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How does a ZVS flyback transformer work?
This induces a current into the thousands of windings in the secondary coil of the transformer. Because there is a high ratio of secondary windings to primary windings, the voltage on the output of the flyback transformer is extremely high. The ZVS oscillator is the most complex part of this circuit, so I am going to explain how it works.
What is the duty cycle of a flyback transformers?
The flyback controller opens and closes the switch with the appropriate duty cycle to achieve the required output voltage. The duty cycle of flyback transformers typically does not exceed 0.5. Various combinations of turns ratios and duty cycles can be used to achieve the required output voltage according to this equation:
How does the ZVS oscillator work on a TV?
The ZVS oscillator pushes and pulls current though a center-tapped coil around the ferrite core of a TV’s flyback transformer. This constant changing of the current’s direction creates a fluctuating magnetic field in the ferrite. This induces a current into the thousands of windings in the secondary coil of the transformer.
How does the ZVS high voltage power supply work?
It first uses a streetlight transformer to step down the 110 volt mains current to 40 volts. This is then rectified and filtered to achieve a clean DC voltage that is fed to the ZVS oscillator board.
How much voltage does the ZVS oscillator need?
This whole capacitor was added in parallel to the primary coil of the flyback transformer. The ZVS oscillator needs a low voltage power supply to power it. It needs about 40 volts at 10 amps to work at full capacity.
What kind of MOSFET do I need for ZVS?
A good rule of thumb is to use mosfets that are rated at 4x the voltage you plan on feeding the oscillator and the IRFP250 or the better IRFP260 is a good mosfet for the task. You’ll need some heatsinks for the mosfets, but they do not need to be large.
What do you need for a ZVS power supply?
To build this power supply, you will need a few parts, luckily, most can be salvaged for free. If you have ever seen an old CRT TV laying on the side of the road, pick it up, because it has most of the parts needed for this project in it. Ok, so you will need: Flyback transformer (Old TV) 2x 470ohm resistors (Old TV)
What kind of MOSFET for ZVS flyback driver?
I built a ZVS flyback driver a couple months ago, and it worked great and amazed people with the arcs it managed to create. I used 2 IRFP250 MOSFETs and the results were great. One day I was wanting even bigger arcs, and I combined two 12 volt batteries and a 12 volt car jump starter, for 36 volts and the arcs were giant.
Is it safe to use a ZVS driver?
And finally, you are solely responsible for any harm to others or damage or any other problems that a ZVS driver may cause. The ZVS driver should be used for educational and research purpose only. That is the end of my health and safety rant. 🙂 ZVS drivers are fairly cheap to build, the only pricey part may be the MOSFET’s.