MembersPage/DamirMuha/LowZinjectorsFlyback (2010-04-11 12:57:39)

With this solution you can fast open low z injectors and fast close(30V flyback) but with 25% pwm(low energy losses on flyback transistor). Hold time is 1ms.

Schematic:

7053370240_large.jpg

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.