J.F wrote:

> Godne przemyslenia i moze opatentowania potem ... ale IMHO nie -
> przypominaloby to wyciaganie sie z bagna za wlosy :-)

Behold!

Version 4
SHEET 1 1232 680
WIRE 496 -176 192 -176
WIRE 192 -80 192 -176
WIRE 496 -64 496 -176
WIRE 48 0 0 0
WIRE 144 0 128 0
WIRE 0 16 0 0
WIRE -240 112 -304 112
WIRE -128 112 -160 112
WIRE 0 112 0 96
WIRE 0 112 -48 112
WIRE 192 112 192 16
WIRE 192 112 0 112
WIRE 224 112 192 112
WIRE 336 112 304 112
WIRE 496 112 496 0
WIRE 496 112 416 112
WIRE -304 128 -304 112
WIRE 720 160 720 112
WIRE 912 160 720 160
WIRE 192 192 192 112
WIRE 720 192 720 160
WIRE 912 192 912 160
WIRE 496 208 496 112
WIRE -304 224 -304 208
WIRE 48 272 0 272
WIRE 144 272 128 272
WIRE 0 288 0 272
WIRE 192 304 192 288
WIRE 496 304 496 272
WIRE 720 304 720 272
WIRE 912 304 912 272
WIRE 0 384 0 368
FLAG 192 304 0
FLAG -304 224 0
FLAG 496 304 0
FLAG 0 384 0
FLAG 720 304 0
FLAG 912 304 0
FLAG 720 112 V_SEC
SYMBOL nmos 144 -80 R0
SYMATTR InstName M2
SYMATTR Value BSC100N03LS
SYMBOL res -144 96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 1m
SYMBOL voltage -304 112 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value {V_IN}
SYMBOL ind -144 128 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value {L_BOOST}
SYMBOL cap 480 -64 R0
SYMATTR InstName C1
SYMATTR Value {C_HB}
SYMBOL cap 480 208 R0
SYMATTR InstName C2
SYMATTR Value {C_HB}
SYMBOL nmos 144 192 R0
SYMATTR InstName M1
SYMATTR Value BSC100N03LS
SYMBOL voltage 0 272 R0
WINDOW 0 -53 5 Left 2
WINDOW 3 36 227 Left 2
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value PULSE(0 {V_GATE_ON} 0 {T_RISE} {T_FALL} {T_ON} {T_PERIOD})
SYMBOL res 144 256 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 -55 68 VTop 2
SYMATTR InstName R2
SYMATTR Value {R_GATE}
SYMBOL voltage 0 0 R0
WINDOW 0 -41 -15 Left 2
WINDOW 3 35 457 Left 2
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value PULSE(0 {V_GATE_ON} {T_PERIOD/2} {T_RISE} {T_FALL} {T_ON}
{T_PERIOD})
SYMBOL res 144 -16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 -53 67 VTop 2
SYMATTR InstName R3
SYMATTR Value {R_GATE}
SYMBOL ind 208 128 R270
WINDOW 0 34 27 VTop 2
WINDOW 3 89 69 VBottom 2
SYMATTR InstName L2
SYMATTR Value {LK_PRI}
SYMBOL ind2 320 128 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 88 100 VBottom 2
SYMATTR InstName L3
SYMATTR Value {LM_PRI}
SYMATTR Type ind
SYMBOL ind2 736 176 M0
WINDOW 0 -34 44 Left 2
WINDOW 3 -124 77 Left 2
SYMATTR InstName L4
SYMATTR Value {LM_SEC}
SYMATTR Type ind
SYMBOL res 896 176 R0
SYMATTR InstName R4
SYMATTR Value 100
TEXT 240 -496 Left 2 !.param C_HB=22u
TEXT 240 -432 Left 2 !.param F_OSC=300k
TEXT 240 -400 Left 2 !.param T_PERIOD={1/F_OSC}
TEXT 240 -368 Left 2 !.param T_DEAD=50n
TEXT 240 -336 Left 2 !.param T_RISE=10n
TEXT 240 -304 Left 2 !.param T_FALL=10n
TEXT 240 -272 Left 2 !.param T_ON={T_PERIOD/2 - T_DEAD}
TEXT -10 536 Left 2 !.tran 10m
TEXT 240 -528 Left 2 !.param L_BOOST=22u
TEXT 240 -240 Left 2 !.param V_GATE_ON=10V
TEXT 240 -464 Left 2 !.param R_GATE=1
TEXT -16 456 Left 2 ;V3=
TEXT -16 496 Left 2 ;V2=
TEXT 736 -376 Left 2 !.param LK_PRI=5u
TEXT 736 -536 Left 2 !.param N_PRI=12
TEXT 736 -472 Left 2 !.param AL=5000
TEXT 736 -440 Left 2 !.param LM_PRI={N_PRI*N_PRI*AL/1e9}
TEXT 736 -408 Left 2 !.param LM_SEC={N_SEC*N_SEC*AL/1e9}
TEXT 736 -504 Left 2 !.param N_SEC=12
TEXT 528 136 Left 2 !K1 L3 L4 1
TEXT 240 -560 Left 2 !.param V_IN=9