Power supply for ZVS driver?

I just built a beefed up ZVS driver to handle a large continuous current, however, I now lack a power supply that will allow me to reach its full potential. The biggest thing aside from my variac that I have is two xbox power supplies in series (24V 29A). I would like something around 40-50V with at least 5A. I could rewire a mot which would take a very long time and weigh a lot so if anyone has any schematics or pointers on how to make one electronically it would be much appreciated! 

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-max-2 years ago

What you need is a nice huge thumpin' transformer, like this one, and then some big beefy rectifiers, and then a hugeass capacitor to top it all off!

These materials can be pulled out of old linear power supplies. I got these beauties out of a really old (and VERY *VERY* HEAVY) TDK-lambda linear power supply that was rated for 5V 9A. I bought it at an antigue mall for $16! The direct unregulated output of the transformer is 17V unloaded. I think it will drop to about 12V loaded with 9A although I do not have a big enough dummy load to do that with yet.

-max- -max-2 years ago

Here are some photo's I made when I updated my flyback driver instructable. I show a few common schematics for full wave bridge rectification.

common wiring diagrams for unregulated transformer brute power supplies.pngunsuitable power supplies for SSTC.png
Jimmy Proton (author)  -max-2 years ago

Thanks for your comments! I tried using a few different printer power supplies and they shut down every time. the xbox power supplies however seem to do the job well. currently making an instructable on a bench top power supply with them

Yup, foldback current limiting can be a real bit*ch when it comes to the electronics experimentation. I also use a XBOX power supply! But I have had the same problem with the red light coming on and shutting off the output when connected to loads which draw either too much current or large inrush current. My solution was to hack it, shorting out the shunt resistor (so that the thing cannot measure the voltage drop across it to determine current) which helped, but it still was not enough, so I shorted one of the optocouplers which enables the high voltage side of the power supply to oscillate to +5V through a resistor so that the safety chip is completly bypassed! Now even when I short the power supply the output will never shut off! (I just hope the thing does not explode into a fireball if left shorted for too long :O )

-max-2 years ago

Getting 50V >300VA might be a challenge. Maybe you could use a large variac or 2:1 transformer (normally designed to convert 110V to 220V), or welding transformer. Wiring switch mode power supplies in series or parallel is often a bad idea because it will make the feedback loop unstable in both supplies, causing to fall "out of ballence."

Ok, you made a ZVS, but for what?

For my induction heating stuff I use an old stick welder and a rectifier as the power source...