Agentgates´s TPU setup with strange wavehill hump

[agentgates]

@Lindsay

Something i not right there. The IGBTs shouldn't be vital.

This is my configuration with the 80mm mailing tube for ONE primary coil:

10 degrees gap between each primary. 0.19mm thin wire. (I tried it up to 0.38mm, worked)
9 turns of the secondary. (0.74mm)

Drive it with low freq. This configuration will give you the nice high current exponential spikes I mentioned. Please DO use current limiter resistor. My latest coil has 0.19mm for primary and a single 15 ohms current limiter for the source.

If you want to light a bulb with ONE primary you will need to go higher with the output voltage, otherwise you will need the minimum 3 primary. My first design was running on 500V spikes, smoothed a bit with LC and went in the next TPU. The next stage went to 800V spikes, smoothing again with LC and the bulb. (this is bad, and the current design will run with one TPU without LC)

The PRESENT design:

0.19mm primary coils. Altogether 3 primary wound on the acrylic tube in the same manner. 45 degrees angle to the centreline and 10 degrees between the same primary coil. Each primary coil has 3.33 degrees offset to the previous one.

Some photos of the present design:

http://www.samsonium.org/sites/default/files/P1100273.JPG
http://www.samsonium.org/sites/default/files/P1070270.JPG

Incoming signal on 2 channels with overlapping, but if you use 4017 the next things still should work. (please ignore the falling edge that is corrected by 3x 1Mohm pulldown, just focus on the delay between the channels and the duty cycle 50%)
http://www.samsonium.org/sites/default/files/P1080272.JPG

http://www.samsonium.org/sites/default/files/P1100276.JPG
http://www.samsonium.org/sites/default/files/P1100277.JPG

Lock the scope trigger on the output, slowly increase the input and watch the scope signal on the output with the growing hump:
http://www.samsonium.org/sites/default/files/P1100278.JPG
http://www.samsonium.org/sites/default/files/P1100279.JPG

My zero line is the red marker on the left.

This is RAPIDLY happenning as you are slowly increasing the input:
http://www.samsonium.org/sites/default/files/P1100280.JPG
http://www.samsonium.org/sites/default/files/P1100281.JPG

The 2 more humps will appear to the left and right. This the correct signal. The current should rapidly fall back on the input side as they jump out.

BUT, If you receive something like this:
http://www.samsonium.org/sites/default/files/P1060254.JPG

then your winding is incorrect.

Please see the winding on the current coil. One coil:
http://www.samsonium.org/sites/default/files/P1070265.JPG

2 coils:
http://www.samsonium.org/sites/default/files/P1070267.JPG


and 3 coils ready:
http://www.samsonium.org/sites/default/files/P1070270.JPG

@ketone

Your coil is very nice! Please make sure you will set the resistance with a current limiter resistor to 20ohm in series. Probably a 18ohms 5W resistor or 22ohms. You will see it.

Thanks for the advices to everyone on youtube-hell-format. I will look into it as I screwd up a half day with coding yesterday.

UPDATE1

Ignore the 3 huge IGBTs as it is voltage driven now. Later I will use darlingtons or a single darlington array.

UPDATE2

I have forgotten the most important. There is a single secondary on it right now. Presently waiting for Stefan's reply on the 2x200V

http://www.samsonium.org/sites/default/files/P1100282.JPG

[teslaalset]

@ Tony,

A quick question:
What type of powerFET drivers are you using?
(I use MC 34151 for the moment)

B.t.w. you called it Current design, which is kind of confusing.
You probably ment Present
Apart from that this design is voltage driven i.s.o. current driven.

Thanks for the new details!

[agentgates]

@ Tony,

A quick question:
What type of powerFET drivers are you using.
(I currently use MC 34151)

B.t.w. you called it Current design, which is kind of confusing.
You probably ment present in such that this design is voltage driven i.s.o. current driven.

TC426CPA unfortunatelly inverting but don't let it to confuse you, just use a normal non-inverting one. BTW they are rubbish, very sensitive for ESD. I found them in the drawer. My favourite FET drivers are coming on the next week (hopefully) as we have heavy snowing and other problems right now.

lol @ current/present. yes you are right, I fix it.

[agentgates]

@Stefan

Do you want an inverter on it? As if you do please let me know it now and I'll wind the secondary for 2x200V on your coil.

[Mannix]

Thanks tony!

You have made it clear,  nice coil  beautifil in fact.. hope you dont melt it!

I wonder if being in the southern hemisphere I may  need to wind the primary in reverse direction, just something that Steven said once.

just let me know if they work both ways for you and ill leave that out of the equasion

I will wind another on a bigger spool like you have done to make things easier to handle, fine wire .

Currenty using .25mm on the 80mm spool the out put 5 turns 1mm wire taped down resonably firm 10mm gap between secondary 9mm between primary.. relying on the wire coating for seperation between primary and secondary





I will perservere using your guidance.. we have almost the exact same lvdc power supplies
thank you for the concise descriptions.

lindsay