12V to 700v

[jeep6789]

Metal pipes have water heat dissipation, so there is no need to consider excessive temperature

[Detectorist#1]

but what about excessive pressure inside?

[Detectorist#1]

and how you imagine the size and the shape of 150W transformer in 20mm tube?

[jeep6789]

but what about excessive pressure inside?

I will send you a private message, please check

[Detectorist#1]

O.K.

[Detectorist#1]

E42 ferrite case in 20mm tube, how this is possible?

[Olly]

Perhaps you could give us some further info on your requirements ?
Does the output need to be isolated from the input ?
How much ripple on the output is acceptable ?
Where is your 12V originating from ?

[Detectorist#1]

Very good questions Olly! Maybe this project is in very raw stage.

[jeep6789]

Perhaps you could give us some further info on your requirements ?
Does the output need to be isolated from the input ?
How much ripple on the output is acceptable ?
Where is your 12V originating from ?

Input and output need to be isolated with a transformer, 12v from the battery pack, do not consider the ripple problem, it is a high-voltage generator

[jeep6789]

To make MOS tubes and transformers work at their limits,

[jeep6789]

In order to reduce the volume, we must choose a high-current, low-internal resistance mos tube, as well as a highly efficient transformer core, the operating frequency can not be too high, can not exceed 35khz,

[Olly]

Given your requirements for isolation and low operating frequency of only 35kHz, I'm extremely doubtful that it would be possible to design a 300W converter which will fit into the small space that you have available.

[Detectorist#1]

Hi Olly,
It is very clear that jeep6789 is too young in electronics - that's way hi needs a help in this serious project.

[jeep6789]

yes

[jeep6789]

If you do not isolate, or do not limit the frequency, can the purpose be achieved?