MembersPage/DamirMuha/LowZinjectorsFlyback (2010-02-19 22:44:38)

With this solution you can fast open low z injectors and fast close(30V flyback) but with 30% pwm(low energy losses on flyback transistor).

Schematic:

7053370240_large.jpg

mcell9 yes, the sch on your wiki page is drawn in a confusing way

mwfire i have pcb for smd componets (1206)

mwfire but pcb is trial to made new

Same schematic, but drawn in a slightly confusing way:

flybackln2.jpg

When pwm last, flyback voltage is 0.3-1.5V(depending of schottky diode and mosfet(irf9540))

voltagevs1.jpg

Bad thing is, you must have one of thise flyback for every injector.

PCB

49841.jpg

Assembled board(missing 2 zener diodes, i bought two too few)

4062.jpg

That board was tested on lpg injectors(landi renzo, 0.9ohm) and working well.