinks or poorly made one as well.


At 4 V, the system draws about 2 A and I get several thousand volts out of the flyback, as expected. My question is, what would cause the transistor to die at so much less than its rated specifications?

2n3055 flyback driver

The transistor heats up to scorching temperatures within minutes despite goofle fan. Have you read the other comments on this page, others have also tried their luck with similar transistors.

Hi Alex The diode and capacitors protects the transistor from high voltage transients that will eventually kill your transistor. I’ve been thinking of buying an oscilloscope Sign up using Facebook. There are several things you can do to avoid failure due to high collector voltage Well, technically yes, but the rating at that temperature is zero dissipation. The TIP35C mentioned in the video is V rating, but even that is rather low for the suggested configuration.

It sounds like your PSU is shutting down due to overcurrent.