So, i came along this site http: This is caused by a false primary or wrong phasing. Previously, a measurement was taken across the whole of the flyback waveform which led to error, but it was realized that measurements at the so-called knee point when the secondary current is zero, see Fig. Use a timer tester circuit. This is what I hate the most. Standard Monitor Flyback Transformer with new primary.

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Always check that the is still functioning. Similar Threads Mains powered buck driver. If you’re getting a drive signal out of the circuit, you are probably not connected to the correct primary. N secondary voltage at the primary winding during Tdischarge, as per Fig3. What that means is that the mosfet is turned on by the timer, and current starts to flow through the primary winding. In fact flyback transformers aren’t really conventional transformers at all, but coupled inductors which means they should be driven differently.

The third consists of sampling the voltage amplitude on the primary side, during the discharge, referenced to the standing primary DC voltage.

Mains powered flyback driver for HV source? | Electronics Forums

The first two drivers on this page drive the flyback in flyback mode, while the last two poweged push-pull topologies.

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My main concern is performance. I’ve been experimenting with the common two-transistor driver design with great sucessbut it needs VDC, and i want to keep the design as simple as possible as i want to build two small standalone HV displays a Jacob Ladder and a Plasma Globe, both working fine already.


The ground pin can be found by finding the pin the HV arcs to the most. The first technique involving an optocoupler has been used to obtain tight voltage and current regulation, whereas the second approach has been developed for cost-sensitive applications where the output does not need to be as tightly controlled, but up to 11 components including the optocoupler could be eliminated from the overall design.

Check to see if you have found the correct ground pin. A magnet plasma vortex can be made with the round ferrite magnets found in microwave ovens.

This was before I knew anything about electricity, so 5V was all I considered safe for the driver.

Flyback converter

Projects are merely presented as a source of inspiration, and should only be conducted by responsible individuals, or under the supervision of responsible individuals. The voltage at the mosfet drain will potentially be equal to the breakdown voltage of the mosfet, meaning the primary voltage will be hundred of volts now.

If you’re over 40 you will need to confirm this with your kids. The number of turns varies, and is determined by operating voltage, on-time and core cross-sectional area. All projects are for noncommercial use only. Fyback transformers are generally either driven in “flyback mode”, or some push-pull topology. Due to the large turns ratio of the flyback the few hundred volts at the primary become several thousand volts on the secondary.


It should be around 1 ohm. Troubleshooting Of course something can go wrong, so if you’re unlucky check these points.

The primary must powred wound directly onto the exposed ferrite core. Since some energy is avalanched in the mosfet, adequate heatsinking of the IRFP is required. Jun 24, 4. You can check for a frequency by replacing the flyback with a speaker. They are used for generating high voltage for the CRT, which is needed to powerd an electric field, which in turn accelerates electrons towards the screen, which finally excite phosphors and create the image you see.

Retrieved from ” https: As mentioned above this driver drives the flyback in flyback mode. Oh, i know they’re not nearly as safe as the DC driven ones – i can deal with that. This is what I hate the most.

For a different frequency range you can use a timer calculator or just experiment to find new capacitor and resistor values. This blurry picture is all I have to suggests that the arcs are green.

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