http://www.bakatronics.com/images/MX028s.jpg

Can someone tell me what kind of transformer this is? The windings are seperated into multiple sections to create a capacitance that multiplies within each section to create a high voltage.

What is this type of transformer called?
Where can I find more info on this type of transformer?
Are there any books on this type of transformer?

 

Hello,

It looks like an ferrit core high frequency transformer.
Here is a link to all kinds of transformertypes in the EDUCYPEDIA.
http://www.educypedia.be/electronics/transformertypes.htm
Take a look at the section : Miscellaneous types of transformers

There is anoyher page like that over there :
http://www.educypedia.be/electronics/electricitytransformers.htm

Greetings,
Bertus

 

Hello,

It looks like an ferrit core high frequency transformer.
Here is a link to all kinds of transformertypes in the EDUCYPEDIA.
http://www.educypedia.be/electronics/transformertypes.htm
Take a look at the section : Miscellaneous types of transformers

There is anoyher page like that over there :
http://www.educypedia.be/electronics/electricitytransformers.htm

Greetings,
Bertus

Wow, what a content rich site that seems to be, thanks, anymore like that?

http://www.educypedia.be/electronics/electronicaopening.htm

Lefty

 

Hello Lefty,

I have already put some of my links in the Useful websites thread.
http://forum.allaboutcircuits.com/showthread.php?t=9538

Greetings,
Bertus

 

That is an E core ferrite form, but is there more than one winding? How many wires run to the coils?

 

I am not sure.

I have seen this type of transformer before, but I can never seem to find out what it's actutally called. With this type of transformer it's not the turns ratio that gives the high voltages, it's the capacitance within each bobbin cavity multiplying with the adjacent cavity.

Very strange indeed, and capable of very high voltages!

I've heard it called a capacitance load driver transformer, But I don't think that's the official name for it, as whenever I try to look it up I never find it.

 

Those 6 capacitors and three diodes to the right of the coil/transformer look like a voltage multiplier.

Look at the other side of the PCB and see how many pads associate with the device in question. Two pads and it's a coil. Four or five, and it's a transformer.

Better yet, draw out the circuit and post it up.

 

On my monitor, the wire in the bottom coil is a darker orange and appears to be heavier gage. So, it appears at least two coils. That type of segmented winding for the secondary is common in HV transformers.

 

It is probably a flyback transformer. There is massive insulation on the coils to prevent breakdown. As you stated a flyback transformer doesn't get it's voltage SOLELY from turns ratio. It also produces high voltages by having a large dI/dt. As we all know,

V = L * dI/dt

so, if dI/dt is large, a huge voltage is produced that is proportional to the inductance. It appears that the inductance is set to remain linear by gapping the center tap.

This seem to make sense? This is just guess work on my part...

Oh yeah,

Another indicator that it is probably a flyback is the output diode to rectify the secondary. The normal mode of operation of a flyback is that you charge the inductance of the primary (because the diodes block the secondary from producing forward current), and when the primary is opened, the flyback energy is transfered to the secondary and conducted through the output diodes.

 

i always thought the sectioned bobbin in these hv transformers was to stop the windings flashing over because of the high potential differences...

 

Hello,

As beenthere has seen the caps and diodes make a voltage multiplier.
See this page of the EDUCYPEDIA (on the bottom there is a section voltage multipliers).
http://www.educypedia.be/electronics/powerelectronicssupplytopics.htm

Greetings,
Bertus

 

S lannan, the core is sectioned to facilitate assembly. The coils are wound on plastic bobbins and the core is placed afterward. The core only handles magnetic flux, so it is the insulation on the wires and the plastic bobbin that is subjected to voltage.