You must log in or sign up to reply here. I’ve been experimenting with the common two-transistor driver design with great sucess , but 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. N secondary voltage at the primary winding during Tdischarge, as per Fig3. This was before I knew anything about electricity, so 5V was all I considered safe for the driver. Simply take the HV lead and bring it near the pins on the bottom. A magnet plasma vortex can be made with the round ferrite magnets found in microwave ovens.

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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. Jul 2, 6.

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. After some time the timer will turn off the mosfet again and the current will be forced to stop. It is your own life, so proceed at your own risk!

Therefore, the operating principle of both converters is powfred similar:.

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Basically just check that everything is wired correctly, if it is, check that all the parts are functioning. Make sure you use a mosfet and not a bipolar junction transistor, the symbol in the datasheet should resemble the one in the schematic. The flyback converter is an isolated power converter. Also there is a need for a controlling rail which has to be loaded before load poweree applied to the uncontrolled rails, this is to allow the PWM to open up and supply enough energy to the transformer.


The internal primary can be maine by measuring resistance.

Flyback converter

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. This is caused by a false primary or wrong phasing. If you get a high pitched whine it’s alive. This topology is now replacing ringing choke converters RCCs in applications such as mobile phone chargers.

However, this is not possible since the primary has significant inductance. Jun 24, 3. The schematic of a flyback converter can be seen in Fig. Some flybacks may have several winding mainss will appear to be primaries, in this case the real one can only be found by measuring inductance. Since some energy is poweref in the mosfet, adequate heatsinking of the IRFP is required.

Also you don’t need to worry about destroying the internal primary during the experimentation phase. Wind your own if you fail to find the internal primary.

The number of turns varies, and is determined by operating voltage, on-time and core cross-sectional area. Both require a signal related to the output voltage. This was before I knew anything about electricity, so 5V was all I considered safe for the driver. Articles lacking in-text citations from October All articles lacking in-text citations All articles with unsourced statements Articles with unsourced statements from October Commons category link is on Wikidata.



Mains powered flyback driver for HV source? | Electronics Forums

The ground pin can be found by finding the pin the HV arcs to the most. Wikimedia Commons has media related to Flyback converters.

Can anyone comment on these? To obtain a high frequency variable duty cycle drive signal we can use the timer. The first is to use an optocoupler on the secondary circuitry to send a signal to the controller.

This was before it was upgraded into the Multipurpose Inverter. I can’t measure it, of course, but it’s clearly making shorter arcs.

The first two drivers on this page drive the flyback in flyback mode, while the last two use push-pull topologies. This article includes a list of referencesbut its sources remain unclear because it has insufficient inline citations. The third technique, primary-side sensing, can be as accurate as the first and more economical than the second, yet requires a minimum load so that the discharge-event keeps occurring, providing the opportunities to sample the 1: