Author Topic: Working Principle Of Neon Transformer Circuit  (Read 104 times)

Offline iraquois

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Working Principle Of Neon Transformer Circuit
« on: May 23, 2020, 02:09:26 PM »
Hi. I am new to this forum and I couldn't find where to post this message. Sorry if it is in the wrong place. My intention is to make and understand the working of a 4kV 10mA 40W neon transformer circuit. I know it can be done with a flyback transformer and some pwm modules like tl494 sg3525 uc3845 NE555 etc... But Does anyone know what is inside a modern neon transformer. Actually my buildings are always produce 4kV from a power supply which has 12-24V and 2-3 amps. But as you know neon sign transformers are powered from directly 220V AC mains. Are they buck 220V to lower levels and then boost again or are they directly boost it to 4-10kv. I will be appreciated for any idea to show me the way I should start with. Thank you for reading.

Offline Mads Barnkob

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Re: Working Principle Of Neon Transformer Circuit
« Reply #1 on: May 23, 2020, 08:22:59 PM »
Hi and welcome to HVF

A quick google search for "neon electronic transformer" tells me that there properly is two types. The dirt cheap and the actually safe properly engineered.

There seems to be a lot of copies of this design floating around, which means that some companies have likely copied that into a product.


Here is one that actually seems to be a http://www.evertron.net/ manufactured unit where the schematic is available at repairfaq
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline davekni

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Re: Working Principle Of Neon Transformer Circuit
« Reply #2 on: May 23, 2020, 10:24:55 PM »
Mads,

That upper simple circuit is almost exactly what I've built in low-voltage versions (12-48V) for misc. projects such as a tiny eddy-current levitation demonstration and small induction heater.  I don't have the base resistors (which must be milliohms), and usually add reverse CE diodes.  It's a nice simple ZCS oscillator for series-resonant loads.
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Online ritaismyconscience

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Re: Working Principle Of Neon Transformer Circuit
« Reply #3 on: May 24, 2020, 07:56:21 AM »
I think the 1st circuit is used in most fluorescent lamps. Is there anything wrong with it (other than no fuse)?

Offline iraquois

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Re: Working Principle Of Neon Transformer Circuit
« Reply #4 on: May 24, 2020, 02:08:53 PM »
Thanks a lot for your answers. Second circuit is a little bit odd to me. Will it boost 120 VAC (170VDC) to 4KV with a turn rate of 56/75 ?

Offline davekni

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Re: Working Principle Of Neon Transformer Circuit
« Reply #5 on: May 24, 2020, 09:55:48 PM »
Most of the complexity of the second circuit is ground-fault protection for the HV output.  Looks like it shuts down if either end of the output arcs to ground (ie. through a person) or to the transformer case.

The 56-64 turns comment appears to be a range of values for the primary winding, perhaps for different models.  The turns ratio secondary/primary will be much higher.
David Knierim

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Re: Working Principle Of Neon Transformer Circuit
« Reply #5 on: May 24, 2020, 09:55:48 PM »

 


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