MembersPage/DamirMuha/LowZinjectorsFlyback (2010-04-17 11:36:12)

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.


Hi,

could you please share the LPG injector setting you used?

What is the max output these can handle?

Whats the minimum opening time?Whats the max allowed Duty?

Thanks,

Peter