Author Topic: Transformer Driver  (Read 3207 times)

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hydro

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Transformer Driver
« on: May 09, 2008, 13:23:35 pm »
Most of all the circuits people use on the net for driving transformers just suck badly. there's a terrible loss when pulsing a transformer on just one side by using something like a 555 timer.

I would like to one day make a circuit to pulse both sides of the transformer at different times, unlike the half phase pulses we have been using, i feel it would help everyone out alot when dealing with transformers. what we have is a bit cheesy, thats just an ideal i've had for a while now. i know the circuits probably out there i just haven't found it yet.

ChewieChub

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Re: Transformer Driver
« Reply #1 on: May 09, 2008, 23:05:51 pm »
Alternate driver circuit idea.

Some solid state Neon light power supplies use rectified 120VAC to get 200vdc which can directly drive a 600VDC 555 equivalent chip: IR2153-S.   This chip has dual outputs that are designed to drive dual IRF640 FETs in a push-pull configuration to minimize the rise and fall times and generate the sharpest possible transformer primary voltage swings.   The more intense the primary swing is, the higher the secondary voltage will be.   This results in consistent high frequency / high K-voltages.

I almost finished the schematic of an Allanson Neon Supply SS935ICH (attached).  This was a potted device (circuit board was encased in epoxy resin).  They are about 40-50 bucks and run at about 22kz.  They contains a dual shutdown safety circuit,  they will shut down if the load is too high, or if the load is too low.  So it made it frustrating to test on a Cell.

I figured if I could double the frequency, remove the safety and run it at 1/10th of its power level I could see how it behaved with a Cell.   Never got around to it tho..

Chewie.


ChewieChub

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Re: Transformer Driver
« Reply #2 on: May 09, 2008, 23:11:51 pm »
Second Attachment:   IR2153D.jpg   first page of International Rectifier PDF.

C.

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Re: Transformer Driver
« Reply #3 on: May 15, 2008, 20:40:48 pm »
I have been using National Instruments Labview to drive the FET.  I soldered up an array of four FET's to distribute the power and reduce the amps thru each one.  They seem to run rather cool at full power.  The nice thing about Labview, is that it is very universal and you can set and hold the exact frequency(s) that you desire.  I plan to use the alternator system with a feedback loop to monitor and control the speed of the alternator, while letting the system adjust the voltage to the rotor.  Using a 1 hp 2500RPM permanent magnet 90V DC motor with speed controller(110v AC in, 90V out to motor) to drive the alternator.  I can post a picture if requested.

Hope this helps,
Wireguy


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Re: Transformer Driver
« Reply #4 on: April 14, 2013, 20:47:17 pm »
so this is my problem as well... finally got a waveform that may work for testing but even after pushing it thru a transformer it still looks like it does out of the signal generator..  no up side down reflection :/