push pull circuit with step up transformer will be the most successful approach...
Possible in principle but inefficient. You get very high primary peak currents, need a high voltage primary switch and get respective high switching losses. A possible compromise could be a moderate primary peak voltage, e.g. 500 V and a cascade rectifier. But flyback transformer topology is clearly preferred.i want to make without transformer...using inductor and capacitor
A flyback or push-pull Tx solution will be smaller and more efficient than a straight boost approach, and require smaller mosfets... We have done flybacks to 4500VDC out (10W) from a 30VDC source, knowledge of transformer construction is critical to reliability, as is choice of diodes...
Taking a de-fib cap at 50uF and 2300VDC, this is 132 joules, to charge in 7 secs is 19 watts average over the 7 seconds (ignoring in-inefficiencies) this is about 2A average from your battery over the 7 seconds.
Larger de-fib caps and larger Joule requirements, require more power and hence current from your 12V battery,
500J needs 7.6A from your batt (average) over 7 seconds...
A well designed flyback with say four outputs in series (each 575V) would do the job, a std 500V 20A mosfet would be a suitable choice for the main fet, you could have a fixed duty cycle or peak current limit turn off to control the charging with a terminating volt control.
We did a similar unit for firing explosive charges over very long lines from a low power NiCad battery source.
As per FvM a straight boost is not a viable solution.
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