Has anyone tried a mains-powered driver circuit for a flyback with a hand-wounded secondary to be used as a HV source? If the output is weak, the primary polarity may need reversing. Wind your own if you fail to find the internal primary. Simply take the HV lead and bring it near the pins on the bottom. The optimal operating frequency can have many harmonics, which will work as well as the actual optimal frequency to some extent. Can anyone comment on these? By using this site, you agree to the Terms of Use and Privacy Policy.

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Flyback Transformer Drivers

If you’re over 40 you will need to confirm powere with your kids. It is currently set to run between kHz, which should be a large enough range to sweep through any harmonics a flyback may have. Troubleshooting Of course something can go wrong, so if you’re unlucky check these points.

Evidently flybacks don’t like 60hz The operation of storing energy in the transformer before transferring to the output of the converter allows the topology to easily generate multiple outputs with little additional circuitry, although the output voltages have to be able to match each other through the turns ratio.

You can check for a frequency by replacing the flyback with a speaker.

Flyback converter – Wikipedia

Just did It works perfectly fine, through performance is not the same as a proper high frequency driver – i get lower voltage out of the system. This is a pretty standard astable design. This is caused by a false primary or wrong phasing. Flybacks are designed to work best anywhere between 15 to kHz, powerex some experimentation is required to find the intended operating frequency.

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Mains powered flyback driver for HV source? | Electronics Forums

For general use, 3 to 10 turns should be right for this driver. Since flyback transformers use a ferrite core they need vastly different operating conditions than an iron cored mains transformer. Jul 2, 6.

All projects are for noncommercial use only. The number of turns varies, and is determined by operating voltage, on-time and core cross-sectional area.

Also there is a need for a controlling rail which has to be loaded before load is applied to the uncontrolled rails, this is to allow the PWM to open up and supply enough energy to the transformer. The ground pin can be found by finding the pin the HV arcs to the most. Can anyone comment on these? Jun 24, 3. 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.

There are three common ways to generate this voltage. So, spring the ten or fifteen bucks for parts, slap one together, don’t kill yourself, and report back with your results.

After some time the timer will turn off the mosfet again and the current will be forced to stop.

The internal primary can be found by measuring resistance. The flyback converter is a buck-boost converter with the inductor split to form a transformer, so that the voltage ratios are multiplied with an additional advantage of isolation.

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Flyback converter

It is your own life, so proceed at your own risk! However, this is not possible since the primary has significant inductance.

If you’re getting a drive signal out of the circuit, you are probably not connected to the correct primary. If the output is weak, the primary polarity may need reversing. In other projects Wikimedia Commons. Please help to improve this article by introducing more precise citations. Also you don’t need to worry about destroying the internal primary during the experimentation phase.

This topology is now replacing ringing choke converters RCCs in applications such as mobile phone chargers. Some flybacks may have several winding which will appear to be primaries, in this case the real one can only be found by measuring inductance. The current then causes the voltage at the mosfet drain to increase in an attempt at allowing current to flow.

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.